The (γ, n) reaction in4He nuclei

Ratio of theHe4(γ, p)andDodge1, Murphy2 1972Phys. Rev. Lett.36070View full textAdd to dashboardCite

“…The (y,n) cross section is increased by 10%. Figures 1(a) and 1(b) show pulse-height spectra used to determine the *Re(e, 3 H)e'p and 4 He(e, 3 He)e'n yields, respectively, at 31.7 MeV. The spectrometer magnetic field was programmed so that (y,/>) and (y,n) cross sections at a given photon energy were always measured within a time interval of approximately 2 h.…”

“…2 K. Shoda and collaborators (Tohoku), private communication. 3 R. Berg&re and collaborators (Saclay), private communication. 4 The equality of the 4 He(y,/>) and 4 He(y, n) total cross sections was first established by Gorbunov and Spiridonov 1 using a cloud chamber and synchroton bremsstrahlung radiation.…”

“…4 The equality of the 4 He(y,/>) and 4 He(y, n) total cross sections was first established by Gorbunov and Spiridonov 1 using a cloud chamber and synchroton bremsstrahlung radiation. Fuller's 2 4 He(y,£) 3 He data and Livesey and Main's 3 4 He(y, 3 He)« data, and later measurements of Gorbunov 1016 (1971), performed a calculation in the framework of the particle-hole model. They estimate Z7-60 MeV.…”

“…11 The use of the same apparatus to measure both the (y,p) and (y,n) cross sections avoided the errors inherent in the comparison of two independently determined absolute cross sections. We used a magnetic spectrometer to determine the 3 H and 3 He yields at 90° in the laboratory system produced by electrons incident on a gaseous 4 He target. These electrodisintegration yields were converted into 4 He(y,/>) and 4 He(y,n) cross sections.…”

“…Summary of the results of this experiment and the data for calculating o-(y,/>)/a(y,«). The angular-distribution coefficients A(k y ), B(ky) 9 and C(ky) are from Meyerhof, Suffert, and Feldman, 3 Perry and Bame, b Berman, Fultz, and Kelly, 0 and Gorbunov. d In those columns in which there are two entries, the upper entry refers to the 4 He(y,/>) reaction and the lower to the 4 He(y,w) reaction.…”