Photoneutron Cross Sections in He, N, O, F, Ne, and A

Two-body photodisintegration ofHe4with full final state interaction

“…The photodisintegration of the 4 He nucleus has a longstanding history. First experiments on the (γ, n) reaction were performed some 50 years ago [1]. In the following 25 years various experimental groups carried out measurements for both the 4 He(γ, p) 3 H and 4 He(γ, n) 3 He reaction channels and the inverse capture reactions [2,3,4,5,6,7,8,9,10,11,12,13,14,15].…”

Photoneutrons from Natural Magnesium

“…The yield curves werecorrected for background due to the 160(y, n) reaction using the results of Ferguson et al (1954), and were analysed for the cross section by the total spectrum method. The 24Mg(y, n) peak cross section (9 mbarn) agreed with the original residual activity result of Katz and Cameron (1951b) (9·8 mbarn),.…”

THE GAMMA-NEUTRON CROSS SECTION FOR F19

“…The theory of the splitting of the giant resonance for deformed nuclei, as developed by Danos (1958) and Okamoto (1958), applies to the total photon absorption cross section. Ferguson et al (1954) have measured the sum of the (y,n), (y,np), and (y,2n) reactions in F19 by direct detection of the neutrons emitted. Normalization of the (y,n) cross section to their cross section shows that there is an appreciable (y,np) contribution to the total cross section above 17 Mev; there is also a small (y,2n) contributio~~ above 19.6 NIev (Horsley et al 1952).…”