Energy dependence of low-energy pion double-charge-exchange on the calcium isotopes

M. J. Leitch, H. W. Baer, A. Klein, C. S. Mishra, Z. Weinfeld, E. Piasetzky, Y. Ezra, R. Weiss, C. Allgower, J. R. Comfort, J. Tinsley, D. H. Wright

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Abstract

The forward angle differential cross sections of (π+, π-) reactions on the calcium isotopes to the double-isobaric-analog (DIAS) and ground states (GS) were measured between 25 and 65 MeV. These low-energy cross sections are up to an order of magnitude larger than those at resonance energies. The forward-angle excitation functions of 42Ca, 44Ca DIAS and 44Ca GS transitions peak around 50 MeV. The 48Ca DIAS cross section exhibits a minimum at about 50 MeV and that for the GS has a peak which is shifted to lower energy with a smaller cross section than that of the other nuclei. The observed behaviour is inconsistent with theoretical expectations.

Original languageEnglish (US)
Pages (from-to)157-161
Number of pages5
JournalPhysics Letters B
Volume294
Issue number2
DOIs
StatePublished - Nov 12 1992

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Leitch, M. J., Baer, H. W., Klein, A., Mishra, C. S., Weinfeld, Z., Piasetzky, E., Ezra, Y., Weiss, R., Allgower, C., Comfort, J. R., Tinsley, J., & Wright, D. H. (1992). Energy dependence of low-energy pion double-charge-exchange on the calcium isotopes. Physics Letters B, 294(2), 157-161. https://doi.org/10.1016/0370-2693(92)90676-U