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Manuscript Title: A code to determine the energy distribution, the incident energy and the flux of a beam of light ions into a stack of foils.
Authors: A.A. Sonzogni, A.S.M.A. Romo, W.R. Frosch, S.J. Nassiff
Program title: STP
Catalogue identifier: ACGM_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 69(1992)429
Programming language: Fortran.
Computer: DEC VAX-11/780.
Operating system: VMS V4.5.
RAM: 79K words
Word size: 32
Peripherals: disc.
Keywords: Nuclear physics, Light ions, Stacked-foil, Activation analysis, Stopping power, Nuclear reactions.
Classification: 17.8.

Nature of problem:
The stacked-foil technique is usually used to measure nuclear reaction excitation functions using light ions as projectiles. In this technique, the target is composed of several foils of different materials. For this target design it is necessary to know the energy of the beam at each foil. In addition, to obtain the right excitation functions it is necessary to know the true values of the incident energy and the flux of the beam. Therefore, some foils of a given material are intercalated in the stack.

Solution method:
The energy distribution into the stack is calculated using Stopping Power tables. The incident energy and the cummulative charge are taken as adjustable parameters in a chi-square minimization procedure to get a good agreement between the monitor excitation functions obtained from the stack and those considered to be very reliable.

Running time:
The presented test run took 90.7 seconds of CPU time.