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- W3146022704 abstract "In a previous paper (1) it was pointed out that spin-dependent effects, which in muon capture on doubly-closed-shell nuclei act as a reduction factor for the axial mat r ix elements relative to the vector ones (M]/M~< 1), have by no means the same behaviour in other reactions exciting the giant-resonance analogue states of doublyclosed-shell nuclei. Some numerical estimates are given here in the particle-hole framework, especially for muou capture, photoproduetion of charged pion and scattering of pious on 160. Comments are made for neutrino-induced reactions and radiative pion capture. W e note that, in order to have M ~ / M ~ 1 in muon capture, we have to use a repulsive Bartlett potential which may be justifie4 by calculations of binding energies of closedshell nuclei by MILLV, a and G~E]~ (2), where the Bartlet t potential is given predominant ly by r exchange. Tensor-potential effects have been calculated by WALK]~R (a) and are shown to play a minor role (10% relative to the Bartlet t potential effects). Furthermore, WAL~:Ea has shown that the spin-orbit potential gives a vanishingly small contribution to a change in M~/M~ when the sum over all the excited states has been performed. Evidence for giant-resonance excitation in muon capture on doubly-closed-shell nuclei is now a well-accepted fact that is confirmed by several experimental data. For example, evidence for giant-resonance excitation in muon capture was found by IGo K ] ~ N v . s et at. (4) by using 4~ as a target. An important conclusion of this experiment is that there are axial excitations higher in energy than the vector ones. This is a typically SU~-breaking effect which has been discussed in ref. (~). This enhancement of the axial excitation energies, since M~, M] are proportional in the dipole approximation to v 4, v being the energy of the outgoing neutrino, gives the relation M]/M~ < 1, which is" @default.
- W3146022704 created "2021-04-13" @default.
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- W3146022704 date "2007-01-01" @default.
- W3146022704 modified "2023-10-18" @default.
- W3146022704 title "Spin-Dependent Effects in Giant-Resonance Excitation of Doubly-Closed-Shell Nuclei" @default.
- W3146022704 hasPublicationYear "2007" @default.
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