Bulletin of the American Physical Society
Fall 2022 Meeting of the APS Division of Nuclear Physics
Volume 67, Number 17
Thursday–Sunday, October 27–30, 2022; Time Zone: Central Daylight Time, USA; New Orleans, Louisiana
Session 1WB: New Directions in Beta Decay I 
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Chair: Alejandro Garcia, University of Washington Room: Hyatt Regency Hotel Celestin A 
Thursday, October 27, 2022 9:00AM  9:36AM 
1WB.00001: Nuclear ab initio calculations of ^{6}He βdecay for beyond the Standard Model studies Invited Speaker: Petr Navratil Precision measurements of βdecay observables offer the possibility to search for deviations from the Standard Model. A possible discovery of such deviations requires accompanying firstprinciples calculations. We will present a computation of the nuclear structure corrections for the βdecay of ^{6}He which is of central interest in several experimental efforts. We employ the impulse approximation together with wave functions calculated using the ab initio nocore shell model with potentials based on chiral effective field theory. We find that nuclear corrections, which we compute within the sensitivity of future experiments, create significant deviation from the naive GamowTeller predictions, making their accurate assessment essential in searches for physics beyond the Standard Model. 
Thursday, October 27, 2022 9:36AM  10:12AM 
1WB.00002: Precision BetaDecay Studies of ^{8}Li and ^{8}B to Constrain Tensor Currents in the Weak Interaction Invited Speaker: Aaron T Gallant The weak interaction of the Standard Model is welldescribed by a vectoraxial vector, or ‘VA’, structure, which reproduces both maximal parity violation and lefthanded neutrinos in betadecay. However, there is no firstprinciples reason that other the interactions, such as scalar (S) or tensor (T), may not be present. The existence of these exotic S and T currents can then be probed through their effect on various βdecay correlations, such as the βν angular correlation coefficient a_{βν} and the Fierz interference term b_{F}. The GamowTeller βdecays of ^{8}Li and ^{8}B are ideal to probes to measure a_{βν} due to their large Qvalues and the delayed alpha emission from the excited state ^{8}Be, allowing for a detailed measurement of the kinematic shift between the two fragments which can be used to determine a_{βν}. These measurements were performed with the Beta decay Paul Trap (BPT) at Argonne National Lab. The BPT is surrounded on 4 sides with doublesided silicon strip detectors backed by plastic scintillator detectors, which allow the kinematics of decay products from the trapped mass8 ions to be overconstrained. In this presentation we will present the recent results from our work in ^{8}Li and first results from the decay of ^{8}B. 
Thursday, October 27, 2022 10:12AM  10:48AM 
1WB.00003: Ab initio calculations of ^{8}Li beta decay recoil form factors Invited Speaker: Grigor H Sargsyan This work discusses ab initio calculations of recoil form factors in ^{8}Li beta decay essential for improving the sensitivity of highprecision experiments that probe the weak interaction theory. We use the symmetryadapted nocore shell model (SANCSM) that utilizes emergent symmetries in nuclei to reduce the dimensionality of the model space, hence making solutions to heavier nuclei and ultralarge model spaces feasible. The largescale calculations lead to precise prediction of recoil form factors by identifying a strong correlation between them and the ^{8}Li ground state quadrupole moment. In addition, our calculations find a 2^{+} state of the alpha + alpha system that is energetically accessible to beta decay but has not been observed in the experimental ^{8}Be energy spectrum, and has an important effect on the recoil corrections and decay for the A = 8 systems.

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