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Manuscript Title: Fortran program SPALL for computing spallation reaction cross sections.
Authors: J.T. Routti, J.V. Sandberg
Program title: SPALL
Catalogue identifier: AAVE_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 23(1981)411
Programming language: Fortran.
Computer: UNIVAC 1108.
Operating system: EXEC8.
RAM: 16K words
Word size: 36
Keywords: Elementary, Particle physics, Scattering, Empirical model, Spallation reactions, Cross sections, Rudstam formulae, Silberberg-tsao formulae.
Classification: 11.6.

Nature of problem:
Spallation reactions take place when high-energy hadrons (protons, neutrons or pions) collide with nuclei. The emission of a large number of nucleons is possible in these reactions leading to a large variety of product nuclides, many of which are radioactive. The program SPALL is designed to compute spallation yield cross sections for different products from various targets as a function of the incident hadron energy.

Solution method:
The spallation yield cross sections are computed according to semiempirical formulae published by Rudstam and Silberberg and Tsao.

Restrictions:
The semiempirical formulae can be best applied to medium heavy and heavy nonfissionable target nuclides, which have also been used in the parameter fitting. The formulae should not be used when the difference in target and product masses is very large or very small. The incident hadron energy is usually tens of MeV or more. No difference is made between incident hadrons of different types, but the formulae are based mainly on data from proton irradiations.

Running time:
ON the UNIVAC 1108 computer the typical running time for a single reaction product at 40 energy points is about 0.35 s of CPU time.