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Title: Electroweak Measurements of Neutron Densities in CREX and PREX at JLab, USA

Measurement of the parity-violating electron scattering asymmetry is an established technique at Jefferson Lab and provides a new opportunity to measure the weak charge distribution and hence pin down the neutron radius in nuclei in a relatively clean and model-independent way. This is because the Z boson of the weak interaction couples primarily to neutrons. We will describe the PREX and CREX experiments on $${}^{208}$$Pb and $${}^{48}$$Ca respectively; these are both doubly-magic nuclei whose first excited state can be discriminated by the high resolution spectrometers at JLab. The heavier lead nucleus, with a neutron excess, provides an interpretation of the neutron skin thickness in terms of properties of bulk neutron matter. For the lighter $${}^{48}$$Ca nucleus, which is also rich in neutrons, microscopic nuclear theory calculations are feasible and are sensitive to poorly constrained 3-neutron forces.
 [1] ;  [2] ;  [3]
  1. Indiana U.
  2. UMass
  3. JLAB
Publication Date:
OSTI Identifier:
Report Number(s):
JLAB-PHY-13-1809; DOE/OR/23177-2792; arXiv:1307.3572
FG02-88R40415- A018; FG02-87ER40365
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Eur.Phys.J. A; Journal Volume: 50
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States