Characterization of long-lived isomers in the odd-odd heavy actinide Md254

P. C. Sood and R. Gowrishankar
Phys. Rev. C 95, 024317 – Published 15 February 2017

Abstract

Bandhead energies of all the physically admissible low-lying two-quasiparticle configuration states in the doubly-odd heavy actinide Md153101254 are evaluated using the well-tested two-quasiparticle rotor model with explicit inclusion of the residual proton-neutron interaction. A critical examination of these results, aimed at characterization of the long-lived (t1/2=10 min and 28 min; %ɛ100) isomer pair, conclusively rules out a high-spin (J5) assignment for either of the isomers. Our analysis leads to JπK=10{p:1/2[521]n:1/2+)[620]} and 33{p:7/2[514]n:1/2+[620]} assignments, respectively, to these isomers and designates the 10-min isomer as its ground state. Our study reveals a “landmark” position for Md254 in the decay path of super heavy elements. The as-yet unobserved electron capture decay branches from each of the two Md254 isomers to Fm254 levels are specified.

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  • Received 1 October 2016
  • Revised 11 January 2017

DOI:https://doi.org/10.1103/PhysRevC.95.024317

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

P. C. Sood and R. Gowrishankar

  • Department of Physics, Sri Sathya Sai Institute of Higher Learning, Prasanthi Nilayam (AP) 515134, India

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Issue

Vol. 95, Iss. 2 — February 2017

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