Phys. Rev. C 71, 054605 (2005) [8 pages]Evolution of the prompt dipole γ-ray emission with incident energy in fusion reactionsReceived 12 January 2005; published 26 May 2005 We investigated the prompt dipole γ-ray emission, related with entrance channel charge asymmetry effects, in the 32S+100Mo and 36S+96Mo fusion reactions at Elab=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 132Ce compound nucleus at an excitation energy of 117 MeV with identical spin distribution. Fusion events were selected by detecting high-energy γ rays in coincidence with evaporation residues. The center-of-mass differential γ-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 γ-ray emission with incident energy. Calculations based on a collective bremsstrahlung analysis of the reaction dynamics are presented and compared with the experimental findings. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.71.054605
DOI:
10.1103/PhysRevC.71.054605
PACS:
25.70.Gh, 24.30.Cz
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.