Proton and neutron knockout from 36Ca

R. Shane, R. J. Charity, L. G. Sobotka, D. Bazin, B. A. Brown, A. Gade, G. F. Grinyer, S. McDaniel, A. Ratkiewicz, D. Weisshaar, A. Bonaccorso, and J. A. Tostevin
Phys. Rev. C 85, 064612 – Published 15 June 2012

Abstract

The cross sections for single-nucleon knockout from 36Ca on a 9Be target at 70 MeV/nucleon were measured to be σexp(p)=51.1±2.6 mb for proton knockout and σexp(n)=5.03±0.46 mb for neutron knockout. The spectroscopic factors and orbital angular momenta of the neutrons and protons removed from 36Ca, leading to bound A=35 residues, were deduced by comparison of the experimental cross sections and longitudinal-momentum distributions to those calculated in an eikonal reaction theory, and found to be S(p,1d3/2)=0.79±0.04 and S(n,2s1/2)=0.23±0.02 (relative to independent-particle-model values and only including experimental contributions to the uncertainties). As found in previous knockout studies, the spectroscopic factor deduced for the deeply bound neutron was significantly reduced relative to shell-model calculations, a result at variance with dispersive optical model (DOM) extrapolations, which suggest a spectroscopic factor closer to 60% of the independent-particle-model value.

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  • Received 29 March 2012

DOI:https://doi.org/10.1103/PhysRevC.85.064612

©2012 American Physical Society

Authors & Affiliations

R. Shane*, R. J. Charity, and L. G. Sobotka

  • Departments of Physics and Chemistry, Washington University, St. Louis, Missouri 63130, USA

D. Bazin, B. A. Brown, A. Gade, G. F. Grinyer, S. McDaniel, A. Ratkiewicz, and D. Weisshaar

  • National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA

A. Bonaccorso

  • Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, Italy

J. A. Tostevin

  • Department of Physics, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom

  • *Present address: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
  • Present address: GANIL, CEA/DSM-CNRS/IN2P3, Bvd Henri Becquerel, 14076 Caen, France.

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Issue

Vol. 85, Iss. 6 — June 2012

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