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  • 1975-1979  (4)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Influence of an enlargement of the model space on number projected quasiparticle calculations (1976)
    Springer
    The European physical journal 276 (1976), S. 1-8 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Results of number projected quasiparticle calculations for Sn isotopes in large and in small model spaces are compared when the force strengths and single-particle energies are determined consistently within each model space. When extending the model space, one observes that the model parameters extracted from the odd nuclei become more satisfactory. For even nuclei the collective states are not lowered in energy although electromagnetic transition rates increase considerably. Spectroscopic factors for one-nucleon transfer reactions change noticeably only for shells close to the Fermi level. Two-nucleon transfer cross-sections are strongly increased for ground state to ground state transitions only. We criticize a usual approximation formula for theL=0 two-nucleon transfer cross-section.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414585
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Hermitian operator method calculation in thepf-shell (1978)
    Springer
    The European physical journal 286 (1978), S. 187-194 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Excitations inpf-shell nuclei that may be described by a one-body Hermitian operator are calculated. For the ground states highly correlated wave functions are used, which were obtained by means of the Generator Coordinate Method (GCM). It is found that the results of the Hermitian Operator Method (HOM) for the excited states are sometimes superior to those of the GCM, especially for the two-quasiparticle states in the N=28 nuclei50Ti,52Cr,54Fe. Typically vibrational or quasi-rotational 4+ and 6+ states in46, 48Ti,50Cr are not well reproduced by the HOM, as expected. A good account for theB(E2) values of transitions to the ground state can be given for all nuclei. It is concluded that the HOM is quite useful as a supplementary calculation and as a check for complicated calculations like the GCM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408975
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A broken-pair description of89Y,91Nb and93Tc (1979)
    Springer
    The European physical journal 292 (1979), S. 159-169 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The low-energy properties of89Y,91Nb and93Tc are described in a broken-pair model. The shell model space for the protons consists of one major shell and for the neutrons particle-hole states within two major shells are taken into account. The effective interaction is assumed to be a simple Gaussian Serber force, which has proved to be the most successful in adjacent even nuclei. Energy spectra up to about 3 MeV excitation energy and one-nucleon transfer data can be described very well. Also electromagnetic properties can be reproduced rather well if reasonable effective charges are used. No indication for deformed states, as found in Sn nuclei, is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01441623
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Number-projected three-quasiparticle description of the odd Sn isotopes (1978)
    Springer
    The European physical journal 288 (1978), S. 49-57 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An account is given of the description of the low-energy properties of the odd Sn nuclei in terms of number projected one- (1 q.p.) and three-quasiparticle (3 q.p.) states. The shell model space for the neutrons consists of one major shell. A simple Gaussian force is used as an effective interaction. Its strength and the single-particle energies, which are the only parameters, are derived in a consistent way from spectroscopic data on the one-quasiparticle states. We find that the spectra can be well interpreted in terms of 1 q.p. and 3 q.p. states. Branching ratios of gamma decay, one-nucleon transfer spectroscopic factors, electric and magnetic moments show generally good agreement with the experimental data. For half-lives and mixing ratios, which are most sensitive to details of the 3 q.p. components, the agreement is less, but all have the correct order of magnitude.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408201
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    Paper (German National Licenses)
    Fulltext
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