Abstract
The inclusive C 12 ( d → , He 2 ) and exclusive C 12 ( d → , He 2 + n ) reactions have been studied with a beam energy of 171 MeV and scattering angles for the ( d , He 2 ) reaction θ = 0 ° and 3°. The studies focused on the separation of the isovector spin-dipole resonance (IVSGDR) into its components by measuring tensor-analysing powers and observing the direct neutron decay to the low-lying proton-hole states in 11 B. Merging the information obtained from both measurements resulted in the first-time verification of model-independent predictions of tensor-analysing powers at extreme forward angles and the experimental decomposition of the IVSGDR into its J π components. The experimental results are in reasonable agreement with theoretical estimates based on shell-model calculations.
Highlights
In the past years, many experiments have been dedicated to the investigation of Gamow–Teller (GT) transitions in atomic nuclei
The characteristics of a GT transition is given by a change of the nuclear spin S and the nuclear isospin I by one unit, i.e. ΔS = ΔI = 1, and no orbital angular momentum transfer, ΔL = 0
In comparison to GT transitions, experimental studies of the higher multipole spin–isospin excitations are more involved because the associated transitions are shifted to higher excitation energies and the strength distributions are more spread
Summary
Many experiments have been dedicated to the investigation of Gamow–Teller (GT) transitions in atomic nuclei. The validity of the background approximation by a quasi-free continuum has been checked by comparing with the cross sections measured in coincidence with decay neutrons detected at backward angles. To extract angular distributions of cross sections and analysing powers, the excitation-energy spectra between Ex = 3.0–5.4 MeV were fitted using the code FIT [29].
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