Average angular momentum in compound nucleus reactions deduced from isomer ratio measurements

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.55.766· OSTI ID:450499

Capurro, O A; DiGregorio, D E; Gil, S; Abriola, D; di Tada, M; Fernandez Niello, J O; Macchiavelli, A O; Marti, G V; Pacheco, A J; Testoni, J E; Tomasi, D; Urteaga, I ^[1]

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1. Laboratorio TANDAR, Departamento de Fisica, Comision Nacional de Energia Atomica, Av. del Libertador 8250, 1429 Buenos Aires (Argentina)

We have measured the ratio of the yields for the metastable and ground states of {sup 119}Te produced in the fusion-evaporation reactions {sup 110}Pd({sup 12}C,3n) and {sup 115}In({sup 7}Li,3n) by off-line observation of delayed {gamma}-ray emission. The absolute cross sections for the formation of the metastable (J{sup {pi}} = 11/2{sup {minus}}, T{sub 1/2} = 4.68 d) and ground (J{sup {pi}} = 1/2{sup +}, T{sub 1/2} = 16.05 h) states were determined at energies close to the Coulomb barrier for both systems. We have deduced the average angular momentum from these isomer ratio measurements through statistical model calculations. The deduced mean angular momentum agrees quite well with those calculated by a simple fusion model. The expected constant value of the average total angular momentum at subbarrier energies was confirmed for the {sup 12}C+{sup 110}Pd system. The predicted variation of the mean orbital angular momentum with the reduced mass of the entrance channel was also verified. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 450499
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 2 Vol. 55; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANGULAR MOMENTUM
CARBON 12 REACTIONS
COMPOUND NUCLEI
CROSS SECTIONS
EVAPORATION
GAMMA RADIATION
GROUND STATES
HEAVY ION FUSION REACTIONS
INDIUM 115 TARGET
ISOMER RATIO
ISOMERIC NUCLEI
LITHIUM 7 REACTIONS
PALLADIUM 110 TARGET
STATISTICAL MODELS
TELLURIUM 119