Published in
American Physical Society, Physical Review Letters, 4(113)
DOI: 10.1103/physrevlett.113.042502
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Monopole-Driven Shell Evolution below the Doubly Magic Nucleus Sn132 Explored with the Long-Lived Isomer in Pd126
,
T. Sumikama,
P.-A. Söderström,
P. Doornenbal,
F. Browne,
Z. Li,
G. Gey,
H. S. Jung,
J. Taprogge ,
Z.-S. Vajta
and other authors.
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Abstract
A new isomer with a half-life of 23.0(8) ms has been identified at 2406 keV in ^{126}Pd and is proposed to have a spin and parity of 10^{+} with a maximally aligned configuration comprising two neutron holes in the 1h_{11/2} orbit. In addition to an internal-decay branch through a hindered electric octupole transition, β decay from the long-lived isomer was observed to populate excited states at high spins in ^{126}Ag. The smaller energy difference between the 10^{+} and 7^{-} isomers in ^{126}Pd than in the heavier N=80 isotones can be interpreted as being ascribed to the monopole shift of the 1h_{11/2} neutron orbit. The effects of the monopole interaction on the evolution of single-neutron energies below ^{132}Sn are discussed in terms of the central and tensor forces.