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Träfflista för sökning "WFRF:(Neugart R.) "

Sökning: WFRF:(Neugart R.)

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1.
  • Anne, R., et al. (författare)
  • Dissociation Reactions of the Be-11 One-Neutron Halo - the Interplay between Structure and Reaction-Mechanism
  • 1993
  • Ingår i: Physics Letters B. - 0370-2693. ; 304:1-2, s. 55-59
  • Tidskriftsartikel (refereegranskat)abstract
    • The angular distributions of the forward neutrons in the exclusive (Be-10 + n) channel have been measured. They can be accounted for quantitatively and without free parameters in terms of Coulomb and diffraction dissociation. The results show that the transverse momentum distributions result from an interplay between the tail of the wave function (the halo) and the reaction mechanism.
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2.
  • Anne, R., et al. (författare)
  • Exclusive and Restricted-Inclusive Reactions Involving the Be-11 One-Neutron Halo
  • 1994
  • Ingår i: Nuclear Physics A. - 0375-9474. ; 575:1, s. 125-154
  • Tidskriftsartikel (refereegranskat)abstract
    • Reactions of a 41 MeV/u beam of the radioactive halo nucleus Be-11 have been studied with a counter telescope coupled to an array of neutron detectors covering angles up to 97-degrees. The technique allows to determine single-neutron inclusive and exclusive angular distributions. The targets (Be, Ti and Au) were chosen to illustrate the relative roles played by nuclear and Coulomb mechanisms. The channels leading to Be-10, the dissociation channels, correspond to impact parameters larger than the sum of the radii of the target and the Be-10 core. It is shown that for the dissociation process it is possible to account almost quantitatively for the integral, single- and double-differential cross sections from models without free parameters including the Coulomb, Serber and Glauber (diffraction-dissociation) mechanisms. The neutron distributions from the nondissociative reaction channels show little individuality and it is convenient to group them together as the channel ''neutron plus anything different from Be-10''. We refer to these as ''restricted-inclusive'' reactions. These seem to be a promising tool for obtaining accurate information on the halo wave function in momentum coordinates.
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4.
  • Anne, R., et al. (författare)
  • Projectile Coulomb-Excitation with Fast Radioactive Beams
  • 1995
  • Ingår i: Zeitschrift Fur Physik a-Hadrons and Nuclei. - 0939-7922. ; 352:4, s. 397-401
  • Tidskriftsartikel (refereegranskat)abstract
    • We report a search for gamma rays emanating from Coulomb excitation of fast (30-46 MeV/u) radioactive projectiles He-8, Be-11,Be-12,Be-14 interacting with a lead target. These are clearly identified by their Doppler shift. The 320 keV 1/2(-) --> 1/2(+)gamma transition from Be-11 was observed with a cross-section of 191 +/- 26 mb which is noticeably less than expected from the known lifetime and in the perturbation limit of pure Coulomb excitation. In the other nuclei rather stringent upper limits of 0.01 to 0.2 Weisskopf units, are placed on the hypothetical transition to 1(-) states.
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5.
  • Keller, H., et al. (författare)
  • Search for Forbidden Beta-Decays of the Drip-Line Nucleus Be-12
  • 1994
  • Ingår i: Zeitschrift Fur Physik a-Hadrons and Nuclei. - 0939-7922. ; 348:1, s. 61-62
  • Tidskriftsartikel (refereegranskat)abstract
    • Beta-coincident gamma-rays have been measured from implanted pure samples of Be-12 separated at the LISE3 spectrometer at GANIL. An intensity of 0.040(26)% can be estimated for the branching ratio of the isospin forbidden pure-Fermi transition to the 0+ excited state of B-12 and of 0.008(6) % of the transition to the 1- excited state. Both are taken to represent upper limits. The halflife has been re-measured to be 26.1(2.4) ms.
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6.
  • Nilsson, Thomas, 1965-, et al. (författare)
  • Neutron Momentum Distributions from Core Break-up Reactions of Halo Nuclei
  • 1995
  • Ingår i: Europhysics Letters. - 0295-5075. ; 30:1, s. 19-24
  • Tidskriftsartikel (refereegranskat)abstract
    • Neutron angular distributions from violent break-up reactions of Li-11 and Be-11 have been measured at 28 MeV/u and 280 MeV/u and at 41 MeV/u and 460 MeV/u, respectively. The derived neutron momentum distributions show a narrow component in transverse momentum that is within uncertainties independent of beam energy and target charge. This component is suggested to be simply related to the momentum distribution of the loosely bound halo neutron(s) in the projectiles.
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7.
  • Flanagan, K. T., et al. (författare)
  • Nuclear Spins and Magnetic Moments of Cu-71,Cu-73,Cu-75 : Inversion of pi 2p(3/2) and pi 1f(5/2) Levels in Cu-75
  • 2009
  • Ingår i: Physical Review Letters. - 0031-9007. ; 103:14, s. 142501
  • Tidskriftsartikel (refereegranskat)abstract
    • We report the first confirmation of the predicted inversion between the pi 2p(3/2) and pi 1f(5/2) nuclear states in the nu g(9/2) midshell. This was achieved at the ISOLDE facility, by using a combination of in-source laser spectroscopy and collinear laser spectroscopy on the ground states of Cu-71,Cu-73,Cu-75, which measured the nuclear spin and magnetic moments. The obtained values are mu(Cu-71)=+2.2747(8)mu(N), mu(Cu-73)=+1.7426(8)mu(N), and mu(Cu-75)=+1.0062(13)mu(N) corresponding to spins I=3/2 for Cu-71,Cu-73 and I=5/2 for Cu-75. The results are in fair agreement with large-scale shell-model calculations.
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