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Manuscript Title: Fluences and energy spectra of fast neutrons from a proton-irradiated thick lithium target.
Authors: G.H.R. Kegel
Catalogue identifier: AABP_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 36(1985)321
Programming language: RTE Assembler.
Computer: HP1000.
Operating system: RTE-11.
Keywords: Neutron energy spectrum, Fast neutrons, Neutron fluence, 7Li(p,n)7Be, Thick target, P-n reaction, Apparatus design.
Classification: 17.1, 17.2.

Nature of problem:
Neutrons in the 10- to 4000-keV energy range can be obtained by irradiating a thick lithium target with protons. As protons penetrate the target they gradually lose energy. Muri determines the probability of neutron generation along the proton path, computes the probability that a neutron will reach a prescribed volume element, and finds the energy spectra of neutrons that do so. The code also provides a neutron energy spectrum weighted with the response of a uranium fission chamber and computes the total number of neutrons generated.

Solution method:
Numerical integration.

The following effects are not taken into account:
1. Proton straggling and proton angular spread.
2. Neutron scattering and absorption in the target, in the target back-up, or in the beam pipe.

Running time:
12 s.