Reaction $^{3}$He ($\pi^+$, $P P$) $P$ at $T (\pi$) = 350-{MeV} and 500-{MeV}

Smith, L.C.; Minehart, R.C.; Ashery, D.; Piasetsky, E.; Moinester, M.; Navon, I.; Geesaman, D.F.; Schiffer, J.P.; Stephans, G.; Zeidman, B.

doi:10.1103/PhysRevC.40.1347

Reaction $^{3}$ He ( $\pi^+$ , $P P$ ) $P$ at $T (\pi$ ) = 350-{MeV} and 500-{MeV}

1989

16 pages

Published in:

Phys.Rev.C 40 (1989) 1347-1362

DOI:

10.1103/PhysRevC.40.1347

Report number:

CEBAF-PR-89-50

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Abstract: (APS)

The reaction He3(π+,pp)p was measured at Tπ=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 πd→pp 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 ‖M3‖2 displays an angular dependence at both energies which is suggestive of initial-state interactions. No evidence of final-state interactions is seen.

pi+ light nucleus: nuclear reaction
helium: nuclide
model: absorption
recoil: momentum spectrum
angular distribution
cross section: energy dependence
nuclear properties: effect
impulse approximation
spectrometer: experimental results
LAMPF Linac

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