Speaker
Dr
Jason Holt
(TRIUMF)
Description
Within the context of valence-space Hamiltonians derived from different ab initio
many-body methods, I will discuss the importance of 3N forces in understanding and
making new discoveries in two of the most exciting regions of the nuclear chart:
exotic oxygen and calcium isotopes. Beginning in oxygen, we find that the effects of
3N forces are decisive in explaining why 24O is the last bound oxygen isotope [1,2].
Furthermore, 3N forces play a key role in reproducing spectra, including signatures
of doubly magic 22,24O, as well as properties of isotopes beyond the dripline. The
calcium isotopes, with potentially three new magic numbers beyond the standard
N=20,28, present a unique laboratory to study the evolution of shell structure in
medium-mass nuclei. From the viewpoint of two-neutron separation energies and
spectroscopic signatures of doubly-magic systems, I emphasize the impact of 3N forces
in reproducing the N=28 magic number in 48Ca and in predicting properties of 50-56Ca,
which indicate new N=32,34 magic numbers. Finally, I will highlight new efforts to
quantify theoretical uncertainties in ab initio calculations of medium-mass nuclei by
exploring resolution-scale dependence of observables in sd-shell isotopic/isotonic
chains.
Primary author
Dr
Jason Holt
(TRIUMF)
