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First observation of the decay of a 15(-) seniority v=4 isomer in Sn-128
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2011 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 83, no 4, 044328- p.Article in journal (Refereed) Published
Abstract [en]

Isomeric states in the semimagic Sn128-130 isotopes were populated in the fragmentation of a Xe-136 beam on a Be-9 target at an energy of 750 A.MeV. The decay of an isomeric state in Sn-128 at an excitation energy of 4098 keV has been observed. Its half live has been determined to be T-1/2 = 220(30) ns from the time distributions of the delayed gamma rays emitted in its decay. gamma gamma coincidence relations were analyzed in order to establish the decay pattern of the newly established state toward the known (7(-)) and (10(+)) isomers at excitation energies of 2092 and 2492 keV, respectively. Based on a comparison with results of state-of-the-art shell-model calculations the new isomeric state is proposed to have the nu h(11/2)(-3)d(3/2)(-1) configuration with the four neutron holes in Sn-132 maximally aligned to a total spin of I-pi = 15(-).

Place, publisher, year, edition, pages
2011. Vol. 83, no 4, 044328- p.
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Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-33957DOI: 10.1103/PhysRevC.83.044328ISI: 000290163900004Scopus ID: 2-s2.0-79960922942OAI: oai:DiVA.org:kth-33957DiVA: diva2:421617
Note
QC 20110609Available from: 2011-06-09 Created: 2011-05-23 Last updated: 2017-12-11Bibliographically approved

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Cederwall, Bo

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