Neutron pickup strength in Sr87 from the (p→,d) reaction

M. C. Radhakrishna, N. G. Puttaswamy, H. Nann, D. W. Miller, P. P. Singh, W. W. Jacobs, W. P. Jones, and E. J. Stephenson
Phys. Rev. C 40, 1603 – Published 1 October 1989
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Abstract

Differential cross section and analyzing power angular distributions have been obtained for the (p87,d)86Sr reaction in two measurements using different magnetic spectrometers at incident proton energies of 94.2 and 91.8 MeV. Typical energy resolutions of 70 and 40 keV, respectively, were achieved. Optical-model parameters were obtained by fitting the elastic scattering data measured to laboratory angles of 90° for protons at 94.2 MeV and to 120° for deuterons at 88.0 MeV. Standard exact finite range distorted-wave Born approximation calculations using these optical-model parameters failed to describe the experimental data, while the adiabatic approximation improved the description to some extent. Orbital and total angular momenta, l and j, of the picked-up neutron were extracted from the angular distributions of the differential cross section and analyzing power for all the residual states observed. The rms radius of the 1g9/2 neutron orbital, obtained from magnetic electron scattering, was used in the extraction of strength for this orbital, while rms radii from Hartree-Fock calculations were used for the 2p1/2, 2p3/2, 1f5/2, and 1f7/2 orbitals. The observed 1g9/2 strength, spread over 20 states up to 5.4-MeV excitation, indicates a depletion of about 43% compared to simple shell-model expectations. Similarly, the observed 1f5/2 strength, spread over 17 states, indicates a depletion of about 32%. The weighted summed spectroscopic strength for the 1g9/2 orbital, deduced from the present study, is lower than that obtained from magnetic electron scattering.

  • Received 30 May 1989

DOI:https://doi.org/10.1103/PhysRevC.40.1603

©1989 American Physical Society

Authors & Affiliations

M. C. Radhakrishna, N. G. Puttaswamy, H. Nann, D. W. Miller, P. P. Singh, W. W. Jacobs, W. P. Jones, and E. J. Stephenson

  • Department of Physics and Indiana University Cyclotron Facility, Bloomington, Indiana 47405

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Vol. 40, Iss. 4 — October 1989

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