By Joseph Cerny
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Additional resources for Nuclear Spectroscopy and Reactions, Part B
1963)]. The expression for the potential scattering phase is also modified from the hard-sphere phase by a term which depends on jR^°. Since these two terms are of the same order of magnitude, one should not expect to be able to interpret the energy dependence of the potential scattering contribution to the nuclear phase shift in terms of scattering from a hard sphere. Additional complications arise in the extraction of level parameters at energies where there are open reaction channels and the phase shifts are complex quantities.
A) ^cm = 56°, P 2 ^ 0 ; ( b ) (9cm = 72°,i>4:^0. 39 I V . A . l . CROSS-SECTION AND POLARIZATION STUDIES 5L / r /· 275. 8% 'Be. 36 r / / i l - ) iL2_ lêiO. mi. 90 1663 Fig. 12. The energy level diagram for «Be is shown on the left (see Lauritsen and Ajzenberg-Selove, 1966). The even-spin, positive-parity levels which are observed in QL-OL elastic scattering measurements are shown in the expanded level diagram at the right. 6 MeV (Bacher et al, 1972c) has not been included. 40 Α. D. BACHER to the fact that as one approaches the thresholds for the p-^Li, n-'^Be, and d-^Li channels these configurations can be expected to contribute substan tially to the observed level structure.
The historical development and the current status of these investigations has been extensively reviewed by Afzal et al. (1969). The low-energy phase shifts for α-α scattering, shown in Fig. 6, have been interpreted in terms of low-lying 0^, 2"^, and 4"^ levels in ^Be with a pre dominant alpha-particle structure. On the basis of both elastic scattering and reaction data. Barker (1968, 1969) has recently presented evidence for ad ditional broad 0^ and 2'^ resonances in the same region of excitation.