Speaker
Description
The evolution of nucleon orbitals and arising nuclear properties moving away from the well-established magic numbers are important questions in nuclear structure. Doubly-magic nuclei beyond the classic shell model have been demonstrated at N=32 and N=34 in calcium (Z=20), however evidence for the persistence of these magic neutron numbers beyond calcium remains somewhat elusive. We are interested in probing the development of the neutron orbitals in this vicinity of the nuclide chart to understand how these magic numbers arise and whether they exist in the neighbouring isotones.
The RIBF142 experiment at Riken was a part of the HiCARI campaign, with a fragment beam centred on $^{56,58}$Ti in the BigRIPS and ZeroDegree spectrometers. The combination of the HiCARI gamma array with the BigRIPS and ZeroDegree beamline ion detectors facilitates a suite of techniques to probe many aspects of the structure of neutron-rich Titanium isotopes (Z=22). We employ standard gamma-ray spectroscopy, as well as Doppler-shift lifetime measurements supported by a Geant4 simulation. We also measure parallel momentum distributions following neutron knockout to directly probe the occupation of neutron orbitals around N=32,34.