PLATAN 2024 - Merger of the Poznan Meeting on Lasers and Trapping Devices in Atomic Nuclei Research and the International Conference on Laser Probing

Session

Plenary

2

10 Jun 2024, 09:00

A102 (Agora, University of Jyväskylä, Finland)

Conveners

Plenary: 1

• Paul Campbell

Plenary: 2

• Michael Block

Plenary: 3

• Tommi Eronen

Plenary: 4

• Shuichi HASEGAWA (The University of Tokyo)

Plenary: 5

• Iain Moore

Plenary: 6

• Ari Jokinen (University of Jyvaskyla (FI))

Plenary: 7

• Daniel Rodríguez (Universidad de Granada)

Plenary: 8

• Magdalena Kowalska (CERN)

Plenary: 9

• Thomas Elias Cocolios (KU Leuven - IKS)

Plenary: 10

• Jens Lassen

Plenary: 11

• Piet Van Duppen (KU Leuven (BE))

Plenary: 12

• Anu Kankainen (University of Jyväskylä)

Plenary: 13

• Klaus Wendt

Plenary: Plenary 14

• Klaus Wendt

Plenary: 15

• Mikael Reponen (University of Jyvaskyla (FI))

Plenary: 16

• Anna Kwiatkowski

100. Laser Spectoscopy of $^{208}$Bi$^{82+}$ at the Experimental Storage Ring ESR

Wilfried Nörtershäuser (Technische Universität Darmstadt (DE))

10/06/2024, 09:00

Invited Presentation

Laser spectroscopy of highly charged ions at the Experimental Storage Ring (ESR) at GSI has a long tradition and started in 1994 with the observation of the hyperfine transition in $^{209}$Bi$^{82+}$ [1]. While carried out to test QED in the strongest magnetic fields available in the laboratory, it turned out that uncertainties in the nuclear structure contributions, specificially the nuclear...

164. Two-body currents in magnetic dipole moments based on nuclear DFT

10/06/2024, 09:30

Oral Presentation

The electromagnetic (EM) moments and transitions in atomic nuclei provide fundamental insights into the nuclear structure and great progress has been achieved in past decades. However, the experimental deviation on EM moments and the 50-year-old quenching puzzle of beta decays indicate the impact of many-body contributions to the EM structure is non-negligible.
In recent years, the ab-initio...

139. High-precision laser spectroscopy of helium-like carbon

Phillip Imgram (KU Leuven (BE))

10/06/2024, 09:50

Oral Presentation

The nuclear charge radius is a key observable in nuclear structure studies. Using the Collinear Apparatus for Laser Spectroscopy and Applied Physics (COALA) at the Institute of Nuclear Physics of TU Darmstadt, an all-optical approach for the nuclear charge radius determination was tested with the well-known nucleus of $^{12}$C. Here, the nuclear charge radius of $^{12}$C was extracted purely...

162. Nuclear structure of Pd isotopes via optical spectroscopy

Sarina Geldhof (GANIL)

10/06/2024, 10:10

Oral Presentation

High-resolution laser spectroscopy is a powerful tool to extract nuclear structure data in a nuclear-model-independent manner. The isotope shift gives direct access to changes in mean-square charge radii, while the extracted hyperfine parameters give access to the nuclear spin, magnetic dipole and electric quadrupole moment. All this provides information on e.g. deformation, shape coexistence...

181. Latest results from LEBIT and upgrades to the stopped beam facilities at FRIB

Ryan Ringle (Facility for Rare Isotope Beams/Michigan State University)

10/06/2024, 11:00

Invited Presentation

The Low-Energy Beam and Ion Trap (LEBIT) facility [1] at the recently commissioned Facility for Rare Isotope Beams (FRIB) remains the only facility that employs Penning trap mass spectrometry for high-precision mass measurements of rare isotopes produced via projectile fragmentation. This powerful combination of a fast, chemically insensitive rare isotope production method with a...

83. Shape Coexistence Near Doubly-Magic $^{78}$Ni

Lukas Nies (CERN)

10/06/2024, 11:30

Oral Presentation

Investigating nuclear structure, especially nuclear shells and their associated magic numbers, has been an important field of research in the last decades. Such proton and neutron numbers are associated with sudden changes in nuclear observables between neighboring isotopes, such as binding energies, charge radii, transition strengths, etc. With $N=50$ neutrons and $Z=28$ protons, the...

84. Recent mass measurements of neutron-rich rare-earth nuclides with the JYFLTRAP double Penning Trap at IGISOL for the astrophysical r-process

Arthur Jaries (University of Jyväskylä)

10/06/2024, 11:50

Oral Presentation

High precision atomic mass spectrometry of neutron-rich rare-earth nuclides near A$\sim$165 was performed recently with the JYFLTRAP double Penning trap [1] using the phase-imaging ion cyclotron resonance technique [2] at the IGISOL facility in the JYFL Accelerator Laboratory. Altogether eighteen masses accross the lanthanum, terbium, dysprosium and holmium isotopic chains were measured,...

119. Pushing the Limits of Ab-Initio Theory through Precision Mass Measurements of Neutron Rich Potassium at TITAN

Coulter Walls (University of Manitoba)

10/06/2024, 12:10

Oral Presentation

TRIUMF's Ion Trap for Atomic and Nuclear science (TITAN) is a set of connected ion traps for rare isotope science. TITAN operates a Multi-Reflection Time-Of-Flight Mass Spectrometer (MR-TOF-MS) primarily for nuclear mass measurements and isomerically selective ion beam cleaning. TITAN's MR-TOF-MS has demonstrated excellent dynamic range ($\sim10^8$), high-precision ($\frac{\delta m}{m} \sim...

108. Progress towards atomic parity violation measurements in francium

Prof. Gerald Gwinner (University of Manitoba)

10/06/2024, 14:00

Invited Presentation

Low-energy precision tests of electro-weak physics keep playing an essential role in the search for new physics beyond the Standard Model. Atomic parity violation (APV) experiments measure the strength of highly forbidden atomic transitions induced by the exchange of Z bosons between electrons and quarks in heavy atoms. APV is sensitive to additional interactions such as leptoquarks, and...

80. Parity-Violating Nuclear Effects From Single Molecules In A Penning Trap

Dr Jonas Karthein (Massachusetts Inst. of Technology (US))

10/06/2024, 14:30

Oral Presentation

This contribution will introduce a new experiment at MIT in which ion trapping and laser spectroscopy techniques are combined for precision measurements of fundamental symmetries and yet-to-be-explored nuclear electroweak properties[ [arXiv:2310.11192]][1]. In particular, single trapped molecular ions can amplify the sensitivity to nuclear-spin-dependent parity-violating effects, such as the...

129. Measurement of Analog-Antianalog Isospin Mixing in $^{47}$K Beta Decay

Dr Brian Kootte (TRIUMF)

10/06/2024, 14:50

Oral Presentation

While both Charge-Parity (CP) symmetry, and more recently Time (T) symmetry have been directly shown to be violated in the weak interaction, it remains an open question whether new sources of CP violation could explain the matter-antimatter asymmetry in the universe. TRIUMF’s Neutral Atom Trap (TRINAT) is equipped to study the angular distribution of all decay products from spin-polarized beta...

82. Current status of MORA at IGISOL

Luis Miguel Motilla Martinez

10/06/2024, 15:10

Poster Presentation

Around us we see an universe filled with galaxies, stars and planets like ours. But when we look back to the Big Bang and the processes that created the matter in it, at first we observe that there should have been created the same amount of matter and antimatter, thus the universe would be empty or different than it is. Sakharov suggested several conditions to explain the matter-antimatter...

173. Present status and future prospects of SCRIT electron scattering facility

暁 塚田 (ICR, Kyoto University)

10/06/2024, 16:00

Invited Presentation

The world's first electron scattering off online-produced Radioisotope (RI) was successfully conducted at the SCRIT (Self-Confining RI Ion Target) electron scattering facility in RIKEN RI Beam Factory in Japan.
Electron scattering stands out as one of the most potent and reliable tools for investigating the structure of atomic nuclei, owing to the well-understood mechanism of electromagnetic...

111. Noble Gas measurements of nuclear fuel particles from Chernobyl

Laura Leifermann (Leibniz Universität Hannover, IRS)

10/06/2024, 16:30

Oral Presentation

During the Chernobyl reactor accident on April 26, 1986, radioactivity was in part released in the form of nuclear fuel particles. These so-called “hot particles” have various structures that belong to specific oxidation states of uranium. These oxidation states behave differently in the environment. We obtain individual particles by density separation with a poly tungsten solution. Via...

150. Development of mid-infrared cavity ring-down spectrometers for radiocarbon/tritium analysis in biomedical tracer and environmental applications

Prof. Hideki Tomita (Nagoya University)

10/06/2024, 16:50

Oral Presentation

The long-lived radioactive carbon isotope ¹⁴C is widely used as a tracer in environmental and biomedical studies. We have developed a ¹⁴C analytical system based on highly sensitive cavity-enhanced laser absorption spectroscopy, i.e., cavity ring-down spectroscopy (CRDS), and demonstrated ¹⁴C tracer analysis in pharmacokinetics and other areas. In parallel with...

144. Elemental ratios of spent nuclear fuel by resonance ionization mass spectrometry

Manuel Raiwa (LLNL)

10/06/2024, 17:10

Oral Presentation

In recent years resonance ionization mass spectrometry (RIMS) has shown great progress in analyzing individual micrometer-sized samples. Selective laser ionization of elements resolves most of the abundant isobaric interferences in complex matrices, like spent nuclear fuel. In RIMS, laser light is aimed at a neutral atomic cloud sputtered from the sample surface by a pulsed primary ion source...

98. Electronic Bridge schemes in $^{229}$Th doped LiCAF

Tobias Kirschbaum (Julius-Maximilians-Universität Würzburg)

11/06/2024, 09:00

Invited Presentation

The thorium isotope $^{229}$Th has attracted a lot of interest over the past few decades. This is related to its extremely low-lying first excited state at $\sim$ 8 eV and long radiative lifetime of a few $10^{3} \, \mathrm{s}$ [1]. This makes $^{229}$Th an ideal candidate for a nuclear clock with outstanding properties promising a variety of applications [2].

Large band gap crystals such...

99. Laser ionization of thorium via Rydberg states in hypersonic gas jets

Arno Claessens

11/06/2024, 09:30

Oral Presentation

Using efficient laser ionization schemes is a key element when performing atom-at-a-time laser spectroscopy. Auto-ionizing states are often used to enhance ionization due to their higher cross sections compared to excitation directly to the continuum. Nonetheless, for certain elements, either such structures are absent or remain undiscovered [1]. Alternatively, another approach involves...

87. Collinear laser spectroscopy of U isotopes at IGISOL

Andrea Raggio (University of Jyväskylä)

11/06/2024, 09:50

Oral Presentation

Actinide elements present a rich spectrum of nuclear structure phenomena, and have been the focus of many research programs aimed at developing a detailed picture of this region of the nuclear chart. For example, theoretical models have predicted the emergence of pronounced reflection-asymmetric shapes moving towards more neutron-deficient isotopes[1]. The region also hosts two unique...

156. Nuclear octupole shapes in Actinides with Fayans functionals

Gauthier Danneaux (Department of Physics, University of Jyväskylä, Jyväskylä, Finland)

11/06/2024, 10:10

Oral Presentation

Static octupole deformation, also called reflection asymmetric by contrast with the quadrupole deformation, displays a profound signature on the observables and systematics of the nuclear ground state $[1]$ and are expected to manifest mostly in the heavier Actinides region of the nuclear chart. Such deformations present a non-negligible impact on the excitation spectra and nuclear properties,...

175. Progress at the N=126 factory at ANL

Guy Savard

11/06/2024, 11:00

Invited Presentation

The N=126 factory is a new facility that uses multi-nucleon transfer reactions to create neutron-rich isotopes of the heaviest elements for studies of interest to the formation of the last abundance peak in the r-process. This region of the nuclear chart is difficult to access by standard fragmentation or spallation reactions and as a result has remained mostly unexplored. The nuclei of...

109. In-gas-cell laser ionization spectroscopy of heavy refractory nuclei produced at KISS

Yoshikazu HIRAYAMA (WNSC, KEK)

11/06/2024, 11:30

Oral Presentation

We have developed the KEK Isotope Separation System (KISS) [1] at RIKEN to study the nuclear structure of the nuclei in the vicinity of neutron magic number N = 126 and 238U from the astrophysical interest. These neutron-rich nuclei have been produced by using multinucleon transfer (MNT) reactions [2] with the combinations of the low-energy 136Xe/238U beams and the production targets of W,...

168. Laser-polarised unstable nuclei at ISOLDE

Magdalena Kowalska (CERN)

11/06/2024, 11:50

Oral Presentation

At the VITO beamline at ISOLDE [1], we use optical pumping with tunable lasers to polarise nuclear spins of different short-lived nuclei. We then use the resulting anisotropic emission of beta radiation in a variety of fields, from nuclear structure, via material science, all the way to biology.
Combining optical pumping with beta-decay detected nuclear resonance (beta-NMR) in liquid samples...

86. Spectroscopic opportunities for rare isotopes with the MIRACLS technique and laser cooling

Dr Simon Lechner (CERN)

11/06/2024, 12:10

Oral Presentation

The MIRACLS experiment at ISOLDE/CERN combines the usage of ion traps and lasers to probe exotic radioactive nuclides [1]. In order to increase the sensitivity of fluorescence-based collinear laser spectroscopy (CLS), MIRACLS traps ion bunches in a Multi-Reflection Time of Flight (MR-ToF) device. Hence, the ions are probed multiple times instead of just once. This increases the laser-ion...

172. Laser spectroscopy of the heaviest elements

Sebastian Raeder (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))

11/06/2024, 14:00

Invited Presentation

While nuclear shell effects are responsible for the existence of the heaviest elements, their atomic structure is strongly influenced by relativistic effects that lead to different atomic and chemical properties than their lighter homologs. Here, laser spectroscopy is a powerful tool for revealing fundamental atomic and also nuclear properties, which are reflected as subtle changes in the...

143. Laser Spectroscopy of Californium-253,254

Sebastian Berndt (Johannes Gutenberg Universität Mainz, 55099 Mainz, Germany)

11/06/2024, 14:30

Oral Presentation

The 60-day spontaneously fissioning isotope californium-254 is the most neutron-rich known isotope of this element. Due to its anomalously long half-life, it is predicted to have a particularly high impact on the brightness of electromagnetic transients associated with neutron star mergers on the timescale of 10 to 250 days [Zhu et al., AJL 863, L23 (2018)]. Experimental information on Cf-254...

142. Laser spectroscopy of fermium-255 at the RISIKO mass separator facility

Mr Matou Stemmler (Johannes Gutenberg Universität Mainz, 55099 Mainz, Germany)

11/06/2024, 14:50

Oral Presentation

Laser spectroscopy provides information about the fundamental properties of atomic and nuclear structure of the constituents of matter. Measurements are of general importance all along the nuclear chart but are specifically thrilling for the heavy actinides and superheavy elements, where data is sparse and theoretical descriptions can be tested. For an extensive measurement campaign at the...

157. Fingerprinting heavy elements via Laser Resonance Chromatography: First demonstrations on Lu$^+$

Aayush Arya (Helmholtz-Institut-Mainz / JGU Mainz)

11/06/2024, 15:10

Oral Presentation

Atoms of different elements possess distinct spectra which serve as their fingerprints. Beyond providing information about the internal atomic and nuclear structure, knowledge of their spectra has allowed their identification in extragalactic stars and even neutron star mergers. However, very little is known about elements beyond fermium ($_{100}$Fm), which can only be synthesized in trace...

184. Plans for laser spectroscopy at the proton drip line

Kara Marie Lynch (University of Manchester (GB))

11/06/2024, 16:00

Invited Presentation

At the edges of the nuclear landscape, a rare form of radioactive decay occurs where the nucleus emits a proton. But what is the shape of the nucleus in the moments before it emits a proton? And how does the shape of the nucleus change when the proton becomes unbound? Studying nuclei at the proton drip line with laser spectroscopy may help to provide insights into these questions.

Laser...

146. Implantation of pure Fe-55 into microcalorimeters for activity standardization measurements

Thorben Niemeyer (Johannes Gutenberg University Mainz)

11/06/2024, 16:30

Oral Presentation

Radionuclide metrology techniques, as currently used for activity standardization, show a large variety of measurement uncertainties – from permille accuracy, e.g., for the α-decaying isotope Am-241 (T1/2 = 432 a) up to few percent for Fe-55 (T1/2 = 2.73 a), which decays by electron capture. To reduce such uncertainties, a new standardization technique using direct ion beam implantation of the...

114. Measurement of the shift in the electron affinities of tin isotopes at DESIREE

David Leimbach (Gothenburg University (SE))

11/06/2024, 16:50

Oral Presentation

The electron affinity (EA) is the energy released when an additional electron is bound to a neutral atom, creating a negative ion. Due to a lack of long-range Coulomb attraction, the EA is dominated by electron-electron interactions, making negative ions excellent systems to probe these effects. A particular example is the determination of the specific mass shift, which is of importance when...

185. Laser Probing of Rare Isotopes: Krypton, Radium, and Beyond

Peter Mueller (Argonne National Laboratory)

12/06/2024, 09:00

Invited Presentation

Laser excitation and manipulation techniques offer unique control of an atom’s external and internal degrees of freedom. The species of interest can be selectively captured, cooled, and observed with high signal-to-noise ratio down to the single atom level. Moreover, the atom’s electronic and magnetic state populations can be precisely manipulated and interrogated. Applied in nuclear physics,...

93. Collinear Laser Spectroscopy on Neutron-Deficient Al Isotopes at RISE/ BECOLA

Brooke Rickey (FRIB at MSU)

12/06/2024, 09:30

Oral Presentation

At the BEam COoling LAser spectroscopy (BECOLA) facility at the Facility for Rare Isotope Beams (FRIB), a Resonance Ionization Spectroscopy Experiment (RISE) instrument has been newly commissioned. This addition to the BECOLA facility will allow for laser spectroscopy to be conducted through both collinear fluorescence and resonant ionization methods back to back in the same beamline. The...

148. Collinear laser spectroscopy in neutron-rich Ru

Kristian Koenig (Technische Universitaet Darmstadt (DE))

12/06/2024, 09:50

Oral Presentation

The region of refractory metals below tin exhibits a diverse spectrum of nuclear phenomena, i.e., strong deformations and shape coexistence. Particularly, in the neutron-rich Ru isotopes, there are hints for triaxial ground state deformations. To investigate nuclear ground-state properties of short-lived isotopes with collinear laser spectroscopy, a new collinear setup, ATLANTIS – the Argonne...

151. On the use of charge distribution in nuclei to constrain effective interactions

Karim BENNACEUR

12/06/2024, 10:10

Poster Presentation

The key ingredient for mean-field calculations in nuclear structure is the
effective interaction which models the strong force in the nuclear medium.
Such interactions usually depend on a set of parameters fitted to
properties nuclei and infinite nuclear matter.

These interactions can suffer several limitations and problems. For
example, since they are usually adjusted on properties of...

179. Radioactive molecule spectroscopy towards searches for BSM physics

Michail Athanasakis-Kaklamanakis (Imperial College London)

12/06/2024, 11:00

Invited Presentation

Molecules that contain heavy and radioactive nuclei can be highly sensitive to a number of nuclear observables of interest, such as the typically studied nuclear magnetic dipole and electric quadrupole moments, but also symmetry-violating hadronic, leptonic, and nuclear moments.

Precision experiments based on heavy and polar radioactive molecules have been proposed as being potentially the...

137. High accuracy predictions of properties of heavy atoms and molecules and evaluation of uncertainties.

Anastasia Borschevsky

12/06/2024, 11:30

Oral Presentation

Theory can provide important support at all the stages of spectroscopic experiments, from planning the measurements, through extracting the properties of interest from the data, and to the interpretation of the results and their comparison to theoretically predicted values. To be reliable and useful in experimental context, theoretical predictions should be based on high accuracy calculations....

145. Radioactive molecular ion beams at CERN-ISOLDE

Mia Au

12/06/2024, 11:50

Oral Presentation

The ISOLDE facility at CERN provides radioactive ion beams of nuclides produced in reactions between 1.4-GeV protons and thick targets using the Isotope Separation On-Line (ISOL) technique. The formation of volatile molecules has been used as a method to deliver beams of otherwise non-volatile release-limited elements [1-5]. Molecular sideband extraction is also used to improve beam purity....

96. Ultra-trace analysis of radionuclides with laser ionization mass spectrometry

Paul Hanemann

12/06/2024, 12:10

Oral Presentation

Resonant laser secondary neutral mass spectrometry (rL-SNMS) combines the spatial resolution traditional ToF-SIMS with the elemental selectivity of resonant laser ionisation. This quasi non-destructive method is an ideal choice for the analyses of micron sized fragments of nuclear fuel, so called “hot particles” from the Chornobyl exclusion zone [1]. With this method actinides in single...

180. The current status of S3LEB at GANIL

Dr Nathalie LECESNE (GANIL)

13/06/2024, 09:00

Invited Presentation

S3LEB (Super Separator Spectrometer-Low Energy Branch) is a low energy radioactive ion beam facility, which will be employed for the study of exotic nuclei, under commissioning as a part of GANIL-SPIRAL2 facility [1]. High intensity primary beams, delivered by the superconducting LINAC of the SPIRAL2 facility, will allow for increased production rate for nuclear fusion evaporation reaction,...

128. Mass measurements of exotic nuclides in the vicinity of $^{100}$Sn and their implications to nuclear structure

Gabriella Kripkó-Koncz (II. Physikalisches Institut, Justus-Liebig-Universität Gießen, Gießen, Germany)

13/06/2024, 09:30

Oral Presentation

The heavy $N=Z$ nuclei and the nuclei in their vicinity are highly interesting to study; they can provide important insights about nuclear structure, symmetries and interactions and have a high impact in modelling nuclear astrophysics processes ($rp$-process, $\nu p$-process). A few examples of the striking phenomena are the formation of high-spin isomeric states, the direct and/or...

158. MR-ToF mass measurements of the isomeric states in 94Ag produced with a hot cavity at IGISOL

Ville Virtanen (University of Jyvaskyla (FI))

13/06/2024, 09:50

Oral Presentation

The N=Z nucleus 94Ag has intrigued physicists for decades thanks to its unique decay modes, long-living isomeric states, and structure. Most notably, the existence of an elusive two-proton decay channel in its spin 21+ isomeric state has been a subject of debate since its first reports in 2006 [1]. Subsequent investigations of 94Ag have not found evidence of two-proton emission, although other...

102. Optical spectroscopy of the silver isotopic chain

Sonja Kujanpää (University of Jyväskylä)

13/06/2024, 10:10

Oral Presentation

How does the size and deformation of the silver nucleus evolve as a function of neutron number as one moves between two exotic neutron shell closures, N=50 and N=82, and can modern nuclear theoretical methods accurately predict the trends? To address this question, experiments in recent years have been performed at the IGISOL facility using collinear laser spectroscopy [1] and in-source...

133. In search of increasingly exotic nuclides at TITAN

Anna Kwiatkowski

13/06/2024, 11:00

Invited Presentation

As nuclides become increasingly exotic, production yields fall off; contamination increases; and, often the half lives drop. To meet these challenges, developments at the TITAN-TRIUMF facility are continually underway. Its Multi-Reflection Time-Of-Flight (MR-TOF) mass separator has become the preferred tool in probing the limits of radioactive-ion-beam production at TRIUMF via high-precision...

171. Recent mass measurements at ISOLTRAP

Daniel Lange (Max Planck Society (DE))

13/06/2024, 11:30

Oral Presentation

High-precision mass measurements of radioactive ions are used to determine nuclear binding energies, which reflect all forces acting in the nucleus and are used to study among others nuclear structure, nuclear astrophysics, and weak interaction.
For this, the ISOLTRAP mass spectrometer at ISOLDE/CERN [1] uses various ion traps, including a tandem Penning-trap system and a multi-reflection...

166. High-precision Penning-trap mass measurements of heavy and superheavy elements with SHIPTRAP

Dr Manuel J. Gutiérrez (University of Greifswald, Germany / GSI Darmstadt, Germany / Helmholtz Institut Mainz, Germany)

13/06/2024, 11:50

Oral Presentation

Speculation about the existence of elements heavier than uranium started in the late 19^th century [1]. Thanks to an increased understanding of nuclear structure and decades of developments, transuranic and eventually superheavy elements were discovered [2]. The latter owe their existence to nuclear shell effects, which enhance their stability [3]. The strength of these effects can...

165. Penning-trap eigenfrequency measurement using single laser-cooled ions

Dr Joaquín Berrocal (Departamento de Física Atómica, Molecular y Nuclear, Universidad de Granada)

13/06/2024, 12:10

Oral Presentation

A new method for the determination of the eigenfrequencies of laser-cooled ions in a Penning trap has been recently demonstrated. It relies on the measurement of the ion’s motional amplitude using the scattered photons when an internal optical electric dipole transition is addressed by lasers [1]. Compared to other techniques, it is universal regarding the mass-to-charge ratio, it is...

141. LEMING: Towards measuring the gravitational acceleration g of Muonium

Paul Wegmann (ETH Zurich)

13/06/2024, 14:00

Invited Presentation

Muonium (Mu = $\mu^+$ + $e^−$) is a purely leptonic, two-body exotic atom amenable for precision measurements of fundamental constants ($m_\mu$, $\mu_\mu$) and tests of bound state QED. Mu also offers the possibility to directly test the coupling of gravity to second generation elementary (anti)leptons, a system where there are no contributions to the mass by the strong interaction. Hence,...

104. Absolute charge radii measurements of potassium and chlorine

Michael Heines (KU Leuven (BE))

13/06/2024, 14:30

Oral Presentation

Muonic atom spectroscopy is a technique that studies the atomic transitions between levels that are occupied by muons orbiting a nucleus. Due to the heavier mass of muons with respect to that of electrons, its atomic orbitals will be substantially closer to the nucleus. Consequently, the sensitivity to nuclear effects is enhanced. In particular, muonic atoms have an increased sensitivity to...

81. Ultra-cold Cs trap for magnetic octupole moment studies and coherent gamma generation

Wirunchana Rattanasakuldilok

13/06/2024, 14:50

Oral Presentation

The atom-trap facility at the Ion-Guide Isotope Separator On-Line (IGISOL) at the University of Jyväskylä has been developed for cooling and trapping a chain of isotopes and isomers of caesium [1]. This would allow a high-precision spectroscopy from which a nuclear magnetic octupole moment can be deduced, an important parameter which helps validate nuclear theory and reveal insight on the...

163. Towards the study of the Bohr-Weisskopf effect in short lived nuclei using laser-rf double-resonance spectroscopy.

Mark Bissell (CERN)

13/06/2024, 15:40

Oral Presentation

Using convectional collinear laser spectroscopy techniques, the Bohr-Weisskopf effect(BWE) is frequently found to be at a similar level to the experimental uncertainty. Therefore, the study of this effect has been mainly limited to stable isotopes, where higher precision can be obtained. Despite the limited information, this effect could in principle provide significant new information on both...

134. Probing the nuclear magnetic octupole moment of trapped Sr ions

Pierre Lassegues (KU Leuven (BE))

13/06/2024, 16:00

Oral Presentation

At the Institute for Nuclear and Radiation Physics of KU Leuven (IKS) we started a project to measure data on the magnetic octupole moment ($\Omega$) of single valence radioactive nuclei. While currently this observable has only scarcely been measured, and is thus poorly understood, preliminary shell model and Density functional theory (DFT) calculations indicate $\Omega$ may display a strong...

140. CERN-ISOLDE’s new high-resolution laser ion source PI-LIST: Results, characteristics, and developments

Reinhard Heinke (CERN)

14/06/2024, 09:00

Invited Presentation

On-line in-source laser resonance ionization is a highly sensitive tool for nuclear structure investigations [1]. While the efficiency of this technique is unrivaled, the experimental resolution is ultimately limited by Doppler broadening in the hot cavity required to ensure atom volatilization. At typical operation temperatures around 2000 °C, this leads to a several GHz limit, whereas...

78. In-source Laser Spectroscopy Studies of Neutron-rich Thallium at IDS/ RILIS-ISOLDE

Zixuan Yue (University of York (GB))

14/06/2024, 09:30

Oral Presentation

Laser spectroscopy is one of the most powerful tools for studying ground and isomeric state nuclear properties. By observing small changes in atomic transitions, we can deduce the nuclear spin, electromagnetic moments, and changes in mean-square charge radii across long chains of isotopes. This allows us to study how the shapes and the configurations of the nuclei vary along the chain and...

107. On-line resonance ionization laser ion source development at the RAON ISOL facility

Dr Sung Jong Park (Institute for Rare Isotope Science)

14/06/2024, 09:50

Oral Presentation

Resonance ionization laser ion source (RILIS) has been developed as part of the ISOL ion sources at RAON in the Institute for Rare Isotope Science, Korea. The RAON RILIS based on Ti:sapphire lasers has been developed with a long laser beam transport system over 30 m. To develop optimal laser ionization schemes and investigate the RILIS efficiency, an off-line test facility adjacent to the...

160. Double-beta decay Q-value measurements with the JYFLTRAP Penning trap

Jouni Ruotsalainen (University of Jyväskylä)

14/06/2024, 10:10

Oral Presentation

The observation of double-beta decays and double-electron captures have become an important tool in the search for physics beyond the Standard Model (SM). These decays have been proposed to decay by emitting either two neutrinos or no neutrinos. While the two neutrino mode has been observed [1], the proposed neutrinoless decay mode requires the neutrino to be its own antiparticle (a Majorana...

92. High precision decay energy measurements of low Q-value beta decays with JYFLTRAP at IGISOL

Dr zhuang ge (UNIVERSITY OF JYVÄSKYLÄ)

14/06/2024, 11:00

Oral Presentation

High-precision measurements of single β$^{±}$ decays or electron capture (EC) are the most model-independent methods to determine the absolute scale of the (anti)neutrino mass. Decay transitions with the lowest possible Q value are desirable. Currently, only three nuclei with low ground-state-to-ground-state (gs-to-gs) decay Q values are employed for direct neutrino-mass measurements [1-3]....

115. Update on TRIUMF's resonant ionization laser ion source(s) and the nuclear spin polarized beams program

Jens Lassen

14/06/2024, 11:20

Oral Presentation

The laser applications group at TRIUMF - Canada's particle accelerator centre is tasked to provide clean and intense beams of radioactive isotopes for user experiments. This is done through in-source laser resonance ionization (running a laser ion source or derivatives thereof). Beam delivery activities and highlights of the RIB delivery and development program of the past years will be...

154. Neither last nor least, just LIST – derivatives of a versatile laser ion source and their applications

Klaus Wendt

14/06/2024, 11:40

Oral Presentation

Selective and efficient ionization using multi-step resonant laser excitation processes has become the most versatile and widely used technique in the production and study of exotic species, both for research on their atomic or nuclear structure at the different on-line facilities worldwide as well as for applications in isotope purification for fundamental investigations or for the production...