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Photoemission of protons from 4He in the ⊿-resonance region

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Zeitschrift für Physik A Hadrons and nuclei

Abstract

High resolution proton energy spectra from the 4He(γ,p) reaction have been measured with tagged photons in the range Eγ = 130–525 MeV using the large Mainz NaI(Tl) spectrometer at \([Theta _p^{lab} = 37.1^circ ]\). 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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Author notes

  1. R. Wichmann

    Present address: Santa Cruz Institute for Particle Physics, UC Santa Cruz

  2. F. Wissmann

    Present address: II. Physikalisches Institut der Universität Göttingen, D-37073, Göttingen, Germany

Authors and Affiliations

  1. II. Physikalisches Institut, Universität Göttingen, D-37073, Göttingen, Germany

    R. Wichmann, G. Galler, A. Hünger, A. Kraus, B. Seitz, O. Selke & M. Schumacher

  2. Institut für Kernphysik, Universität Mainz, D-55099, Mainz, Germany

    J. Ahrens, H. J. Arends, R. Beck, J. Peise, M. Schmitz, M. Schneider & F. Wissmann

  3. Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, Scotland

    I. J. D. MacGregor

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Wichmann, R., Ahrens, J., Arends, H.J. et al. Photoemission of protons from 4He in the ⊿-resonance region. Zeitschrift für Physik A 355, 169–177 (1996). https://doi.org/10.1007/s002180050095

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