Measurement of He4(p,n) at 100 and 200MeV: Analysis with recoil-corrected continuum shell model

C. M. Riedel, D. Dehnhard, M. Palarczyk, M. A. Espy, M. A. Franey, J. L. Langenbrunner, L. C. Bland, D. S. Carman, B. Brinkmöller, R. Madey, Y. Wang, and J. W. Watson
Phys. Rev. C 69, 024616 – Published 27 February 2004

Abstract

Double-differential cross sections d2σ(dΩdEx) and spectra of analyzing powers, Ay, for the He4(p,n) reaction were measured at Tp100 and 200MeV at forward angles between θlab=0° and 44°, and were analyzed using wave functions from the recoil-corrected continuum shell model (RCCSM). The steep rise of the cross-section spectra just above the p+He3 rest energy threshold results from the excitation of the 2 and 1 resonances in Li4 and is well reproduced by the RCCSM at both incident energies. At higher excitation energies, the predicted cross sections fall off faster than the experimental values at forward angles. The absolute cross sections from the RCCSM were renormalized by factors of 1.3 and 1.6 at 100MeV and 200MeV, respectively, in order to fit the cross section summed over the lowest 10MeV of excitation at the peak of the angular distribution. The 100MeV Ay, averaged over the lowest 10MeV of excitation, are well reproduced by the RCCSM but not the 200MeV Ay, nor are the details of the Ay spectra well described at either energy.

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  • Received 26 November 2003

DOI:https://doi.org/10.1103/PhysRevC.69.024616

©2004 American Physical Society

Authors & Affiliations

C. M. Riedel*, D. Dehnhard, M. Palarczyk, M. A. Espy, M. A. Franey, and J. L. Langenbrunner

  • School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA

L. C. Bland§ and D. S. Carman

  • Department of Physics, Indiana University, Bloomington, Indiana 47405, USA

B. Brinkmöller

  • Physikalisches Institut der Universität Karlsruhe, Karlsruhe, Germany

R. Madey, Y. Wang**, and J. W. Watson

  • Department of Physics, Kent State University, Kent, Ohio 44242, USA

  • *Present address: Department of Physics, Montana State University, Bozeman, Montana 59717. Electronic address: riedel@physics.montana.edu
  • Present address: Henryk Niewodniczański Institute of Nuclear Physics, 31-342 Kraków, Poland.
  • Present address: Los Alamos National Laboratory, Los Alamos, New Mexico 87545.
  • §Present address: Brookhaven National Laboratory, Upton, New York 11973.
  • Present address: Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701.
  • Present address: S.A.P.-A.G., Walldorf, Germany.
  • **Present address: St. Francis Hospital, Topeka, Kansas 66606.

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Issue

Vol. 69, Iss. 2 — February 2004

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