Spectroscopy of 21O through the (d,p) reaction with the TIARA+MUST2+VAMOS+EXOGAM set-up at GANIL

alpha room -  GANIL-11h

The single-particle structure of exotic nuclei seems to evolve with the isospin.
The well-established sequence of magic numbers appears to be modified as we
move away from the line of stability. In particular, the evolution of the d3/2
level is of paramount importance as the raising of this level will cause an enhancement
of the N=16 rather than the N=20 shell gap. One-nucleon transfer
reactions such as (d,p) selectively and directly probe the single-particle nature
of nuclear levels. A campaign of experiments performed in GANIL with
the TIARA+MUST2+VAMOS+EXOGAM set-up aimed to study the singleparticle
structure of exotic nuclei in the N=16 region. We report here on the
preliminary results of the ²⁰O(d,p)²¹O reaction. The main goal of the experiment
was to measure the single-particle strength in ²¹O and to locate the so-far
unobserved 3/2+ state that carries the 0d3/2 strength. Information on energy
and angle of the light ejectiles is obtained from the TIARA+MUST2 Si-arrays.
The gamma rays following the de-excitation were recorded with EXOGAM and
the beam-like particles were identified at the VAMOS focal plane. The set-up
allowed the study of transfer to bound and unbound states with full channel
identification.