Simultaneous measurement of the photodisintegration ofHe4in the giant dipole resonance region

• DOI: 10.1103/physrevc.72.044004
• Publication Date: 2005-10-26T22:40:22Z
• Authors: T. Shima; S. Naito; Y. Nagai; T. Baba; K. Tamura; T. Takahashi; T. Kii; H. Ohgaki; H. Toyokawa
• Keywords: Photodisintegration; Photon energy

We have performed for the first time simultaneous measurement of two-body and three-body photodisintegration cross sections $^{4}\mathrm{He}$ in energy range from 21.8 to 29.8 MeV using monoenergetic pulsed photons a 4\ensuremath{\pi} projection chamber containing gas as an active target event-by-event mode. The photon beam was produced via Compton backscattering laser with high-energy electrons. $^{4}\mathrm{He}$($\ensuremath{\gamma},p$)$^{3}\mathrm{H}$ $^{4}\mathrm{He}$($\ensuremath{\gamma},n$)$^{3}\mathrm{He}$ were found increase monotonically up MeV, contrast result recent theoretical calculation based on Lorentz integral transform method that predicted pronounced peak at around 26--27 MeV. dependence obtained section 26.5 is marginally consistent Faddeev-type predicting flat pattern excitation function. ratio be expected value charge symmetry strong interaction within experimental uncertainty measured range. present results total are compared previous data calculations.