Comment on Resonant excitation of the reaction sup 180 Ta sup m (. gamma. ,. gamma. prime ) sup 180 Ta''
Journal Article
·
· Physical Review, C (Nuclear Physics); (United States)
- Institute of Isotopes of the Hungarian Academy of Sciences, H-1525 Budapest, Pf. 77 (Hungary) Kernforschungszentrum Karlsruhe, Institut fuer Kernphysik III, D-7500 Karlsruhe (Germany)
We point out that the large integral cross section values reported for the {sup 180}Ta{sup {ital m}}({gamma},{gamma}{prime}){sup 180}Ta reaction by Collins {ital et} {ital al}. correspond to transition strengths exceeding the recommended upper limits. The small overall cross section ratio of the aforementioned and the {sup 115}In({gamma},{gamma}{prime}){sup 115}In{sup {ital m}} reactions is shown to be an indirect piece of evidence against the enormous integral cross sections. Collins {ital et} {ital al}. used the {sup 87}Sr({gamma},{gamma}{prime}){sup 87}Sr{sup {ital m}} reaction to verify their calculated photon flux, but did not identify the observed activation levels. We identify four photoactivation levels of {sup 87}Sr at 1228.42 keV, 5/2{sup +}, 1770.46 keV, 5/2{sup +}, 1919.9 keV, 7/2{sup +}, 2706.5 keV, 9/2{sup +}, and deduce the existence of (at least) a further one around 2.6 MeV. These new data suggest that the calculated photon flux used by Collins {ital et} {ital al}. should be rechecked.
- OSTI ID:
- 5080022
- Journal Information:
- Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 45:1; ISSN 0556-2813; ISSN PRVCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
663410* -- Photonuclear Reactions & Photon Scattering-- (1992-)
663570 -- Nuclear Mass Ranges-- A=150-189-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CROSS SECTIONS
ENERGY LEVELS
ENERGY RANGE
ENERGY SPECTRA
EXCITED STATES
INTEGRAL CROSS SECTIONS
MEV RANGE
MEV RANGE 01-10
NUCLEAR REACTIONS
PHOTONUCLEAR REACTIONS
SPECTRA
TANTALUM 180 TARGET
TARGETS
663570 -- Nuclear Mass Ranges-- A=150-189-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CROSS SECTIONS
ENERGY LEVELS
ENERGY RANGE
ENERGY SPECTRA
EXCITED STATES
INTEGRAL CROSS SECTIONS
MEV RANGE
MEV RANGE 01-10
NUCLEAR REACTIONS
PHOTONUCLEAR REACTIONS
SPECTRA
TANTALUM 180 TARGET
TARGETS