A new UHV-compatible beta detector combining two CMOS tracking planes with a scintillator-SiPM calorimeter reports 35% efficiency above 500 keV, 5% energy resolution at 1 MeV, and sub-mm vertexing for the QuIPS levitated-nanosphere experiment.
Improved Limit on Tensor Currents in the Weak Interaction from $^8$Li $\beta$ Decay
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The electroweak interaction in the Standard Model (SM) is described by a pure vector-axial-vector structure, though any Lorentz-invariant component could contribute. In this work, we present the most precise measurement of tensor currents in the low-energy regime by examining the $\beta$-$\bar{\nu}$ correlation of trapped $^{8}$Li ions with the Beta-decay Paul Trap. We find $a_{\beta\nu} = -0.3325 \pm 0.0013_{stat} \pm 0.0019_{syst}$ at $1\sigma$ for the case of coupling to right-handed neutrinos $(C_T=-C_T')$, which is consistent with the SM prediction.
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A compact beta particle momentum detector
A new UHV-compatible beta detector combining two CMOS tracking planes with a scintillator-SiPM calorimeter reports 35% efficiency above 500 keV, 5% energy resolution at 1 MeV, and sub-mm vertexing for the QuIPS levitated-nanosphere experiment.