Programs in Physics & Physical Chemistry
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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.|
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.
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.
(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.
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