How low-energy weak reactions can constrain three-nucleon forces and the neutron-neutron scattering length

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dc.creatorGardestig, A.
dc.creatorPhillips, D. R.
dc.date2006-03-15
dc.date2006-06-07
dc.date.accessioned2026-07-07T10:30:46Z
dc.date.available2026-07-07T10:30:46Z
dc.descriptionWe show that chiral symmetry and gauge invariance enforce relations between the short-distance physics that occurs in a number of electroweak and pionic reactions on light nuclei. Within chiral perturbation theory this is manifested via the appearance of the same axial isovector two-body contact term in pi- d -> n n gamma, p-wave pion production in NN collisions, tritium beta decay, pp fusion, nu d scattering, and the hep reaction. Using a Gamow-Teller matrix element obtained from calculations of pp fusion as input we compute the neutron spectrum obtained in pi- d -> n n gamma. With the short-distance physics in this process controlled from p p -> d e+ nu_e the theoretical uncertainty in the nn scattering length extracted from pi- d -> n n gamma is reduced by a factor larger than three, to <~0.05 fm.
dc.descriptionREVTeX4, 4 pages (5 pages since the arXiv doesn't collapse refs), 3 eps figures; revised version to appear in PRL, conclusions unchanged
dc.identifierhttps://arxiv.org/abs/nucl-th/0603045
dc.identifierhttp://arxiv.org/abs/nucl-th/0603045
dc.identifierPhys.Rev.Lett.96:232301,2006
dc.identifierdoi:10.1103/PhysRevLett.96.232301
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/178234
dc.subjectNuclear Theory
dc.titleHow low-energy weak reactions can constrain three-nucleon forces and the neutron-neutron scattering length
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