title: Direct observation of the ... 4+-to-2+ ... [corrected] gamma transition in 8Be.
abstract: Electromagnetic transition rates provide an important test for nuclear structure models. The nucleus 8Be exhibits a pronounced alpha-cluster structure and is a building block for more complex cluster nuclei. Here we report on the first observation of the gamma transition between the 4(+) and 2(+) states of 8Be in the 4He+4He reaction. The measured on-resonance cross section of 165+/-54 nb leads to a B(E2) of25+/-8e(2) fm(4), in good agreement with alpha-cluster models and sophisticated ab initio structure calculations.
authors.affiliation: Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai-400 085, India.
authors.forename: V M
authors.initials: VM
authors.lastname: Datar
authors.forename: Suresh
authors.initials: S
authors.lastname: Kumar
authors.forename: D R
authors.initials: DR
authors.lastname: Chakrabarty
authors.forename: V
authors.initials: V
authors.lastname: Nanal
authors.forename: E T
authors.initials: ET
authors.lastname: Mirgule
authors.forename: A
authors.initials: A
authors.lastname: Mitra
authors.forename: H H
authors.initials: HH
authors.lastname: Oza