Title: Studies of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi></mml:math>Dependence in Neutron Pickup Reactions
Abstract: The dependence of the form of angular distributions on the total angular momentum transfer ($J$ dependence) has been studied for the following reactions: ${\mathrm{Fe}}^{56}(p, d){\mathrm{Fe}}^{55}$ at 18.5, 20.0, 22.4, 25.7, and 27.5 MeV; ${\mathrm{Ni}}^{58}(p, d){\mathrm{Ni}}^{57}$ at 20.0, 25.4, and 27.5 MeV; ${\mathrm{C}}^{12}(p, d){\mathrm{C}}^{11}$, ${\mathrm{S}}^{32}(p, d){\mathrm{S}}^{31}$, and ${\mathrm{Pb}}^{208}(p, d){\mathrm{Pb}}^{207}$ at about 28 MeV and ${\mathrm{Fe}}^{56}({\mathrm{He}}^{3}, \ensuremath{\alpha}){\mathrm{Fe}}^{55}$ at 30 and 40 MeV. Pronounced $J$ dependence was found to persist for both $l=1$ and $l=3$ transfers in the ${\mathrm{Fe}}^{56}(p, d){\mathrm{Fe}}^{55}$ and ${\mathrm{Ni}}^{58}(p, d){\mathrm{Ni}}^{57}$ reactions over the entire energy range; changes with energy are gradual but definite. The spin dependence of $l=2$ distributions in the ${\mathrm{S}}^{32}(p, d){\mathrm{S}}^{31}$ reaction is equally striking, but essentially no $J$ dependence was observed for either $l=1$ or $l=3$ transfer in the ${\mathrm{Pb}}^{208}(p, d){\mathrm{Pb}}^{207}$ reaction. Apparent $Q$ dependence makes the interpretation of the ${\mathrm{C}}^{12}(p, d){\mathrm{C}}^{11}$ results ambiguous. The ${\mathrm{Fe}}^{56}({\mathrm{He}}^{3}, \ensuremath{\alpha}){\mathrm{Fe}}^{55}$ reaction revealed small but noticeable phase differences between ${\frac{5}{2}}^{\ensuremath{-}}$ and ${\frac{7}{2}}^{\ensuremath{-}}$ distributions. Analysis of the ${\mathrm{Fe}}^{56}(p, d){\mathrm{Fe}}^{55}$-distributions with the distorted wave Born approximation was not successful in explaining the results. Finite-range nonlocal calculations including spin-orbit forces in both incoming and outgoing channels and/or modified neutron form factors predicted little $J$ dependence.
Publication Year: 1967
Publication Date: 1967-02-20
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 74
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