Single-nucleon transfer to unbound states by means of the 4He(α, 3He) 5He reaction at 158 and 200 MeV

Steyn G.F. ; Fortsch S.V. ; Lawrie J.J. ; Smit F.D. ; Newman R.T. ; Cowley A.A. ; Lindsay R. (1996)


The 4He(α,3He)5He(g.s.) reaction was studied at incident laboratory energies of 158 and 200 MeV for c.m. scattering angles ranging from ∼16° to 100°. The shape of the 5He(g.s.) peak in the measured 3He energy spectra is well reproduced by distorted-wave Born approximation calculations. Whereas calculations utilizing six-parameter optical potentials yield good qualitative agreement with the measured angular distributions, unacceptably poor agreement is found when nine-parameter potentials are utilized. Absolute normalization with D20 strengths extracted from corresponding zero-range and finite-range calculations overpredicts the measurements by factors of ∼2 to 3.

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