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Isomeric ratios of the yields of the reactions /sup 197/Au(. gamma. ,n)/sup 196m/,gAu and /sup 197/Au(e,e'n)/sup 196m/,gAu at energies10--90 MeV

Journal Article · · Sov. J. Nucl. Phys. (Engl. Transl.); (United States)
OSTI ID:5699488
; ; ;
Isomeric ratios of the yields of the (..gamma..,n) and (e,e'n) reactions have been measured by an activation method in the nuclei /sup 197/Au with formation of high-spin states (J/sup ..pi../ = 12/sup -/) of /sup 196/Au. The dependence obtained for the isomeric ratio for (..gamma..,n) reactions kappa-cur-bar/sub ..gamma../ on E/sub gammamax/ has the form of a saturation curve. In the saturation region the value is kappa-cur-bar/sub ..gamma../ = (6.1 +- 0.4) x 10/sup -4/. Analysis of the dependence kappa-cur-bar/sub ..gamma../(E/sub gammamax/) permits the hypothesis that for the (..gamma..,n) reaction the formation of this state has a threshold approx.12 MeV. The isomeric ratios kappa-cur-bar/sub e/ for the (e,e'n) reaction exceed the values of kappa-cur-bar/sub ..gamma../. This fact enabled us to conclude that there is an appreciable contribution to excitation of the high-spin state from the isovector quadrupole E2 resonance, which is in good agreement with estimates based on a simple model. However, the principal role in population of the isomeric state apparently belongs to cascade ..gamma.. transitions.
Research Organization:
Nuclear Research Institute, USSR Academy of Sciences
OSTI ID:
5699488
Journal Information:
Sov. J. Nucl. Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Nucl. Phys. (Engl. Transl.); (United States) Vol. 33:3; ISSN SJNCA
Country of Publication:
United States
Language:
English

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Related Subjects

651925* -- Nuclear Properties & Reactions
A=190-219
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
DAYS LIVING RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
ELECTRON REACTIONS
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXCITATION
FERMIONS
GOLD 196
GOLD 197 TARGET
GOLD ISOTOPES
HADRONS
HEAVY NUCLEI
HIGH SPIN STATES
HOURS LIVING RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOMERIC TRANSITIONS
ISOTOPES
LEPTON REACTIONS
MEV RANGE
MEV RANGE 10-100
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
ODD-ODD NUCLEI
PHOTONUCLEAR REACTIONS
QUADRUPOLE MOMENTS
RADIOISOTOPES
TARGETS