Valence nucleon populations in the Ni isotopes

J. P. Schiffer, C. R. Hoffman, B. P. Kay, J. A. Clark, C. M. Deibel, S. J. Freeman, M. Honma, A. M. Howard, A. J. Mitchell, T. Otsuka, P. D. Parker, D. K. Sharp, and J. S. Thomas

Phys. Rev. C 87, 034306 – Published 6 March 2013

Abstract

Measurements of neutron-adding, neutron-removing, and proton-adding reactions were carried out for the four stable even Ni isotopes. Particular attention was paid to obtaining precise values of the cross sections at the peaks of the angular distributions. Tests with sum rules for the neutron data indicate that the results are self-consistent at the level of a few tenths of a nucleon. Data on proton-adding reactions were also obtained and analyzed with a slightly different method—while these data are also consistent, the ambiguities are larger. The occupancies of the neutron orbits derived from the data, the proton vacancies, and the energy centroids of the neutron, neutron-hole, and proton single-particle excitations are obtained. The data also provide some estimate about the closure of the 0 $f_{7 / 2}$ shell. The results are compared to shell-model calculations and may serve as a reference point for future exploration.

12 More

Received 14 November 2012

DOI:https://doi.org/10.1103/PhysRevC.87.034306

Authors & Affiliations

J. P. Schiffer^1,*, C. R. Hoffman¹, B. P. Kay^1,†, J. A. Clark¹, C. M. Deibel^1,2,‡, S. J. Freeman³, M. Honma⁴, A. M. Howard^3,§, A. J. Mitchell^3,∥, T. Otsuka⁵, P. D. Parker⁶, D. K. Sharp³, and J. S. Thomas³

¹Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
²Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
³School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
⁴Center for Mathematical Science, University of Aizu, Aizu-Wakamatsu, Fukushima 965-8580, Japan
⁵Department of Physics and Center for Nuclear Study, University of Tokyo, Hongo, Tokyo 113-0033, Japan and RIKEN, Hirosawa, Wako-shi, Saitama 351-0198, Japan
⁶A. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520, USA

^*schiffer@anl.gov
^†Present address: Physics Department, University of York, Heslington, York Y01 5DD, United Kingdom.
^‡Present address: Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA.
^§Present address: Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA.
^∥Present address: Department of Physics, University of Massachusetts Lowell, Lowell, Massachusetts 01854, USA.

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand

Issue

Vol. 87, Iss. 3 — March 2013

Reuse & Permissions

Access Options

Article Available via CHORUS

Download Accepted Manuscript

Author publication services for translation and copyediting assistance advertisement

Physical Review C

covering nuclear physics