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Title: Probing the role of proton cross-shell excitations in Ni 70 using nucleon knockout reactions

Abstract

The neutron-rich Ni isotopes have attracted attention in recent years because of the occurrence of shape or configuration coexistence. In this work, we discuss the difference in population of excited final states in 70Ni following γ-ray tagged one-proton, one-neutron, and two-proton knockout from 71Cu, 71Ni, and 72Zn rare-isotope beams, respectively. Using variations observed in the relative transition intensities, signaling the changed population of specific final states in the different reactions, the role of neutron and proton configurations in excited states of 70Ni is probed schematically, with the goal of identifying those that carry, as leading configuration, proton excitations across the Z = 28 shell closure. Such states are implied in the literature to form a collective structure associated with prolate deformation. Adding to the body of knowledge for 70Ni, 29 new transitions are reported, of which 15 are placed in its level scheme.

Authors:
 [1]; ORCiD logo [1];  [2];  [3];  [1];  [1];  [4];  [1];  [5];  [6];  [5];  [7];  [5];  [8];  [9];  [1];  [1];  [1];  [1];  [8] more »;  [10];  [8];  [1];  [11] « less
  1. Michigan State Univ., East Lansing, MI (United States)
  2. Univ. of North Carolina, Chapel Hill, NC (United States)
  3. United States Naval Academy, Annapolis, MD (United States)
  4. Michigan State Univ., East Lansing, MI (United States); Univ. of Massachusetts, Lowell, MA (United States)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  6. Argonne National Lab. (ANL), Argonne, IL (United States)
  7. Michigan State Univ., East Lansing, MI (United States); Mississippi State Univ., Mississippi State, MS (United States)
  8. Univ. of Maryland, College Park, MD (United States)
  9. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Maryland, College Park, MD (United States)
  10. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of Tokyo (Japan); RIKEN, Saitama (Japan); Univ. of York (United Kingdom)
  11. 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.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1574952
Alternate Identifier(s):
OSTI ID: 1562567
Grant/Contract Number:  
AC02-06CH11357; FG02-94ER40834; FG02-08ER41556; FG02-97ER41041; FG02-97ER41033; NA0003180; SC0014537; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 100; Journal Issue: 3; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Elman, B., Gade, A., Janssens, R. V. F., Ayangeakaa, A. D., Bazin, D., Belarge, J., Bender, P. C., Brown, B. A., Campbell, C. M., Carpenter, M. P., Crawford, H. L., Crider, B. P., Fallon, P., Forney, A. M., Harker, J., Liddick, S. N., Longfellow, B., Lunderberg, E., Prokop, C. J., Sethi, J., Taniuchi, R., Walters, W. B., Weisshaar, D., and Zhu, S. Probing the role of proton cross-shell excitations in Ni70 using nucleon knockout reactions. United States: N. p., 2019. Web. doi:10.1103/PhysRevC.100.034317.
Elman, B., Gade, A., Janssens, R. V. F., Ayangeakaa, A. D., Bazin, D., Belarge, J., Bender, P. C., Brown, B. A., Campbell, C. M., Carpenter, M. P., Crawford, H. L., Crider, B. P., Fallon, P., Forney, A. M., Harker, J., Liddick, S. N., Longfellow, B., Lunderberg, E., Prokop, C. J., Sethi, J., Taniuchi, R., Walters, W. B., Weisshaar, D., & Zhu, S. Probing the role of proton cross-shell excitations in Ni70 using nucleon knockout reactions. United States. doi:10.1103/PhysRevC.100.034317.
Elman, B., Gade, A., Janssens, R. V. F., Ayangeakaa, A. D., Bazin, D., Belarge, J., Bender, P. C., Brown, B. A., Campbell, C. M., Carpenter, M. P., Crawford, H. L., Crider, B. P., Fallon, P., Forney, A. M., Harker, J., Liddick, S. N., Longfellow, B., Lunderberg, E., Prokop, C. J., Sethi, J., Taniuchi, R., Walters, W. B., Weisshaar, D., and Zhu, S. Wed . "Probing the role of proton cross-shell excitations in Ni70 using nucleon knockout reactions". United States. doi:10.1103/PhysRevC.100.034317.
@article{osti_1574952,
title = {Probing the role of proton cross-shell excitations in Ni70 using nucleon knockout reactions},
author = {Elman, B. and Gade, A. and Janssens, R. V. F. and Ayangeakaa, A. D. and Bazin, D. and Belarge, J. and Bender, P. C. and Brown, B. A. and Campbell, C. M. and Carpenter, M. P. and Crawford, H. L. and Crider, B. P. and Fallon, P. and Forney, A. M. and Harker, J. and Liddick, S. N. and Longfellow, B. and Lunderberg, E. and Prokop, C. J. and Sethi, J. and Taniuchi, R. and Walters, W. B. and Weisshaar, D. and Zhu, S.},
abstractNote = {The neutron-rich Ni isotopes have attracted attention in recent years because of the occurrence of shape or configuration coexistence. In this work, we discuss the difference in population of excited final states in 70Ni following γ-ray tagged one-proton, one-neutron, and two-proton knockout from 71Cu, 71Ni, and 72Zn rare-isotope beams, respectively. Using variations observed in the relative transition intensities, signaling the changed population of specific final states in the different reactions, the role of neutron and proton configurations in excited states of 70Ni is probed schematically, with the goal of identifying those that carry, as leading configuration, proton excitations across the Z = 28 shell closure. Such states are implied in the literature to form a collective structure associated with prolate deformation. Adding to the body of knowledge for 70Ni, 29 new transitions are reported, of which 15 are placed in its level scheme.},
doi = {10.1103/PhysRevC.100.034317},
journal = {Physical Review C},
number = 3,
volume = 100,
place = {United States},
year = {2019},
month = {9}
}

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