Search for monoenergetic positron emission from heavy-ion collisions at coulomb-barrier energies

I. Ahmad, Sam M. Austin, B. B. Back, R. R. Betts, F. P. Calaprice, K. C. Chan, A. Chishti, C. Conner, R. W. Dunford, J. D. Fox, S. J. Freedman, M. Freer, S. B. Gazes, A. L. Hallin, T. Happ, D. Henderson, N. I. Kaloskamis, E. Kashy, W. Kutschera, J. LastC. 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. R. Wolanski, F. L.H. Wolfs, A. H. Wuosmaa, G. Xu, A. Young, J. E. Yurkon

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Abstract

Positron production in 238U + 232Th and 238U + 181Ta collisions near the Coulomb barrier has been studied. Earlier experiments reported narrow lines in the spectra of positrons, accumulated without the requirement of electrons detected in coincidence. No evidence of such structure is observed in the present data. The positron energy spectra are compared with estimates from dynamic atomic processes, and from internal pair conversion of electromagnetic transitions from the excited nuclei.

Original languageEnglish (US)
Pages (from-to)618-621
Number of pages4
JournalPhysical review letters
Volume78
Issue number4
DOIs
StatePublished - Jan 27 1997

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Ahmad, I., Austin, S. M., Back, B. B., Betts, R. R., Calaprice, F. P., Chan, K. C., Chishti, A., Conner, C., Dunford, R. W., Fox, J. D., Freedman, S. J., Freer, M., Gazes, S. B., Hallin, A. L., Happ, T., Henderson, D., Kaloskamis, N. I., Kashy, E., Kutschera, W., ... Yurkon, J. E. (1997). Search for monoenergetic positron emission from heavy-ion collisions at coulomb-barrier energies. Physical review letters, 78(4), 618-621. https://doi.org/10.1103/PhysRevLett.78.618