Internal pair conversion in heavy nuclei

I. Ahmad, S. M. Austin, B. B. Back, R. R. Betts, F. P. Calaprice, K. C. Chan, A. A. Chishti, C. Conner, R. W. Dunford, J. D. Fox, S. J. Freedman, M. Freer, J. S. Greenberg, S. B. Gazes, A. L. Hallin, T. Happ, D. Henderson, N. I. Kaloskamis, E. Kashy, W. KutscheraJ. Last, C. J. Lister, M. Liu, M. R. Maier, D. J. Mercer, D. Mikolas, P. A.A. Perera, M. D. Rhein, D. E. Roa, J. P. Schiffer, T. A. Trainor, P. Wilt, J. S. Winfield, M. Wolanski, F. L.H. Wolfs, A. H. Wuosmaa, G. Xu, A. Young, J. E. Yurkon

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Positrons and electrons from the internal pair conversion (IPC) decay of states populated in near-barrier collisions of very heavy ions have been studied using the APEX spectrometer. Using inelastic [Formula Presented] scattering at 5.90 MeV/nucleon, the gamma and IPC branches of the well-known [Formula Presented] decay of the first [Formula Presented] state were kinematically reconstructed and the IPC-to-gamma branching ratio was determined to be [Formula Presented]. We have also performed experiments with actinide beams or targets; [Formula Presented], [Formula Presented], [Formula Presented], and [Formula Presented], which resulted in the observation of new gamma-ray transitions from high-lying states in [Formula Presented] and [Formula Presented]. None of these were populated with sufficient strength such that IPC could produce statistically significantly peaks in positron-electron sum energy spectra.

Original languageEnglish (US)
Pages (from-to)R2755-R2759
JournalPhysical Review C - Nuclear Physics
Issue number6
StatePublished - 1997

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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