Electroweak probes, anchored by upcoming PREX-II and CREX measurements, can tightly constrain neutron skins and low-momentum weak form factors of argon, xenon, and mirror nuclei within one model family.
Parity-Violating Electron Scattering from 4He and the Strange Electric Form Factor of the Nucleon
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abstract
We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from ^4He at an average scattering angle <theta_lab> = 5.7 degrees and a four-momentum transfer Q^2 = 0.091 GeV^2. From these data, for the first time, the strange electric form factor of the nucleon G^s_E can be isolated. The measured asymmetry of A_PV = (6.72 +/- 0.84 (stat) +/- 0.21 (syst) parts per million yields a value of G^s_E = -0.038 +/- 0.042 (stat) +/- 0.010 (syst), consistent with zero.
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Electroweak probes of ground state densities
Electroweak probes, anchored by upcoming PREX-II and CREX measurements, can tightly constrain neutron skins and low-momentum weak form factors of argon, xenon, and mirror nuclei within one model family.