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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

P-wave charmonium decays into baryon and antibaryon pairs in quark pair creation model (2005)

Ping, R. G. ; Zou, B. S. ; Chiang, H. C.

Springer

The European physical journal 23 (2005), S. 129-133

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ISSN: 1434-601X

Schlagwort(e): 13.25.Gv Decays of J/ψ, ϒ, and other quarkonia ; 12.39.Jh Nonrelativistic quark model ; 14.20.Jn Hyperons

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract. A simple quark pair creation model is introduced to study exclusive decays of χ{c_J} into baryon-antibaryon pairs. With this simple model, some exclusive decay processes, for example, χ{c0} → B¯ (B = Λ,Σ0,Ξ-) are investigated and their decay widths are evaluated by inclusion of the properties of outgoing baryons, and the results show that the strengthened decay channels χ{c_J} → Λ¯(J = 0, 2) are easily understood by considering only the color singlet contribution of P-wave charmonium.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1140/epja/i2004-10069-9

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The neutron decay retardation spectrometer aSPECT: Electromagnetic design and systematic effects (2005)

Glück, F. ; Baeßler, S. ; Byrne, J. ; [weitere]

Springer

The European physical journal 23 (2005), S. 135-146

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ISSN: 1434-601X

Schlagwort(e): 23.40.-s Beta decay; double beta decay; electron and muon capture ; 13.30.-a Decays of baryons ; 12.15.Hh Determination of Kobayashi-Maskawa matrix elements

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract. The apparatus described here, aSPECT, will be used for a measurement of the neutrino-electron angular correlation coefficient a in the decay of free neutrons. The idea of the aSPECT spectrometer is to measure the integrated proton energy spectrum very accurately using an energy filter by electrostatic retardation and magnetic adiabatic collimation. The main ideas of the spectrometer are presented, followed by an explanation of the adiabatic transmission function. Details of the superconducting coil and of the electrode system are given, as well as a discussion of the most important systematic effects: magnetic field and electrostatic potential inhomogeneities, deviation from adiabatic motion, scattering in the residual gas, background, Doppler effect, edge effect, and detector efficiency. Using this spectrometer, the parameter a is planned to be measured with an absolute experimental uncertainty of δa ≈ 3 . 10-4, from which the axial vector to vector coupling constant ratio λ can be determined with an accuracy of δλ ≈ 0.001.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1140/epja/i2004-10057-1

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