Polarized deformed spin projectile scattering and complex folded potentials |
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Authors: | D Mukhopadhyay G Grawert |
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Institution: | Fachbereich Physik, Philipps-Universität, 3550 Marburg, W. Germany |
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Abstract: | A formalism is presented where polarization observables of all ranks for deformed spin ? projectiles are calculated in a parameter-free fashion. Complex optical potentials for the available 7 + 58Ni elastic scattering data at Elab = 20.3 MeV are obtained from single folding calculations, taking the 7Li ground state to be an α + t cluster in relative p-state. The expansion of the hamiltonian in spin-space generates tensor terms of ranks 2 (TR) and 3 (T3) apart from the usual central and spin-orbit terms. The TR potential fits the second-rank tensor analysing powers quite well without being able to resolve discrete ambiguities of input optical parameters. The T3 term generates a J · L contribution, making the spin-orbit interaction three-component. The 7Li vector analysing power so obtained is negative, but the magnitude is not fully reproduced. Modification of parameters to account for absorption modes not included in the superposition model indicates the need for properly handling dynamical polarization effects due in particular to the low-lying first excited state of 7Li. |
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