Highly deformed band structures due to core excitations in Xe123

Abstract

High-spin states in 123 Xe were populated in the 80 Se( 48 Ca, 5n) 123 Xe reaction at a beam energy of 207 MeV. Gamma-ray coincidence events were recorded with the Gammasphere spectrometer. Four new high-spin bands have been discovered in this nucleus.The bands are compared with those calculated within the framework of cranked Nilsson-Strutinsky and cranked Nilsson-Strutinsky-Bogoliubov models. It is concluded that the configurations of the bands involve two-proton excitations across the Z = 50 as well as excitation of neutrons across the N = 82 shell gaps resulting in a large deformation, ε2 ∼ 0.30 and γ ∼ 5 • .

Extended triaxial projected shell model approach for odd-neutron nuclei

“…TPSM energies for the lowest bands after configuration mixing are plotted along with the available experimental data for 121,123 Xe isotopes. Data is taken from [8,49].…”

“…In recent years, some major advancements in the spectroscopic techniques has made it feasible to populate the high-spin band structures in atomic nuclei to the extremes of angular-momentum, excitation energy and isospin [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. In some nuclei, the high-spin states have been studied up to angular momentum, I ≈ 60h and as many as twenty side bands have been identified [9][10][11][12]14].…”

“…The band structures in odd-mass Xe-isotopes have been extensively investigated using the state-of-the-art experimental techniques [10,50,71]. In some of these studies, the highspin states have been populated up to spin, I ≈ 55h and also several side bands have been identified [8,10]. The major problem is how to characterise the intrinsic configurations of the observed band structures as single-particle and collective degrees of freedom are interwoven in odd-mass systems.…”