4He(π,π'p)3H reaction: Quasifree and resonance scattering

M. K. Jones, D. Dehnhard, S. K. Nanda, S. M. Sterbenz, C. L. Morris, M. Plum, J. D. Zumbro, Ahmed Hussein, D. S. Oakley, M. J. Smithson, A. L. Williams, J. McDonald, M. A. Bryan, A. H. Fuentes, M. Lynker, D. Crockett, M. A. Machuca, S. Mordechai, C. Fred Moore

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6 Scopus citations


Exclusive 4He(π±±'p)3H spectra in the excitation energy range between 21.5 and 44 MeV in 4He were measured at Tπ=180 MeV at several pion and proton angles. The cross section ratio Rπp=σ(π+, π+,p)/(π--,p) was found to be between 1 and 2 near 22 MeV which is in the region of the Jπ=2-, T=0 state. Between 25 and 40 MeV in the continuum, which comprises the giant dipole resonance and broad 2- and 2+ states, Rπp ranges from 0.22 to 45 in sharp contrast to the predicted values of 1 from a model assuming the entire yield is due to the sequential decay of a state of good isospin, and 6 to 9 from a distorted-wave impulse approximation calculation assuming quasifree proton knockout.

Original languageEnglish
Pages (from-to)R807-R810
JournalPhysical Review C - Nuclear Physics
Issue number3
StatePublished - 1 Jan 1990
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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