Quasideuteron mechanism and the photodisintegration of 4He at intermediate energies

Details Quasideuteron mechanism and the photodisintegration of 4He at intermediate energies Quasideuteron mechanism and the photodisintegration of 4He at intermediate energies

Sep 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976phrvc..14.1133n&link_type=abstract

Physical Review C (Nuclear Physics), Volume 14, Issue 3, September 1976, pp.1133-1140

Physics

Nuclear Physics

6

Scientific paper

The 4He(γ,p)3H and 4He(γ,n)3He reactions from Eγ>~60 MeV to Eγ<~170 MeV are considered, along with the 4He(γ, p n d) 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 4He(γ,p n d). For the (γ,p n d) amplitude, the breakup of 4He into a deuteron and quasideuteron is calculated using a 4He 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,p n d) 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 4He(γ,pnd), 4He(γ,p), 4He(γ ,n); calculated σ(Eγ), dσdΩN (Eγ=60-170 MeV), quasideuteron mechanism.

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