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  • 1
    Digitale Medien
    Digitale Medien
    Steady flow approximations to the heliumR-process (1983)
    Springer
    Astrophysics and space science 91 (1983), S. 221-234 
    Details
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract R-process yields for a helium layer have been calculated within a network of 6033 heavy nuclei using a steady flow approximation. The calculation of the neutron capture cross sections has been improved. The beta decay rates computed by Klapdor and his colleagues have been used in the calculation. We find that ther-process yield peaks near mass numbers 80 and 130 require a neutron number density of approximately 1020 cm−3 and a freezing time comparable to or less than 0.1 s. The peak near mass number 195 requires a neutron number density of about 1021 cm−3 and a freezing time comparable to or less than about 0.01 s. The individual yield features of the steady flowr-process depend entirely upon the neutron capture cross sections of the nuclei along the flow path and the beta decay rates, which can shift the flow path and thereby introduce inappropriate capture cross sections into the determination of the yields.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00656111
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  • 2
    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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  • 3
    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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  • 4
    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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  • 5
    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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  • 6
    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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  • 7
    Digitale Medien
    Digitale Medien
    Beta-delayed fission and neutron emission: Consequences for the astrophysicalr-process and the age of the galaxy (1983)
    Springer
    The European physical journal 309 (1983), S. 301-317 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Beta-delayed neutron emission and beta-delayed fission probabilities (P n andP β d j ) were calculated for neutron-rich nuclei between the beta stability line and the neutron-drip line in the range 10≦Z≦100 and 75≦Z≦100, respectively. These results were obtained by applying recentβ-strength function calculations, fission barrier height predictions, and a neutron optical potential from infinite nuclear matter calculations. An area of ∼100% fission probability is predicted around Z=94,N=168 extending beyond the well-known island of spontaneous fission in that region. Astrophysicalr-process calculations were performed including the calculatedP n and Pβ d f values. This puts the method to determine the age of the Galaxy by the actinide chronometers on a reliable basis. An excellent overall agreement with the observedr-abundance distribution is obtained. The predictedr-process production ratios for the Chronometrie pairs232Th/238U,235U/238U and244Pu/238U result in an age of the Galaxy oft G =(20.8± 4 2 )×109 a, which is by almost a factor two larger than earlier predictions by this method, but in accordance with recent astronomical observations from globular clusters. The predicted island of 100%β-delayed fission acts as a sink to ther-process with the consequence that no superheavy elements are produced in nature.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01413833
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  • 8
    Digitale Medien
    Digitale Medien
    Proton-Gamma-Winkelverteilungen an der Reaktion19F(p, α γ)16O (1970)
    Springer
    The European physical journal 236 (1970), S. 424-429 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The angular distributions of the 6.13 MeV γ1 transition in the reaction19F(p, α γ)16O have been measured with improved accuracy at proton energies of 873 keV and 1,374 keV using a Ge(Li) detector. The results can be fitted by Legendre polynom series witha 2=−0,018±0.008;a 4=0.000±0.008 atE p =873 keV anda 2=−0.130±0.005;a 4=+0.004±0.004 atE p =1,374 keV. From the measured Legendre coefficients α1-angular momentum mixing ratios are extracted and compared with the results from (p, α1) and (α1, γ1) correlations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01394134
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  • 9
    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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  • 10
    Digitale Medien
    Digitale Medien
    High spin states in106in (1981)
    Springer
    The European physical journal 301 (1981), S. 29-34 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract High spin states have been investigated by the reaction90Zr(19F, 3nγ), using an Anticompton spectrometer device, for the nucleus106In, for which no in-beamγ-spectroscopic information was available up to now. A level scheme has been constructed up to anI =(13,14) state.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01412460
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