Jun 13 – 17, 2022
Berkeley, CA
US/Pacific timezone

Searching for Tensor Currents in the Weak Interaction in the $\beta$-decay of $^{8}$Li and $^{8}$B

Jun 17, 2022, 9:50 AM
Berkeley, CA

Berkeley, CA

Lawrence Berkeley National Laboratory
Oral Oral Presentations NS2022 Plenary


Aaron Gallant (LLNL)


The weak interaction of the Standard Model is well-described by a vector-axial vector, or ‘V-A’, structure, which reproduces both maximal parity violation and left-handed neutrinos in beta- decay. However, there is no first-principles reason that other the interactions, such as scalar (S) or tensor (T), may not be present. To search for possible tensor contributions to the weak interaction we measure the beta-neutrino correlation coefficient a$_{\beta\nu}$ in the Gamow-Teller beta-decays of $^{8}$Li and $^{8}$B. The $A = 8$ decays are ideal to probe a$_{\beta\nu}$ due to the large Q-value and delayed alpha emission from the excited state $^{8}$Be. These measurements are completed with the Beta decay Paul Trap (BPT) at Argonne National Lab. The BPT is surrounded on 4 sides with double-sided silicon strip detectors backed by plastic scintillator detectors, which allow the kinematics of decay products from the trapped mass-8 ions to be over-constrained. We will present results from a high statistics measurement from the decay of $^{8}$Li, the first results from the decay of $^{8}$B, and the first R-Matrix fit of the $^{8}$B $\beta$-decay final state distribution.

We acknowledge NSERC, Canada, App. No. 216974, the U.S. DOE Contract No. DE-AC02- 06CH11357 [ANL] and DE-AC52-07NA27344 [LLNL], NSF grant no. 1144082 and the ANL ATLAS facility.

Primary author

Aaron Gallant (LLNL)


Dr Mary Burkey (LLNL) Dr Nicholas Scielzo (LLNL) Dr Guy Savard (ANL) Dr Jason Clark (ANL) Dr Barbara Alan (LLNL) Dr Maxime Brodeur (University of Notre Dame) Dr Fritz Buchinger (McGill University) Dr Daniel Burdette (ANL) Dr Tsviki Hirsh (Soreq NRC) Dr Kay Kolos (LLNL) Dr Kyle Leach (Colorado School of Mines) Dr Bernhard Maass (ANL) Dr Scott Marley (Louisiana State University) Dr Rodney Orford (LBL) Dr Mueller Peter (ANL) Mr Dwaipayan Ray (University of Manitoba) Dr Ralph Segel (Northwestern University) Dr Kevin Seigl (University of Tennessee) Dr Kumar Sharma (University of Manitoba) Mr Louis Varriano (University of Chicago)

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