Two-body photodisintegration of 3He between 200 and 800 MeV

On the Structure of A=3 Nuclei

“…DAPHNE Collaboration have measured the differential cross sections for the 3 He (γ, pd) reaction. The results confirm the rapid decrease of forward-angle cross sections with increasing photon energy, whilst at backward angles, aided by the high precision of the measurement, which show the clear enhancement in the angular distribution and is a possible signature of three-body mechanis ms [17]. Also a schematic three-body forces in addition to a general t wo-body forces leads to a strongly improved description of the energies of light and mediu m mass nuclei [18], and there are effects of three-body force on the longitudinal response function of 4 He [19].…”

“…The composite nature of the nucleons, indicates that many-nucleon forces, and at the least the three-nucleon forces are necessary to explain many bound state properties. A lot of effort has been devoted to understand the correct nature of nuclear forces and currents and this has resulted in developments of accurate many-body techniques for evaluating them [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Hard Two-Body Photodisintegration ofHe3

“…Full details about the analysis of the CLAS data can be found in [33]. Figure 3 shows the resulting cross sections from CLAS and Hall A compared to previously published data [37] for s >10 GeV 2 . In the range of s = 11.5 -15 GeV 2 , the cross section falls by two orders of magnitude.…”

“…This is the first observation of high-energy cross-section to remove the expected energy dependence. The DAPHNE data is taken from [37]. The RNA [17] calculation is normalized to our highest energy data point from JLab/E03-101.…”

Hard photo-disintegration of proton pairs in ³He nuclei

“…The statistical uncertainties range from 2% to 40% for different energy bins. Figure 5.4 shows the measured cross sections from JLab Halls A and B compared to previously published data [87] for s > 10 GeV 2 . Above s = 11.5 GeV 2 , the consistency of the scaled cross sections with being constant can be seen.…”