Helium-helium clustering states in Be12

Z. H. Yang et al.
Phys. Rev. C 91, 024304 – Published 6 February 2015

Abstract

An inelastic excitation experiment was performed with a Be12 beam at 29 MeV/u on a carbon target. New resonances close to the respective cluster separation thresholds were observed in Be12 for the He4+He8 and He6 + He6 decay channels, confirming the previously proposed molecular rotational bands. Using the model-independent angular correlation analysis, a 0+ spin parity is assigned to the remarkably large peak at 10.3 MeV in the He4 + He8 channel. A distorted wave Born approximation (DWBA) calculation was compared to the experimental differential cross section of this state, resulting in a largely enhanced monopole transition matrix element of 7.0±1.0fm2, in good agreement with the generalized two-center cluster model (GTCM) prediction assuming a preformed α4nα configuration. Together with the previously reported large cluster spectroscopic factor, the strong clustering in Be12 is well demonstrated. The detection focused on the most forward angles, by using a zero-deg telescope, is essential in the present measurement.

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  • Received 15 December 2014

DOI:https://doi.org/10.1103/PhysRevC.91.024304

©2015 American Physical Society

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Vol. 91, Iss. 2 — February 2015

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