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Phys. Rev. C 77, 054306 (2008) [6 pages]

In-beam γ-ray spectroscopy and inclusive two-proton knockout cross section measurements at N≈40

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P. Adrich1,*, A. M. Amthor1,2, D. Bazin1, M. D. Bowen1,2, B. A. Brown1,2, C. M. Campbell1,2, J. M. Cook1,2, A. Gade1,2, D. Galaviz1, T. Glasmacher1,2, S. McDaniel1,2, D. Miller1,2, A. Obertelli1, Y. Shimbara1, K. P. Siwek1,2, J. A. Tostevin3, and D. Weisshaar1
1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
2Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
3Department of Physics, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom

Received 16 November 2007; revised 22 February 2008; published 9 May 2008

In-beam γ-ray spectroscopy of 66,68Fe following intermediate-energy one- and two-proton knockout from cobalt and nickel secondary beams has been performed at the National Superconducting Cyclotron Laboratory. New transitions have been observed in 66Fe and 68Fe. This is the first observation of γ-ray transitions in 68Fe. In addition, 64Cr was produced using the 9Be(66Fe,64Cr)X two-proton knockout reaction. An unexpectedly low inclusive cross section is observed for this reaction, an order of magnitude smaller than for the 9Be(68Ni,66Fe)X reaction. This observation is discussed in terms of a significant structural difference between 66Fe and 64Cr and considerable admixtures of ν(pf)n-2(g9/2)+2 configurations in the ground and excited states of 64Cr at N=40.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.77.054306
DOI:
10.1103/PhysRevC.77.054306
PACS:
23.20.Lv, 27.50.+e, 24.50.+g, 25.60.-t

*adrich@nscl.msu.edu

 
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