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  • 2.60+y  (1)
  • 21.10.-k  (1)
  • 23.20.−g  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Intrastate γ-transitions: A spectroscopic tool? (1987)
    Springer
    The European physical journal 328 (1987), S. 291-299 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 23.20 ; 21.10.-k
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract In the framework of a potential model we have calculated the various bremsstrahlung cross sections into the5Li ground state, includingM 1 andE 2 γ-transitions leading from the high energy wing of the5Li ground state resonance into states belonging to the same resonance at lower energy (intrastate transition). Our calculation supports the hypothesis of Schmalbrock et al. [1] that intrastate transitions ofM 1 andE 2 multipolarity exist. While we find a maximum cross section of roughly 1.4 nb for theE 2 transition, we predict the cross sections forM 1 intrastate transition to be less than 3·10−5nb. An experimental observation of the intrastate γ-ray emission appears to be very difficult due to the dominance of competing resonant (M 1) and direct (E 1) capture processes. Schmalbrock et al. have suggested to deduce magnetic dipole and electric quadrupole moments of resonant states from the measurements of the respectiveM 1 andE 2 intrastate transitions. We will show that theM 1 intrastate cross sections do not yield the appropriate information to determine the magnetic dipole moment. We will also discuss thatE 2 intrastate transitions do not seem to be a suited tool to find the quadrupole moment of an unstable state.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01290497
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  • 2
    Digitale Medien
    Digitale Medien
    The low-energyD(α, γ)6Li and6Li+208Pb→D+α+208Pb cross sections (1991)
    Springer
    The European physical journal 339 (1991), S. 335-339 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.60.Gx ; 23.20.−g ; 25.55.−e
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have calculated theE1 andE2 contributions to the low-energyD(α,γ)6Li fusion and to the6Li+208Pb →D+α+208Pb Coulomb dissociation cross sections within a multichannel Resonating Group calculation based on many-body deuteron+α configurations and pseudo-states. For both reactions experimentally determined cross sections are reasonably well reproduced. We find that dipole capture contributes noticeably to the fusion cross sections atE≦500 keV, while it is negligible in the Coulomb dissociation data.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01560634
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  • 3
    Digitale Medien
    Digitale Medien
    Path integral Monte Carlo calculations of4He and6Li (1985)
    Springer
    The European physical journal 321 (1985), S. 677-685 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 2.60+y ; 21.40.+d
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have performed Monte Carlo calculations to estimate the exact energies of model problems for4He and theL=0,1, and 2 states of6Li. Using a Feynman path-integral expression for the imaginary-time evolution operator, we recast the ground state energy as a sum over histories, which are then sampled stochastically. Use of a trial wave function dramatically improves the efficiency of the Monte Carlo method. For a state-independent Malfliet-Tjon potential, together with the Coulomb interaction, we find a ground state energy of −28.00+0.20 MeV for4He, and a degeneracy of theL=0,1, and 2 states in6Li at about −59.65+-0.50 MeV. Density distributions for these nuclei are also calculated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01432445
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