Yrast structures in the neutron-rich isotopes $^{59,60}\mathrm{Fe}$ and the role of the ${g}_{9/2}$ orbital

Yrast structures in the neutron-rich isotopes ${}^{59, 60}{Fe}$ and the role of the $g_{9 / 2}$ orbital

A. N. Deacon, S. J. Freeman, R. V. F. Janssens, M. Honma, M. P. Carpenter, P. Chowdhury, T. Lauritsen, C. J. Lister, D. Seweryniak, J. F. Smith, S. L. Tabor, B. J. Varley, F. R. Xu, and S. Zhu

Phys. Rev. C 76, 054303 – Published 2 November 2007

Abstract

The structure of the neutron-rich isotopes ${}^{59, 60}{Fe}$ has been studied with the Gammasphere detector array using fusion-evaporation reactions. Level schemes for these nuclei are presented which have been extended to spins of $~ 20 ℏ$ . Both isotopes exhibit regular, near-yrast γ-decay sequences which are generated by the intrusion of the $g_{9 / 2}$ orbital into the $fp$ shell-model space. Lower-spin, natural-parity levels are discussed within the context of shell-model calculations using the GXPF1A interaction in the full $fp$ model space. Experimental features of the high-spin bands are compared with total Routhian surface calculations.

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Received 9 August 2007

DOI:https://doi.org/10.1103/PhysRevC.76.054303

Authors & Affiliations

A. N. Deacon^1,*, S. J. Freeman¹, R. V. F. Janssens², M. Honma³, M. P. Carpenter², P. Chowdhury⁴, T. Lauritsen², C. J. Lister², D. Seweryniak², J. F. Smith^1,†, S. L. Tabor⁵, B. J. Varley¹, F. R. Xu⁶, and S. Zhu²

¹Schuster Laboratory, University of Manchester, Manchester M13 9PL, United Kingdom
²Argonne National Laboratory, Argonne, Illinois 60439, USA
³Center for Mathematical Sciences, University of Aizu, Tsuruga, Ikki-machi, Aizu-Wakamatsu, Fukushima 965-8580, Japan
⁴University of Massachusetts, Lowell, Massachusetts 01854, USA
⁵Department of Physics, Florida State University, Tallahasse, Florida 32306, USA
⁶Department of Technical Physics, Peking University, Beijing 100871, People's Republic of China

^*alick.deacon@manchester.ac.uk
^†Current address: School of Engineering and Science, University of Paisley, Paisley PA1 2BE, UK.

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Vol. 76, Iss. 5 — November 2007

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Physical Review C

covering nuclear physics

Yrast structures in the neutron-rich isotopes ${}^{59, 60}{Fe}$ and the role of the $g_{9 / 2}$ orbital

A. N. Deacon, S. J. Freeman, R. V. F. Janssens, M. Honma, M. P. Carpenter, P. Chowdhury, T. Lauritsen, C. J. Lister, D. Seweryniak, J. F. Smith, S. L. Tabor, B. J. Varley, F. R. Xu, and S. Zhu

Phys. Rev. C 76, 054303 – Published 2 November 2007

Abstract

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Physical Review C

covering nuclear physics

Yrast structures in the neutron-rich isotopes Fe59,60 and the role of the g9/2 orbital

A. N. Deacon, S. J. Freeman, R. V. F. Janssens, M. Honma, M. P. Carpenter, P. Chowdhury, T. Lauritsen, C. J. Lister, D. Seweryniak, J. F. Smith, S. L. Tabor, B. J. Varley, F. R. Xu, and S. Zhu

Phys. Rev. C 76, 054303 – Published 2 November 2007

Abstract

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Yrast structures in the neutron-rich isotopes ${}^{59, 60}{Fe}$ and the role of the $g_{9 / 2}$ orbital