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  • 21.10.Pc  (2)
  • 23.20.−g  (2)
  • 24.60.Ky  (2)
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  • 1
    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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  • 2
    Digitale Medien
    Digitale Medien
    Low-lying states and degree of chaoticity of40K in IBFFM (1988)
    Springer
    The European physical journal 330 (1988), S. 141-152 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 23.20.Gq ; 21.60.Fw ; 24.60.Ky
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The results of aγ-γ angular correlation and a low energyγ-ray singles measurement using thermal neutron capture in39K are presented. The properties of low-lying levels of40K are interpreted in a comparison of the experimental data with the Interacting-Boson-Fermion-Fermion Model (IBFFM). The level fluctuation properties of the IBFFM spectrum are analysed and a sizeable deviation from chaoticity is found.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01293389
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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
    Structure of the Triplet of low-lying states in101Mo (1991)
    Springer
    The European physical journal 339 (1991), S. 269-278 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 27.60.+j ; 23.20.−g ; 21.60.−n
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The properties of the triplet of low-lying states in101Mo have been studied through spectroscopy of theγ radiation following thermal neutron capture in100Mo and β− decay of101Nb and through a measurement of the proton angular distributions in the100Mo(d,p) reaction with 14 MeV deuteron energy. The half-lives of the 13.5 keV state and the 57.0 keV 5/2+ state have been measured as 226(7) and 133(7)ns, respectively. These values and the quadrupole/dipole mixing ratios of the 13.5 keV and 43.5 keV transitions yield spin and parity 3/2+ for the 13.5 keV level. The E2 components in the 13.5 (3/2+ →1/2+) and 43.5 keV (5/2+→3/2+) transitions are ≦ 8·10−4 and 54(9)%, respectively. The possibility of an additional state near to the 57.0 keV level is discussed. IBFM/PTQM calculations, taking into consideration the transitional character of the100Mo boson core, account for the electromagnetic-transition and transfer-reaction pattern of the triplet of states.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01284064
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  • 6
    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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