Conveners
Nuclear and Astro-particle Physics: F1a (Parallel F)
- Veronica Dexheimer
Nuclear and Astro-particle Physics: F1b (Parallel F)
- Anthony Thomas
Nuclear and Astro-particle Physics: F2a
- Wally Melnitchouk (Jefferson Lab)
Nuclear and Astro-particle Physics: F2b (Parallel F)
- Pia Jakobus (Hamburg Observatory)
Nuclear and Astro-particle Physics: F3a (Parallel F)
- ALESSANDRO STRUMIA
Nuclear and Astro-particle Physics: F3b (Parallel F)
- Paul Lasky
Nuclear and Astro-particle Physics: F4a (Parallel F)
- David Blaschke
Nuclear and Astro-particle Physics: F4b (Parallel F)
- Hartmut Abele (TU Wien)
Nuclear and Astro-particle Physics: F4c (Parallel F)
- Alejandro Ayala (Instituto de Ciencias Nucleares, Universidad Nacional Autonoma de Mexico)
We consider the capture of dark matter in neutron stars, and the heating caused by the subsequent thermalization and annihilation of that dark matter. We find that most of the dark matterโs kinetic energy is rapidly deposited in the star. Furthermore, we find that capture-annihilation equilibrium, and hence maximal annihilation heating, can be achieved without complete thermalization of the...
We investigate QCD at large isospin density by computing correlation functions between sources with isospin charge $n=1,\ldots,6144$ on two lattice volumes at quark masses corresponding to a pion mass, $m_\pi\sim170$ MeV. By extracting the energies of the corresponding many-pion systems under the assumption of log-normality of the correlation function distributions, we determine the isospin...
Core-Collapse Supernovae, the explosions of massive stars, are among the several types of gravitational-wave sources yet to be discovered by gravitational wave interferometers. These cataclysmic events may yield insights into the nuclear EoS at multiple times nuclear saturation density. I will review the current advancements in deducing properties of the proto-compact star from gravitational...
The Quark-Meson Coupling (QMC) model describes a self-consistent relationship between the dynamics of the quark structure of a nucleon and the relativistic mean fields arising within the nuclear medium. The model has been successful in computing ground-state observables of finite nuclei and in predicting properties of dense nuclear matter and non-rotating neutron stars. This presentation will...
The results on recent studies of nuclear dynamics at extremely large internal
momenta in the deuteron are presented. We demonstrate that the paradigm shift
in the description of the deuteron consisting of proton and neutron to the description of
the deuteron as a pseudo-vector composite system in which proton and neutron is
observed in high energy electro-disintegration processes...
The newly completed Stawell Underground Physics Laboratory (SUPL) in the Stawell Gold Mine will host rare event physics searches, including the dark matter direct detection experiment SABRE South, as well as low background experiments such as radiobiology and quantum computing. Neutrons present an important background to the experiments within SUPL, their penetrating power and neutral charge...
The low-energy QCD, the theory within the Standard Model describing the strong interaction, is still missing fundamental experimental results to achieve a breakthrough in its understanding. Among these, the low-energy kaon-nucleon/nuclei interaction studies are playing a key-role.
Combining the excellent quality of the low-energy kaon beam delivered by the DA๏NE collider of INFN-LNF with new...
The neutron lifetime anomaly speaks to the possibility of exotic decay channels of the neutron. The very existence of neutron stars constrains the strength of such effects, and in this talk I develop how precisely determined energy-loss constraints, particularly anomalous binary-pulsar period lengthening, limit not only the total baryon loss rate across the star but also the parameters of the...
Neutron star physics has wrestled with the longstanding challenge of the hyperon puzzle, attempting to reconcile lowered theoretical predictions of maximum masses due to hyperons with astrophysical observations based on the measured masses of the heaviest pulsars. Recently, we conducted a comprehensive statistical analysis of equations of state (EoSs) for neutron stars with hyperons, including...
It has been suggested [1] that the observation of pulsars with the same mass but significantly different radii (twin stars) would prove that the existence of a critical endpoint in the QCD phase diagram since this phenomenon requires a strong phase transition in cold neutron star matter.
We explore whether such a phase transition in neutron star cores, possibly coupled with a secondary kick...
Gravitational waves allow us to probe the interiors of both cold and hot neutron stars where potentially exotic states of matter exist. I will review current efforts to observe gravitational waves from merging neutron stars by the LIGO-Virgo-KAGRA collaborations. I will also provide an overview of what this field holds in the next decade with current gravitational-wave observatories, and what...
The nuclear equation of state (EOS) describes varied phenomena, from the distribution of neutrons and protons inside heavy nuclei to the maximum size of neutron stars. The PREX-2 and CREX experiments used parity violating electron scattering to determine the neutral weak form factors for two doubly magic nuclei: 208Pb and 48Ca. These results can be used to cleanly extract a neutron radius and...
we evaluate the energy loss rate of supernovae induced by the axion emission process ๐+๐โ๐+๐ with the ฮ(1232)resonance in the heavy baryon chiral perturbation theory for the first time. Given the axion-nucleon-ฮ interactions, we include the previously ignored ฮ-mediated graphs to the ๐+๐โ๐+๐ process. In particular, the ฮ-mediated diagram can give a resonance contribution to the supernova axion...
In the present work we calculate the transition magnetic moments for the radiative decays of $\Delta $ baryon to $proton$ ($\Delta \rightarrow p$) in isospin asymmetric strange hadronic medium at finite temperature using chiral $SU(3)$ quark mean field model. Within the framework of chiral $SU(3)$ mean field model, the properties of baryons in strange isospin asymmetric medium are modified...
When continuous symmetry is spontaneously broken, the system supports gapless Nambu-Goldstone modes. As a result, the low-energy real-time dynamics are governed by hydrodynamic theory incorporating these Nambu-Goldstone modes. In this talk, I will introduce a general framework for deriving hydrodynamic equations for symmetry-broken phases and discuss their potential application to dense...
Duality between quarks and baryons is the fundamental properties of QCD. We have recently shown in Ref. [1] that the duality is closely tied to Quarkyonic nature of matter at high baryon density. We have formulated a dual model for dense QCD, which allows a thermodynamic description both in terms of baryons or quarks, with the quark confinement relation that sets the transformation between...
We investigate the effects of rotation on deconfinement and chiral phase transitions in the framework of dynamical holographic QCD model. Instead of transforming to the rotating system by Lorentz boost, we construct an anisotropic gravitational background by incorporating the rotating boundary current. We firstly investigate the pure gluon system under rotation to extract deconfinement phase...
Recently, we conducted a kaonic nuclear-bound state search experiment using a K
โ
beam
(1 GeV/c) bombarding a 3He target. We succeeded in observing a kaonic nuclear quasi-bound
state,โKโppโ, via a nucleon knockout reaction, KโN โ K ฬnโฒ, followed by the decay K ฬNN โ ฮp
(2NK ฬA) in the two-nucleon K ฬ absorption process, resulting in the final state ฮp + nโฒ. The result
โ
cay width of...
The enormous density of the nuclear matter at the core of a neutron star (or proto-star) challenges our understanding of the strong interaction. There are convincing arguments that hyperons must play a role, with consequences for the equation of state, the speed of sound and observable properties. It is also possible that confinement breaks down. We will review recent progress on these issues.
Strong magnetic fields impact quantum chromodynamics properties in several situations; examples of situations include the early universe, magnetars, and heavy-ion collisions. All of these examples involve time evolution. In this presentation, I will first present results of a study of the effects of a strong magnetic field on the time evolution of the quark condensate (scalar density) at...
We present a novel resonant spectroscopy technique devoted to the study of gravitation and the related cosmological problems of Dark Matter and Dark Energy. The object is a quantum mechanical wavepacket of an ultra-cold neutron, and the new method extends the techniques of Purcel, Rabi and Ramsey to neutron quantum states in the gravity potential of the Earth. The new technique is named...
It is well known that Dark Matter can be captured and accumulate in celestial objects. While this problem and been studied thoroughly for the Sun and the Earth, recently compact celestial objects like White Dwarfs and Neutron Stars have raised the interest of the scientific community. Here I present two recent results related to these objects.ย
In the case of Neutron Stars, we consider Dark...
Generalised parton distributions promise to expand our understanding of the behaviour of the elementary quarks and gluons into three dimensions. They provide us with a framework for describing the position of the quarks and gluons as well as how they divide the hadronโs momentum between them. This is an exciting research frontier to be investigated at Jefferson Lab as well as the future...
Including the effects of the chiral anomaly within Chiral Perturbation Theory at finite baryon chemical potential, it has been shown that neutral pions form an inhomogeneous phase dubbed the "Chiral Soliton Lattice" (CSL) above a certain critical magnetic field. Above a second, even higher critical field, the CSL becomes unstable to fluctuations of charged pions, implying they condense. I will...
Modern few- and many-body simulations of nuclei rely on precise nuclear forces and electro-weak currents. A powerful tool which makes such high-precision calculations possible without losing connection to Quantum Chromodynamics (QCD), the fundamental theory of the strong interaction, is chiral effective field theory (EFT). Instead of working directly with quarks and gluons it is more efficient...
The SABRE experiment aims to detect an annual rate modulation from dark matter interactions in ultra-high purity NaI(Tl) crystals in order to provide a model independent test of the signal observed by DAMA/LIBRA. It is made up of two separate detectors that rely on joint crystal R&D activity; SABRE South located at the Stawell Underground Physics Laboratory (SUPL), in regional Victoria,...
Two-color ($N_c=2$) QCD world is one of the useful testing grounds to delineate cold and dense QCD matter, since the lattice QCD simulation is straightforwardly applicable thanks to the disappearance of the sign problem. Motivated by recent numerical results from the lattice QCD activities, I am being investigating properties of dense two-color QCD by constructing the linear sigma model (LSM)....
Since the EMC effect indicates modification of quark distribution in the nucleons inside the nucleus, the properties and structure of nucleons might be modified in the nucleus. However, it is still unclear. In order to correctly describe high-density nuclear matter in neutron stars, this problem should be also studied, as well as the nuclear force in dense nuclear matter.
We are planning to...
Neutron scattering off neutron halos can provide important information about the internal structure of nuclei close to the neutron drip line. In this work, we use halo effective field theory to study the $s$-wave scattering of a neutron and the spin-parity $J^P=\frac{1}{2}^+$ one-neutron halo nuclei $^{11}\rm Be$, $^{15}\rm C$, and $^{19}\rm C$ at leading order. In the $J=1$ channel, the only...
Using a confining version of the Nambu-Jona--Lasinio model we present results for the transverse momentum dependent parton distribution functions (TMDs) of the free nucleon and also a nucleon bound in nuclear matter. We study how nuclear medium effects impact quark transverse momentum. Implications for the EMC effect and semi-inclusive deep inelastic experiments on nuclear targets will also be...
We focus on the equation of state in neutron stars with the color molecular dynamics. This is based on the constituent quark model, and reproduces the quark confinement/deconfinement phenomena by solving the color degrees of freedom for each quark. The equation of state for dense matter is studied, and it replicates the saturation properties: symmetric energy, $L$โparameter, and...
We estimate the magnetic moment of electron neutrinos by computing the neutrino chirality flip rate that can occur in the core of a strange quark matter neutron star at birth. We show that this process allows neutrinos to anisotropically escape thus inducing the star kick velocity. The process is not subject to the no-go theorem since, although the flip from left- to right-handed neutrinos...
The strong interaction between a hyperon and a nucleon (YN)
is able to be studied by spectroscopy of hypernuclei,
which are nuclei with a bound hyperon or hyperons.
Hypernuclear spectroscopy at Jefferson Lab in the US
uses an electron scattering to precisely measure
the masses of Lambda hypernuclei.
The resolution and accuracy for the mass measurement
are 0.6 (FWHM) and <0.1 MeV,...
We study the space-time evolution of electromagnetic fields along with the azimuthal fluctuations of these fields and their correlation with the initial matter geometry specified by the participant plane in the presence of finite electric (ฯ ) and chiral magnetic (ฯฯ ) conductivities in Ru + Ru and Zr + Zr collisions at โsNN = 200 GeV. We observe the partially asymmetric behavior of the...
The Compton amplitude subtraction function holds considerable phenomenological significance, evidenced by its role in the determination of such quantities as the proton-neutron mass difference. However, the subtraction function cannot be measured directly in experiments. While the subtraction function can be evaluated theoretically in the low-energy region using effective field theory, and in...
This research first explores advancements in nearest neighbor methods tailored for $f$-divergence estimation and the mitigation of biases induced by high-dimensional data. Nonparametric methods, including nearest neighbor and kernel techniques, are recognized for their simplicity and scalability, allowing for parallel computation without extensive model tuning. Despite their advantages, these...
