PHOTOALPHA REACTION IN Sb$sup 12$$sup 1$
The Sb/sup 121/( gamma , alpha )In/sup 117//sup -11//sup 7m/ reactio n has been studied by determining the radioactivities of the product nuclei in samples that were irradiated with bremsstrahlung of maximum energy varying from 15.5 to 24 Mev. Excitation functions for the total cross section and the cross sections to each isomer were obtained. The total cross section rises steadily over the energy range studied, reaching a value of 360 mu b at 24 Mev. The ratio of the cross section for the direct production of the ground state to the cross section for the production of the isomer is constant over the energy range studied at a value of 2.60 plus or minus 0.40. The total excitation function up to 18 Mev agrees well with cross sections calculated on the basis of a statistical theory for compoundnucleus decay. The cross-section predictions could not be made for higher energies. The observed ground-state-toisomer cross- section ratio is consistent with that expected from a compound-nucleus mechanism and probably inconsistent with that expected from a direct mechanism. Thus, the reaction appears to involve compound-nucleus processes for the most part. (auth)
- Research Organization:
- Univ. of Illinois, Urbana
- NSA Number:
- NSA-15-026963
- OSTI ID:
- 4839775
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 123; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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