Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session DK: Nuclear Theory II
9:00 AM–11:30 AM,
Thursday, October 25, 2018
Hilton
Room: Queen's 4
Chair: Kristina Launey, Louisiana State University
Abstract ID: BAPS.2018.HAW.DK.6
Abstract: DK.00006 : A solution to the puzzle of quenched beta-decays
10:15 AM–10:30 AM
Presenter:
Gaute Hagen
(Oak Ridge National Lab)
Author:
Gaute Hagen
(Oak Ridge National Lab)
A central puzzle has been that observed β-decay rates are systematically smaller than theoretical predictions. This was attributed to an apparent quenching of the fundamental coupling constant gA in the nucleus by a factor of about 0.75. The origin of this quenching is controversial and has so far eluded a first-principles theoretical understanding. This talk presents a solution to this puzzle, and shows that this quenching can be explained from two-body currents and many-body correlations. Using interactions and currents from chiral effective field theory that describe Gamow-Teller strength in light nuclei well, I will present a first principles computation of the Gamow-Teller strength in 100Sn. By developing high order coupled-cluster methods we obtain a quenching factor in the range 0.73-0.85 from two-body currents which depends somewhat on the employed Hamiltonian. Our results are consistent with experimental data, including the pioneering measurement for 100Sn [1,2]. These theoretical advances have been enabled by systematic effective field theories combined with powerful quantum many-body techniques and ever increasing computational power.
[1] Hinke, C. B. et al., Nature 486, 341-345 (2012).
[2] Batist, L. et al. Eur. Phys. J. A 46, 45-53 (2010).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.HAW.DK.6
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