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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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Measurement of the πmeson polarizabilities via the γp → γπ+n reaction (2005)

Ahrens, J. ; Alexeev, V. M. ; Annand, J. R. M. ; [et al.]

Springer

The European physical journal 23 (2005), S. 113-127

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ISSN: 1434-601X

Keywords: 12.38.Qk Experimental tests ; 13.40.-f Electromagnetic processes and properties ; 13.60.Le Meson production

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract. An experiment on the radiative π{+}-meson photoproduction from the proton ( γp → γπ{+}n) was carried out at the Mainz Microtron MAMI in the kinematic region 537MeV 〈 Eγ 〈 817MeV, 140°≤ $ \theta_{{\gamma \gamma ^{\prime }}}^{{{{\rm cm}}}}$ ≤180°. The π{+}-meson polarizabilities have been determined from a comparison of the data with the predictions of two different theoretical models, the first one being based on an effective pole model with pseudoscalar coupling while the second one is based on diagrams describing both resonant and nonresonant contributions. The validity of the models has been verified by comparing the predictions with the present experimental data in the kinematic region where the pion polarizability contribution is negligible ( s1 〈 5mπ2) and where the difference between the predictions of the two models does not exceed 3%. In the region, where the pion polarizability contribution is substantial ( 5 〈 s1/mπ2 〈 15, -12 〈 t/mπ2 〈 - 2), the difference $\ensuremath{(\alpha -\beta )_{\pi^{+}}}$ of the electric (α) and the magnetic (β) polarizabilities has been determined. As a result we find $\ensuremath{(\alpha -\beta )_{\pi^{+}}=(11.6\pm 1.5_{{\rm stat}}\pm 3.0_{{\rm syst}}\pm 0.5_{{\rm mod}})\times 10^{-4}{}{\rm fm^{3}}}$ . This result is at variance with recent calculations in the framework of chiral perturbation theory.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1140/epja/i2004-10056-2

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General survey of polarization observables in deuteron electrodisintegration (2005)

Arenhövel, H. ; Leidemann, W. ; Tomusiak, E. L.

Springer

The European physical journal 23 (2005), S. 147-190

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ISSN: 1434-601X

Keywords: 21.45.+v Few-body systems ; 24.70.+s Polarization phenomena in reactions ; 25.30.Fj Inelastic electron scattering to continuum ; 13.40.-f Electromagnetic processes and properties

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract. Polarization observables in inclusive and exclusive electrodisintegration of the deuteron using a polarized beam and an oriented target are systematically surveyed using the standard nonrelativistic framework of nuclear theory but with leading-order relativistic contributions included. The structure functions and the asymmetries corresponding to the various nucleon polarization components are studied in a variety of kinematic regions with respect to their sensitivity to realistic NN-potential models, to subnuclear degrees of freedom in terms of meson exchange currents, isobar configurations and to relativistic effects in different kinematical regions, serving as a benchmark for a test of present standard nuclear theory with effective degrees of freedom.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1140/epja/i2004-10061-5

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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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