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Manuscript Title: IBAR: Interacting boson model calculations for large system sizes
Authors: R.J. Casperson
Program title: IBAR
Catalogue identifier: AELI_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 183(2012)1029
Programming language: C++.
Computer: Any computer system with a C++ compiler.
Operating system: Tested under Linux.
RAM: 150 MB for 1000 boson calculations with angular momenta of up to L = 4.
Keywords: Interacting boson model, Quantum phase transitions, Reduced matrix elements, Nuclear structure.
PACS: 21.10.-k, 21.60.Fw.
Classification: 17.18, 17.20.

External routines: ARPACK (http://www.caam.rice.edu/software/ARPACK/)

Nature of problem:
Construction and diagonalization of large Hamiltonian matrices, using reduced matrix elements of the d-boson creation operator.

Solution method:
Reduced matrix elements of the d-boson creation operator have been stored in data files at machine precision, after being recursively calculated with higher than machine precision. The Hamiltonian matrix is calculated and diagonalized, and the requested transition strengths are calculated using the eigenvectors.

Restrictions:
The 1000 boson coefficients for L=0 and L=20 have been included in the IBAR distribution and the 7.3GB of data that make up the remaining coefficients for L=21 to L=2000 are available upon request.

Running time:
If the provided example is changed to include 100 bosons, the calculation requires about 1 second of run time. For 1000 bosons, the calculation requires about 9 minutes of run time.