2-7 June 2019
Simon Fraser University
America/Vancouver timezone
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Anti-neutrino Energy Spectrum and Ground State Branching Ratio of Laser Trapped $^{92}Rb \rightarrow$ $^{92}Sr \beta^-\bar{\nu}_e$

Jun 3, 2019, 2:00 PM
HC 114 (Simon Fraser University)

HC 114

Simon Fraser University

Oral Competition (Graduate Student) / Compétition orale (Étudiant(e) du 2e ou 3e cycle) Nuclear Physics / Physique nucléaire (DNP-DPN) M2-2 Fundamental Symmetries (DNP) | Symétries fondamentales (DPN)


Mr James McNeil (UBC)


Reactor neutrino oscillation experiments observe two anomalies in anti-neutrino energy spectra: a total deficit of events, and an event excess in the 5-7 MeV range compared to theory. A total deficit in anti-neutrino flux may support a non-SM sterile neutrino, but both discrepancies may result from inadequate understanding of the reactor fuel cycle. In the 5-7 MeV range first-forbidden $0^-\rightarrow 0^+$ decays account for 30% of the total anti-neutrino ($\bar{\nu}_e$) flux, with $^{92}Rb$ ground-state to ground-state branch (GSB) alone accounting for 30-50% of $0^-\rightarrow 0^+$ $\bar{\nu}_e$ flux. Model predictions will be improved by measuring the $\bar{\nu}_e$ energy spectra from $^{92}Rb$ decay, and measuring the strong GSB ratio with projected 2% accuracy and independent systematics to traditional total absorption spectrometers. Using the TRINAT neutral atom trap, and measured momenta of beta and recoiling $^{92}Sr$ daughter, kinematic reconstruction of $\bar{\nu}_e$ energy spectra, decay Q-value, GSB ratio, and beta-neutrino angular correlation coefficient $a_{\beta\nu}$ are examined experimentally.

Primary authors

Mr James McNeil (UBC) Dr John Behr (TRIUMF) Dr Alexandre Gorelov (TRIUMF) Ms Melissa Anholm (University of Manitoba) Dr Dan Melconian (Texas A&M) Dr Danny Ashery (University of Tel Aviv)

Presentation materials