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  • Articles  (4)
  • 1985-1989  (1)
  • 1980-1984  (3)
  • 1986  (1)
  • 1983  (1)
  • 1980  (2)
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  • Articles  (4)
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  • 1985-1989  (1)
  • 1980-1984  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Density of high-spin states in38Ar and42Ca (1980)
    Springer
    The European physical journal 294 (1980), S. 51-64 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Theγ-decay modes of38Ar levels withE x ≦11,630keV and of42Ca levels withE x ≦10,036keV have been studied using the35Cl(α, pγ) reaction at 16MeV and the39K(α, pγ) reaction at 15.14 MeV, respectively. In both nuclei the number of states withJ≧6 exceeds fifty. Weak coupling calculations of the Bansal and French type reproduce the density of high-spin states. The success of the model implies that the excitations of up to four particles from thed 3/2 into thef 7/2 shell play a role in both nuclei. The structure of deformed states was found to be predominantly 4p/s 6h in38Ar and 4p/s 2h in42Ca, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01473121
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  • 2
    Electronic Resource
    Electronic Resource
    Shape coexistence and other aspects of nuclear structure in40Ar (1983)
    Springer
    The European physical journal 313 (1983), S. 123-132 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Theγ-decay of40Ar has been studied by particle-γ-ray coincidence measurements in the37Cl(α, pγ) reaction at 12 and 13 MeV bombarding energy. Particle-γ-ray angular correlations and linear polarizations ofγ-rays were measured at 12 MeV. A lifetime measurement using the Doppler-shift attenuation method was performed at 11 MeV. The coexistence of spherical and deformed states in40Ar could be concluded from the observation of aK π=0+ rotational band which has itsI π=0+ through 6+ members at 2,121, 2,524, 3,515 and 4,959 KeV excitation energy. The intrinsic quadrupole moment derived fromB(E2) values is ∥Q 0∥=1,320 −120 +60 mb. Negative-parity states with high spin were observed at 4,858(5−), 4,494(5−), 4,226(4−) and 4,991 KeV(4−) excitation energy. A complete account of all levels below 5 MeV excitation energy is obtained by a model in which twod 3/2 proton holes couple weakly to the42Ca levels below 4.75 MeV excitation energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02115850
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  • 3
    Electronic Resource
    Electronic Resource
    High-spin states in26Mg (1986)
    Springer
    The European physical journal 324 (1986), S. 187-204 
    Details
    ISSN: 1434-601X
    Keywords: 27.30+t ; 21.10 Hw ; 21.60 Cs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Theγ-decays of levels in26Mg have been investigated up to 12.5 MeV excitation energy by proton-γ-ray coincidence measurements in the23Na(α, pγ) reaction at 14.2 and 16 MeV bombarding energy. Lifetime-measurements, made with the Doppler-shift attenuation method, and proton-γ-ray angular-correlation measurements were performed at Eα=14.2 MeV. Many high-spin states were observed, among them levels at 6,978 (5+), 7,283(4−), 7,395(5+), 7,953(5−), 8,202(6+), 8,472(6+), 9,065(5), 9,112(6+), 9,169(6−), 9,383 (6+), 9,542(5), 9,829(7+), 9,989(6+) and 12,479(8+, 7−) keV excitation energy. The spectrum of positive-parity states and their electromagnetic properties are reproduced with good accuracy by shell-model calculations which employ a unifieds-d shell Hamiltonian and the unrestricted configuration space of the 0d 5/2 1s 1/2 0d 3/2 shell. Members of five inferred rotational bands, withK π=0+, 2+, 3+, 0+ and 3− have been observed up to at leastI=6. TheK π=2+ band shows strong anomalies of excitation energies andE2 transition rates near theI=6 state. The static intrinsic quadrupole moments calculated from the shell model wave functions indicate transitions from prolate to oblate deformation within theK π=2+ band and also the ground state band. The lowest lyingI π=4+ state appears to be “spherical” and cannot be associated with a rotational band.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01325130
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  • 4
    Electronic Resource
    Electronic Resource
    Structure of30Si from the spectroscopy of highly excited states (1980)
    Springer
    The European physical journal 298 (1980), S. 279-292 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Highly excited states in30Si were investigated using the27Al(α, p γ) reaction. Proton-γ ray angular correlations were measured atE α=12, 14.1 and 15MeV. At 15MeV linear polarizations ofγ-rays were measured in coincidence with protons using a five-crystal Compton-polarimeter. Lifetimes were measured atE α=14.6 MeV using the Dopper-shift attenuation method. Unambigious spin-parity assignments were obtained for the levels at 6,865 (3+), 7,001 (5+), 7,079 (3+), 7,810 (4), 9,371 (6+), 7,613 (4−), 8,196 (5−), 8,596 (4−), 8,963 (5−), 9,111 (6−), 9,350 (4−), 9,507 (5−), 9,777 (6−), 10,188 (5−), 10,305 (3−), 10,561 (6−), 10,725 (7−), 11,477 (6−) and 11,544 (7−)keV excitation energy, respectively. The structure of30Si is understood both in terms of the shell model and the collective model. The levels at 5,487, 6,505, 8,196, 9,777 and 11,544keV, respectively, are theI π=3− through 7− members of a well developedK π=3− rotational band with intrinsic quadrupole moment |Q 0|=350 −70 +250 mb. There is evidence of further rotational bands, among them aK π=3− band with |Q 0|=800 −80 +422 mb.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01425158
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