2-6 December 2013
Cape Town
Africa/Johannesburg timezone
Abstract submission is closed. Registration will close on 22 November.

Investigations of shape conundra using Coulomb-excitation measurements at RIB facilities

2 Dec 2013, 12:30
25m

Speaker

Prof. Nico Orce (University of the Western Cape)

Description

The highly-efficient and segmented TIGRESS gamma-ray spectrometer at TRIUMF has been used to perform a reorientation-effect Coulomb-excitation study of the first 2+ state at 3.368 MeV in 10Be. This is the first Coulomb-excitation measurement that enables one to obtain information on diagonal matrix elements for such a high-lying first excited state from gamma-ray data. With the availability of accurate lifetime data, a value of -0.110(0.087) eb is determined for the diagonal matrix element, which assuming the rotor model, leads to a negative spectroscopic quadrupole moment. This negative value is in agreement with timely no-core shell-model calculations performed with the CD-Bonn 2000 two-nucleon potential and large shell-model spaces, and Green's function Monte Carlo predictions with two- plus three-nucleon potentials. This agreement outlines, however, a clear deficiency in our understanding of the spin-orbit interaction. Further reorientation-effect Coulomb-excitation measurements at iThemba LABS and the new RIB facility at CERN, HIE-ISOLDE, will also be discussed.

Primary author

Prof. Nico Orce (University of the Western Cape)

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