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The angular distribution of the 12C(γ,pn) reaction for Eγ=120?150 MeV |
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| Authors: | TT-H Yau IJD MacGregor J Ahrens JRM Annand R Beck D Branford P Grabmayr SJ Hall PD Harty T Hehl DG Ireland JD Kellie T Lamparter K Livingston M Liang JA MacKenzie S McAllister JC McGeorge RO Owens M Sauer R Schneider DP Watts |
| Institution: | Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, UK, GB Institut für Kernphysik, Universit?t Mainz, D-55099 Mainz, Germany, DE Department of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, UK, GB Physikalisches Institut, Universit?t Tübingen, D-72076 Tübingen, Germany, DE |
| Abstract: | The angular distribution of nucleons emitted in the 12C(γ,pn) reaction has been measured using tagged photons at the Mainz microtron MAMI. The variation of the reaction strength with the polar angles of the two emitted nucleons is reported for Eγ=120−150 MeV. The proton angular distribution peaks at more backward angles than the 2H(γ,p) differential cross section indicating a departure from the simple quasi-deuteron model of 2N photo-emission. The distribution shape is in reasonable agreement with microscopic theoretical models which include both π- and ρ-exchange. Received: 3 September 1997 / Revised version: 17 December 1997 |
| Keywords: | PACS:21 30 Fe Forces in hadronic systems and effective interactions – 25 20 Lj Photoproduction reactions – 27 20 +n 6 ≤ A ≤ 19 |
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