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  • 1985-1989  (5)
  • 1975-1979  (3)
  • 1965-1969  (2)
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  • 1
    Digitale Medien
    Digitale Medien
    Proton-neutron quasiparticle RPA and charge-changing transitions (1989)
    Springer
    The European physical journal 333 (1989), S. 125-129 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.60.Jz ; 23.40.Hc
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract General formulae for a proton-neutron QRPA calculation are presented. All terms in the RPA order are retained, and no specific assumptions on the residual interaction and one-body charge-changing transitions are made. QRPA phonon correlations are introduced in first-order perturbation for quasiparticle transitions from odd-mass and odd-odd parent nuclei.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01565141
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  • 2
    Digitale Medien
    Digitale Medien
    Effects of ground-state correlations on 2νββ decay rates and limitations of the QRPA approach (1989)
    Springer
    The European physical journal 334 (1989), S. 177-186 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 23.40-s ; 23.40.Hc ; 21.60.Jz
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Half-lives of the 2νββ decay are calculated in the proton-neutron QRPA for76Ge,82Se,100Mo,128,130Te,136Xe and150Nd. The strength of the particle-particle interaction, which plays a decisive role for a reliable evaluation of the half-lives, is determined from a QRPA calculation of singleβ + decays. The 2ν decay rates calculated with the interaction strength fitted in this way are strongly suppressed and found to be consistent with the existing experimental data. Effects of the ground-state correlations on the suppression are investigated. On the other hand, the present calculation indicates limitations of the QRPA approach.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01294218
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  • 3
    Digitale Medien
    Digitale Medien
    Nuclear structure effects on the neutrinoless double beta decay (1989)
    Springer
    The European physical journal 334 (1989), S. 187-194 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 23.40.−s ; 23.40.Hc ; 21.60.Jz
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The nuclear matrix elements of the 0ν ββ decay of76Ge,82Se,100Mo,128,130Te,136Xe and150Nd are calculated in the proton-neutron quasiparticle RPA with theG-matrix of the Paris potential. It is shown that the matrix elements are not sensitive to details of nuclear structure, in contrast to the 2ν ββ decay. We investigate effects of ground-state correlations and those of short-range correlations on the suppression of the nuclear matrix elements. We also discuss effective values of the neutrino mass which are deduced from experimental 0ν ββ decay half-lives.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01294219
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  • 4
    Digitale Medien
    Digitale Medien
    Microscopic calculations of beta decay far from stability (1989)
    Springer
    The European physical journal 334 (1989), S. 47-57 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 23.40.-s ; 21.60.Cs ; 21.60.Jz
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Beta decay properties of nuclei far from stability are of decisive importance for the understanding of the element synthesis in the universe and the determination of the age of the universe by means of cosmochronometers. A new large scale microscopic calculation ofβ −-decay half-lives up to the neutron drip line is presented. This new approach uses the proton-neutron quasiparticle random phase approximation with a Gamow-Teller residual interaction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01294386
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  • 5
    Digitale Medien
    Digitale Medien
    Eine Quelle für polarisierte Lithiumkerne (1967)
    Springer
    The European physical journal 199 (1967), S. 68-81 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A source for nuclear polarized lithium-6 and -7 ions was built following the method of separation of the atomic hyperfine states in a strong inhomogeneous magnetic sextupole field and ionisation of the selected atoms by electron bombardment in a weak homogeneous field. The velocity distribution of the atomic beam formed by a Laval nozzle and the focussing properties of the sextupole magnet were determined using a mechanical velocity selector. After separation of the two isotopes the ion beam has an intensity of 10−9 ampere. As no background of unpolarized lithium ions was found, a vector polarisation of (32±1)% and (24±1)% for lithium-6 and -7 and a tensor polarisation of (−32±1)% for lithium-6 can be expected.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01326015
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  • 6
    Digitale Medien
    Digitale Medien
    A new possibility of identifying high-spin states at high excitation energies (1979)
    Springer
    The European physical journal 289 (1979), S. 193-196 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A new method of identifying high-spin states at high excitation energies is presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01435937
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  • 7
    Digitale Medien
    Digitale Medien
    Gammaübergänge und Energieniveaus im49V aus der Reaktion48Ti(p, γ)49V (1968)
    Springer
    The European physical journal 210 (1968), S. 457-465 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Deexcitation gamma rays of49V from the48Ti (p, γ)49V reaction have been investigated at the resonancesE p=1007, 1209, 1362 and 1374 keV corresponding to excited states in49V at 7742, 7940, 8090, 8102 keV. A 4 cm2× 0.35 cm lithium-drifted germanium detector was used. The target was TiO2 enriched in48Ti to 99.4%. 71 gamma transitions have been observed. A level scheme of49V is proposed involving 8 new levels in the energy range from 0 to 5.2 MeV excitation energy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02083662
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  • 8
    Digitale Medien
    Digitale Medien
    Structure in the beta strength function of very neutron-rich Rb-isotopes (1979)
    Springer
    The European physical journal 292 (1979), S. 73-77 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The beta strength functionS β is calculated in a schematical Brown-Bolsterli model for the Gamow-Tellerβ − decay of89–99Rb. The position of the peaks inS β resulting from the back spin flip transitions and the calculated life-times are in good agreement with recent experimental results. A simple regularity is found to govern the energy position of the lowest-lying structures inS β. By calculations of the type given here thus it should be possible to produce much more reliable input data concerningS β forr-orn-process calculations than have been used up to now in astrophysical calculations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01434633
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  • 9
    Digitale Medien
    Digitale Medien
    Determination of fission barrier heights from β-delayed fission (1979)
    Springer
    The European physical journal 292 (1979), S. 249-255 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Beta delayed fission (βDF) gives a possibility to investigate the fission barrier for nuclei far off beta stability. However, before any information on the fission barrier can be extracted, the effect of low-lying structures in the beta-strength function (S β) on theβDF branching ratio has to be considered. This is in general not done. In this paper the lowlying structures that occur inS β are discussed and microscopic calculations for the Gamow-Teller strength function are presented for232Th (β −-decay) and232Pu,240Cm,244,248Cf and248Fm (β +-decay). Using the calculated strength functionsβ +DF branching ratios are calculated and compared with the experimental ones. The sensitivity of the results to different shapes ofS β is investigated. It is concluded that, when the expected structures inS β are considered, there are at present no indications fromβ + DF measurements that the errors in the fission barrier calculations are larger than the uncertainty given for those calculations. The difference in magnitude between theβ − DF and theβ +DF branching ratios is also explained by the occurrence of low-lying structures inS β.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01547469
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  • 10
    Digitale Medien
    Digitale Medien
    Spectroscopic information from the63Cu(p, γ)64Zn reaction in the GDR region (1986)
    Springer
    The European physical journal 325 (1986), S. 55-60 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 24.30.Cz
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The proton capture cross sections for the reaction63Cu(p, γi)64Zn leading to several resolved states in the64Zn nucleus have been measured forE p =6.5–11.0 MeV. The excitation functions have been reproduced by the combined CN and DSD models. The extracted spectroscopic factors compared with those derived from the stripping reaction are found to show a distinct correlation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01294242
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