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Manuscript Title: Static and dynamic muonic-atom codes MUON and RURP.
Authors: G.A. Rinker
Program title: RURP
Catalogue identifier: ABNC_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 16(1979)221
Programming language: Fortran.
Computer: CDC 6400, CDC 6600, CDC 7600.
Operating system: ANY BATCH PROCESSOR.
RAM: 45K words
Word size: 60
Keywords: Nuclear physics, Atomic physics, Muonic atoms, Nuclear polarization, Dynamic Hyperfine structure, Energy level, Transition intensities.
Classification: 2.8.

Subprograms used:
Cat Id Title Reference
ABNB_v1_0 MUON CPC 16(1979)221

Nature of problem:
Coupled muon-nuclear wave funtions, energy levels, and transitions energies and intensities are calculated. The results are corrected for nearly all effects of nuclear excitation.

Solution method:
The muon-nuclear Hamiltonian is represented in an angular-momentum basis and diagonalized to all order in a truncated subspace and to second order in the remainder of the infinite Hilbert space. The finite-space diagonalization is accomplished by standard means. The remianing diagonalization is accomplished by the implicit solution of the appropriate inhomogeneous differential equations in the muon radial coordinate using a band-matrix inversion technique.

Restrictions:
No more than 9 muon levels and 8 nuclear levels may be included at any one time. The only magnetic interaction included is the static M1 HFS interaction.

Unusual features:
The main arrays are allocated semi-dynamically in order to keep core requirements to a minimum. Although the code as supplied is set up for CDC computers, previous versions have been run successfully on IBM 370/ 168 using the H-compiler with the AUTODOUBLE option. Use of the code on low-precision machines is recommended omly if extensive double precision is implemented.

Running time:
The code and test cases as supplied are compiled, loaded and executed in 322 s on a CDC-6600, of which 43 s are compilation (FTN compiler with optimization level 2).