The Structure of ³³Si and the magicity of the N=20 gap at Z=14
2020
The structure of
³³Si
was studied by a one-neutron knockout reaction from a
³⁴Si
beam at 98.5 MeV/u incident on a
9
Be
target. The prompt
γ
rays following the de-excitation of
³³Si
were detected using the GRETINA
γ
-ray tracking array while the reaction residues were identified on an event-by-event basis in the focal plane of the S800 spectrometer at the National Superconducting Cyclotron Laboratory. The presently derived spectroscopic factor values,
C
2
S
, for the
3
/
2
+
and
1
/
2
+
states, corresponding to a neutron removal from the
0
d
3
/
2
and
1
s
1
/
2
orbitals, agree with shell model calculations and point to a strong
N
=
20
shell closure. Three states arising from the more bound
0
d
5
/
2
orbital are proposed, one of which is unbound by about 930 keV. The sensitivity of this experiment has also confirmed a weak population of
9
/
2
−
and
11
/
2
−
1
,
2
final states, which originate from a higher-order process. This mechanism may also have populated, to some fraction, the
3
/
2
−
and
7
/
2
−
negative-parity states, which hinders a determination of the
C
2
S
values for knockout from the normally unoccupied
1
p
3
/
2
and
0
f
7
/
2
orbits.
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