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Träfflista för sökning "(WFRF:(Hansen M. S.)) srt2:(1995-1999)"

Sökning: (WFRF:(Hansen M. S.)) > (1995-1999)

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  • Marques, F. M., et al. (författare)
  • Neutrons from the breakup of C-19
  • 1996
  • Ingår i: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. - 0370-2693. ; 381:4, s. 407-412
  • Tidskriftsartikel (refereegranskat)abstract
    • Neutrons arising from the breakup of a 30 MeV/nucleon C-19 beam on a tantalum target have been measured using the 98 element array DEMON. A narrow, forward peaked neutron angular distribution, with a corresponding momentum spread considerably smaller than those measured simultaneously for N-21, O-22 and F-24 was observed for charged fragments with Z
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  • Anne, R., et al. (författare)
  • Projectile Coulomb-Excitation with Fast Radioactive Beams
  • 1995
  • Ingår i: Zeitschrift fur Physik A Hadrons and Nuclei. - 1431-5831 .- 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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  • Grevy, S., et al. (författare)
  • Core-breakup reactions of the halo nuclei Be-11 and Li-11: momentum distributions and shadow effects
  • 1999
  • Ingår i: Nuclear Physics A. - 0375-9474. ; 650:1, s. 47-61
  • Tidskriftsartikel (refereegranskat)abstract
    • The halo nuclei Be-11 and Li-11 have been studied in core-breakup reactions where the halo neutrons are expected to be released without a major distortion due to the reaction. The widths of the halo-neutron momentum distributions have been extracted in coincidence with He fragments, Gamma = 32 +/- 4 MeV/c, and Li fragments, Gamma = 42 +/- 4 MeV/c for Be-11 and with He fragments, Gamma =42+/-6 MeV/c for Li-11. The Be-11 breakup gives a very low neutron multiplicity of 0.38+/-0.09 which is a manifestation of the shadowing of the neutron in the core-breakup reaction. This value can be understood from a simple theoretical calculation, which also accounts for the observed transverse momentum widths at small angles. (C) 1999 Elsevier Science B.V.
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  • Proff, S, et al. (författare)
  • Electromagnetic polarizabilities of nucleons bound in 40Ca, 16O and 4He
  • 1999
  • Ingår i: Nuclear Physics A. - 0375-9474. ; 646:1, s. 67-82
  • Tidskriftsartikel (refereegranskat)abstract
    • Differential cross sections for elastic scattering of photons have been measured for 40Ca at energies of 58 and 74 MeV and for 16O and 4He at 61 MeV, in the angular range from 45° to 150°. Evidence is obtained that there are no significant in-medium modifications of the electromagnetic polarizabilities except for those originating from meson exchange currents.
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  • Resultat 1-10 av 13

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