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Title: Identification of deformed intruder states in semi-magic Ni 70

Abstract

The structure of semi-magic Ni-70(28)42 was investigated following complementary multinucleon-transfer and secondary fragmentation reactions. Changes to the higher-spin, presumed negative-parity states based on observed gamma-ray coincidence relationships result in better agreement with shell-model calculations using effective interactions in the neutron f(5/2)pg(9/2) model space. The second 2(+) and (4(+)) states, however, can only be successfully described when proton excitations across the Z = 28 shell gap are included. Monte Carlo shell-model calculations suggest that the latter two states are part of a prolate-deformed intruder sequence, establishing an instance of shape coexistence at low excitation energies similar to that observed recently in neighboring Ni-68.

Authors:
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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1391777
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 91; Journal Issue: 4; Journal ID: ISSN 0556-2813
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

Chiara, C. J., Weisshaar, D., Janssens, R. V. F., Tsunoda, Y., Otsuka, T., Harker, J. L., Walters, W. B., Recchia, F., Albers, M., Alcorta, M., Bader, V. M., Baugher, T., Bazin, D., Berryman, J. S., Bertone, P. F., Campbell, C. M., Carpenter, M. P., Chen, J., Crawford, H. L., David, H. M., Doherty, D. T., Gade, A., Hoffman, C. R., Honma, M., Kondev, F. G., Korichi, A., Langer, C., Larson, N., Lauritsen, T., Liddick, S. N., Lunderberg, E., Macchiavelli, A. O., Noji, S., Prokop, C., Rogers, A. M., Seweryniak, D., Shimizu, N., Stroberg, S. R., Suchyta, S., Utsuno, Y., Williams, S. J., Wimmer, K., and Zhu, S. Identification of deformed intruder states in semi-magic Ni70. United States: N. p., 2015. Web. doi:10.1103/PhysRevC.91.044309.
Chiara, C. J., Weisshaar, D., Janssens, R. V. F., Tsunoda, Y., Otsuka, T., Harker, J. L., Walters, W. B., Recchia, F., Albers, M., Alcorta, M., Bader, V. M., Baugher, T., Bazin, D., Berryman, J. S., Bertone, P. F., Campbell, C. M., Carpenter, M. P., Chen, J., Crawford, H. L., David, H. M., Doherty, D. T., Gade, A., Hoffman, C. R., Honma, M., Kondev, F. G., Korichi, A., Langer, C., Larson, N., Lauritsen, T., Liddick, S. N., Lunderberg, E., Macchiavelli, A. O., Noji, S., Prokop, C., Rogers, A. M., Seweryniak, D., Shimizu, N., Stroberg, S. R., Suchyta, S., Utsuno, Y., Williams, S. J., Wimmer, K., & Zhu, S. Identification of deformed intruder states in semi-magic Ni70. United States. doi:10.1103/PhysRevC.91.044309.
Chiara, C. J., Weisshaar, D., Janssens, R. V. F., Tsunoda, Y., Otsuka, T., Harker, J. L., Walters, W. B., Recchia, F., Albers, M., Alcorta, M., Bader, V. M., Baugher, T., Bazin, D., Berryman, J. S., Bertone, P. F., Campbell, C. M., Carpenter, M. P., Chen, J., Crawford, H. L., David, H. M., Doherty, D. T., Gade, A., Hoffman, C. R., Honma, M., Kondev, F. G., Korichi, A., Langer, C., Larson, N., Lauritsen, T., Liddick, S. N., Lunderberg, E., Macchiavelli, A. O., Noji, S., Prokop, C., Rogers, A. M., Seweryniak, D., Shimizu, N., Stroberg, S. R., Suchyta, S., Utsuno, Y., Williams, S. J., Wimmer, K., and Zhu, S. Wed . "Identification of deformed intruder states in semi-magic Ni70". United States. doi:10.1103/PhysRevC.91.044309.
@article{osti_1391777,
title = {Identification of deformed intruder states in semi-magic Ni70},
author = {Chiara, C. J. and Weisshaar, D. and Janssens, R. V. F. and Tsunoda, Y. and Otsuka, T. and Harker, J. L. and Walters, W. B. and Recchia, F. and Albers, M. and Alcorta, M. and Bader, V. M. and Baugher, T. and Bazin, D. and Berryman, J. S. and Bertone, P. F. and Campbell, C. M. and Carpenter, M. P. and Chen, J. and Crawford, H. L. and David, H. M. and Doherty, D. T. and Gade, A. and Hoffman, C. R. and Honma, M. and Kondev, F. G. and Korichi, A. and Langer, C. and Larson, N. and Lauritsen, T. and Liddick, S. N. and Lunderberg, E. and Macchiavelli, A. O. and Noji, S. and Prokop, C. and Rogers, A. M. and Seweryniak, D. and Shimizu, N. and Stroberg, S. R. and Suchyta, S. and Utsuno, Y. and Williams, S. J. and Wimmer, K. and Zhu, S.},
abstractNote = {The structure of semi-magic Ni-70(28)42 was investigated following complementary multinucleon-transfer and secondary fragmentation reactions. Changes to the higher-spin, presumed negative-parity states based on observed gamma-ray coincidence relationships result in better agreement with shell-model calculations using effective interactions in the neutron f(5/2)pg(9/2) model space. The second 2(+) and (4(+)) states, however, can only be successfully described when proton excitations across the Z = 28 shell gap are included. Monte Carlo shell-model calculations suggest that the latter two states are part of a prolate-deformed intruder sequence, establishing an instance of shape coexistence at low excitation energies similar to that observed recently in neighboring Ni-68.},
doi = {10.1103/PhysRevC.91.044309},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 4,
volume = 91,
place = {United States},
year = {2015},
month = {4}
}

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