Spectroscopic studies beyond the N=152 neutron gap: Decay of 101255Md and 101256Md

Phys. Rev. C 61, 044301 – Published 24 February 2000
I. Ahmad, R. R. Chasman, and P. R. Fields

Abstract

The isotopes 255Md and 256Md were produced by the irradiation of 253Es with 35–45 MeV α particles by (α,n) and (α,2n) reactions and were removed from the target by a helium jet system. α, γ, and α-γ coincidence spectra were measured with Si and Ge(Li) detectors. From the EC decays of 255Md and 256Md, levels in 255Fm and 256Fm were deduced. Favored α decay of 255Md was found to populate the 7/2-[514] single-particle state in 251Es, thus establishing the 7/2-[514] as the 255Md ground state. Several γ rays were observed in the 256Md α-γ coincidence spectrum. 256Fm is the heaviest nucleus in which excited intrinsic states have been identified.

DOI: http://dx.doi.org/10.1103/PhysRevC.61.044301

  • Received 9 November 1999
  • Published 24 February 2000

© 2000 The American Physical Society

Authors & Affiliations

I. Ahmad, R. R. Chasman, and P. R. Fields*

  • Argonne National Laboratory, Argonne, Illinois 60439

  • *Deceased.

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