Systematics of 2_(1)^(+)States in N=82 Even-even Isotones

In this paper,we study the systematics of the 2_(1)^(+)states in the N=82 even-even isotones with proton numbers between 52 and 72.We calculate the level energies of the 0_(1)^(+),2_(1)^(+)states and the electric quadrupole reduced transition probabilities B(E2;2_(1)^(+)→0_(1)^(+)),in the framework of the nuclear shell model with a monopole-and multipole-optimized realistic interaction.Our calculations yield good agreement with the experimental data and show a 2.5 MeV gap at Z=64 subshell closure in^(146)Gd.We predict that the B(E2;2_(1)^(+)→0_(1)^(+))value for^(146)Gd is close to those for^(142)Nd and^(144)Sm,and the values increase rapidly from^(148)Dy to^(152)Yb.

Evolution of intrinsic nuclear structure in medium mass even-even Xenon isotopes from a microscopic perspective

In this study,the multi-quasiparticle triaxial projected shell model(TPSM)is applied to investigateγ-vibrational bands in transitional nuclei of 118-128Xe.We report that each triaxial intrinsic state has aγ-band built on it.The TPSM approach is evaluated by the comparison of TPSM results with available experimental data,which shows a satisfactory agreement.The energy ratios,B(E2)transition rates,and signature splitting of theγ-vibrational band are calculated.

Systematic study of odd-mass^151-161Pm and^154,156Pm isotopes using projected shell model

Inspired by the availability of recent experimental as well as theoretical data on the energy levels of odd-mass^151-161Pm and odd-odd^154,156Pm,we applied the theoretical framework of the projected shell model to further understand the nuclear structure of these nuclei.The calculations closely reproduced the experimental data reported for the yrast bands of these isotopes by assuming an axial(prolate)deformation of^0.3.Other properties along the yrast line,such as transition energies and transition probabilities,have also been discussed.Band diagrams are plotted to understand their intrinsic multi-quasiparticle structure,which turn out to be dominated by 1-quasiparticle bands for the odd-mass Pm isotopes and 2-quasiparticle bands for the doubly-odd Pm isotopes under study.The present study not only confirms the recently reported experimental/theoretical data,but also extends the already available information on the energy levels and adds new information regarding the reduced transition probabilities.

Systematic study of the product((E(2_2^+)/E(2_1^+)) * B(E2)↑) through the asymmetric rotor model

A systematic study of the product（（E（22^＋）/E（21^＋））＊B（E2）↑） is carried out in the major shell space Z=50-82,N=82-126 within the framework of the asymmetric rotor model where the asymmetry parameter γ0reflects change in the nuclear structure.A systematic study of the product（（E（2^＋）/E（2^＋））＊B（E2）↑） with neutron number N is also discussed.The product（（E（22^＋）/E（21^＋））＊B（E2）↑） provides a direct correlation with the asymmetry parameter γ0.The effect of subshells is visible in Ba-Gd nuclei with N 〉 82,but not in Hf-Pt nuclei with N 〉 104.We study,for the first time,the dependency of the product（（E（22^＋）/E（21^＋））＊B（E2）↑） on the asymmetry parameterγ0.