Elsevier

Nuclear Physics A

Volume 451, Issue 1, 17 March 1986, Pages 21-45
Nuclear Physics A

The separation of proton and deuteron spin-orbit distortions in the 116Sn(d, p)117Sn reaction

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Abstract

We have measured the 116Sn(d, p)117Sn differential cross section and vector analysing power at 12.22 and 15.09 MeV incident deuteron energy, and the cross section and proton analysing power in the inverse 117Sn(p, d)116Sn reaction at the same c.m. energy (16.83 and 19.75 MeV incident proton energies). We have analysed these data together with the earlier data of Cadmus on the same reaction at 8.22 MeV. We were successful in obtaining several global potentials that fit the elastic scattering of deuterons by the target nucleus and of protons by the recoil nucleus. These global potentials were used in DWBA calculations in attempts to reproduce the reaction data. In all cases they failed completely. DWBA calculations performed using a deuteron potential deduced from the adiabatic prescription of Johnson and Soper (1970) had some success.

A method proposed by Johnson (1962) was used to determine whether the proton or the deuteron potential was primarily at fault. In this method, the vector analysing power and proton polarisation in a (d, p) reaction are combined to give the quantities Sp and Sd, where Sp and Sd, each proportional to the strength of the spin-orbit potential in the channel indicated by the subscript, are independent of the spin-orbit potential in the other channel. A failure of the DWBA to reproduce Sp or Sd would reveal that the shortcomings of the model are primarily confined to one or the other of these two channels. Unfortunately, Johnson's method was not very helpful in establishing which potential is at fault as it did not provide separation of the effects due to the central potentials.

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  • Cited by (3)

    a

    Present address: University of Alberta, Alberta, Canada.

    b

    Present address: University of Bonn, West Germany.

    c

    Present address: Universite Laval, Quebec, Canada.

    d

    Present address: Princeton University, Princeton, New Jersey, USA.

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