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  • Digitale Medien  (25)
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  • Digitale Medien  (25)
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  • 1
    Digitale Medien
    Digitale Medien
    Line shapes of particle spectra after γ emission in flight (1978)
    Springer
    The European physical journal 285 (1978), S. 371-377 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The energy shifts in the particle energy due theγ-recoil of an excited state decaying in flight are discussed. Formulae are derived which allow the extraction of spin populations of the decaying state from the line shape in the particle spectrum. Various effects due to kinematics and non-isotropic differential cross section are considered. In most cases a simple extraction of the alignment of nuclear states is possible from a fit to the line shape.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01813237
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  • 2
    Digitale Medien
    Digitale Medien
    Spin alignment and polarisation in the (16O,15N) transfer reactions (1979)
    Springer
    The European physical journal 291 (1979), S. 151-161 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The spin alignment of the15N 3 2/* (6.33 MeV) state was measured in the88Sr(16O,15N)89Y reaction atE L =96 MeV using theγ-recoil method. Angular distributions of excited states in15N and89Y were measured with high accuracy. The analysis in terms of DWBA shows that the spin alignment is correctly described by the usual reaction models. The polarisation of the outgoing15N1/2(GS) and15N 3 2/* (6.33 MeV) is discussed. It is shown that cross section differences for transitions to final states with different configurations are sensitive to a spin-orbit potential of15N. The strength and sign of the spin-orbit potential for15N is determined.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01437995
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  • 3
    Digitale Medien
    Digitale Medien
    Them-state population of12C2+ in inelastic scattering (1979)
    Springer
    The European physical journal 292 (1979), S. 105-106 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The spin alignment of the12C2 + state in inelastic scattering of12c on64zn at EL=65 MeV has been measured using the γ-recoil-in-flight method. Good agreement with coupled channel calculations are obtained. The sensitivity of the spin alignment to reaction models is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01434636
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  • 4
    Digitale Medien
    Digitale Medien
    Structures in the excitation functions for compound reactions in the12C+14C system (1973)
    Springer
    The European physical journal 260 (1973), S. 271-282 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Excitation functions for the elastic scattering of12C on14C and the reactions14C(12C, α)22Ne,14C(12C,t)23Na and14C(12C,d)24Na have been measured in the vicinity of the Coulombbarrier. Strong fluctuations of the differential cross sections as a function of incident energy are observed in the α-particle, triton and deuteron channels. The total yield in the three different channels shows correlated structures at energiesE c.m.=6.8, 7.2 and 8.3 MeV. This phenomenon is similar to the structures observed in the12C+12C reactions and indicates the possible presence of resonances in the entrance channel.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01396019
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  • 5
    Digitale Medien
    Digitale Medien
    Measurement of spin-alignment of excited12C2+ nuclei in interactions of16O with12C usingγ-decay in flight (1978)
    Springer
    The European physical journal 285 (1978), S. 379-388 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Measuring energy spectra of nuclei afterγ-decay of excited states in flight the spin alignment of12C2+ states has been measured. Inelastic scattering,16O(16C,12C2+)16O and the reaction12C(16O,12C2+)16O leading to12C2+ (4.43 MeV) state have been studied. Characteristic line shapes of the12C2+ peak were observed using a Q3D magnetic spectrometer. The magnetic substate (m-states) population has been deduced from the spectra as function of reaction angle. A comparison of the measuredm-state population with reaction models shows that the first reaction is consistent with inelastic scattering although discrepancies remain. Discrepancies are also obtained if the reaction12C(16O,12C2+)16O is interpreted using a FRDWBA transfer calculation. At least 1/3 of the cross section can be attributed toα-transfer. A calculation which couples transfer and inelastic scattering channels seems to be necessary.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01813238
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  • 6
    Digitale Medien
    Digitale Medien
    Observation of the nuclear rainbow scattering for12C+12C atE Lab =300 MeV (1982)
    Springer
    The European physical journal 308 (1982), S. 121-131 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The elastic and inelastic scattering of12C on12C has been measured in the angular range between 2.8° and 70.4° in the c.m. system atE Lab =300 MeV. Optical model calculations have been performed with Woods-Saxon and folded potentials, the ground state and the first 2+-state were coupled in the calculations. The large cross sections of the elastic scattering at large angles is related to the nuclear rainbow scattering, which is centered at about 56°. This requires a potential depth of 100 MeV at a distance of 3 fm, the fit to the data is sensitive down to this region. The calculations with the folded potential show a better agreement with the data than those with the Woods-Saxon shape. The total reaction cross section of 1,420 mb, obtained from the optical model analysis, corresponds to the geometrical value; no transparency is observed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01413002
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  • 7
    Digitale Medien
    Digitale Medien
    Study of reaction asymmetries and spin orbit interaction of13C and11B in (12C,13C) and (12C,11B) reactions on208Pb (1984)
    Springer
    The European physical journal 315 (1984), S. 81-89 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Angular distributions of neutron pick-up and proton stripping reactions in the interaction of12C on208Pb have been studied atE L =101 MeV with high accuracy using aQ3D magnetic spectrometer. Angular distributions of the single particle states are discussed in terms of reaction asymmetriesA ij (Θ). With these quantities the relative changes of the shapes of angular distributions can be studied in detail. The transferedl-value has been found to have a large effect on the shapes. For the case of13C an overall description of this quantity is obtained, if a spin-orbit interaction for13C is introduced with a sign which is opposite to that found in (14C,13C) reactions. For the case of11B the reaction asymmetries cannot be described by a spin-orbit interaction. The possible origin of the spin-orbit effects is discussed. The particular discrepancies to a simple DWBA description (without spin-orbit interaction) found in both the13C and11B angular distributions must be attributed to coupling effects in the initial channel, where the 2+ state of12C and 3− state of208Pb are excited, and to smaller extend to higher order couplings in the final channel.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01436212
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  • 8
    Digitale Medien
    Digitale Medien
    Selection of cold transfer and enhanced neutron-pair transfer in the 206 Pb + 118 Sn reaction (2003)
    Springer
    The European physical journal 20 (2003), S. 153-156 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract. The neutron transfer in a very heavy asymmetric nuclear system, in 206 Pb + 118 Sn has been measured using particle- $\gamma$ coincidence techniques with position-sensitive detectors, 5 EUROBALL-Cluster detectors (EB) and the Heidelberg-Darmstadt NaI-CRYSTAL BALL (CB). The fragments are identified via the known $\gamma$ -decays of the lowest excited states using the high resolution of EB. Using the unique feature of the set-up with the CB, transfer to well-defined final channels with known quantum numbers is selected using the high-efficiency multiplicity filter of the CB with no second $\gamma$ -ray, i.e. without feeding. The enhancement in the two-neutron transfer is deduced, for population of the low-lying super-fluid 2 + states in 120 Sn and 116 Sn, while the 2n-transition remains in the ground state for the recoiling 20X Pb-nuclei. Large enhancements up to EF $\simeq 10^3$ are observed. This is the first observation of neutron pair-transfer enhancement for a heavy nuclear binary system with superfluid properties with experimentally separated levels.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epja/i2002-10342-y
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  • 9
    Digitale Medien
    Digitale Medien
    Interaction of 80 MeV12C with88Sr; Neutron transfer, inelastic scattering and spin alignment of the 2+ State of12C (1982)
    Springer
    The European physical journal 305 (1982), S. 135-142 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Using a Q3D magnetic spectrometer the elastic and inelastic scattering of12C on88Sr and the neutron pick-up (12C,13C) has been studied. The spin alignment of the inelastically excited 2+ state of12C (4.43 MeV) has been deduced from the line shapes broadened by theγ-decay in flight. Thus for eachm-substate a full angular distribution was obtained. Them=1 substate shows a shifted interference minimum, which is explained by the different strength of the Coulomb and nuclear amplitudes in them-substates. The analysis of the data on elastic scattering, inelastic scattering, alignment and the neutron transfer can be described consistently with one choice of the optical model parameters.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01415021
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  • 10
    Digitale Medien
    Digitale Medien
    Elastic scattering of15N on19F,19F on18O and19F on16O at low energies and elastic transfer (1973)
    Springer
    The European physical journal 261 (1973), S. 283-304 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Angular distributions of the elastic scattering in the range of 30–160 ° θ cm have been measured for the systems15N+19F,19F+16O and19F+18O at three energies, the highest being approximately 4 MeV above the Coulomb barrier. The large differences observed in the structure of the angular distributions at large angles are discussed considering elastic transfer, and the angular momentum balance for the possible direct surface reactions. The analysis yields a consistent description of the data in terms of elastic transfer.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01399327
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