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Search for a 2-quasiparticle high-K isomer in (256)Rf

Abstract : The energies of 2-quasiparticle (2-qp) states in heavy shell-stabilized nuclei provide information on the single-particle states that are responsible for the stability of superheavy nuclei. We have calculated the energies of 2-qp states in (256)Rf, which suggest that a long-lived, low-energy 8(-) isomer should exist. A search was conducted for this isomer through a calorimetric conversion electron signal, sandwiched in time between implantation of a (256)Rf nucleus and its fission decay, all within the same pixel of a double-sided Si strip detector. A 17(5)-mu s isomer was identified. However, its low population, similar to 5(2)% that of the ground state instead of the expected similar to 30%, suggests that it is more likely a 4-qp isomer. Possible reasons for the absence of an electromagnetic signature of a 2-qp isomer decay are discussed. These include the favored possibility that the isomer decays by fission, with a half-life indistinguishably close to that of the ground state. Another possibility, that there is no 2-qp isomer at all, would imply an abrupt termination of axially symmetric deformed shapes at Z = 104, which describes nuclei with Z = 92-103 very well.
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http://hal.in2p3.fr/in2p3-00603895
Contributor : Christine Hadrossek <>
Submitted on : Monday, June 27, 2011 - 3:45:17 PM
Last modification on : Wednesday, September 16, 2020 - 4:06:33 PM

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A.P. Robinson, T.L. Khoo, D. Seweryniak, I. Ahmad, M. Asai, et al.. Search for a 2-quasiparticle high-K isomer in (256)Rf. Physical Review C, American Physical Society, 2011, 83, pp.064311. ⟨10.1103/PhysRevC.83.064311⟩. ⟨in2p3-00603895⟩

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