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  • 1990-1994
  • 1985-1989  (2)
  • 21.60.F  (1)
  • 21.60.−n  (1)
  • 1
    Electronic Resource
    Electronic Resource
    A new derivation of the Marshalek-Okubo realization of the shell-model algebraso(2v+1) for even and odd systems withv single-particle levels (1988)
    Springer
    The European physical journal 329 (1988), S. 441-449 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.C ; 21.60.E ; 21.60.F
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In recent years, the method for unitarizing nonunitary Dyson boson realizations of shellmodel algebras has been both generalized and substantially simplified through the introduction of overtly group-theoretical methods. In this paper, these methods are applied to the boson-odd-particle realization of the algebra SO(2v+1) forv single-particle levels, adapted to the group chain SO(2v+ l)⊃SO(2v)⊃U(v), which Marshalek first derived by brute force summation of a Taylor expansion and later Okubo by a largely algebraic technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294349
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    New variational derivation of the coupled cluster expansion and its relation to green functions and diagrams (1985)
    Springer
    The European physical journal 321 (1985), S. 499-505 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.−n ; 21.65.+f
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The coupled cluster equations first proposed by Coester and Kümmel and developed by Kümmel, Lührmann, and Zabolitsky are derived explicitly from the variational principle for the ground state energy (the “true” energy) using a new set of simple formulas relating density matrices (equal time limits of Green functions) to the coupled cluster functions. In this respect a simplification appears to be achieved by working with a normalized ground state wave function. The further transformation of the variational equations into the standard forms given by the previous authors differs mainly in its pedagogical aspects from ideas found in the existing literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411985
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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