Elsevier

Nuclear Physics A

Volume 526, Issues 3–4, 6–13 May 1991, Pages 479-494
Nuclear Physics A

Photon-induced emission of pions and protons from various nuclei in the Δ-resonance region

https://doi.org/10.1016/0375-9474(91)90430-EGet rights and content

Abstract

Double differential cross sections for the photon induced emission of π, π+ and protons from Be, C, O, Ti, and Pb have been measured in the photon energy range k = 220–450 MeV using the tagged photon beam of the Bonn 500 MeV synchrotron. The hadron detector consists of a magnetic spectrometer and a large acceptance scintillation counter array. For Be, the single-arm energy distributions show clear structures from quasi-free pion production and quasi-deuteron photodisintegration. These structures disappear with increasing target size. The dependence of the differential cross section on the nuclear size S at Θlab = 52° can be described by the power law dσ/dΩ ∞ Sα, where S is the number of protons or neutrons, respectively. The exponent is απ ≈ 0.6 for π and π+ and αp ≈ 1.15 for protons. Data for pn, pp, and pπ coincidences are presented. The results are compared to intranuclear cascade codes (PICA and PIKI) and to microscopic calculations.

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This work has been funded by the German Federal Minister for Research and Technology (BMFT) under the contract number 02 33 BN AI.

1

Present address: AEG Electrocom GmbH, Konstanz, Germany.

2

Present address: DETECON, Bonn, Germany.

3

Present address: CEBAF, Newport News, VA, USA.

4

Present address: Philips GmbH, Aachen, Germany.

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