O B A V I J E S T
LUKA LOTINA
održat će znanstveni kolokvij (doktorski seminar) iz Nuklearne fizike tvari pod naslovom
Microscopic description of nuclear deformations
The quadrupole and hexadecapole deformations affect the low-lying positive-parity states in nuclei. While the quadrupole deformations have been extensively studied, much less attention has been paid to hexadecapole deformations, due to the fact that the effects of such deformations are often overshadowed by large quadrupole deformation effects. In this work, a microscopic model is constructed that allows for a theoretical study of axial hexadecapole effects in nuclei. Using the recently developed method of mapping the deformation constrained axially symmetric mean-field energy surfaces onto the Hamiltonian of the sdg interacting boson model, a microscopic calculation of the low-lying excitation energy spectra and transition strengths is performed on even-even rare-earth isotopes of Nd, Sm, Gd, Dy, and Er (Z=60-68), with the neutron number in the range N=84-96. The results are compared with the available experimental data and with a simpler model, the mapped sd interacting boson model, in order to examine the hexadecapole correlation effects in the chosen nuclei. It is shown that the inclusion of hexadecapole collectivity significantly improves the description of ground state band states in nuclei with the neutron number being near the N=82 shell closure. The hexadecapole correlations are also shown to be important in the description of quadrupole transitions in the ground state band, as well as in the description of 4^+ bands with enhanced hexadecapole transitions in strongly deformed nuclei.
Seminar će se održati u četvrtak 21. ožujka 2024. godine u 11:00 sati u predavaonici F-12 Fizičkog odsjeka Prirodoslovno-matematičkog fakulteta Sveučilišta u Zagrebu.
Pozivaju se studenti doktorskog studija Fizike, smjer Nuklearna fizika, da prisustvuju seminaru, ako nisu spriječeni.
Voditelj smjera:
Prof. dr. sc. Damir Bosnar, v. r.
Pristupačnost
