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Title: Role of the ν g 9 / 2 orbital in the development of collectivity in the A 60 region: The case of Co 61

Abstract

An extensive study of the level structure of Co-61 has been performed following the complex Mg-26(Ca-48, 2 alpha 4np gamma)Co-61 reaction at beam energies of 275, 290, and 320 MeV using Gammasphere and the Fragment Mass Analyzer (FMA). The low-spin structure is discussed within the framework of shell-model calculations using the GXPF1A effective interaction. Two quasirotational bands consisting of stretched-E2 transitions have been established up to spins I = 41/2 and (43/2), and excitation energies of similar to 17 and similar to 20 MeV, respectively. These are interpreted as signature partners built on a neutron nu(g(9/2))(2) configuration coupled to a proton pi p(3/2) state, based on cranked shell model (CSM) calculations and comparisons with observations in neighboring nuclei. In addition, four Delta I = 1 bands were populated to high spin, with the yrast dipole band interpreted as a possible candidate for the shears mechanism, a process seldom observed thus far in this mass region.

Authors:
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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1392325
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 91; Journal Issue: 4
Country of Publication:
United States
Language:
English

Citation Formats

Ayangeakaa, A. D., Zhu, S., Janssens, R. V. F., Carpenter, M. P., Albers, M., Alcorta, M., Baugher, T., Bertone, P. F., 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., Moerland, D. S., Nair, C., Rogers, A. M., and Seweryniak, D. Role of the νg9/2 orbital in the development of collectivity in the A≈60 region: The case of Co61. United States: N. p., 2015. Web. doi:10.1103/PhysRevC.91.044327.
Ayangeakaa, A. D., Zhu, S., Janssens, R. V. F., Carpenter, M. P., Albers, M., Alcorta, M., Baugher, T., Bertone, P. F., 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., Moerland, D. S., Nair, C., Rogers, A. M., & Seweryniak, D. Role of the νg9/2 orbital in the development of collectivity in the A≈60 region: The case of Co61. United States. doi:10.1103/PhysRevC.91.044327.
Ayangeakaa, A. D., Zhu, S., Janssens, R. V. F., Carpenter, M. P., Albers, M., Alcorta, M., Baugher, T., Bertone, P. F., 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., Moerland, D. S., Nair, C., Rogers, A. M., and Seweryniak, D. Wed . "Role of the νg9/2 orbital in the development of collectivity in the A≈60 region: The case of Co61". United States. doi:10.1103/PhysRevC.91.044327.
@article{osti_1392325,
title = {Role of the νg9/2 orbital in the development of collectivity in the A≈60 region: The case of Co61},
author = {Ayangeakaa, A. D. and Zhu, S. and Janssens, R. V. F. and Carpenter, M. P. and Albers, M. and Alcorta, M. and Baugher, T. and Bertone, P. F. 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 Moerland, D. S. and Nair, C. and Rogers, A. M. and Seweryniak, D.},
abstractNote = {An extensive study of the level structure of Co-61 has been performed following the complex Mg-26(Ca-48, 2 alpha 4np gamma)Co-61 reaction at beam energies of 275, 290, and 320 MeV using Gammasphere and the Fragment Mass Analyzer (FMA). The low-spin structure is discussed within the framework of shell-model calculations using the GXPF1A effective interaction. Two quasirotational bands consisting of stretched-E2 transitions have been established up to spins I = 41/2 and (43/2), and excitation energies of similar to 17 and similar to 20 MeV, respectively. These are interpreted as signature partners built on a neutron nu(g(9/2))(2) configuration coupled to a proton pi p(3/2) state, based on cranked shell model (CSM) calculations and comparisons with observations in neighboring nuclei. In addition, four Delta I = 1 bands were populated to high spin, with the yrast dipole band interpreted as a possible candidate for the shears mechanism, a process seldom observed thus far in this mass region.},
doi = {10.1103/PhysRevC.91.044327},
journal = {Physical Review. C, Nuclear Physics},
number = 4,
volume = 91,
place = {United States},
year = {Wed Apr 01 00:00:00 EDT 2015},
month = {Wed Apr 01 00:00:00 EDT 2015}
}