Single-particle and collective structures in $^{55}\mathrm{Cr}$ and $^{55}\mathrm{V}$

Single-particle and collective structures in ${}^{55}{Cr}$ and ${}^{55}V$

A. N. Deacon, D. Steppenbeck, S. Zhu, S. J. Freeman, R. V. F. Janssens, M. P. Carpenter, B. Fornal, M. Honma, B. P. Kay, F. G. Kondev, J. Kozemczak, A. Larabee, T. Lauritsen, C. J. Lister, A. P. Robinson, D. Seweryniak, J. F. Smith, Y. Sun, X. Wang, F. R. Xu, and Y.-C. Yang

Phys. Rev. C 83, 064305 – Published 7 June 2011

Abstract

Excited states in ${}^{55}V$ and ${}^{55}{Cr}$ have been populated via $pn$ and $2 n$ evaporation channels, respectively, following the fusion of a ${}^{48}{Ca}$ beam at 172 MeV with a ${}^{9}{Be}$ target. Level schemes have been deduced for the two nuclides to excitation energies of 7467 ( ${}^{55}V$ ) and 12226 keV ( ${}^{55}{Cr}$ ), with spins of 27/ $2^{+}$ and 33/ $2^{+}$ , respectively. Negative-parity states are compared with shell-model calculations using three different effective interactions in the full $fp$ model space. Negative-parity levels of ${}^{55}{Cr}$ are explained in terms of single-particle $fp$ -shell configurations outside $N = 28$ and $N = 32$ cores. Positive-parity states in both isotopes show evidence for the involvement of neutron $g_{9 / 2}$ configurations. In the case of ${}^{55}{Cr}$ , a quasirotational structure based on the 1/ $2^{+}$ [440] Nilsson orbital is observed up to the terminating state. In ${}^{55}V$ , positive-parity states do not exhibit well-developed collective features, and the observation of octupole decays is an indication of their importance in transitions from neutron $g_{9 / 2}$ configurations to the $fp$ shell. Experimental results are compared with the predictions of a traditional shell model, the projected shell model, and total-Routhian-surface calculations.

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Received 21 March 2011

DOI:https://doi.org/10.1103/PhysRevC.83.064305

Authors & Affiliations

A. N. Deacon^1,*, D. Steppenbeck^1,†, S. Zhu², S. J. Freeman¹, R. V. F. Janssens², M. P. Carpenter², B. Fornal³, M. Honma⁴, B. P. Kay^1,‡, F. G. Kondev², J. Kozemczak⁵, A. Larabee⁵, T. Lauritsen², C. J. Lister², A. P. Robinson^2,§, D. Seweryniak², J. F. Smith^1,∥, Y. Sun^6,7,8, X. Wang^2,¶, F. R. Xu⁹, and Y.-C. Yang⁶

¹Schuster Laboratory, University of Manchester, Manchester M13 9PL, United Kingdom
²Argonne National Laboratory, Argonne, Illinois 60439, USA
³Institute of Nuclear Physics, Polish Academy of Sciences, PL-31342 Krakow, Poland
⁴Center for Mathematical Sciences, University of Aizu, Tsuruga, Ikki-machi, Aizu-Wakamatsu, Fukushima 965-8580, Japan
⁵Physics Department, Greenville College, Greenville, Illinois 62246, USA
⁶Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
⁷Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People’s Republic of China
⁸Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
⁹Department of Technical Physics, Peking University, Beijing 100871, People’s Republic of China

^*alick.deacon@manchester.ac.uk
^†Present address: RIKEN Nishina Center, 2-1, Hirosawa, Wako, Saitama 351-0198, Japan.
^‡Present address: Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom.
^§Present address: Schuster Laboratory, University of Manchester, Manchester M13 9PL, United Kingdom.
^∥Present address: School of Engineering, University of the West of Scotland, High Street, Paisley PA1 2BE, United Kingdom.
^¶Present address: Department of Physics, Florida State University, Tallahassee, Florida 32306, USA.

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Vol. 83, Iss. 6 — June 2011

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Physical Review C

covering nuclear physics

Single-particle and collective structures in ${}^{55}{Cr}$ and ${}^{55}V$

A. N. Deacon, D. Steppenbeck, S. Zhu, S. J. Freeman, R. V. F. Janssens, M. P. Carpenter, B. Fornal, M. Honma, B. P. Kay, F. G. Kondev, J. Kozemczak, A. Larabee, T. Lauritsen, C. J. Lister, A. P. Robinson, D. Seweryniak, J. F. Smith, Y. Sun, X. Wang, F. R. Xu, and Y.-C. Yang

Phys. Rev. C 83, 064305 – Published 7 June 2011

Abstract

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Physical Review C

covering nuclear physics

Single-particle and collective structures in Cr55 and V55

A. N. Deacon, D. Steppenbeck, S. Zhu, S. J. Freeman, R. V. F. Janssens, M. P. Carpenter, B. Fornal, M. Honma, B. P. Kay, F. G. Kondev, J. Kozemczak, A. Larabee, T. Lauritsen, C. J. Lister, A. P. Robinson, D. Seweryniak, J. F. Smith, Y. Sun, X. Wang, F. R. Xu, and Y.-C. Yang

Phys. Rev. C 83, 064305 – Published 7 June 2011

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Single-particle and collective structures in ${}^{55}{Cr}$ and ${}^{55}V$