title: Heavy cluster knockout reaction (16)O((12)C,2(12)C)(4)He and the nature of the (12)C-(12)C interaction potential.
abstract: The heavy cluster knockout reaction (16)O((12)C,2(12)C)(4)He performed for the first time, reveals the true nature of the (12)C-(12)C interaction. The observed cross section is enhanced by almost 2 orders of magnitude over the conventional zero range distorted wave impulse approximation (DWIA) predictions. An attractive (12)C-(12)C optical potential, as obtained in the folding model, does not explain the enhanced cross section in the finite range (FR) DWIA framework. The inclusion of a hard core of fairly long range ∼3.65  fm explains the data. The present investigation of (16)O((12)C,2(12)C)(4)He along with the (12)C-(12)C elastic scattering also proves beyond doubt that the folding model's deep attractive heavy ion potentials are unsuitable to describe the highly overlapping heavy ions. The application of FR-DWIA opens up new avenues to use the heavy core knockout for the detailed investigation of heavy as well as Borromean halo nuclei.
authors.affiliation: Nuclear Physics Division, Bhabha Atomic Research Center, Mumbai-400 085, India. bnjoshi@barc.gov.in
authors.forename: B N
authors.initials: BN
authors.lastname: Joshi
authors.forename: Arun K
authors.initials: AK
authors.lastname: Jain
authors.forename: Y K
authors.initials: YK
authors.lastname: Gupta
authors.forename: D C
authors.initials: DC
authors.lastname: Biswas
authors.forename: A
authors.initials: A
authors.lastname: Saxena
authors.forename: B V
authors.initials: BV
authors.lastname: John
authors.forename: L S
authors.initials: LS
authors.lastname: Danu
authors.forename: R P
authors.initials: RP
authors.lastname: Vind
authors.forename: R K
authors.initials: RK
authors.lastname: Choudhury