Speaker
Description
Cluster structure of light weakly bound nuclei have been a topic of immense research interest. A number of interesting observations and features related to breakup of projectile/ejectile in the vicinity of target nucleus have been revealed with 6,7Li, 9Be projectiles. However, there are only few exclusive charged particle coincidence studies performed for probing the cluster structure of 10B. It can directly break into its various cluster configurations, viz., 6Li+α, α+α+d, 8Be+d, and 9Be+p with breakup thresholds (Eth) of 4.46, 5.93, 6.03, and 6.59 MeV respectively. There can also be transfer of few nucleon(s) between target and projectile followed by breakup of unbound/weakly bound ejectiles. In our recent work, we measured elastic scattering and various charged particle production angular distributions with 10B projectile on various targets [1,2]. We have also performed charged particle coincidence measurement with 10B+209Bi system at energy close to the Coulomb barrier. The experiment was performed at BARC-TIFR Pelletron-LINAC Facility, Mumbai. Double sided ΔE-E type Silicon strip detector telescope array covering wide angular range was used for the measurement of the outgoing breakup fragments. Breakup of 10B into α+6Li and 1-n pickup transfer followed by breakup of 11B into α+7Li is investigated. The relative angles between the fragments were determined from the measured scattering angles of the detected fragments. The fragments' mass, kinetic energy and relative angle were then used to calculate their relative energy (Erel). Three clear peaks are seen in Erel spectra of α+6Li corresponding to the unbound states of 10B above α+6Li decay threshold of 4.46 MeV. These states are 4.77 MeV, [5.11, 5.16, 5.18 MeV] and [5.92, 6.02, 6.13 MeV], where brackets denotes the group of states that are unresolved here. 1-n pickup followed by breakup of 11B, 209Bi(10B, 11B→α+7Li)209Bi is also observed. Erel spectra of α+7Li shows a peak at 9.22 MeV corresponding to 9.18 and 9.27 MeV states of 11B above the α-decay threshold of 8.66 MeV. The energies of the breakup fragments α-6Li(7Li) are found to be highly correlated as expected. The angular distributions of different resonant states of 10,11B were also extracted. Continuum-discretized coupled-channels (CDCC) and Distorted Wave Born Approximation (DWBA) calculations were performed using the FRESCO code to describe the breakup and the one-neutron pickup, respectively. The experimental results and calculations will be discussed in detail during the conference. References: [1] Prabhat Mishra et al., Phys. Rev. C 111, 054608 (2025) [2] Prabhat Mishra et al., Nucl. Phys. A 1065, 123264 (2026)