Mukhopadhyay, S. and Levenson, S. and Segel, R. E. and Garino, G. and Geesaman, D. and Schiffer, J. P. and Stephans, G. and Zeidman, B. and Ungricht, E. and Jackson, H. and Kowalczyk, R. and Ashery, D. and Piasetsky, E. and Moinester, M. and Navon, I. and Smith, L. C. and Minehart, R. C. and Das, G. S. and Whitney, R. R. and Mckeown, R. and Anderson, B. and Madey, R. and Watson, J. (1991) Pion absorption by 3He at the Δ-resonance energy. Physical Review C, 43 (3). pp. 957-972. ISSN 0556-2813 http://resolver.caltech.edu/CaltechAUTHORS:MUKprc91
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Pion absorption by 3He was studied at Tπ=165 MeV in a kinematically complete experiment. The cross section for absorption on a (pn) pair of nucleons, σpn(π+), was found to be 17.0±2.6 mb; that for absorption on a (pp) pair, σpp(π-), 0.91±0.20 mb. The angular distribution in the πNN center-of-mass system for σpn(π+) resembles that for the π++d→p+p reaction while the angular distribution for σpp(π-) 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 π+ and π- 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 π+ absorption at the Δ resonance.
|Additional Information:||©1991 The American Physical Society Received 29 October 1990 This work was supported by National Science Foundation (NSF) Grants PHY-8911777 (Northwestern) and PHY-8802392-02 (Kent State), U.S. Department of Energy, Nuclear Physics Division, under Contracts W-31-109-ENG-38 (Argonne) and DE-AS05-726ER0403 (Virginia), and U.S.-Israel Binational Science Foundation (Tel-Aviv).|
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