dorsal/arxiv
View SchemaAtomic Parity Non-Conservation, Neutron Radii, and Effective Field Theories of Nuclei
| Authors | Tapas Sil, M. Centelles, X. Vinas, J. Piekarewicz |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0501014 |
| URL | https://arxiv.org/abs/nucl-th/0501014 |
| DOI | 10.1103/PhysRevC.71.045502 |
| Journal | Phys.Rev.C71:045502,2005 |
Abstract
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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"abstract": "Accurately calibrated effective field theories are used to compute atomic\nparity non-conserving (APNC) observables. Although accurately calibrated, these\neffective field theories predict a large spread in the neutron skin of heavy\nnuclei. While the neutron skin is strongly correlated to a large number of\nphysical observables, in this contribution we focus on its impact on new\nphysics through APNC observables. The addition of an isoscalar-isovector\ncoupling constant to the effective Lagrangian generates a wide range of values\nfor the neutron skin of heavy nuclei without compromising the success of the\nmodel in reproducing well constrained nuclear observables. Earlier studies have\nsuggested that the use of isotopic ratios of APNC observables may eliminate\ntheir sensitivity to atomic structure. This leaves nuclear structure\nuncertainties as the main impediment for identifying physics beyond the\nstandard model. We establish that uncertainties in the neutron skin of heavy\nnuclei are at present too large to measure isotopic ratios to better than the\n0.1% accuracy required to test the standard model. However, we argue that such\nuncertainties will be significantly reduced by the upcoming measurement of the\nneutron radius in 208Pb at the Jefferson Laboratory.",
"arxiv_id": "nucl-th/0501014",
"authors": [
"Tapas Sil",
"M. Centelles",
"X. Vinas",
"J. Piekarewicz"
],
"categories": [
"nucl-th",
"physics.atom-ph"
],
"doi": "10.1103/PhysRevC.71.045502",
"journal_ref": "Phys.Rev.C71:045502,2005",
"title": "Atomic Parity Non-Conservation, Neutron Radii, and Effective Field Theories of Nuclei",
"url": "https://arxiv.org/abs/nucl-th/0501014"
},
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