Weak charge form factor and radius of 208Pb through parity violation in electron scattering

Details Weak charge form factor and radius of 208Pb through parity violation in electron scattering Weak charge form factor and radius of 208Pb through parity violation in electron scattering

2012-02-07

arxiv.org/abs/1202.1468v1

Phys. Rev. C 85, 032501(R) (2012)

Physics

Nuclear Physics

Nuclear Experiment

5 pages, 1 figure, submitted to Phys. Rev. C

Scientific paper

10.1103/PhysRevC.85.032501

We use distorted wave electron scattering calculations to extract the weak charge form factor F_W(q), the weak charge radius R_W, and the point neutron radius R_n, of 208Pb from the PREX parity violating asymmetry measurement. The form factor is the Fourier transform of the weak charge density at the average momentum transfer q=0.475 fm$^{-1}$. We find F_W(q) =0.204 \pm 0.028 (exp) \pm 0.001 (model). We use the Helm model to infer the weak radius from F_W(q). We find R_W= 5.826 \pm 0.181 (exp) \pm 0.027 (model) fm. Here the exp error includes PREX statistical and systematic errors, while the model error describes the uncertainty in R_W from uncertainties in the surface thickness \sigma of the weak charge density. The weak radius is larger than the charge radius, implying a "weak charge skin" where the surface region is relatively enriched in weak charges compared to (electromagnetic) charges. We extract the point neutron radius R_n=5.751 \pm 0.175 (exp) \pm 0.026 (model) \pm 0.005 (strange) fm$, from R_W. Here there is only a very small error (strange) from possible strange quark contributions. We find R_n to be slightly smaller than R_W because of the nucleon's size. Finally, we find a neutron skin thickness of R_n-R_p=0.302\pm 0.175 (exp) \pm 0.026 (model) \pm 0.005 (strange) fm, where R_p is the point proton radius.

Affiliated with

Also associated with

No associations

Rating

Weak charge form factor and radius of 208Pb through parity violation in electron scattering does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Weak charge form factor and radius of 208Pb through parity violation in electron scattering, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Weak charge form factor and radius of 208Pb through parity violation in electron scattering will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-579648