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  • 1985-1989  (6)
  • 1
    Electronic Resource
    Electronic Resource
    M1 Character of unresolved continuum transitions from X-ray multiplicity measurements (1985)
    Springer
    The European physical journal 321 (1985), S. 275-286 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have measured the X-ray multiplicities of the transitions deexciting the quasi-continuum region as a function of the input spin for deformed and transitional erbium isotopes obtained in (40Ar,xn) reactions. Combined withγ-ray angular distribution studies, these measurements clearly show the occurrence of a magnetic dipole component in the energy region 300–800keV. The spin dependence of this “bump” is quite different in deformed and transitional nuclei. In the latter case, a sudden increase in the quasi-continuumK electron multiplicity arises for spins higher than 35ħ and is strongly correlated to the occurrence of collective modes in these nuclei at the same spins. It is suggested to correspond to collective behavior of bands built on yrast states of single particle nature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01493449
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Decay properties of very-high-spin states in transitional Er nuclei aroundA=154 (1986)
    Springer
    The European physical journal 324 (1986), S. 107-116 
    Details
    ISSN: 1434-601X
    Keywords: 25.70 ; 21.10M ; 23.20C
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Theγ ray continuum structures of the transitional Er isotopes withA∼154 are studied using the reaction74Ge(84Kr,xn)158−xEr atE lab=340 MeV. The measurements include energy spectra, total energies, multiplicities, angular distributions and lifetimes using the DSAM method. The analysis of data confirms the previously observed two-bump structure of the continuum radiation. A meticulous subtraction of discrete contributions proves the persistence of the low-energy bump even at high spins, i.e.I〉40ħ. The angular-distribution measurements assign predominant dipole structure to the bump atE γ=0.65 MeV, whereas the bump atE γ=1.3 MeV is of almost pure quadrupole character at high spins. The lifetime measurements give evidence for a strong enhancement of theB(E2) values of the upper bump,B(E2)/B sp〉130. Spin-selection studies reveal, in the spin rangeI=30−50ħ an almost constant energy for the 1.3 MeV bump,ΔE〈60 keV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290761
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Shape coexistence at high spin in187Au (1989)
    Springer
    The European physical journal 333 (1989), S. 5-14 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Re ; 23.20.Lv ; 27.70.+q
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High-spin states in187Au have been populated in the172Yb(19F, 4n) reaction and studied with in-beam spectroscopic techniques using the “Château de Cristal” 4π-multidetector array. A comprehensive level scheme of187Au has been established. Experimental band crossing frequencies and gains in alignment were deduced. Shape coexistence in187Au, well established at low spin, is found to survive up to spin 57/2, and manifests itself through well separated oblate and prolate structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290104
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Shape coexistence in187Hg (1986)
    Springer
    The European physical journal 325 (1986), S. 371-372 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Excited states of187Hg have been investigated via the164Dy (28Si,5n) reaction by means of in- beam gamma-ray spectroscopy using the multidetector 4π away “Ckāteau de. Cristal”. Different bands were populated up to spin I- 45/2. Coexistence of both prolate and oblate structures is observed for the first time in an odd- A Hg isotope. The crossing of aligned and strongly coupled sequences of levels built on the vi13/2 orbital infers the near degeneracy of oblate and prolate structures in187Hg.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294622
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Collective structures in185Hg (1988)
    Springer
    The European physical journal 330 (1988), S. 15-22 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Re ; 23.20. Lv ; 27.70. +q
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Excited states of185Hg have been investigated via the161Dy(28Si, 4n) reaction at 145 MeV. In-beamγ-ray spectroscopic studies have been performed with the “Château de Cristal” 4π-multidetector array. A level scheme of185Hg has been established. Shape coexistence, still present in185Hg like in the neighbouring Hg isotopes, manifests itself through a weakly populated decoupled band built on the 13/2+ isomer and three strongly-coupled bands built on the prolate 1/2− [521], 7/2− [514], and 9/2+ [624] Nilsson states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01287258
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  • 6
    Electronic Resource
    Electronic Resource
    Competition between few nucleon emission andγ-ray deexcitation for the reaction systems65Cu+87Rb and40Ar+110Pd (1985)
    Springer
    The European physical journal 322 (1985), S. 393-414 
    Details
    ISSN: 1434-601X
    Keywords: 24.60. Dr ; 25.70. Gh ; 25.70. Jj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Bothγ-ray and neutron emission have been studied for the reaction systems65Cu(237MeV) +87Rb→152Dy* and40Ar(158MeV)+110Pd→150Gd*. By using a sum spectrometer in coincidence with neutron counters, Ge(Li) or Nal detectors, we have measured the totalγ-ray energy and the average totalγ-multiplicity distributions as well as the neutron spectra for various exit channels. These measurements provide strong evidence for thermal equilibrium in reactions involving a small number of emitted neutrons (i.e.87Rb(65Cu,n or 2n)) at rather high excitation energy (∼54MeV). This statistical emission of only a few neutrons is controlled by very strong y-ray competition: theγ-entry line is found not to be parallel to the yrast line. Instead the energy gap is about 8MeV for J∼27ħ and rises to at least 13MeV for J∼36ħ. There are some indications that the main part of the energy from this gap is removed by statisticalγ-ray cascades. The main features of the experimental data for both entrance channels are well reproduced by statistical model calculations with proper attention to the yrast line position and an adjustement of the dipoleγ-ray normalization coefficient. It is conceivable that the y-ray enhancement that we introduce may be related to a lack of knowledge of the absolute level densities at high energy and spin, or possibly to the presence of new or additional degrees of freedom that may enter into the competition between neutron andγ-ray emission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412074
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    Paper (German National Licenses)
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