Elsevier

Nuclear Physics A

Volume 237, Issue 3, 20 January 1975, Pages 447-464
Nuclear Physics A

Two-body photodisintegration of 3He and 4He in the Δ(1236) region

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Abstract

Differential cross sections for the reactions 3He(γ, p)d and 4He(γ, p)t were measured at proton c.m. angles of 60° and 90° for photon energies ranging from 150–450 MeV with an average resolution of 8 MeV. Bremsstrahlung was used as the photon source; deuterons/tritons were analyzed in a magnetic spectrometer whereas coincident protons were detected in a plastic scintillator telescope. The experimental method includes a calibration by means of 1H(γ, π0)p differential cross section measurement at 90° c.m. in the same photon energy range. The 3He and 4He two-body photodisintegration differential cross sections show a monotonically decreasing variation with photon energy. In addition, partial data on the differential cross section of the reaction 4He(γ, n)τ at 90° and 120° neutron c.m. angle are given.

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