34th Annual Symposium of the Hellenic Nuclear Physics Society, HNPS2026

Session

Nuclear Structure: Models and Methods

5 Jun 2026, 10:15

Library Amphitheatre (Lamia, University of Thessaly, Physics Department)

Conveners

Nuclear Structure: Models and Methods

• D. Vretenar

23. The B4/2 anomaly: Observation and theoretical interpretation

Dennis Bonatsos (Institute of Nuclear and Particle Physics, NCSR Demokritos, Athens, Greece)

05/06/2026, 10:15

Talk

emphasized textThe term $B_{4/2}$ anomaly is used in relation to even-even nuclei in which the ratio of the B(E2) transition rates $B_{4/2} = B(E2; 4_1^+\to 2_1^+)/ B(E2; 2_1^+\to 0_1^+)$ is less than unity, a value contrary to the predictions of all collective models. A few experimental examples have been found over the last years, the best known ones being $^{166}$W [1], $^{168,170}$Os...

18. Evidence of triaxiality in Mo and Ru nuclei

Dimitrios Petrellis (Aristotle University of Thessaloniki)

05/06/2026, 10:30

Talk

In the present work [1] we investigate the presence of triaxial deformation in Mo and Ru isotopes. We present experimental indicators of triaxiality and address the distinction between the two extremes of $\gamma$-soft [2] and $\gamma$-rigid [3] triaxial behavior. Quantitative results for the nuclei under study are obtained by means of the Algebraic Collective Model [4], as well as...

63. High-K isomers in the N \approx 116 shape-transition region and in oblate nuclei within the Relativistic Hartree-Bogoliubov theory

Konstantinos Karakatsanis (Institute of Nuclear and Particle Physics, NCSR Demokritos, Athens, Greece)

05/06/2026, 10:45

Talk

K-isomers are metastable nuclear excitations of predominant single-particle character, arising in well-deformed nuclei where the projection of the total angular momentum onto the symmetry axis, K, is an approximately good quantum number. When quasiparticles align their angular momentum projections along the symmetry axis, the resulting multi-quasiparticle configuration acquires a large K...

41. Exploring Triaxial Features in Quadrupole Collective Bands of Even-Even Yb Isotopes

Polytimos Vasileiou (Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH))

05/06/2026, 11:00

Talk

Following a number of successful applications to the neighboring rare-earth isotopic chains, this work employs an IBM-1 Hamiltonian derived from self-consistent mean-field calculations, incorporating intrinsic triaxial deformation obtained from fermionic proxy-SU(3) irreducible representations (irreps), to investigate energy spectra and B(E2) transition strengths in the low-lying quadrupole...

64. Ground-state properties of finite nuclei with astrophysical interest in extreme magnetic fields, via covariant density functional theory

Ioannis Mavroudis (Department of Physics, Aristotle University of Thessaloniki)

05/06/2026, 11:15

Talk

Magnetars and the environments of core-collapse supernovae host some of the most extreme magnetic fields in the universe, reaching intensities of $10^{18}$ G. Under these conditions, the fundamental quantum structure of matter is severely altered. In this work, we investigate the ground-state properties of finite nuclei of astrophysical interest, specifically focusing on waiting-point nuclei...

39. Physics-Informed Neural Networks for Solving the Three-Dimensional Schrödinger Equation in Woods–Saxon Nuclear Potential

Mr Iraklis Spyrou (NCSR DEMOKRITOS)

05/06/2026, 11:30

Talk

Physics-Informed Neural Networks (PINNs) provide a flexible framework for solving differential equations by embedding the governing physical laws directly into the training process. In this work, we investigate the use of PINNs for the solution of the three-dimensional time-independent Schrödinger equation in spherical coordinates, focusing on nuclear single-particle states described by...