Band structures in near spherical 138Ce

Electromagnetic transition rates in theN=80nucleus58138Ce

“…2. This is consistent with that reported by Bhattacharjee et al [19]. Relative gammaray intensities have been measured and normalized with respect to the 789 keV (2 + → 0 + ) transition.…”

“…Bhattacharjee et al [19] assigned the I π = 11 + yrast state at an excitation energy of 3942 keV to decay by a mixed (M 1 + E2) multipolarity transition with an energy of 403 keV based on angular distribution measurements. Since the exact value for the mixing ratio is unknown for this transition, the reduced transition probabilities assuming the limiting values of either pure M 1 or pure E2 have been calculated.…”

High-spin spectroscopy ofCe139

“…This was possible based on the following arguments, (i) The 239 keV transition, as well as transitions of band D1 above the level at 5917 keV, are in coincidence with the cascades populated by the 384 keV and the 1108 keV transitions, (ii) The Rdco ratio of the 404 keV transition when gated on an M 1 transition comes out to be 2.02 (30) in the present work, which is therefore compatible with a A I = 2 transition, leading to spin 31/2" for the state at 4808 keV. (iii) The R dco ratio of the 1108 keV transition comes out to be 0.35 (8) in the present work when gated on an E2 transition, which is compatible with a Ml + E2 transition, leading thus to spin 33/2" for the state at 5916.5 keV.…”

“…However, the investigation of these nuclei is very important for the test of the effective interactions used in shell-model calculations and the existence of dipole bands showing magnetic rotation. New experimental data have been recently published for the I37,l38Ce nuclei [7,8] revealing the existence of dipole bands at the highest spins. Results on the 139Ce nucleus were also published recently, but not at high enough spin to possibly observe dipole bands or other collective structures [7][8][9][10].…”

Shell Closure N = 82 nuclei interpretation by the Cranked Nilsson-Strutinsky Model : 136-138Ce

“…The main motivation of these work is to study and investigate the structure of the observed high spin states of [136][137][138] Ce nuclei [5][6][7][8] by suggesting several positive and negative parity configurations with different signatures of the dipole bands on the basis of Cranked Nilsson-Strutinsky (CNS) calculations where we have assigned the configurations having the best agreement with the experimental results of these nuclei.…”