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Title: Single-particle and collective excitations in Ni 62

Abstract

In this study, level sequences of rotational character have been observed in several nuclei in the A = 60 mass region. The importance of the deformation-driving πf7/2 and νg9/2 orbitals on the onset of nuclear deformation is stressed. A measurement was performed in order to identify collective rotational structures in the relatively neutron-rich 62Ni isotope. Here, the 26Mg(48Ca,2α4nγ)62Ni complex reaction at beam energies between 275 and 320 MeV was utilized. Reaction products were identified in mass (A) and charge (Z) with the fragment mass analyzer (FMA) and γ rays were detected with the Gammasphere array. As a result, two collective bands, built upon states of single-particle character, were identified and sizable deformation was assigned to both sequences based on the measured transitional quadrupole moments, herewith quantifying the deformation at high spin. In conclusion, based on cranked Nilsson-Strutinsky calculations and comparisons with deformed bands in the A = 60 mass region, the two rotational bands are understood as being associated with configurations involving multiple f7/2 protons and g9/2 neutrons, driving the nucleus to sizable prolate deformation.

Authors:
 [1];  [1];  [1];  [1];  [2];  [3];  [4];  [5];  [6];  [1];  [7];  [8];  [9];  [10];  [1];  [5];  [1];  [1];  [1];  [11] more »;  [12];  [1];  [11];  [1] « less
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Univ. of Groningen, Groningen (The Netherlands)
  3. Lund Univ., Lund (Sweden)
  4. Argonne National Lab. (ANL), Argonne, IL (United States); TRIUMF, Vancouver, BC (Canada)
  5. Michigan State Univ., East Lansing, MI (United States)
  6. Argonne National Lab. (ANL), Argonne, IL (United States); Marshall Space Flight Center, Huntsville, AL (United States)
  7. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Maryland, College Park, MD (United States); U.S. Army Research Lab., Adelphi, MD (United States)
  8. Univ. of Massachusetts, Lowell, MA (United States)
  9. Argonne National Lab. (ANL), Argonne, IL (United States); GSI Helmholtzzentrum fur Schwerionenforschung GmbH, Darmstadt (Germany)
  10. Univ. of Manchester, Manchester (United Kingdom)
  11. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Massachusetts, Lowell, MA (United States)
  12. Argonne National Lab. (ANL), Argonne, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Science Foundation (NSF); Swedish Research Council (SRC); United Kingdom Science and Technology Facilities Council; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1332330
Alternate Identifier(s):
OSTI ID: 1314347
Grant/Contract Number:  
AC02-06CH11357; FG02-94ER40834; FG02-94ER40848; FG02-08ER41556
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 94; Journal Issue: 3; Journal ID: ISSN 2469-9985
Publisher:
APS
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Albers, M., Zhu, S., Ayangeakaa, A. D., Janssens, R. V. F., Gellanki, J., Ragnarsson, I., Alcorta, M., Baugher, T., Bertone, P. F., Carpenter, M. P., Chiara, C. J., Chowdhury, P., David, H. M., Deacon, A. N., DiGiovine, B., Gade, A., Hoffman, C. R., Kondev, F. G., Lauritsen, T., Lister, C. J., McCutchan, E. A., Nair, C., Rogers, A. M., and Seweryniak, D. Single-particle and collective excitations in Ni62. United States: N. p., 2016. Web. doi:10.1103/PhysRevC.94.034301.
Albers, M., Zhu, S., Ayangeakaa, A. D., Janssens, R. V. F., Gellanki, J., Ragnarsson, I., Alcorta, M., Baugher, T., Bertone, P. F., Carpenter, M. P., Chiara, C. J., Chowdhury, P., David, H. M., Deacon, A. N., DiGiovine, B., Gade, A., Hoffman, C. R., Kondev, F. G., Lauritsen, T., Lister, C. J., McCutchan, E. A., Nair, C., Rogers, A. M., & Seweryniak, D. Single-particle and collective excitations in Ni62. United States. doi:10.1103/PhysRevC.94.034301.
Albers, M., Zhu, S., Ayangeakaa, A. D., Janssens, R. V. F., Gellanki, J., Ragnarsson, I., Alcorta, M., Baugher, T., Bertone, P. F., Carpenter, M. P., Chiara, C. J., Chowdhury, P., David, H. M., Deacon, A. N., DiGiovine, B., Gade, A., Hoffman, C. R., Kondev, F. G., Lauritsen, T., Lister, C. J., McCutchan, E. A., Nair, C., Rogers, A. M., and Seweryniak, D. Thu . "Single-particle and collective excitations in Ni62". United States. doi:10.1103/PhysRevC.94.034301. https://www.osti.gov/servlets/purl/1332330.
@article{osti_1332330,
title = {Single-particle and collective excitations in Ni62},
author = {Albers, M. and Zhu, S. and Ayangeakaa, A. D. and Janssens, R. V. F. and Gellanki, J. and Ragnarsson, I. and Alcorta, M. and Baugher, T. and Bertone, P. F. and Carpenter, M. P. and Chiara, C. J. and Chowdhury, P. and David, H. M. and Deacon, A. N. and DiGiovine, B. and Gade, A. and Hoffman, C. R. and Kondev, F. G. and Lauritsen, T. and Lister, C. J. and McCutchan, E. A. and Nair, C. and Rogers, A. M. and Seweryniak, D.},
abstractNote = {In this study, level sequences of rotational character have been observed in several nuclei in the A = 60 mass region. The importance of the deformation-driving πf7/2 and νg9/2 orbitals on the onset of nuclear deformation is stressed. A measurement was performed in order to identify collective rotational structures in the relatively neutron-rich 62Ni isotope. Here, the 26Mg(48Ca,2α4nγ)62Ni complex reaction at beam energies between 275 and 320 MeV was utilized. Reaction products were identified in mass (A) and charge (Z) with the fragment mass analyzer (FMA) and γ rays were detected with the Gammasphere array. As a result, two collective bands, built upon states of single-particle character, were identified and sizable deformation was assigned to both sequences based on the measured transitional quadrupole moments, herewith quantifying the deformation at high spin. In conclusion, based on cranked Nilsson-Strutinsky calculations and comparisons with deformed bands in the A = 60 mass region, the two rotational bands are understood as being associated with configurations involving multiple f7/2 protons and g9/2 neutrons, driving the nucleus to sizable prolate deformation.},
doi = {10.1103/PhysRevC.94.034301},
journal = {Physical Review C},
number = 3,
volume = 94,
place = {United States},
year = {2016},
month = {9}
}

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