Elsevier

Nuclear Physics A

Volume 486, Issues 3–4, 19–26 September 1988, Pages 512-525
Nuclear Physics A

Charge number dependence of π+ production from nuclei by 200 MeV electron

https://doi.org/10.1016/0375-9474(88)90160-1Get rights and content

Abstract

Photopion energy distributions have been measured on 7Li, 28Si, 51V and 93Nb at θπ = 90° with 200 MeV electron. The logarithmic plot of the distributions shows a break at around 10 MeV of the residual energy. This is not explained by the quasi-free π+ production. The (e,π+) cross sections at θπ = 90° deduced by integrating the energy distribution. The result can be approximated by σ0Z23, where σ0 is 0.13 times the elementary cross section of H(e, π+) at θπ = 90°. The quasi-free π+ production calculated by the Fermi-gas model with Pauli exclusion principle approximately reproduces the relative dependence on the charge number but its absolute value is about ten times as large as the experimental result. The present result for the charged photopion cross section in the threshold region is in contrast to the case in the Δ-resonance region where the cross section of π+ + π photoproduction is expressed by A23 times the elementary cross sections.

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    1

    Present address: Institute for Nuclear Study, University of Tokyo, Tanashi 188, Japan.

    2

    Present address: Brookhaven National Laboratory, Upton, Long Island, New York 11973, USA.

    3

    Present address: National Laboratory for High-Energy Physics, Ibaraki 305, Japan.

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