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Manuscript Title: A program to aid in establishing gamma-ray decay schemes.
Authors: B.P. Foster, D.C. Camp
Program title: DECAY SCHEME PROGRAM, DCSCH4
Catalogue identifier: ABOG_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 2(1971)289
Programming language: Fortran.
Computer: IBM 360-50.
Operating system: OS MFT II (HASPII).
RAM: 32K words
Word size: 32
Peripherals: disc.
Keywords: Nuclear physics, Energy level, Gamma ray, Photon, Quantum, Ritz combination Principle, Heavy ion, Activity detection.
Classification: 17.6, 17.7.

Nature of problem:
The problem of determining a gamma-ray decay scheme and establishing energy levels from the gramma-spectra can be a tedious process. The programs DCSCH3 and DCSCH4 are designed to furnish the experimenter, in a convenient form, the information he needs to carry out this task.

Solution method:
The energies of the gamma rays and the energies of the known excited states are fed in as input data. The program then compares, within the specified errors, various comparisons of the sums and differences in the energies of the gamma rays to the excited states and their differences. The programs group and display the results so as to be convenient to the experimenter. In DCSCH3 they are grouped according to the gamma rays involved, while in DCSCH4 they are grouped by excited state. The programs print out the upper and lower excited states involved in the gamma-ray transitions implied by the comparisons. One of these excited states is a new tentative excited state which was not used in the comparison cited. These tentative states are stored, each with a tag word indicating the gamma ray and the input energy state involved. Later the tentative states are arranged and printed out. The two programs compliment each other so that one has in a convenient format all of the pertinent information to determine the most probable decay scheme.

Restrictions:
The program as written is restricted to 150 gamma rays and 50 excited states. These restrictions were dicated by the memory of North Texas State University computer and can be easily increased or decreased.

Running time:
The running times vary with the number of input gamma rays and excited states. An example of typical running times in analyzing the spectrum of 76Ge running on the IBM 360-50, at North Texas State University, under compiler LEVEL H are shown in table 1 in the conclusion. With the maximum input of 150 gamma-rays and 50 energy states the running time will be between 30 and 45 minutes. Running on the IBM 360-50 with Compiler G, the program takes several times longer. Running similar data on the Livermore CDC 6600 with 102 gammas and 78 excited states it took 15.3 minutes to run using disc storage for 3562 tentative states generated. Recoding to use the CDC 6600 core to store the 3562 tentative excited states generated, the running time was reduced to 3 minutes for the same input data.