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  • 21.60.Ev  (3)
  • 21.10.Ma  (2)
  • 21.10.Pc  (2)
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  • 1
    Digitale Medien
    Digitale Medien
    IBFFM yrast states in odd-odd nuclei associated withO(6) andSU(3) limits (1988)
    Springer
    The European physical journal 329 (1988), S. 151-159 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.60.Ev ; 21.60.Fw
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract In the Interacting Boson-Fermion-Fermion Model (IBFFM) for odd-odd nuclei the yrast states are calculated for $$\tilde j_\pi = \tilde h_{1 1/2} ,\tilde j_v = \tilde i_{1 3/2} $$ , proton-neutron configurations coupled to theO(6) andSU(3) boson core. The results are discussed in terms of the strongly coupled/ decoupled band type criterion and in comparison to the peaceful and conflicting case of asymmetric rotor model.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01283770
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  • 2
    Digitale Medien
    Digitale Medien
    Structure of theN=59 nucleus97Sr: coexistence of spherical and deformed states (1990)
    Springer
    The European physical journal 337 (1990), S. 149-159 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 23.20.Lv ; 21.60.Ev ; 23.20.−g
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A band with a rotational pattern based on a state at 585.1 keV has been identified in theN=59 neutron-rich nucleus97Sr. Its properties lead to the [422] 3/2 Nilsson-orbital assignment for the band head. There is evidence for a second band with the head at 644.7 keV and the configuration [541] 3/2. Since the ground state and the lowest excited levels are spherical, shape coexistence is established for97Sr. A deformed nature of several levels at 500–600 keV results also from QRPA-model calculations. The structure of the low-lying spherical levels has been studied in the frame of the IBF model. The results of the present investigations lead to a better understanding of theN=59 isotones which constitute the link between the spherical and deformed nuclei atA∼100 as a species with shape coexistence but without any indications of particular softness.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01294286
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  • 3
    Digitale Medien
    Digitale Medien
    Nature of93Rb levels studied in IBFM (1989)
    Springer
    The European physical journal 333 (1989), S. 1-4 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.10.Pc ; 21.60.Fw ; 27.60.+j
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The structure of the low-lying states with negative parity of 37 93 Rb56 has been studied in the framework of the Interacting Boson-Fermion Model (IBFM) using the even-even neighbour 38 94 Sr56 as a core. A good description of the properties of the levels has been obtained. A sensitive test of the quality of the theoretical studies is the decay pattern of the second excited state at 267 keV with a half-life of 2.0(2) ns. The calculations givet 1/2=2.26 ns and they predict the existence of a 13 keV transition into the first excited state, the existence of which has been confirmed afterwards by experiments.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01290103
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  • 4
    Digitale Medien
    Digitale Medien
    Structure of the neutron-rich nucleus 37 94 rb57 (1989)
    Springer
    The European physical journal 334 (1989), S. 259-267 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.10.Pc ; 21.60.Fw ; 27.60.+j
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A level scheme has been established for 37 94 Rb57 based on studies at the fission-product separator JOSEF ofγγ coincidences following theβ- decay of94Kr. For the 190.7 keV level a half-life of 2.5(8) ns has been determined through the centroid-shift method. The majorβ-decay branch of94Kr proceeds with log ft=3.7 into the 988.4 keV state in94Rb. This transition must be of the 0+→1+ GT type involving the transitionνg7/2→πg9/2. IBFFM calculations have been performed for94Rb, starting from the parametrization used in the previous IBM investigations for the isotope93Rb and the isotone96Y. A theoretical interpretation of the low-lying levels including propositions for the spins is given in a comparison to the available data.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01284553
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  • 5
    Digitale Medien
    Digitale Medien
    Gaussian polynomial method for spin-dependent level density and new formula for spin distribution (1993)
    Springer
    The European physical journal 345 (1993), S. 343-357 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.10.Ma ; 02.90.+p
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Large-scale combinatorial calculations of level densities were performed for selected nuclei using Gaussian polynomial generating function method (GPM). Contrary to the results of previous combinatorial calculations, we find a good agreement of the combinatorial total level densities and Bethe formula. Combinatorial GPM calculations were performed also for spin-dependent level densities and comparison is made with various algebraic formulas. On the basis of our GPM calculations we propose a new phenomenological spin-dependent level density formula, which in the low-spin limit reduces to the spin-dependent formula of Bethe. The new formula (24) is for all spins factorized into the product of total level density and spin distribution function, where the spin distribution function (25) contains an additional spin correction parameter.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01282895
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  • 6
    Digitale Medien
    Digitale Medien
    Calculation of nuclear structure of205Pb relevant for the205Tl bdsolar neutrino detector (1995)
    Springer
    The European physical journal 350 (1995), S. 319-325 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.60.Cs ; 21.60.Ev ; 23.20.Ck ; 27.80.+w ; 96.60.Kx
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Energy spectrum and electromagnetic properties of205Pb have been studied in the cluster-vibration model (CVM). The lifetime of 0.3 ms was predicted for the 2.3 keV level which is of significance for considerations of the205Tl solar neutrino detector.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01291189
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  • 7
    Digitale Medien
    Digitale Medien
    Quantum chaos forN=79 nuclei in the IBFM model (1990)
    Springer
    The European physical journal 337 (1990), S. 131-137 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.10.Ma ; 24.60.Ky ; 27.60.+j
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Spectral rigidityΔ 3 (L) is calculated for the energy spectra of131Te,135Ba and137Ce, obtained in the IBFM calculation. Results reveal an intermediate situation between regularity and chaos, but remarkably closer to the chaotic limit. Influence of the model parameters on the fluctuation pattern is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01294283
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