Photoemission of protons from 4He in theΔ-resonance region
- Wichmann, R.
- Ahrens, J.
- Arends, H.J.
- Beck, R.
- Galler, G.
- Hünger, A.
- Kraus, A.
- MacGregor, I.J.D.
- Peise, J.
- Seitz, B.
- Schmitz, M.
- Schneider, M.
- Selke, O.
- Schumacher, M.
- Wissmann, F.
Publication date
December 1996
DOIAbstract
High resolution proton energy spectra from the4He(γ,p) reaction have been measured with tagged photons in the range Eγ = 130−525 MeV using the large Mainz NaI(T1) spectrometer atΘ p lab=37.1°. Three separate reaction channels were identified, viz.4He(γ,p)t two-body breakup,4He photodisintegration via two-nucleon photon absorption processes and the quasifree pion production channel. Differential cross sections are presented for each of these channels as a function of photon energy. The sum of the two-nucleon photon absorption and the quasifree pion production differential cross sections, in the CM system, resembles that of the corresponding free-nucleon differential cross section when Fermi motion is taken into account
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