TY - JOUR
T1 - Isovector correlations and pion single charge exchange reactions in light nuclei
AU - Warszawski, J.
AU - Gal, A.
AU - Eisenberg, J. M.
PY - 1978/1/16
Y1 - 1978/1/16
N2 - The reactions 7Li(π+, π0)7Be(g.s.), 7Li(π+, π0)7Be*(429keV) and 13C(π+, π0)13N(g.s.) are treated in DWIA, including corrections arising from two-step processes in which an intermediate state is reached in the course of the charge exchange. The distortions are introduced by means of a first-order optical potential; no special assumptions of extreme high energy limits are made. The closure sum over intermediate states in the two-step charge exchange mechanism leads to an isovector two-particle correlation function whose properties for p-shell nuclei are discussed in detail. Consequences of the introduction of effective transition operators for the single-step mechanism, with and without spin-flip, and for the two-step contribution are discussed, as are the allowable modifications in nuclear shell radii consistent with present knowledge of Coulomb energies. Comparison is made with experiment - in the case of the separated 7Be states, for the first time - and with other theoretical approaches.
AB - The reactions 7Li(π+, π0)7Be(g.s.), 7Li(π+, π0)7Be*(429keV) and 13C(π+, π0)13N(g.s.) are treated in DWIA, including corrections arising from two-step processes in which an intermediate state is reached in the course of the charge exchange. The distortions are introduced by means of a first-order optical potential; no special assumptions of extreme high energy limits are made. The closure sum over intermediate states in the two-step charge exchange mechanism leads to an isovector two-particle correlation function whose properties for p-shell nuclei are discussed in detail. Consequences of the introduction of effective transition operators for the single-step mechanism, with and without spin-flip, and for the two-step contribution are discussed, as are the allowable modifications in nuclear shell radii consistent with present knowledge of Coulomb energies. Comparison is made with experiment - in the case of the separated 7Be states, for the first time - and with other theoretical approaches.
UR - http://www.scopus.com/inward/record.url?scp=49349118233&partnerID=8YFLogxK
U2 - 10.1016/0375-9474(78)90221-X
DO - 10.1016/0375-9474(78)90221-X
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AN - SCOPUS:49349118233
SN - 0375-9474
VL - 294
SP - 321
EP - 347
JO - Nuclear Physics A
JF - Nuclear Physics A
IS - 3
ER -