Atomic Parity Non-Conservation, Neutron Radii, and Effective Field Theories of Nuclei

Details Atomic Parity Non-Conservation, Neutron Radii, and Effective Field Theories of Nuclei Atomic Parity Non-Conservation, Neutron Radii, and Effective Field Theories of Nuclei

2005-01-05

arxiv.org/abs/nucl-th/0501014v2

Phys.Rev.C71:045502,2005

Physics

Nuclear Physics

Nuclear Theory

24 pages, 6 figures, revtex4; one figure added

Scientific paper

10.1103/PhysRevC.71.045502

Accurately calibrated effective field theories are used to compute atomic parity non-conserving (APNC) observables. Although accurately calibrated, these effective field theories predict a large spread in the neutron skin of heavy nuclei. While the neutron skin is strongly correlated to a large number of physical observables, in this contribution we focus on its impact on new physics through APNC observables. The addition of an isoscalar-isovector coupling constant to the effective Lagrangian generates a wide range of values for the neutron skin of heavy nuclei without compromising the success of the model in reproducing well constrained nuclear observables. Earlier studies have suggested that the use of isotopic ratios of APNC observables may eliminate their sensitivity to atomic structure. This leaves nuclear structure uncertainties as the main impediment for identifying physics beyond the standard model. We establish that uncertainties in the neutron skin of heavy nuclei are at present too large to measure isotopic ratios to better than the 0.1% accuracy required to test the standard model. However, we argue that such uncertainties will be significantly reduced by the upcoming measurement of the neutron radius in 208Pb at the Jefferson Laboratory.

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