Speaker
Ms
Gemma Wilson
(University of Surrey)
Description
For neutron rich nuclei far from stability, it is known that the magic number N=20 disappears. Recent experiments, such as 24Ne(d,p) with TIARA [1] showed the breakdown of the N=20 magic number in favour of the new N=16 magic number. Theoretical work by Otsuka, Utsuno et al[2] has highlighted the importance of sodium isotope structure in quantifying the evolution of single particle energies approaching the N=20 island of inversion.
SHARC is a multi-purpose silicon array for charged particle detection and features high spatial resolution and a large solid angle coverage. It has been used for the first time, coupled with the TIGRESS segmented germanium array at the ISAC-2 facility at TRIUMF. The aim is to study the disappearance of the N=20 shell gap in very neutron rich sodium isotopes, as evidenced by the rise in energy for the n(d3/2) orbital and the relative lowering of the n(f7/2) and n(p3/2) orbitals.
The experiment was conducted with up to 3x10^7 pps of 25Na at 5MeV/u on a CD2 target. An in-beam scintillator detector, the trifoil, mounted behind a stopping foil was included to identify and reject reactions occurring on the carbon in the target. Results will be shown for background rejection achieved using the trifoil and proton angular distributions obtained by gating on gamma ray transitions. The data from the 25Na(d,p)26Na reaction in inverse kinematics will be presented.
[1] WN Catford et al, J Phys G 31 (2005) S1655
[2] Utsuno et al, Phys Rev C70 (2004) 044307
Primary author
Ms
Gemma Wilson
(University of Surrey)
Co-authors
Dr
Adam Garnsworthy
(TRIUMF)
Prof.
Andrew Boston
(Universirty of Liverpool)
Prof.
Brian Fulton
(Univeristy of York)
Prof.
Carl Svensson
(University of Guelph)
Dr
Christian Diget
(University of York)
Dr
Christopher Pearson
(TRIUMF)
Prof.
Frederic Sarazin
(Colorado School of Mines)
Prof.
Gordon Ball
(TRIUMF)
Dr
Greg Hackman
(TRIUMF)
Prof.
Jean-Pierre Martin
(Universite de Montreal)
Prof.
Jeff Blackmon
(Louisiana State University)
Prof.
Nigel Orr
(LPC Caen)
Prof.
Robert Wadsworth
(University of York)
Prof.
Roby Austin
(St Mary's University)
Dr
Scott Williams
(TRIUMF)
Dr
Simon Fox
(University of York)
Prof.
Wilton Catford
(University of Surrey)
