Dilepton decay from excited states in 28Si populated via different isospin entrance channels

A. Buda, J. C. Bacelar, A. Bałanda, A. Krasznahorkay, H. Van Der Ploeg, Z. Sujkowski, A. Van Der Woude

Research output: Contribution to journalArticle

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Abstract

Nuclear states in 28Si, with an initial excitation energy E* = 50 MeV, were populated via the isospin T = 0 reaction 4He+24Mg and the mixed-isospin 3He+25Mg reaction. In both reactions the dilepton (e+e-) and photon decay yields were measured concurrently, up to transition energies of 30 MeV. Both the dilepton and the photon yields are well described by a modified version of the statistical decay model, which includes both the photon and dilepton decays of giant resonances built on excited nuclear states. An excess of counts in the e+e- spectrum, over the converted photon yield, is observed in the energy region 17-22 MeV in the 3He induced reaction, possibly indicating an entrance channel effect.

Original languageEnglish
Pages (from-to)157-167
Number of pages11
JournalPhysical Review C - Nuclear Physics
Volume53
Issue number1
DOIs
Publication statusPublished - Jan 1996

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entrances
photons
decay
excitation
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ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics

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Dilepton decay from excited states in 28Si populated via different isospin entrance channels. / Buda, A.; Bacelar, J. C.; Bałanda, A.; Krasznahorkay, A.; Van Der Ploeg, H.; Sujkowski, Z.; Van Der Woude, A.

In: Physical Review C - Nuclear Physics, Vol. 53, No. 1, 01.1996, p. 157-167.

Research output: Contribution to journalArticle

Buda, A, Bacelar, JC, Bałanda, A, Krasznahorkay, A, Van Der Ploeg, H, Sujkowski, Z & Van Der Woude, A 1996, 'Dilepton decay from excited states in 28Si populated via different isospin entrance channels', Physical Review C - Nuclear Physics, vol. 53, no. 1, pp. 157-167. https://doi.org/10.1103/PhysRevC.53.157
Buda, A. ; Bacelar, J. C. ; Bałanda, A. ; Krasznahorkay, A. ; Van Der Ploeg, H. ; Sujkowski, Z. ; Van Der Woude, A. / Dilepton decay from excited states in 28Si populated via different isospin entrance channels. In: Physical Review C - Nuclear Physics. 1996 ; Vol. 53, No. 1. pp. 157-167.
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AB - Nuclear states in 28Si, with an initial excitation energy E* = 50 MeV, were populated via the isospin T = 0 reaction 4He+24Mg and the mixed-isospin 3He+25Mg reaction. In both reactions the dilepton (e+e-) and photon decay yields were measured concurrently, up to transition energies of 30 MeV. Both the dilepton and the photon yields are well described by a modified version of the statistical decay model, which includes both the photon and dilepton decays of giant resonances built on excited nuclear states. An excess of counts in the e+e- spectrum, over the converted photon yield, is observed in the energy region 17-22 MeV in the 3He induced reaction, possibly indicating an entrance channel effect.

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