CROSS SECTION FOR THE REACTION Be⁹(γ, p)Li⁸

Abstract

The reaction Be9(γ, p)Li8has been investigated by detecting the 0.88 sec. Li8 β-activity, by the use of a cycling apparatus which allows intermittent operation of the betatron, counting taking place during the periods of no X-ray yield. The cross section for the reaction has a peak value of 2.72 mbarns at 22.2 Mev., a half-width of 4.7 Mev., and the integrated cross section to 26 Mev. is 0.013 Mev-barns.

General Technique of Quasielastic Spectrum Study: Application toBe9

“…In our experiments (Fig. 13) we did not see any resonance similar to the one observed in the reactions 39,40 Be 9 (7^)Be 8 or Be 9 (7^)Li 8 .…”

The Photoneutron Cross Section of 9Be in the Intermediate Energy Range

“…These authors found a peak of height 3 mbarn at 22 MeV in the cross section derived from the yield of photoneutrons. If the 2·7 m barn found by Haslam et al (1953) for the peak cross section of the 22 MeV resonance of the 9Be(y, p) reaction is added to the 3 mbarn noted above, we may give 5·7 mbarn as the height of the 22 MeV giant resonance of 9Be. This giant resonance is considered to be due to electric dipole transitions.…”

Alpha particles from the photodisintegration of 9Be in the photon energy region 18 to 26 MeV

“…This yield is composed of yields from both the (y,ao) and (y,n)'Be(16.6) reactions, i.e., where (JT = Oa0 + 016. 6 and 51 is the efficiency factor (18). Similar yields were found for the three other bremsstrahlung endpoint energies.…”

“…The photoproton rneas~lrements of Haslam et a/. (6) and Clikernan et a/. (7) were obtained by ~iieasuring the induced beta activity of 'Li and colisequently excluded any (y,np/pn) contribution.…”