C12(p,2p)B11 Reaction at 50 MeV

H. G. Pugh, D. L. Hendrie, Marc Chabre, E. Boschitz, and I. E. McCarthy
Phys. Rev. 155, 1054 – Published 20 March 1967
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Abstract

The C12(p,2p)B11 reaction has been studied at a bombarding energy of 50.0±0.2 MeV with an energy resolution of 300 keV. Transitions were observed to the ground state and to the 2.14-, 4.46-, 5.04-, and 6.76-MeV excited states of B11. Angular correlation measurements have been made in various coplanar geometrical arrangements. In the symmetric geometry, where the protons are detected at equal angles on either side of the incident beam direction, the angular correlation was measured from 15° to 115°. In an asymmetric geometry in which one detector was fixed at 30°, measurements were made as the other detector was moved between 15° and 100° on the other side of the beam direction. Both of the angular correlations are characterized by a general rise in the forward direction, modulated by a diffractionlike structure, when only those events are selected in which the energies of the selected protons are equal. The results of a distorted-wave analysis are presented and discussed. The formation of the 4.46-MeV (52) and 6.76-MeV (72) states is discussed in terms of the ejection of a proton from the 1f shell in C12 and, more attractively, in terms of a two-stage process involving both the ejection of a 1p-state proton and a core excitation.

  • Received 25 August 1966

DOI:https://doi.org/10.1103/PhysRev.155.1054

©1967 American Physical Society

Authors & Affiliations

H. G. Pugh*, D. L. Hendrie, Marc Chabre, and E. Boschitz

  • Lawrence Radiation Laboratory, University of California, Berkeley, California

I. E. McCarthy

  • University of Oregon, Eugene, Oregon

  • *Present address: University of Maryland, College Park, Maryland.
  • NATO Fellow on leave from CNRS, Institute Fourier, Grenoble, France.
  • Permanent address: NASA Lewis Research Center, Cleveland, Ohio.

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Issue

Vol. 155, Iss. 4 — March 1967

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