Reaction He3(+,pp)p at T=350 and 500 MeV

L. C. Smith, R. C. Minehart, D. Ashery, E. Piasetsky, M. Moinester, I. Navon, D. F. Geesaman, J. P. Schiffer, G. Stephens, B. Zeidman, S. Levinson, S. Mukhopadhyay, R. E. Segel, B. Anderson, R. Madey, J. Watson, R. R. Whitney

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Abstract

The reaction He3(+,pp)p was measured at T=350 and 500 MeV in a kinematically complete experiment. Separate contributions from two-body and three-body pion absorption are clearly seen in recoil momentum distributions. The two-body angular distributions closely follow the shape of the free dpp cross section, although the number of deuterons estimated from the two-body yield is larger than the value 1.5 expected from isospin coupling and observed previously at lower energies. Comparison with a simple impulse approximation model suggests some of the enhancement may arise from binding of the quasideuteron, although absorption on T=1 (pn) pairs and the higher density of He3 may also be a factor. The strength of the three-body component falls off with bombarding energy with roughly the same slope as for the two-body component, and accounts for 45% of the total absorption cross section, a larger fraction than reported previously below the (3,3) resonance. The three-body matrix element M32 displays an angular dependence at both energies which is suggestive of initial-state interactions. No evidence of final-state interactions is seen.

Original languageEnglish
Pages (from-to)1347-1362
Number of pages16
JournalPhysical Review C - Nuclear Physics
Volume40
Issue number3
DOIs
StatePublished - 1989

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