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Your search keyword '"McGeorge JC"' showing total 2 results
Start Over Author "McGeorge JC" Topic nuclear theory
2 results on '"McGeorge JC"'

1. Photoproduction of pi(0)-mesons from nuclei

Author

Krusche, B, Lehr, J, Ahrens, J, Annand, JRM, Beck, R, Bloch, F, Fog, LS, Hornidge, D, Janssen, S, Kotulla, M, McGeorge, JC, MacGregor, IJD, Messchendorp, J, Metag, V., Novotny, R, Owens, RO, Pfeiffer, M, Sanderson, R., Schadmand, S, Watts, DP, and Research unit Nuclear & Hadron Physics

Subjects
COHERENT, PHOTOABSORPTION CROSS-SECTIONS, ETA-MESONS, PHOTON SPECTROMETER, Nuclear Theory, NEAR-THRESHOLD PHOTOPRODUCTION, RESONANCE REGION, High Energy Physics::Experiment, PION-PHOTOPRODUCTION, Nuclear Experiment, PROTON, PI(0) PHOTOPRODUCTION, DEUTERON
Abstract

Photoproduction of neutral pions from nuclei (carbon, calcium, niobium, lead) has been studied for incident-photon energies from 200 MeV to 800 MeV with the TAPS detector using the Glasgow photon tagging spectrometer at the Mainz MAMI accelerator. Data were obtained for the inclusive photoproduction of neutral pions and the, partial channels of quasifree single-pi(0), double-pi(0), and pi(0)pi(+/-) photoproduction. They have been analyzed in terms of the in-medium behavior of nucleon resonances and the pion-nucleus interaction. They are compared to earlier measurements from the deuteron and to the predictions of a Boltzmann-Uehling-Uhlenbeck (BUU) transport model for photon-induced pion production from nuclei.

Published
2004

2. Photoproduction of eta-mesic He-3

Author

Pfeiffer, M, Ahrens, J, Annand, JRM, Beck, R, Caselotti, G, Cherepnya, S, Fohl, K, Fog, LS, Hornidge, D, Janssen, S, Kashevarov, [No Value], Kondratiev, R, Kotulla, M, Krusche, B, McGeorge, JC, MacGregor, IJD, Mengel, K, Messchendorp, JG, Metag, [No Value], Novotny, R, Rost, M, Sack, S, Schadmand, S, Thomas, A, Watts, DP, Sanderson, R., and KVI - Center for Advanced Radiation Technology

Subjects
Nuclear Theory, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, MESONS, DEUTERON, THRESHOLD
Abstract

The photoproduction of eta-mesic He-3 has been investigated using the TAPS calorimeter at the Mainz Microtron accelerator facility MAMI. The total inclusive cross section for the reaction gamma(3)He-->etaX has been measured for photon energies from threshold to 820 MeV. The total and angular differential coherent eta cross sections have been extracted up to energies of 745 MeV. A resonancelike structure just above the eta production threshold with an isotropic angular distribution suggests the existence of a resonant quasibound state. This is supported by studies of a competing decay channel of such a quasibound eta-mesic nucleus into pi(0)pX. A binding energy of (-4.4+/-4.2) MeV and a width of (25.6+/-6.1) MeV is deduced for the quasibound eta-mesic state in He-3.

Published
2004

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