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Title: Resonating-group-method study of. cap alpha. +/sup 40/Ca elastic scattering and /sup 44/Ti structure

Abstract

The ..cap alpha..+/sup 40/Ca elastic scattering cross sections in the energy range from 29.0 to 61.0 MeV are shown to be well reproduced by the resonating-group method by introducing a phenomenological imaginary potential. The local potential equivalent to the nonlocal potential of the resonating-group method is found to be very close to the optical potential of Delbar et al. which fits the scattering data well in a wide energy range. Since the optical potential of Delbar et al. is the so-called unique optical potential which is free from the discrete ambiguity, this result means that the resonating-group method is powerful and reliable for the study of the internucleus interaction. By calculating the bound and quasibound level spectra by the same ..cap alpha..+/sup 40/Ca resonating-group method, it is found that the lowest positive parity rotational band is located near the observed ground rotational band of /sup 44/Ti. In addition, when we use other effective two-nucleon forces so as to locate the calculated lowest 0/sup +/ state near the observed excited 0/sup +/ state with the excitation energy 8.54 or 11.2 MeV, which has large ..cap alpha.. strength, the fitting of the elastic scattering data by the resonating-group method is found tomore » be very bad. These results force us to regard that the structure of the /sup 44/Ti ground band as containing a large amount of ..cap alpha..+/sup 40/Ca clustering component. However our present resonating-group method predicts the appearance of the negative parity rotational band with its bandhead 1/sup -/ state below the excitation energy 10 MeV although there have been reported no such experimental indications at all of this.« less

Authors:
;
Publication Date:
Research Org.:
Research Institute for Fundamental Physics, Kyoto University, Kyoto 606, Japan
OSTI Identifier:
6720981
Resource Type:
Journal Article
Journal Name:
Phys. Rev. C; (United States)
Additional Journal Information:
Journal Volume: 38:5
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ALPHA REACTIONS; ELASTIC SCATTERING; CALCIUM 40 TARGET; TITANIUM 44; ROTATIONAL STATES; BOUND STATE; CLUSTER MODEL; CROSS SECTIONS; MEV RANGE 10-100; NUCLEAR POTENTIAL; OPTICAL MODELS; PARITY; RESONATING-GROUP METHOD; SHELL MODELS; SPIN; SU-3 GROUPS; ANGULAR MOMENTUM; BETA DECAY RADIOISOTOPES; CHARGED-PARTICLE REACTIONS; ELECTRON CAPTURE RADIOISOTOPES; ENERGY LEVELS; ENERGY RANGE; EVEN-EVEN NUCLEI; EXCITED STATES; INTERMEDIATE MASS NUCLEI; ISOTOPES; LIE GROUPS; MATHEMATICAL MODELS; MEV RANGE; NUCLEAR MODELS; NUCLEAR REACTIONS; NUCLEI; PARTICLE PROPERTIES; POTENTIALS; RADIOISOTOPES; SCATTERING; SU GROUPS; SYMMETRY GROUPS; TARGETS; TITANIUM ISOTOPES; VARIATIONAL METHODS; YEARS LIVING RADIOISOTOPES; 653001* - Nuclear Theory- Nuclear Structure, Moments, Spin, & Models; 653003 - Nuclear Theory- Nuclear Reactions & Scattering

Citation Formats

Wada, T, and Horiuchi, H. Resonating-group-method study of. cap alpha. +/sup 40/Ca elastic scattering and /sup 44/Ti structure. United States: N. p., 1988. Web. doi:10.1103/PhysRevC.38.2063.
Wada, T, & Horiuchi, H. Resonating-group-method study of. cap alpha. +/sup 40/Ca elastic scattering and /sup 44/Ti structure. United States. doi:10.1103/PhysRevC.38.2063.
Wada, T, and Horiuchi, H. Tue . "Resonating-group-method study of. cap alpha. +/sup 40/Ca elastic scattering and /sup 44/Ti structure". United States. doi:10.1103/PhysRevC.38.2063.
@article{osti_6720981,
title = {Resonating-group-method study of. cap alpha. +/sup 40/Ca elastic scattering and /sup 44/Ti structure},
author = {Wada, T and Horiuchi, H},
abstractNote = {The ..cap alpha..+/sup 40/Ca elastic scattering cross sections in the energy range from 29.0 to 61.0 MeV are shown to be well reproduced by the resonating-group method by introducing a phenomenological imaginary potential. The local potential equivalent to the nonlocal potential of the resonating-group method is found to be very close to the optical potential of Delbar et al. which fits the scattering data well in a wide energy range. Since the optical potential of Delbar et al. is the so-called unique optical potential which is free from the discrete ambiguity, this result means that the resonating-group method is powerful and reliable for the study of the internucleus interaction. By calculating the bound and quasibound level spectra by the same ..cap alpha..+/sup 40/Ca resonating-group method, it is found that the lowest positive parity rotational band is located near the observed ground rotational band of /sup 44/Ti. In addition, when we use other effective two-nucleon forces so as to locate the calculated lowest 0/sup +/ state near the observed excited 0/sup +/ state with the excitation energy 8.54 or 11.2 MeV, which has large ..cap alpha.. strength, the fitting of the elastic scattering data by the resonating-group method is found to be very bad. These results force us to regard that the structure of the /sup 44/Ti ground band as containing a large amount of ..cap alpha..+/sup 40/Ca clustering component. However our present resonating-group method predicts the appearance of the negative parity rotational band with its bandhead 1/sup -/ state below the excitation energy 10 MeV although there have been reported no such experimental indications at all of this.},
doi = {10.1103/PhysRevC.38.2063},
journal = {Phys. Rev. C; (United States)},
number = ,
volume = 38:5,
place = {United States},
year = {1988},
month = {11}
}