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Manuscript Title: MIA, a FORTRAN-IV program for making spin and parity assignments to high-lying single and coherent twin nuclear levels from (alpha, nucleon) angular distributions in on-resonance, compound-nuclear, channel-spin-1/2 reactions.
Authors: E. Sheldon, D.R. Donati, H.R. Hiddleston
Program title: MIA
Catalogue identifier: ABMI_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 8(1974)199
Programming language: Fortran.
Computer: DIGITAL PDP-9.
Operating system: PDP-9 ADVANCED SOFTWARE SYSTEM.
RAM: 24K words
Word size: 36
Peripherals: disc.
Keywords: Nuclear physics, Spin-parity assignments, Reactions, Channel spin, Resonance, Compound nucleus, Single-level, Twin-level resonances, Angular distribution, Differential Cross section, Distribution function, Legendre polynomial, Vector momentum coupling, Display oscilloscope, Storage oscilloscope, Print-out plotted, Theoretical methods.
Classification: 17.10, 17.16.

Nature of problem:
Nuclear spectroscopy yielding spin and parity assignments to high-lying compond nuclear levels is facilitated by the study of angular distributions from on-resonance reactions involving channel-spin-1/2(or spin-0) incoming and outgoing interaction channels. For pure single- level or coherent twin-level resonances the spin/parity assignments can be deduced from a direct graphic comparsion of measured and calculated angular distributions for, e.g. (alpha,nucleon) reactions on spin-1/2 target nuclei leading to spin 0 residual nuclear states. The program 'MAI' is designed to accomplish this task, taking into account entrance and exit barrier penetrabilities, the effect of competing outgoing reaction channels and if desired, spin-orbit coupling; it features oscilloscope display, external parameter manipulation and plotted print out facilities that permit interactive commumication between the operator and the data.

Solution method:
At option the program can range from consideration of a single, pure, resonance angular distribution to a cyclic sequence of 1015 possible combinations of parameters specifying single-level and coherent twin- level involvement, displaying the experimental and theoretical results graphically on an oscilloscope creen for direct comparison of shape and magnitude, with opportunity for parameter variation from the console teletype keyboard. Selected results can at will be printed out in tabular and plotted form for subsequent reference.

Restrictions:
The program is designed to cater for half-integer-spin states in the compound nucleus ranging from 1/2 to 13/2 of either parity; it has specifically been compiled for consideration of channel-spin-1/2 on- resonance reactions induced by alpha particles, of the type 1/2 +- (alpha, Eta)0+. Hence the orbital momenta are restricted to lmax <= 6.