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Two- and Three-Body Photodisintegration of 4He (Benmouna, Berman) Many channels in the 3He data are under analysis as discussed previously. The 4He data also provides a wealth of channels that can be analyzed, as can be seen from Fig. 8, which shows the mass spectra from photoreactions on 4He for both positively and negatively charged particles.
Figure 8. Charged-particle spectra from our data on the photodisintegration of 4He. We have begun to analyze the two-body breakup of 4He through the channel g+4He ® p+t. (Analysis of the charge-symmetric n+3He channel will be much more challenging, since the CLAS has only limited coverage for neutral-particle detection and the 3He particles lose much, if not all, of their kinetic energy in the liquid-helium target.) This analysis constitutes the research project of one of our current summer students. We also plan on analyzing the two-body breakup channel g+4He ® d+d, which is forbidden by isospin conservation from proceeding through dipole channels, and the three-body breakup channel g+4He ® d+p+n. Since two charged particles are detected, the analysis of these channels, like the g3He ® pd reaction (Section 2 above) should be straightforward and should clearly provide us with interesting results. |
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