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  • 1995-1999  (4)
  • 1985-1989  (1)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Extraction of the Neutron-Neutron Scattering Length a nn from Kinematically Complete Neutron-Deuteron Breakup Experiments (1996)
    Springer
    Few body systems 20 (1996), S. 81-92 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Data for the neutron-neutron final-state-interaction cross section obtained recently in a kinematically complete neutron-deuteron breakup experiment have been reanalyzed using rigorous solutions of the three-nucleon Faddeev equations with realistic nucleon-nucleon interactions. A discrepancy was found with respect to a recent analysis based on the W-matrix approximation to the Paris potential. We also estimate theoretical uncertainties in extracting the neutron-neutron scattering length resulting from the use of different nucleon-nucleon interactions and the possible action of the two-pion-exchange three-nucleon force. We find that there exists a certain production angle for the interacting neutron-neutron pair where the uncertainties become minimal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s006010050033
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Comparisons of vector analyzing-power data and calculations for neutron-deuteron elastic scattering from 10 to 14 MeV (1987)
    Springer
    Few body systems 2 (1987), S. 19-32 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High-accuracy analyzing-powerA y(θ) data forn-d elastic scattering at 12 MeV have been measured using the polarized-neutron facilities at the Triangle Universities Nuclear Laboratory (TUNL). The present data have been combined with our previousn-d measurements at 10, 12, and 14.1 MeV to form the highest-accuracyA y(θ) data set forn-d elastic scattering below 20 MeV. These data are compared to recent Faddeev-based neutron-deuteron (n-d) calculations which use the Paris and Bonn equivalent separable potentials PEST and BEST, as well as Doleschall's representation of theP- andD-wave nucleon-nucleon interactions. None of these models adequately describe the data in the angular region around the maximum ofA y(θ). Possible reasons for the discrepancies are discussed. The sensitivity of the present Faddeev-based calculations to various angular momentum components of the nucleon-nucleon interaction are examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01078989
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Measurements at Low Energies of the Polarization-Transfer Coefficient for the Reaction H He at (1998)
    Springer
    Few body systems 24 (1998), S. 27-38 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Measurements of the transverse polarization-transfer coefficient for the reaction H He are reported for outgoing neutron energies of 1.94, 5.21, and 5.81 MeV. This reaction is important both as a source of polarized neutrons for nuclear-physics experiments, and as a test of theoretical descriptions of the nuclear four-body system. Comparison is made to previous measurements, confirming that the H He reaction can be used as a polarized neutron source with the polarization known to an accuracy of approximately 5%. Comparison to R-matrix theory suggests that the sign of the phase-shift parameter is incorrect. Changing the sign of this parameter dramatically improves the agreement between theory and experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s006010050074
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Determinations of the Neutron-Neutron Scattering Length a nn from Kinematically Incomplete Neutron-Deuteron Breakup Data Revisited (1996)
    Springer
    Few body systems 21 (1996), S. 97-130 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We review published analyses of the final-state-interaction enhancement observed in proton energy distributions obtained from kinematically incomplete neutron-deuteron breakup experiments. We compare the results derived from these analyses for the neutron-neutron scattering length, a nn , with our results based on a rigorous treatment of the three-nucleon Faddeev equations in conjunction with the use of realistic nucleon-nucleon potentials. Our values for a nn deviate outside the quoted uncertainties from the ones obtained in the previous analyses where simplified nucleon-nucleon interaction models were employed. In contrast to the previous determinations, the present results for a nn are in clear disagreement with the values for a nn based on π−-deuteron capture experiments. Unless inconsistencies in the experimental neutron-deuteron breakup data at low energies can be resolved and the neutron-deuteron breakup data at low energies can be resolved and the influence of possible three-nucleon-force effects can be reliably determined, we recommend that one not resort to the kinematically incomplete neutron-deuteron breakup reaction as a tool for determining a quantity as important for nuclear and particle physics as is the neutron-neutron scattering length a nn .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s006010050043
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Determination of the 3Pj Phase Shifts from Nucleon-Nucleon Data: A Critical Evaluation and a Surprising Result (1999)
    Springer
    Few body systems 26 (1999), S. 1-26 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract  It is shown that the neutron-proton (proton-proton) phase shifts cannot be determined to less than % ( %) uncertainty at low energies ( MeV), even if high-accuracy nucleon-nucleon data were to become available for currently inaccessible observables. For a more accurate determination, appropriate theoretical constraints have to be invoked, but their accuracy can be judged only from the comparison of rigorous three-nucleon continuum calculations with particular three-nucleon observables.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s006010050103
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    Paper (German National Licenses)
    Fulltext
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