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Coupled-reaction-channel study of the C 12 (α, Be 8) reaction and the Be 8 + Be 8 optical potential

par Cuong, Do Cong;Descouvemont, Pierre ;Khoa, Dao Tien;Phuc, Nguyen Hoang
Référence Physical Review C, 102, 2, 024622
Publication Publié, 2020-08-01

Article révisé par les pairs

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Résumé :

Background: Given the established 2α structure of Be8, a realistic model of four interacting α clusters must be used to obtain a Be8+Be8 interaction potential. Such a four-body problem poses a challenge for the determination of the Be8+Be8 optical potential (OP) that is still unknown due to the lack of the elastic Be8+Be8 scattering data. Purpose: To probe the complex Be8+Be8 optical potential in the coupled-reaction-channel (CRC) study of the α transfer C12(α,Be8) reaction measured at Eα=65 MeV and to obtain the spectroscopic information on the α+Be8 cluster configuration of C12. Method: The three- and four-body continuum-discretized coupled-channel (CDCC) methods are used to calculate the elastic α+Be8 and Be8+Be8 scattering at the energy around 16 MeV/nucleon, with the breakup effect taken into account explicitly. Based on the elastic cross section predicted by the CDCC calculation, the local equivalent OP's for these systems are deduced for the CRC study of the C12(α,Be8) reaction. Results: Using the CDCC-based OP's and α spectroscopic factors given by the cluster model calculation, a good CRC description of the α transfer data for both the Be8+Be8 and Be8+Be2+∗8 exit channels is obtained without any adjustment of the (complex) potential strength. Conclusion: The α+Be8 and Be8+Be8 interaction potential can be described by the three- and four-body CDCC methods, respectively, starting from a realistic α+α interaction. The α transfer C12(α,Be8) reaction should be further investigated not only to probe of the 4α interaction but also the cluster structure of C12.