40. (γ, p)-reactions with formation of products in the ground state

✍ Scribed by V.I. Goldansky

• Publisher: Elsevier Science
• Year: 1956
• Weight: 66 KB
• Volume: 22
• Category: Article
• ISSN: 0031-8914
• DOI: 10.1016/s0031-8914(56)90107-0

✦ Synopsis

Emax = 30 MeV, 42 MeV, 60 MeV and 80 MeV have been studied by the nuclear emulsion technique. The plates have been located in the vacuum chamber at 15 ° , 30 ° , 45 °, 60 °, 75 °, 90 °, 120 °, 150 ° with respect to the r-ray beam. Two thousand tracks have been selected at every angle. The angular and energy distributions of photoprotons allow to make some conclusions about the interaction of r-rays with light nuclei.

The angular distributions can be well approximated by a q-b sin 2 0(1 q-cos 0) 3 and accounted for by the direct interaction of F-rays with individual nucleons of the nucleus.

The analysis of the angular distributions shows that the fraction of the E2 absorption increases from 5% to 11% in the case of 12C and from 15% to 20% in the case of 9Be.

The energy distribution indicates that transitions into the "parent" states of the residual nucleus seem to play an important part in the direct photoeffect.

The results obtained for Emax = 68, 84 and 88 MeV suggest the existence in this energy region of a double nucleon mechanism of r-ray interaction with nuclei.