Comparisons of (p,p′) and (p,n) Reaction Measurements

  • C. C. Foster


Comparison of absolute differential cross-section values for the 12C(p,p′) reaction to the T=1, 15.11 MeV (1+) and 16.11 MeV (2+) states with absolute values for their respective analog states at 0.0 and 1.0 MeV excited by the 12C(p,n)12N reaction may be used to determine neutron detection efficiencies for large volume neutron detectors at intermediate energies as reported by C. A. Goulding at this conference. In doing this, use is made of the relation1
$$ 2\frac{{d\sigma }}{{d\Omega }}(p,p') = \frac{{d\sigma }}{{d\Omega }}(p,n) $$
which holds for such analog states when isospin conservation is assumed. In the case of 12C(p,p′) and 12C(p,n) reactions careful independent determinations of neutron detection efficiencies by using the 7Li(p,n)7Be reaction2 or by Monte Carlo calculation3 have established the validity of the relation to an accuracy of ± 10%. It is now interesting to consider how well comparisons using this relation, together with the facts that the (p,n) reaction T=0 targets excite T=1 states while the (p,p′) reaction excites both T=0 and T=1 states, may be employed to study other nuclei. In order to investigate this question, 28Si(p,p′) and 28Si(p,n)28P reaction data are compared at 62 and about 120 MeV proton energies in this paper.


Neutron Detection Reaction Measurement High Excitation Energy Energy Acceptance Detector Telescope 
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Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • C. C. Foster
    • 1
  1. 1.Indiana University Cyclotron Facility Physics DepartmentIndiana UniversityBloomingtonUSA

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