Münster 2017 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 49: Structure and Dynamics of Nuclei VIII
HK 49.4: Talk
Thursday, March 30, 2017, 17:45–18:00, F 33
Uncertainties in constraining low-energy constants from 3H β decay⋆ — •Philipp Klos1,2, Arianna Carbone1,2, Kai Hebeler1,2, Javier Menéndez1,2,3, and Achim Schwenk1,2,4 — 1Institut für Kernphysik, Technische Universität Darmstadt — 2ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH — 3Department of Physics, University of Tokyo — 4Max-Planck-Institut für Kernphysik, Heidelberg
We discuss the uncertainties in constraining low-energy constants of chiral effective field theory from 3H β decay. The half-life is very precisely known, so that the Gamow-Teller matrix element has been used to fit the coupling cD of the axial-vector current to a short-range two-nucleon pair. As the same coupling also describes the leading one-pion-exchange three-nucleon force, this in principle provides a very constraining fit. However, the 3H half-life fit has only been performed at a fixed cutoff value. We show that the cutoff dependence due to the regulator in the axial-vector two-body current affects significantly the Gamow-Teller matrix element. We provide a range of cD values that is compatible within cutoff variation with the experimental 3H half-life and estimate the resulting uncertainties for many-body systems by performing calculations of symmetric nuclear matter.
⋆This work was supported by the DFG through Grant SFB 1245, the ERC Grant No. 307986 STRONGINT, and the Alexander von Humboldt Foundation through a Humboldt Research Fellowship for Postdoctoral Researchers.