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Monopole-driven shell evolution below the doubly magic nucleus Sn 132 explored with the long-lived isomer in Pd 126

AuthorsWatanabe, H.; Lorusso, G.; Nishimura, S.; Otsuka, T.; Ogawa, K.; Taprogge, J. ; Jungclaus, Andrea ; Montaner-Pizá, A. ; Yoshinaga, K.
Issue Date25-Jul-2014
PublisherAmerican Physical Society
CitationPhysical Review Letters 113: 042502 (2014)
AbstractA new isomer with a half-life of 23.0(8) ms has been identified at 2406 keV in Pd126 and is proposed to have a spin and parity of 10+ with a maximally aligned configuration comprising two neutron holes in the 1h11/2 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 Ag126. The smaller energy difference between the 10+ and 7- isomers in Pd126 than in the heavier N=80 isotones can be interpreted as being ascribed to the monopole shift of the 1h11/2 neutron orbit. The effects of the monopole interaction on the evolution of single-neutron energies below Sn132 are discussed in terms of the central and tensor forces. © 2014 American Physical Society.
DescriptionH. Watanabe et al. ; 6 pags. ; 3 figs. ; 1 tab. PACS numbers: 23.35.+g, 23.20.Lv, 23.40.−s, 27.60.+j
Identifiersissn: 1079-7114
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