Spectroscopy of 36Mg: interplay of normal and intruder configurations at the neutron-rich boundary of the "island of inversion".
We report on the first spectroscopy study of the very neutron-rich nucleus (36)(12)Mg24 using the direct two-proton knockout reaction 9Be(38Si,36Mg+gamma)X at 83 MeV/nucleon. The energy of the first excited 2+ state of 36Mg, E(2+(1)=660(6) keV, was measured. The magnitude of the partial cross sections to the ground state and the 2+(1) state is indicative of strong intruder admixtures in the lowest-lying states as suggested by Monte Carlo shell-model calculations.
Gade
A
A
National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
Adrich
P
P
Bazin
D
D
Bowen
M D
MD
Brown
B A
BA
Campbell
C M
CM
Cook
J M
JM
Ettenauer
S
S
Glasmacher
T
T
Kemper
K W
KW
McDaniel
S
S
Obertelli
A
A
Otsuka
T
T
Ratkiewicz
A
A
Siwek
K
K
Terry
J R
JR
Tostevin
J A
JA
Utsuno
Y
Y
Weisshaar
D
D