Search for narrow sum-energy lines in electron-positron pair emission from heavy-ion collisions near the coulomb barrier

I. Ahmad, S. M. Austin, B. B. Back, R. R. Betts, F. P. Calaprice, K. C. Chan, A. Chishti, P. Chowdhury, 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. 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

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Abstract

The first results are presented from a new experiment, APEX, designed to study the previously reported sharp lines in sum-energy spectra of positrons and electrons produced in collisions of very heavy ions. Data were collected for 238U +181Ta at 5.95, 6.10, and 6.30 MeV/u and 238U +232Th at 5.95 MeV/u. In none of our analyses is any evidence found for sharp sum-energy lines. For the specific case of the isolated decay of a neutral particle of mass 1.4-2.1 MeV/ c2, the upper limits on cross sections obtained from the present data are significantly less than the previously reported cross sections.

Original languageEnglish (US)
Pages (from-to)2658-2661
Number of pages4
JournalPhysical review letters
Volume75
Issue number14
DOIs
StatePublished - Jan 1 1995

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., Chowdhury, P., 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., ... Yurkon, J. E. (1995). Search for narrow sum-energy lines in electron-positron pair emission from heavy-ion collisions near the coulomb barrier. Physical review letters, 75(14), 2658-2661. https://doi.org/10.1103/PhysRevLett.75.2658