Six-quasiparticle isomer in Nd140

C. M. Petrache, R. A. Bark, S. T. H. Murray, M. Fantuzi, E. A. Lawrie, S. Lang, J. J. Lawrie, S. M. Maliage, D. Mengoni, S. M. Mullins, S. S. Ntshangase, D. Petrache, T. M. Ramashidzha, and I. Ragnarsson
Phys. Rev. C 74, 034304 – Published 6 September 2006

Abstract

A search for isomeric states was performed in the nucleus 60140Nd80 using in-beam γ-ray spectroscopy and the Te126(O18,4n) reaction. Prompt and delayed γ-ray coincidences were measured with the AFRODITE spectrometer using the pulsed beam delivered by the Separated Sector Cyclotron of iThemba LABS. One new isomer was identified, with spin-parity Iπ=20+ and lifetime T1/2400 ns, at an excitation energy Ex=7430 keV. The lifetime of the 10+ isomer at Ex=3619 keV was determined to be 32.9(1.8) ns, confirming the previously reported value. The configuration of the Iπ=20+ isomer is assigned based on configuration-dependent cranked Nilsson-Strutinsky (CNS) calculations as a state π(d5/2g7/2)10+4ν(h11/22)10+, with the spin vectors of the six holes in the 64146Gd82 core fully aligned.

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  • Received 8 March 2006

DOI:https://doi.org/10.1103/PhysRevC.74.034304

©2006 American Physical Society

Authors & Affiliations

C. M. Petrache1, R. A. Bark2, S. T. H. Murray2, M. Fantuzi1, E. A. Lawrie2, S. Lang2,3, J. J. Lawrie2, S. M. Maliage2,3, D. Mengoni1, S. M. Mullins2, S. S. Ntshangase2,4, D. Petrache1, T. M. Ramashidzha2,3, and I. Ragnarsson5

  • 1Dipartimento di Fisica, Università di Camerino and INFN, Sezione di Perugia, I-62032, Camerino, Italy
  • 2iThemba LABS, PO Box 722, Somerset West 7129, South Africa
  • 3University of the Western Cape Bellville 7535, South Africa
  • 4Dept. of Physics, University of Zululand, Private Bag X1001, KwaDlangezwa, 3886, South Africa
  • 5Department of Mathematical Physics, Lund Institute of Technology, S-22362 Lund, Sweden

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Issue

Vol. 74, Iss. 3 — September 2006

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