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Manuscript Title: NUCADA, two adaptations of the system NUCORE for nuclear structure calculations.
Authors: C.A. Heras, S.M. Abecasis
Program title: NUCADA
Catalogue identifier: AARQ_v2_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 29(1983)73
Programming language: Fortran.
Computer: IBM 4341.
Operating system: DOS/VSE (R2.0 PUT 8005), VM/CMS.
RAM: 768K words
Word size: 32
Keywords: Nuclear physics, Cluster model, Cluster-phonon model, Nuclear physics, Cluster model, Cluster-phonon model, Cluster-core model Minimization, Nuclear energy levels, Quadrupole reduced Electric transition Probabilities, Dipole reduced magnetic Transition probabilities, Electric quadrupole Moments, Magnetic dipole moments.
Classification: 17.21.

Subprograms used:
Cat Id Title Reference
ACWH_v1_0 MINUIT CPC 10(1975)343

Nature of problem:
Calculation of nuclear energy levels and their electromagnetic properties (transitions only between levels of the same parity). The nucleus is modelled as a cluster of a few particles and/or holes interacting with a core which in turn is either modelled as a quadrupole-octupole vibrator (cluster-phonon model), or of unspecified nature (cluster-core model). The members of the cluster interact via quadrupole-quadrupole and pairing forces in the first case, and via a delta force in the second.

Solution method:
The Hamiltonian matrix is calculated in an appropriate basis. Then it is diagonalized with adjustable parameters determined by fitting calculated to experimental energy levels through chi-square minimization with system MINUIT. The adjustable parameters are the single-particle energies and interaction strength constants in the cluster-phonon model, to which matrix elements involving the core are added in the cluster- core model. The resulting eigenvalues and eigenvectors are used to calculate electromagnetic properties of the levels.

Restrictions:
(1) the code for the cluster-phonon model is restricted to a maximum number of two phonons of either type. The routine which builds the configuration space is specific for the current nucleus.
(2) as in the original version of this program , the code depends essentially on the use of the system MINUIT. Of course alternative routines may be used with the appropriate changes. Moreover, the diagonalizing routines use only non-zero matrix elements.