Nuclear structure in odd-odd nucleus 138Pr

Abstract

With the view of extending the systematics of odd-odd Pr nuclei toward the N=82 closed shell, high-spin states in ~38Pr nucleus have been investigated with the *2STe(~N ~4nu reaction.Configurations and spin assignments are suggested for three of the observed bandstructures.

High-spin states and collective oblate bands in the odd-oddPr138nucleus

“…[20,21] were confirmed in the present work. Moreover, we add 14 new levels and 25 new γ transitions to the scheme, comparing our results to those reported in Ref.…”

“…The lowest state in Fig. 1 is a first isomeric state (T 1/2 = 2.12 h) at 364 keV with I π = 7 − [19][20][21] and the I π of 563-keV level is assigned as 8 − , which is consistent with that in Ref. [21].…”

“…The spin and parity (I π ) assignments for some levels are based on the previous works [19][20][21], the DCO ratios, and the systematical comparison with the levels of neighboring N = 79 isotones 136 La [8] and 140 Pm [23]. Table I shows the observed DCO ratios for some γ -transitions of 138 Pr in the present work.…”

“…In the previous works, for the odd-odd Pr isotopes, the high-spin structures in 134 Pr [17] and 136 Pr [18] have been studied in detail. For the 138 Pr nucleus, the low-spin states have been studied from the β decay [19], and some high-spin levels and band structures were reported using a heavy-ion reaction [20], but one still needs to extend its high-spin states to systematically understand the nuclear structure character of the double-odd nuclei in this region, such as the signature inversion, the band crossing, the oblate * Electronic address: zhushj@mail.tsinghua.edu.cn bands etc.. In this article, we report on experimental research on high-spin states and collective-band structures in 138 Pr in more detail.…”

In-beam study of the doubly-odd nucleus 61 140 Pm79 above the 8− β +-decaying isomer

“…The one starting at 2748 keV shows strong similarity with bands observed in 136pm and ~SSpr nuclei [22,23] attributed to the [41315/2 +@~h21/2@vh~l~2 4-quasiparticle configuration. The negative parity structure starting at 806 keV can be interpreted as a decoupled 11/2-band built on the hll/2 proton orbital as in the case of the N=79 nucleus 13apr [23]. As in that case we prefere for it a gT/2~c [431]l/2+@vh11/2 oblate configuration with a…”