States in C12 Between 16.4 and 19.6 MeV

R. E. Segel, S. S. Hanna, and R. G. Allas
Phys. Rev. 139, B818 – Published 23 August 1965
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Abstract

The states of C12 in the energy region 16.4 MeV<Ex(C12*)<19.6 MeV have been studied by bombarding B11 with protons in the range 0.5 MeV<Ep<4.0 MeV. Many angular distributions and yield curves were measured for the capture gamma rays forming the ground state and first excited state of C12 and for the alpha-particle transitions to the ground state and first excited state of Be8. The total-neutron-yield curve was determined by measuring the yield of residual C11 activity. The absolute inelastic proton-scattering cross section was also determined and used to normalize the relative-yield curve of other investigators. The elastic proton scattering was measured as a function of energy at several angles. Some γγ angular-correlation measurements were made at one resonance. In all, nine distinct resonances were studied and given spin, parity, and isospin assignments with varying degrees of completeness. In most cases in which earlier assignments had been made, these assignments were confirmed. The observed levels are compared with those predicted by particle-hole calculations. It is concluded that the particle-hole model is consistent with most of the observed structure, and that all of the predicted levels in this region have been at least tentatively identified.

  • Received 7 April 1965

DOI:https://doi.org/10.1103/PhysRev.139.B818

©1965 American Physical Society

Authors & Affiliations

R. E. Segel, S. S. Hanna*, and R. G. Allas

  • Argonne National Laboratory, Argonne, Illinois

  • *Present address: Stanford University, Stanford, California.
  • Present address: U. S. Naval Research Laboratory, Washington, D. C.

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Issue

Vol. 139, Iss. 4B — August 1965

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