Speaker
Dr
Kieran Flanagan
(KU-University of Leuven)
Description
The evolution of nuclear structure with neutron excess
in the copper isotope chain is currently under investigation by
the COLLAPS collaboration. This experiment uses high-resolution
laser spectroscopy, which unambiguously measures the nuclear spin
and provides model-independent measurements of nuclear moments. It
is therefore an ideal tool to study the nuclear structure. In the
isotopes 69,71,73Cu, strong evidence of a migration of the
pi f5/2 level with increasing neutron number was observed in
beta-decay studies of 68-74Ni [1,2]. It is predicted that the pi p3/2 ground state
will be replaced by the pi f5/2 level at N=46. Two-neutron
separation energies from ISOLTRAP mass measurements, show a
signature for the onset of deformation in this same region of the
copper chain [3].
This project aims to chart the onset of deformation and to confirm
a pi f5/2 ground-state configuration at N=46. It also aims
to measure the spin/parity of 72Cu, and thus resolve the
inconsistency between recent results from in-source spectroscopy
and beta-decay studies [4,5]. An initial on-line
run was carried out in September 2006. The hyperfine structures of
64,66,67,68g,68m,69,70gCu were resolved and the magnetic
dipole and electric quadrupole moments, nuclear spins and isotope
shifts subsequently extracted. These results and future prospects
for this project in 2007 will be presented and discussed.
[1] S. Franchoo et al., Phys. Rev. C 64, 054308 (2001).
[2] J. Van Roosbroeck et al., Phys. Rev. C 71, 054307 (2005).
[3] C. Guenaut et al., submitted to Phys. Rev. C.
[4] J.-C. Thomas et al., Phys. Rev. C 74, 054309 (2006).
[5] U. Koster, Private Communication, 2005.
Author
Dr
Kieran Flanagan
(KU-University of Leuven)
Co-authors
Dr
Bradley Cheal
(University of Manchester)
Dr
Christopher Geppert
(GSI)
Dr
David Forest
(University of Birmingham)
Mr
Deyan Yordanov
(KU-University of Leuven)
Dr
Garry Tungate
(University of Birmingham)
Prof.
Gerda Neyens
(KU-University of Leuven)
Dr
Jon Billowes
(University of Manchester)
Dr
Klaus Blaum
(University of Mainz)
Dr
Magdalena Kowalska
(University of Mainz)
Dr
Paul Campbell
(University of Manchester)
Prof.
Peter Lievens
(KU-University of Leuven)
Prof.
Rainer Neugart
(University of Mainz)
Dr
Wilfried Nörtershäuser
(University of Mainz)
