Emerging nuclear collectivity in ^124−130Te

Abstract

The emergence of nuclear collectivity near doubly-magic 132 Sn was explored along the stable, eveneven 124−130 Te isotopes. Preliminary measurements of the B(E2; 4 + 1 → 2 + 1 ) transition strengths are reported from Coulomb excitation experiments primarily aimed at measuring the g factors of the 4 + 1 states. Isotopically enriched Te targets were excited by 198-205 MeV 58 Ni beams. A comparison of transition strengths obtained is made to large-scale shell-model calculations with successes and limitations discussed.

Spectroscopy and lifetime measurements in Te134,136,138 isotopes and implications for the nuclear structure beyond N=82Häfner1, Lozeva2, Naïdja3 et al. 2021Phys. Rev. C123180View full textAdd to dashboardCite

“…According to the range set for 132 Te [14,70] 2 ) states (whenever known) for even-even Te isotopes around the semimagic N = 82. Experimental B(E 2) values for N < 82 are taken from the latest literature [5,49,71,72] and ENSDF [55, 73,74]). Values of this work (empty symbols) are given to expand the experimental systematics (in the inset) and compared to the latest known (filled symbols) literature for N 82 [2,9,14,[21][22][23]49,53] and ENSDF [45][46][47].…”

“…13(c) the B(E 2) transition rates from this work (shown with empty symbols) are appended to those known previously (shown with filled symbols) either to show the systematics (in the inset) or compare to the previously known results for the nuclei of interest. Literature values for N < 82 are taken from the newest available data [5,49,71,72] and data evaluation [55, 73,74] (see also Table III). For the nuclei of interest in this measurement with N 82, except latest evaluation [45][46][47] and the available literature values [2,9,14,[21][22][23]49,53], the experimental results are compared to our shellmodel values [shown in Fig.…”

Lifetimes and transition probabilities for low-lying yrast levels in Te130,132

“…The new results obtained in the present work for the 2 + 1 and 4 + 1 levels in 130,132 Te are compared with the existing data on measured lifetimes [25][26][27] the lifetime data for the 4 + 1 level in 130,132 Te are obtained for the first time in the present work except an upper limit of lifetime for the 4 + 1 level in 132 Te is known from a preliminary measurement with centroid difference technique [27]. In addition, the lifetimes for the 2 + 1 and 4 + 1 levels of 130,132 Te could also be deduced from the B(E 2) values obtained in Coulomb excitation measurements [28][29][30]. The lifetimes of these levels, so obtained, come out to be 3.…”

Table of electronic factors for E0 electron and electron–positron pair conversion transitions

“…Other parameters to deduce the total EM radiation intensity de-exciting the 966.13 keV level, I tot , were taken from Table F. The level half-life of T 1/2 = 2.4 +17 −7 ps is very asymmetric, therefore a Monte-Carlo uncertainty propagation program [67] was used to evaluate the mean value and asymmetric uncertainties from the probability density function (PDF) of ρ 2 (E0) shown in Fig. 5.…”