Skip to Main content Skip to Navigation
Journal articles

Studies of pear-shaped nuclei using accelerated radioactive beams

Abstract : There is strong circumstantial evidence that certain heavy, unstable atomic nuclei are 'octupole deformed', that is, distorted into a pear shape. This contrasts with the more prevalent rugby-ball shape of nuclei with reflectionsymmetric, quadrupole deformations. The elusive octupole deformed nuclei are of importance for nuclear structure theory, and also in searches for physics beyond the standard model; any measurable electric-dipole moment (a signature of the latter) is expected to be amplified in such nuclei. Here we determine electric octupole transition strengths (a direct measure of octupole correlations) for short-lived isotopes of radon and radium. Coulomb excitation experiments were performed using accelerated beams of heavy, radioactive ions. Our data on 220Rn and 224Ra show clear evidence for stronger octupole deformation in the latter. The results enable discrimination between differing theoretical approaches to octupole correlations, and help to constrain suitable candidates for experimental studies of atomic electric-dipole moments that might reveal extensions to the standard model.
Document type :
Journal articles
Complete list of metadatas

http://hal.in2p3.fr/in2p3-00824119
Contributor : Michel Lion <>
Submitted on : Tuesday, May 21, 2013 - 10:32:57 AM
Last modification on : Friday, November 6, 2020 - 12:22:07 PM

Identifiers

Collections

Citation

L.P. Gaffney, P. A. Butler, M. Scheck, A. B. Hayes, F. Wenander, et al.. Studies of pear-shaped nuclei using accelerated radioactive beams. Nature, Nature Publishing Group, 2013, 497, pp.199-204. ⟨10.1038/nature12073⟩. ⟨in2p3-00824119⟩

Share

Metrics

Record views

391