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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_0Distribution 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. |

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