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  • 1990-1994  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Spin-flipβ − decay of even-even deformed nuclei110Ru and112Ru (1991)
    Springer
    The European physical journal 340 (1991), S. 21-28 
    Details
    ISSN: 1434-601X
    Keywords: 27.60.+j ; 23.20.Lv ; 29.30.Fq ; 23.40.Hc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Neutron-rich nuclides110Ru and112Ru produced in symmetric fission of238U by 20 MeV protons have been studied at the IGISOL facility by means ofβ-ray,γ-ray and conversion electron spectroscopy. A total of 12 and 6γ-transitions were observed in the decays of110Ru and112Ru, respectively. Multipolarities were determined for a few transitions. The beta decay half-life was determined to be 11.6±0.6 s for110Ru and 1.75±0.07 s for112Ru. As a side product, a new value of 2.1±0.3 s for theβ half-life of the112Rh 1+ state was obtained. The decay energy measured with the plastic scintillator was 2.81 ±0.05 MeV for110Ru and 4.52 ±0.08 MeV for112Ru. The beta decay schemes of110Ru and112Ru isotopes indicate that the main fraction of their beta strength resides in two 0+→1+ spin-flip transitions with their logf t values between 4.4 and 4.7. The decay energies and the energies of the 1+ GT states are compared with the macroscopic-microscopic model calculations. The observed GT-strengths are discussed in the framework of the deformed single-particle model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01284476
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Rescattering production of dileptons in nucleus-nucleus collisions (1990)
    Springer
    The European physical journal 46 (1990), S. 141-145 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present a space-time formulation for the rescattering of hard partons produced in primary QCD subcollisions within a nucleus-nucleus collision. As an application we calculate the rescattering rate for dilepton production in 100 GeV/A+100 GeV/A uranium-uranium collisions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02440844
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Alpha decay of the new isotopes207, 208Ac (1994)
    Springer
    The European physical journal 348 (1994), S. 151-152 
    Details
    ISSN: 1434-601X
    Keywords: 23.60.+e −25.70.-z −27.80.+w
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two new neutron-deficient isotopes207,208Ac have been produced in fusion reactions with 5.2–5.6 MeV/nucleon40Ar ions on175Lu and identified on the basis of genetic correlations. The fusion evaporation products were separated on-line using a gas-filled magnetic recoil separator. The alpha energy and half-life of208Ac were determined to be (7572±15) keV and (95 −16 +24 ) ms, respectively. A new alpha line with a half-life of (25 −5 +9 ) ms and an energy of (7758±20) keV is assigned to the decay of an isomeric state in208Ac. Another new activity with a half-life of (22 −9 +40 ) ms and an alpha energy of (7712±25) keV is assigned to207Ac.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289604
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    First observation of the beta decay of117Pd and the discovery of a new isotope119Pd (1991)
    Springer
    The European physical journal 338 (1991), S. 291-294 
    Details
    ISSN: 1434-601X
    Keywords: 23.40.Hc ; 25.85.Ge ; 27.60.+j
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper we wish to report the first direct observations of the beta decays of117Pd and of a new isotope119Pd. The measuredβ-half-life is 4.3±0.3 s for117Pd. For119Pd, the existence of two beta-decaying states with the same half-life but of opposite parity cannot be excluded. The measured half-life for119Pd is 0.92±0.13 s. The observed beta half-lifes are in good agreement with the QRPA predictions. The observed level structure of117Ag and119Ag are discussed in the frame of the level systematics of the known odd Ag isotopes closer to stability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01288192
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Time evolution of the fields associated with a cosmic string (1990)
    Springer
    The European physical journal 46 (1990), S. 117-123 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The time development of the fields associated with a straight cosmic string in the localU(1) model is studied numerically in an expanding universe. The effective potential is time dependent due to the cooling of the universe. After the spontaneous breaking of theU(1) symmetry the fields start to oscillate as the system tends towards the static state of the stable Nielsen-Olesen string. It is shown that energy flows out of the comoving cylinder in the form of electromagnetic waves. Due to Hubble damping and energy outflow the oscillation amplitudes decrease but static fields are not obtained without additional damping terms originating, e.g., from particle production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02440840
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Shadowing effects on quark and gluon production in ultrarelativistic heavy ion collisions (1991)
    Springer
    The European physical journal 51 (1991), S. 633-642 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A framework for including shadowing effects to quark and gluon production in very high energy nucleus-nucleus collisions is given. A formalism for impact parameter dependent nuclear structure functions of partons is introduced and, using two models to describe the average shadowing corrections to the parton number densities, the average numbers and the transverse energy spectrum of hard partons produced inU+U collisions at RHIC and LHC energies are computed. We conclude that shadowing and also the impact parameter dependence of structure functions should be taken into account at very high energies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01565590
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    Paper (German National Licenses)
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