(Feldman, Berman)

The Trento group has recently published a new six-body calculation including complete treatment of final-state interactions for the total photoabsorption cross section of ⁶Li [Bac02, Bac03]. These results have been compared with the sum of semi-inclusive neutron-emission channels [Ber65] and the two-body ³H+³He breakup channel [Shi75, Jun79]. The former [Ber65] includes the ⁶Li(g,n)⁵Li, ⁶Li(g,pn)⁴He, and ⁶Li(g,p)⁵He® ⁴He+n channels. This comparison of the theory and the data is shown in Fig. 8. The agreement is rather poor; more and better data are required in order to test this theoretical treatment of this few-body system.

We propose to investigate the two-body breakup (³H+³He) of ⁶Li above its threshold (15.7 MeV) by detecting the outgoing tritons in a solid-state detector array. The ³He recoils are unlikely to be detectable due to energy loss inside a solid ⁶Li target. However, previous work [Shi75] indicates that below 40 MeV, the contribution of the three-body channel (³H+p+d) is less than 5%. The other two-body channel (a+d) is almost negligible due to isospin conservation. Thus, by combining new ³H+³He two-body measurements with the previous neutron-emission data of [Ber65], a close approximation to the total photoabsorption cross section can be obtained.

Figure 8. Total photoabsorption cross section for ⁶Li. The curves are calculated by Bacca et al. [Bac02] using the Malfliet-Tjon (MT) and the Minnesota (MN) potentials. The solid squares represent the neutron-emission cross section for ⁶Li(g,xn) alone [Ber65]. The other data points (open circles and filled triangles) represent the sum of the ⁶Li(g,xn) and ⁶Li(g,³H)³He cross sections from [Shi75, Jun79].

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