Resonant breakup of Be-8 in Sn-112(Li-7, Be-8 -> 2 alpha) reaction

Background: Reactions involving weakly bound projectiles with alpha + x cluster structure are known to produce a large number of alpha particles, where transfer-induced breakup is one of the possible origins. Detailed investigation on each of these channels is desirable to understand the underlying reaction mechanism. Purpose: Our purpose is to measure the + 1p transfer-induced breakup in the Sn-112(Li-7, Be-8 -> 2 alpha) reaction to understand the possible modes of Be-8 breakup and their contribution to inclusive alpha production. Methods: alpha-alpha coincidence measurements have been carried out for the above reaction at E-beam = 30 MeV. Projectile-like fragments were detected using five sets of Si-strip-detector telescopes and five sets of single Si-detector telescopes. Optical model analysis of elastic scattering data, coupled reaction channels (CRC), and continuum discretized coupled channels (CDCC) calculations were performed to understand the measured cross sections. Results: The experimental cross sections for + 1p transfer-induced breakup in (Li-7, Be-8 -> 2 alpha) reaction through different resonance states of Be-8 have been obtained. Relative energy distribution and Monte Carlo simulation confirm the observation of breakup of Be-8 from its 4(+) (11.35-MeV) resonant state for the first time along with its well-known 0(+) (92-keV) and 2+ (3.12-MeV) resonances. Simultaneous description of elastic scattering, transfer, and breakup cross sections have been made using CDCC plus CRC formalism. Conclusions: Production of a particles in + 1p transfer-triggered breakup is found to proceed mainly through three resonance (0(+), 2(+), and 4(+)) states of Be-8.