The ( He, t) charge-exchange reaction has been studied at E( He)=200 MeV and angles near 0 on targets of "Sn and Sn. Fragmentation of the giant Gamow-Teller resonance into separate components of the particle-hole type has been observed in good agreement with theoretical predictions. These components are connected with what is usually referred to in the literature as direct-, core-poLarization-, and back-spin-Bip Gamow-Teller strength. The observed cross sections near 0 = 0' suggest contributions from the isovector spin-Hip interaction as well as the isovector tensor interaction. A theoretically predicted configuration splitting of the main Gamow-Teller component into two components involving the lhiii2 neutron orbital could not uniquely be identified. The data are compatible, though, with such a splitting since the observed widths of the main Gamow-Teller components in Sb and Sb exceed the predicted splittings. PACS number(s): 25.55.Kr, 24.30.Cz, 27.60. +j
Spin-isospin excitations inBi have been investigated using the Pb( He, t) Bi reaction at and near 6 -0' at R( He)=450 MeV. The microscopic structure of the Gamow-Teller resonance (GTR), the isobaric analog state (IAS), and the spin-Hip dipole (AL = 1) resonance (SDR) in Bi has been studied by observing their direct proton decays to the low-lying neutron-hole states in Pb. Decay protons were measured at backward angles in coincidence with tritons detected at and near O'. The total branching ratio for proton decay from the GTR is determined to be only 4.9+1.370. The total branching ratio for proton decay from the SDR amounts to 14.1+4.2'FD. The deduced total widths as well as the total and partial proton escape widths of the GTR and IAS are found to be in reasonable agreement with recent theoretical estimates obtained in the framework of the continuum Tamm-Dancoff approximation.PACS number(s): 24.30. Cz, 25.55.Kr, 27.80.+w, 29.30.Aj
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