Journal Article

PreJuSER-54963

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png New data for total 3He(gamma,p)D and 3He(gamma,pp)n cross sections compared to current theory

Naito, S.FZJ* ; Nagai, Y.FZJ* ; Shima, T.FZJ* ; Makii, H.FZJ* ; Mishima, K.FZJ* ; Tamura, K.FZJ* ; Toyokawa, H.FZJ* ; Ohgaki, H.FZJ* ; Golak, J.FZJ* ; Skibinski, R.FZJ* ; Witala, H.FZJ* ; Glöckle, W.FZJ* ; Nogga, A.FZJ* ; Kamada, H.FZJ*

2006
Inst. Woodbury, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/11108  doi:10.1103/PhysRevC.73.034003

Abstract: 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.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Institut 3 (Theoretische Kernphysik) (IKP-TH)

Research Program(s):

1. Physik der Hadronen und Kerne (P53)

Appears in the scientific report 2006

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