Bridging quantum chemistry and nuclear structure theory: Coupled-cluster calculations for closed-and open-shell nuclei AIP Conf.Abstract. In the calculations of the many-nucleon bound states, using the realistic nucleon-nucleon potential, and a three-and four-nucleon potential, the Exact Many-Body Nuclear Cluster Model (EMBNCM) was found to give accurate results, that converege much more rapidly, than those obtained by the Faddeev equation calculations. With the use of realistic nucleon-nucleon potentials, and many-nucleon potentials, containing strong tensor, Majorana, and repulsive core components, the many-body cluster structure of 16 O, 27 Al, 44 Ti, and 48 Ti is discussed. In 27 Al(p,x)Na reactions we assume that two different nuclear cluster structures of 27 Al, gives us two different isotopes of Na: 22 Na and 24 Na. But the most important result is the existence of two different permutations symmetries of 27 Al. Using new method for calculation of nuclear cluster structure of 27 Al, we have found two different nuclear cluster structures of 27 Al: 24 Na+ 3 He and 25 Na+d. The internal nuclear cluster wave functions of different nuclear cluster models (nuclear cluster isomers) of the same isotope are not equivalent, if we take into account Many-Body Nuclear Forces, such as 3BF and 4BF. The core clusters of 16 O, 27 Al, 44 Ti, and 48 Ti nuclei have a trigonal-pyramide T d , D 2d , and C 3v symmetry, while exterior clusters in 16 O and 27 Al ´2 4 Na · 3 Heµmodel nuclei have a trigonal symmetry C 2v and D 3h . We have developed a new system of Jacobi coordinates for our EMBNCM model with the symmetry above. The new computer code for determination of direct nuclear cluster reactions has been written in Mathematica 5 programming language. We have found a high level of dependence of the nuclear cluster wave functions from the center of mass and cluster effects. 395This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded
Abstract. The new computer code MEDICUS has been used to calculate cross sections of nuclear reactions. The code, implemented in MATLAB 6.5, Mathematica 5, and FORTRAN 95 programming languages, can be run in graphical and command line mode. Graphical User Interface (GUI) has been built that allows the user to perform calculations and to plot results just by mouse clicking. The MS Windows XP and Red Hat Linux platforms are supported. MEDICUS is a modern nuclear reaction code that can compute charged particle-, photon-, and neutroninduced reactions in the energy range from thresholds to about 200 MeV. The calculation of the cross sections of nuclear reactions are done in the framework of the Exact Many-Body Nuclear Cluster Model (EMBNCM), Direct Nuclear Reactions, Pre-equilibrium Reactions, Optical Model, DWBA, and Exciton Model with Cluster Emission. The code can be used also for the calculation of nuclear cluster structure of nuclei. We have calculated nuclear cluster models for some nuclei such as 177 Lu, 90 Y, and 27 Al. It has been found that nucleus 27 Al can be represented through the two different nuclear cluster models: 25 Mg + d and 24 Na + 3 He. Cross sections in function of energy for the reaction 27 Al( 3 He, x) 22 Na, established as a production method of 22 Na, are calculated by the code MEDICUS. Theoretical calculations of cross sections are in good agreement with experimental results. Reaction mechanisms are taken into account.
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