$^{58}\mathrm{Ni}$: An Unpaired Band Crossing at New Heights of Angular Momentum for Rotating Nuclei

${}^{58}{Ni}$ : An Unpaired Band Crossing at New Heights of Angular Momentum for Rotating Nuclei

D. Rudolph, B. G. Carlsson, I. Ragnarsson, S. Åberg, C. Andreoiu, M. A. Bentley, M. P. Carpenter, R. J. Charity, R. M. Clark, M. Cromaz, J. Ekman, C. Fahlander, P. Fallon, E. Ideguchi, A. O. Macchiavelli, M. N. Mineva, W. Reviol, D. G. Sarantites, D. Seweryniak, and S. J. Williams

Phys. Rev. Lett. 96, 092501 – Published 8 March 2006

Abstract

High-spin states in ${}^{58}{Ni}$ have been investigated by means of the fusion-evaporation reaction ${}^{28}{Si} ({}^{32}S, 2 p) {}^{58}{Ni}$ at 130 MeV beam energy. Discrete-energy levels are observed in ${}^{58}{Ni}$ at record-breaking 42 MeV excitation energy and angular momenta in excess of $30 ℏ$ . The states form regular rotational bands with unprecedented high rotational frequencies. A comparison with configuration dependent cranked Nilsson-Strutinsky calculations reveals an exceptional two-band crossing scenario, the interaction strength of which is strongly shape dependent.

Received 15 August 2005

DOI:https://doi.org/10.1103/PhysRevLett.96.092501

Authors & Affiliations

D. Rudolph¹, B. G. Carlsson², I. Ragnarsson², S. Åberg², C. Andreoiu^1,*, M. A. Bentley^3,†, M. P. Carpenter⁴, R. J. Charity⁵, R. M. Clark⁶, M. Cromaz⁶, J. Ekman¹, C. Fahlander¹, P. Fallon⁶, E. Ideguchi^5,‡, A. O. Macchiavelli⁶, M. N. Mineva¹, W. Reviol⁵, D. G. Sarantites⁵, D. Seweryniak⁴, and S. J. Williams^3,§

¹Department of Physics, Lund University, S-22100 Lund, Sweden
²Department of Mathematical Physics, Lund Institute of Technology, S-22100 Lund, Sweden
³School of Chemistry and Physics, Keele University, Keele, Staffordshire, ST5 5BG, United Kingdom
⁴Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
⁵Chemistry Department, Washington University, St. Louis, Missouri 63130, USA
⁶Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

^*Present address: Department of Physics, University of Guelph, Guelph, Ontario, Canada N1G 2W1.
^†Present address: Department of Physics, University of York, York, YO10 5DD, United Kingdom.
^‡Present address: Center for Nuclear Study, University of Tokyo, Saitama 351-0198, Japan.
^§Present address: School of Electronics and Physics, University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.

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Vol. 96, Iss. 9 — 10 March 2006

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Physical Review Letters

Ni58: An Unpaired Band Crossing at New Heights of Angular Momentum for Rotating Nuclei

D. Rudolph, B. G. Carlsson, I. Ragnarsson, S. Åberg, C. Andreoiu, M. A. Bentley, M. P. Carpenter, R. J. Charity, R. M. Clark, M. Cromaz, J. Ekman, C. Fahlander, P. Fallon, E. Ideguchi, A. O. Macchiavelli, M. N. Mineva, W. Reviol, D. G. Sarantites, D. Seweryniak, and S. J. Williams

Phys. Rev. Lett. 96, 092501 – Published 8 March 2006

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${}^{58}{Ni}$ : An Unpaired Band Crossing at New Heights of Angular Momentum for Rotating Nuclei