New data for total 3He(gamma,p)D and 3He(gamma,pp)n cross sections compared to current theory

Medientyp: E-Artikel

Titel: New data for total 3He(gamma,p)D and 3He(gamma,pp)n cross sections compared to current theory

Beteiligte: Naito, S. [VerfasserIn]; Nagai, Y. [VerfasserIn]; Witala, H. [VerfasserIn]; Glöckle, W. [VerfasserIn]; Nogga, A. [VerfasserIn]; Kamada, H. [VerfasserIn]; Shima, T. [VerfasserIn]; Makii, H. [VerfasserIn]; Mishima, K. [VerfasserIn]; Tamura, K. [VerfasserIn]; Toyokawa, H. [VerfasserIn]; Ohgaki, H. [VerfasserIn]; Golak, J. [VerfasserIn]; Skibinski, R. [VerfasserIn]

Erschienen: Inst., 2006

Sprache: Englisch

DOI: https://doi.org/10.1103/PhysRevC.73.034003

ISSN: 0556-2813

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Beschreibung: A simultaneous measurement of the cross sections of the He-3(gamma, p) D and He-3(gamma, pp) n reactions has been performed for the first time using monoenergetic pulsed gamma-rays at < E gamma > = 10.2 and 16.0 MeV. Charged fragments from the reactions were detected with an efficiency of 100% using a 4 pi time projection chamber containing 3He gas as an active target. The incident gamma-ray flux was measured by a gamma-ray detector. Both the track and energy loss signals of charged fragments were obtained in an off-line analysis and used to clearly identify the reaction channel. Thus, the (gamma, p) and (gamma, pp) cross sections have been determined with small uncertainty. A comparison of the new data to current theory based on the AV18+Urbana IX nuclear forces including pi- and p-like meson exchange currents shows a severe discrepancy at 10.2 MeV, while at 16.0 MeV data and theory agree within about 12%. Three-nucleon force effects are small, but in general shift the theory in the correct direction.

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