Isomeric yield ratios and excitation functions in. alpha. -induced reactions on sup 107,109 Ag

Journal Article · Wed Jul 01 04:00:00 EDT 1992 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.46.250· OSTI ID:7277204

Guin, R; Saha, S K ^[1]; Prakash, S ^[2]; Uhl, M ^[3]

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1. Radiochemistry Division, Bhabha Atomic Research Centre, Variable Energy Cyclotron Centre, I/AF Bidhan Nagar, Calcutta-700 064 (India)
2. Radiochemistry Division, Bhabha Atomic Research Centre, Bombay-400 085 (India)
3. Institut fuer Radiumforschung und Kernphysik, Universitaet Wien, A-1090 Vienna (Austria)

Isomeric yield ratios for the reactions {sup 107}Ag({alpha},3{ital n}){sup 108}In, {sup 107}Ag({alpha},{alpha}3{ital n}){sup 104}Ag, {sup 109}Ag({alpha},2{ital n}){sup 111}In, and {sup 109}Ag({alpha},3{ital n}){sup 110}In are determined in the energy range of 20--63 MeV {alpha} particles. Excitation functions for the above reactions as well as for the {sup 107}Ag({alpha},2{ital n}){sup 109}In, {sup 107}Ag({alpha},{alpha}2{ital n}){sup 105}Ag, {sup 109}Ag({alpha},4{ital n}){sup 109}In, {sup 109}Ag({alpha},5{ital n}){sup 108}In, and {sup 109}Ag({alpha},{alpha}4{ital n}){sup 105}Ag reactions are also presented. Experimental excitation functions are compared with statistical model calculations taking into account precompound particle emission. Isomeric yield ratios are found to depend strongly on the root mean square orbital angular momentum in the entrance channel. A semiempirical method for the prediction of isomeric yield ratios failed to reproduce experimental data even for compoundlike reactions. Isomeric yield ratios were also calculated in the frame of a statistical model under consideration of angular momentum effects in the preequilibrium and the equilibrium stage. Overall agreement between the theory and the experiment for isomeric yield ratios was found to be satisfactory especially at low bombarding energy when compound nucleus reaction channel is dominant. The discrepancy observed at higher bombarding energies needs to be theoretically investigated in greater detail.

• OSTI ID: 7277204
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 46:1; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

663440* -- D-
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& He-induced Reactions & Scattering-- (1992-)
663560 -- Nuclear Mass Ranges-- A=90-149-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA REACTIONS
BARYONS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DIRECT REACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
EXCITATION FUNCTIONS
FERMIONS
FUNCTIONS
GAMMA SPECTROSCOPY
HADRONS
INDIUM ISOTOPES
ISOMERIC NUCLEI
ISOTOPES
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
SILVER 107 TARGET
SILVER 109 TARGET
SPECTROSCOPY
STATISTICAL MODELS
TARGETS
TOTAL CROSS SECTIONS
TRANSFER REACTIONS