Microscopic description of isoscalar giant monopole resonance: in the case of 118-132Sn
Семинары
Семинар «Ядерная физика низких энергий»
Дата и время: пятница, 4 июня 2021 г., в 14:30
Место: Онлайн-конференция в Zoom, Лаборатория теоретической физики им. Н.Н. Боголюбова
Тема семинара: «Microscopic description of isoscalar giant monopole resonance: in the case of 118-132Sn»
Докладчики: Н. Н. Арсеньев, А. П. Северюхин
Аннотация:
Starting from the quasiparticle random phase approximation based on the Skyrme interaction, we study the effects of phonon-phonon coupling on the monopole strength distributions of neutron-rich tin isotopes.
Using the same set of parameters, we describe available experimental data for 118,120,122,124Sn and give prediction for 132Sn. The effects of the phonon-phonon coupling lead to a redistribution of the main monopole strength to lower energy states and also to higher energy tail. We analyze thoroughly the properties of the low-energy 0+ spectrum of two-phonon excitations of 132Sn. We give prediction for the excitation energy of the lowest two-phonon state around Ex = 8 MeV in comparison to 11.5 MeV in the case of the lowest 0+ state within the random phase approximation.