Pion absorption by He3 at the resonance energy

S. Mukhopadhyay*, S. Levenson, R. E. Segel, G. Garino, D. Geesaman, J. P. Schiffer, G. Stephans, B. Zeidman, E. Ungricht, H. Jackson, R. Kowalczyk, D. Ashery, E. Piasetsky, M. Moinester, I. Navon, L. C. Smith, R. C. Minehart, G. S. Das, R. R. Whitney, R. McKeownB. Anderson, R. Madey, J. Watson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Pion absorption by He3 was studied at T=165 MeV in a kinematically complete experiment. The cross section for absorption on a (pn) pair of nucleons, pn(+), was found to be 17.0±2.6 mb; that for absorption on a (pp) pair, pp(-), 0.91±0.20 mb. The angular distribution in the NN center-of-mass system for pn(+) resembles that for the ++dp+p reaction while the angular distribution for pp(-) is strongly backward peaked. Evidence that a significant fraction of the absorptions involves all three target nucleons is seen in the angular correlation between the two detected nucleons as well as in the momentum distribution of the unobserved nucleon. For + and - absorption, the three-body cross sections were found to be 9.6±2.1 and 4.2±01.2 mb, respectively. Neither initial- nor final-state interactions appear to be major contributors to the observed three-body absorption, though initial-state interactions may be contributing to the enhancement of the three-body + absorption at the resonance.

Original languageEnglish
Pages (from-to)957-972
Number of pages16
JournalPhysical Review C - Nuclear Physics
Issue number3
StatePublished - 1991


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