Speaker
Description
Inferences of nuclear symmetry energy parameters from recent parity-violating neutron skin measurements of the neutron-rich nuclei Ca-48 and Pb-208 appear to be in tension not only with each other but also with values obtained from fitting either nuclear masses or neutron matter theory. By themselves, PREX I+II measurements of Pb-208 and CREX measurement of Ca-48 suggest $L\simeq110\pm36$ MeV and $L\simeq23\pm27$ MeV, respectively, to 68\% confidence. However, jointly satisfying both at 90\% confidence implies $L\simeq51\pm11$ MeV, nearly exactly the range suggested by either nuclear mass fitting or neutron matter theory. This small inferred parameter range is also consistent with nuclear dipole polarizability measurements as well as X-ray and gravitational wave observations of neutron stars.
| Topic | Nuclear Structure and Nuclear Astrophysics |
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