Sub-Coulomb breakup of 6Li (→α+d) off 209Bi target

Abstract

Cross section for dissociation of ⁶Li into α+d in the field of ²⁰⁹Bi target nucleus has been measured at an energy about 20% below the Coulomb barrier by detecting α and d in coincidence using a segmented Si-Strip detector array. Measured distribution of relative energy ‘$E_{\alpha d}$’ suggests that the dissociation of the projectile at present beam energy proceeds dominantly through direct breakup and by a small fraction through sequential breakup via 3⁺ resonance state. The Q-value distribution shows that the events are accompanied by the residual target nuclei remaining at the ground state. Measured angular distributions of direct breakup cross-section are analyzed within the framework of Continuum Discretized Coupled Channel (CDCC) calculations. Asymptotic Normalization Coefficient (ANC) describing the amplitude of the tail of the bound state wave function in α+dis obtained from the variation of spectroscopic amplitude with the Single particle asymptotic normalization coefficient. The estimated ANC parameter (2.581 ± 0.212 fm^−1/2) is in excellent agreement with the values previously found in the literature.