Quasideuteron mechanism and the photodisintegration of He4 at intermediate energies

C. T. Noguchi and F. Prats
Phys. Rev. C 14, 1133 – Published 1 September 1976
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Abstract

The He4(γ,p)H3 and He4(γ,n)He3 reactions from Eγ60 MeV to Eγ170 MeV are considered, along with the He4(γ,pnd) reaction from threshold up to intermediate energies. The absorption of photons in the intermediate energy range up to pion threshold is expected to occur predominantly via the quasideuteron mechanism as is indicated from the reaction He4(γ,pnd). For the (γ,pnd) amplitude, the breakup of He4 into a deuteron and quasideuteron is calculated using a He4 Gaussian ground-state wave function fitted to the form factor, a quasideuteron S-wave scattered state, and a deuteron effective range wave function. The photobreakup of the quasideuteron can be expressed in terms of the amplitude for the photobreakup of the deuteron as shown by Levinger. The photoamplitude for the (γ,pnd) reaction is used to obtain the photoamplitude for the (γ,n) and (γ,p) reactions. The contribution to the (γ,p) and (γ,n) reactions from the quasideuteron mechanism is calculated as a rescattering of a nucleon-deuteron pair to form a triton. For both nucleon-triton reactions, this yields angular distributions with forward peaking in agreement with the forward asymmetry obtained experimentally. The cross section at intermediate energy appears to be dominated by the quasideuteron effect. Finally, the alternative quasideuteron calculation using nucleon-nucleon short-range correlations is shown to be equivalent to the present quasideuteron calculation.

NUCLEAR REACTIONS He4(γ,pnd), He4(γ,p), He4(γ,n); calculated σ(Eγ), dσdΩN (Eγ=60170 MeV), quasideuteron mechanism.

  • Received 10 June 1976

DOI:https://doi.org/10.1103/PhysRevC.14.1133

©1976 American Physical Society

Authors & Affiliations

C. T. Noguchi* and F. Prats

  • Department of Physics, The George Washington University, Washington, D.C. 20052

  • *National Science Foundation Predoctoral Trainee 1970-1974. Present address: Laboratory of Chemical Biology, NIAMDD, National Institutes of Health, 9000 Rockville Pike, Bldg. 10, Rm. 9N307, Bethesda, Maryland 20014.

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Vol. 14, Iss. 3 — September 1976

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