Prolate and oblate 10+ isomers in 140Sm78 and 142Gd78

Excited states in the141Gd nucleus

“…1 The ground state (1/2 + ) and the low lying levels in 14iGd are mainly of single particle character involving one neutron hole excitations in the 3sl/2, 2da/2 and lhll/2 orbitals. We observed above the 11/2-state a level sequence with AI=2 (15/2, 19/2, 23/2) with spacings similar to the ones observed in the ground state band of the core X42Gd nucleus [5]. Therefore they can be interpreted as the fully aligned members of the multiplet resulting from the coupling of the hli/2 neutron hole to the 2 +, 4 + and 6 + core excitations.…”

High-spin levels in the odd-odd nucleus142Eu

“…The third 7 ray cascade, which feeds the 1397 keV level, is characterized by angular distributions peaking at 0 ~ The 8-isomer of 142Eu , from the allowed GamowTeller decay (logft = 5.2 [4] , not far from those of other E1 transitions in this nuclear region [5]. The excitation energies, relative to the 10 + level, of the 12 + and 14 + states belonging to the main cascade (722 keV and 1753 keV, respectively) are very close to those of the 2 + and 4 + excitations of the N = 80 142Sm core [4], and also to those of the 12 + (3729 keV) and 14 + (4779 keV) levels of 142Gd with respect to the 10 + (3137 keV) state [7]. These two states (and also the 11 + at 795 keV and the 13 + at 1667 keV) can therefore be explained as core excitations built on states of single -particle character.…”

High-spin structures in Xe132 and Xe133 and evidence for isomers along the NVogt1, Siciliano2, Birkenbach3 et al. 2017Phys. Rev. CSelf Cite122120View full textAdd to dashboardCite

“…The states are interpreted as fully aligned νh −2 11/2 two-neutron hole configurations. A decreasing trend in lifetimes is observed with increasing proton number Z [12,[16][17][18][19][20][21][22]. Compared to the other N = 78 isotones, the yrast 10 + 1 state in 132 Xe has an exceptionally long half-life of T 1/2 = 8.39 (11) ms [23] and decays predominantly via an 538-keV E3 γ ray to the (7 − 1 ) state, whereas the location of the 8 + 1 state in the level scheme is still unknown [8].…”