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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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