Evolution of collective and noncollective structures in Xe123

Abstract

An experiment involving a heavy-ion induced fusion-evaporation reaction was carried out where high-spin states of 123 Xe were populated in the 80 Se(48 Ca, 5n) 123 Xe reaction at 207 MeV beam energy. Gamma-ray coincidence events were recorded with the Gammmasphere Ge detector array. The previously known level scheme was confirmed and enhanced with the addition of five new band structures and several inter-band transitions. Cranked Nilsson-Strutinsky (CNS) calculations were performed and compared with the experimental results in order to assign configurations to the bands.

Three-quasineutron γ-band in 127Xe

“…A similar configuration is also suggested for the band built on the yrare I π = 27/2 − state at 3619 keV in 125 Xe (marked as band 5 in [26] / band 11a in [52]). States with similar decay patterns are also reported in 123 Xe [25,58]. However, the spectroscopic information on these states in 123 Xe is insufficient and hence demands further experimental investigation.…”

Extended triaxial projected shell model approach for odd-neutron nuclei

“…High-spin states in odd-neutron Xe-isotopes have been investigated by various experimental groups [10,47,48,50,52,53,71], and in some nuclei side bands apart from the yrast states have been populated up to quite high angular momentum. In Figs.…”

“…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].…”

“…Further, it has been observed in the odd-neutron Xeisotopes that the character of the band crossing changes from proton to neutron with increasing mass number [10,50,71,72]. As in the extended model space, both proton and neutron quasiparticle configurations are included, it is possible to investigate the interplay between neutron and proton alignments.…”

Search for the origin of wobbling motion in the A≈130 region: The case of Xe131

“…Being associated with mid/high-configurations, both the α = ±1/2 signature partners of the νh 11/2 band were expected to be observed in these nuclei. Systematically, two I π = 13/2 − states were reported in [119][120][121][122][123][124][125][126][127] Xe [13,[31][32][33][34]. The excitation energies of these I π = 13/2 − and I π = 15/2 − states relative to the energy of I π = 11/2 − state (i.e., E x after subtracting E 11/2 − ) are plotted as a function of mass number in Fig.…”