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Träfflista för sökning "WFRF:(Gavrikov Yu.A.) srt2:(2011)"

Sökning: WFRF:(Gavrikov Yu.A.) > (2011)

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1.
  • Scandale, W., et al. (författare)
  • Observation of multiple volume reflection by different planes in one bent silicon crystal for high-energy negative particles
  • 2011
  • Ingår i: Europhysics letters. - : EDP Sciences. - 0295-5075 .- 1286-4854. ; 93:5
  • Tidskriftsartikel (refereegranskat)abstract
    • Multiple volume reflection by different planes passing through the 〈111〉 axis in a bent silicon crystal was observed for the first time for 150 GeV/c negative particles, π- mesons, at one of the secondary beams of the CERN SPS. The beam of π- mesons was deflected opposite to the crystal bend by an angle of about 48 μrad, which is 4.6 times larger than in a single volume reflection by the (110) bent planes. The one-side deflection efficiency was about 65%. Multiple volume reflection transforms to a single volume reflection when the orientation angle of the 〈111〉 axis relative to the beam direction is increased. Copyright © 2011 Europhysics Letters Association.
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2.
  • Ryzhov, I.V., et al. (författare)
  • Fragment-mass distributions in neutron-induced fission of 232Th and 238U at 33, 45, and 60 MeV
  • 2011
  • Ingår i: Physical Review C. Nuclear Physics. - 0556-2813 .- 1089-490X. ; 83:5, s. 054603-
  • Tidskriftsartikel (refereegranskat)abstract
    • We have measured fission fragment-mass yields for neutron-induced fission of Th-232 and U-238 at energies 32.8, 45.3, and 59.9 MeV. The experiments were done at quasimonoenergetic neutron beams of the Cyclotron Research Center at Louvain-la-Neuve. To detect the fission fragments, a multisection Frisch-gridded ionization chamber was used. The measurement and data analysis techniques are discussed in detail. The obtained mass yields are compared to model calculations with the intermediate-energy nuclear reaction code MCFX. The MCFX code is used to calculate the fraction of fissioning nuclei after cascade, preequilibrium, and statistical reaction stages. The formation of mass distributions is considered as a result of oscillations of the mass-asymmetry degree of freedom in the potential well calculated with the temperature-dependent shell correction method. The experimental results as well as the results of the model calculations demonstrate that the probability of symmetric fission increases with incident neutron energy for both nuclei. The comparison also shows that the symmetric fission is more enhanced for thorium than for uranium with increasing neutron energy. We also compare U-238 results with available experimental data; the Th-232 data were measured for the first time.
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