Speaker
Satoru Momiyama
(Department of Physics, University of Tokyo)
Description
An in-beam gamma-ray spectroscopy via one-neutron knockout reaction of 36Mg and one- or two-proton knockout reaction of 34Mg was performed.
Nuclei around 32Mg, so-called "island of inversion", are known to have a large collectivity.
In the more neutron-rich region the deformation persists toward the shell-model magic number N = 28.
The large collectivity in the island of inversion is well explained with two-particle-two-hole neutron configuration across the N = 20 shell gap.
Knockout reactions are sensitive to the nucleon single-particle configuration, and may therefore reveal the microscopic driving force for the large collectivity in this region.
The experiments were performed at RIBF.
36Mg and 34Mg secondary beams were made in BigRIPS with the 48Ca primary beam.
Secondary targets were C for 36Mg secondary beam and Be for 34Mg respectively.
The NaI(Tl) gamma-ray detector array DALI2 was placed around the secondary target.
Knockout residues were separated and identified by the ZeroDegree Spectrometer.
The status of data analysis of these experiments will be presented in this workshop.
Primary author
Satoru Momiyama
(Department of Physics, University of Tokyo)
