Be9(p, pα)He5 Reaction at 57 MeV

P. G. Roos, H. G. Pugh, Mahavir Jain, H. D. Holmgren, Martin Epstein, and C. A. Ludemann
Phys. Rev. 176, 1246 – Published 20 December 1968
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Abstract

The Be9(p, pα)He5 reaction was studied using 57-MeV protons from the Oak Ridge isochronous cyclotron. The correlated energies of both the emitted protons and α particles were measured at detection angles (θp, θα) of (94°, -35.3°), (105°, -30°), and (116°, -25.1°), where the detectors were coplanar with the beam. In addition, an angular correlation was measured by fixing θp at 105° and varying θα from -21° to -39° in 3° steps. The data for the reaction leading to the ground state of He5 were found to be consistent with quasifree scattering of the incident protons by S-state α-particle clusters in Be9. Analysis in terms of a plane-wave impulse approximation yields a momentum density distribution for the struck α particles which has a half-width of 0.27 F1, and a probability of finding an α-particle cluster in Be9 of 0.250.12+0.25.

  • Received 12 August 1968

DOI:https://doi.org/10.1103/PhysRev.176.1246

©1968 American Physical Society

Authors & Affiliations

P. G. Roos*, H. G. Pugh, Mahavir Jain, H. D. Holmgren, and Martin Epstein

  • University of Maryland, College Park, Maryland 20742

C. A. Ludemann

  • Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830

  • *Work done while at Oak Ridge National Laboratory as a USAEC Post-doctoral Fellow under appointment from the Oak Ridge Associated Universities.
  • Now at the University of California, Los Angeles, Calif.

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Vol. 176, Iss. 4 — December 1968

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