Discovery of a nonyrast K-pi=8(+) isomer in Dy-162, and the influence of competing K-mixing mechanisms on its highly forbidden decay
Swan, TPD, Walker, PM, Podolyak, Z, Reed, MW, Dracoulis, GD, Lane, GJ, Kibedi, T and Smith, ML (2011) Discovery of a nonyrast K-pi=8(+) isomer in Dy-162, and the influence of competing K-mixing mechanisms on its highly forbidden decay PHYSICAL REVIEW C, 83 (3). ? - ?. ISSN 0556-2813
11_dy162prc_preprint.pdf - Accepted Version
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The Gd-160(Be-9,alpha 3n)Dy-162 reaction has been used to study high-spin states in Dy-162. Pulsed beam conditions were utilized for enhanced isomer sensitivity. An isomer at 2188.1(3) keV with a half-life of 8.3(3) mu s has been discovered and assigned K-pi = 8(+) with a two-quasineutron configuration. Among 11 gamma-ray decay branches, an E2, Delta K = 8 transition to the ground-state band was observed with a reduced hindrance of f(v) = 35, agreeing well with systematics correlating f(v) with the product of the valence neutron and proton numbers (NpNn) over an extended N, Z range. Small deviations from NpNn dependence are analyzed for a range of two-quasiparticle isomer decays and interpreted as arising from a weak dependence on the isomer excitation energy relative to the yrast line.
|Uncontrolled Keywords:||Science & Technology, Physical Sciences, Physics, Nuclear, Physics, QUASI-PARTICLE STATES, ATOMIC-NUCLEI, REGIONS|
|Divisions:||Faculty of Engineering and Physical Sciences > Physics|
|Depositing User:||Symplectic Elements|
|Date Deposited:||21 Sep 2011 11:07|
|Last Modified:||23 Sep 2013 18:44|
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