Jan 23 – 27, 2023
Bormio, Italy
Europe/Berlin timezone

Tight Symmetry Energy Parameter Constraints from Neutron Skin Measurements

Jan 26, 2023, 9:00 AM
Bormio, Italy

Bormio, Italy

Overview Talk Thursday Morning


JAMES LATTIMER (Stony Brook University)


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

Primary author

JAMES LATTIMER (Stony Brook University)

Presentation materials