Evolution of the prompt dipole {gamma}-ray emission with incident energy in fusion reactions

Journal Article · Sun May 01 04:00:00 EDT 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.71.054605· OSTI ID:20698679

Pierroutsakou, D; Martin, B; Inglima, G; Boiano, A; De Rosa, A; Di Pietro, M; La Commara, M; Mordente, R; Romoli, M; Sandoli, M; Trotta, M; Vardaci, E; Glodariu, T; Mazzocco, M; Signorini, C; Stroe, L; Baran, V; Colonna, M; Di Toro, M; Pellegriti, N ^[1]

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1. INFN, Sezione di Napoli and Dipartimento di Scienze Fisiche, Universita di Napoli 'Federico II', Naples (Italy)

We investigated the prompt dipole {gamma}-ray emission, related with entrance channel charge asymmetry effects, in the {sup 32}S+{sup 100}Mo and {sup 36}S+{sup 96}Mo fusion reactions at E{sub lab}=196 MeV and 214.2 MeV, respectively, with the aim to probe its evolution with incident energy. These reactions populate, through entrance channels having different charge asymmetries, the {sup 132}Ce compound nucleus at an excitation energy of 117 MeV with identical spin distribution. Fusion events were selected by detecting high-energy {gamma} rays in coincidence with evaporation residues. The center-of-mass differential {gamma}-ray multiplicity spectra of the considered reactions were found to be identical within the experimental uncertainties in the whole energy range. This result, associated with that reported for the same reaction pair at higher beam energy where a larger giant dipole resonance yield was evidenced for the more charge asymmetric system, implies an increasing trend of the prompt dipole {gamma}-ray emission with incident energy. Calculations based on a collective bremsstrahlung analysis of the reaction dynamics are presented and compared with the experimental findings.

• OSTI ID: 20698679
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 71; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASYMMETRY
BREMSSTRAHLUNG
CERIUM 132
COMPOUND NUCLEI
DIPOLES
DISTRIBUTION
EXCITATION
GAMMA RADIATION
GIANT RESONANCE
MEV RANGE
MOLYBDENUM 100 TARGET
MOLYBDENUM 96 TARGET
MULTIPLICITY
NUCLEAR REACTION YIELD
PHOTON EMISSION
SPIN
SULFUR 32 REACTIONS
SULFUR 36 REACTIONS