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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. ; [weitere]

Springer

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

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ISSN: 1434-601X

Schlagwort(e): 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

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: 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.

Materialart: Digitale Medien

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

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Digitale Medien

On kaonic deuterium. Quantum field-theoretic and relativistic covariant approach (2005)

Ivanov, A. N. ; Cargnelli, M. ; Faber, M. ; [weitere]

Springer

The European physical journal 23 (2005), S. 79-111

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ISSN: 1434-601X

Schlagwort(e): 11.10.Ef Lagrangian and Hamiltonian approach ; 11.55.Ds Exact S matrices ; 13.75.Gx Pion-baryon interactions ; 36.10.-k Exotic atoms and molecules (containing mesons, muons, and other unusual particles)

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract. We study kaonic deuterium, the bound K-d state AK d. Within a quantum field-theoretic and relativistic covariant approach we derive the energy level displacement of the ground state of kaonic deuterium in terms of the amplitude of K-d scattering for arbitrary relative momenta. Near threshold our formula reduces to the well-known DGBT formula. The S-wave amplitude of K-d scattering near threshold is defined by the resonances Λ(1405), Σ(1750) and a smooth elastic background, and the inelastic channels K-d → NY and K-d → NYπ, where Y = Σ±,Σ{0} and Λ{0}, where the final-state interactions play an important role. The Ericson-Weise formula for the S-wave scattering length of K-d scattering is derived. The total width of the energy level of the ground state of kaonic deuterium is estimated using the theoretical predictions of the partial widths of the two-body decays AKd → NY and experimental data on the rates of the NY pair production in the reactions K-d → NY. We obtain Γ{1s} = (630±100)eV. For the shift of the energy level of the ground state of kaonic deuterium we predict ε{1s} = (325±60)eV.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1140/epja/i2004-10055-3

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Search for spontaneous transition of nuclei to a superdense state (2005)

Bernabei, R. ; Belli, P. ; Cappella, F. ; [weitere]

Springer

The European physical journal 23 (2005), S. 7-10

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ISSN: 1434-601X

Schlagwort(e): 21.10.Ft Charge distribution ; 21.10.-k Properties of nuclei; nuclear energy levels ; 21.65.+f Nuclear matter ; 29.40.Mc Scintillation detectors

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract. We report the results of an experimental search for spontaneous transition of nuclei from ordinary to superdense state in NaI(Tl). New limits on the superdense-state parameters are presented.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1140/epja/i2004-10072-2

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

Kutsarova, T. ; Schück, C. ; Gueorguieva, E. ; [weitere]

Springer

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

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ISSN: 1434-601X

Schlagwort(e): 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

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: 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.

Materialart: Digitale Medien

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

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