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Spallation neutron spectrum on a massive lead/paraffin target irradiated with 1 GeV protons (2005)

Adam, J. ; Balabekyan, A. R. ; Barashenkov, V. S. ; [et al.]

Springer

The European physical journal 23 (2005), S. 61-68

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ISSN: 1434-601X

Keywords: 28.41.Kw Radioactive wastes, waste disposal ; 29.30.Kv X- and γ-ray spectroscopy ; 02.70.Uu Applications of Monte Carlo methods ; 07.05.Fb Design of experiments

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract. The gamma-ray spectra emitted by decaying of residual nuclei produced by spallation neutrons in (n, xn), (n, xnyp), (n, p), (n, γ) reactions with activation threshold detectors, i.e. 209Bi, 197Au, 59Co, 115In, 232Th, were measured in the Laboratory of Nuclear Problems (LNP), JINR, Dubna, Russia. Spallation neutrons were generated by bombarding a 20 cm long cylindrical lead target with 8 cm diameter surrounded by a 6 cm thick layer of paraffin moderator with 1 GeV proton beam from the NUCLOTRON accelerator. Reaction rates and a spallation neutron spectrum were measured and compared with CASCADE code calculations.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1140/epja/i2004-10031-y

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Neutron and light-charged-particle productions in proton-induced reactions on 208Pb at 62.9 MeV (2005)

Guertin, A. ; Marie, N. ; Auduc, S. ; [et al.]

Springer

The European physical journal 23 (2005), S. 49-60

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ISSN: 1434-601X

Keywords: 27.80.+w 190 ⩽ A ⩽ 219 ; 25.40.-h Nucleon-induced reactions ; 25.40.Sc Spallation reactions

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract. Neutrons and light charged particles produced in 62.9MeV proton-induced reactions on 208Pb were measured during a single experiment performed at the CYCLONE facility in Louvain-la-Neuve (Belgium). Two independent experimental set-ups were used to extract double differential cross-sections for neutrons, protons, deuterons, tritons, 3He and alpha-particles. Charged particles were detected using a set of Si- Si- CsI telescopes from 25° to 155°, by step of 10 degrees. Neutrons were measured using shielded DeMoN counters, liquid NE213 scintillators, at 24°, 35°, 55°, 80° and 120°. These data allowed the determination of angle differential, energy differential and total production cross-sections. A comparison with theoretical calculations (MCNPX, FLUKA and TALYS) has been performed. It shows that the neutron and proton production rates are well predicted by MCNPX, using the INCL4 option. All the other codes underestimate the neutron production whereas they overestimate the proton one. For composite particles, which represent 17% of the charged particle total reaction cross-section, neither the shape nor the amplitude of the cross-sections are correctly predicted by the models.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1140/epja/i2004-10073-1

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Coexisting oblate and strongly triaxial structures in 191Pt (2005)

Kutsarova, T. ; Schück, C. ; Gueorguieva, E. ; [et al.]

Springer

The European physical journal 23 (2005), S. 69-78

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ISSN: 1434-601X

Keywords: 29.30.Kv X- and γ-ray spectroscopy ; 23.20.Lv γ transitions and level energies ; 21.60.Ev Collective models ; 27.80.+w 190 ⩽ A ⩽ 219

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract. Excited states in 191Pt have been populated using the reaction 186W + 11B at 85MeV beam energy. Gamma-ray coincidences were measured using the EUROGAM-II spectrometer array. The level scheme has been extended considerably. Evidence for favoured structures of highly triaxial shape with γ ∼ -90° coexisting with oblate structures has been obtained by comparison with total Routhian surface and cranked shell model calculations. The presence of proton excitations in both positive- and negative-parity states has been confirmed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1140/epja/i2004-10065-1

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