Elsevier

Nuclear Physics A

Volume 569, Issues 1–2, 7 March 1994, Pages 297-302
Nuclear Physics A

Spin-isospin multipole excitations by means of the (6Li,6He) reaction at 100 A.MeV

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Abstract

The charge exchange reaction (6Li,6 He) has been investigated around 0° at 100 A.MeV on 12C, 13C, 58Ni, 90Zr and 208Pb targets. Strong selectivity for L = 0, S = 1 states in 12N and 13N nuclei is observed. Due to the finite angular opening of the spectrometer (±1.3°) the known Gamow-Teller resonances (L = 0) in 58Cu, 90Nb and 208Bi appear in the residual energy spectra superimposed on much broader structures, located at higher excitation energies, most probably related to a strong excitation of the Spin Dipole (1 ω,L = 1), Spin Quadrupole (2 ω,L = 2) and Spin Isovector Monopole (2 ω,L = 2) resonances. An attempt has been made to reproduce the excitation energy spectra up to 40 MeV, assuming that only L = 0,1 and 2 spin-multipole resonances contribute to the (6Li,6He) cross section on 58Ni, 90Zr and 208Pb targets. A very good overall fit of the spectra is obtained with the excitation energy and width parameters very close to the original values. A general trend of the (6Li,6He) reaction at 100 A.MeV is that the GT state (L = 0) contains about 6% of the cross section observed in the investigated angular range (≈5–10 mbsr), whereas the remaining 94% of the cross section is accounted for by the strong population of the (1 ω,L = 1 and (2 ω,L = 0,2) resonances.

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