Bulletin of the American Physical Society
APS April Meeting 2022
Volume 67, Number 6
Saturday–Tuesday, April 9–12, 2022; New York
Session Q11: Mini-Symposium: Neutrino Mass IMini-Symposium Recordings Available
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Sponsoring Units: DNP DAP DPF Chair: Joseph Formaggio, Massachusetts Institute of Technology Room: Majestic |
Monday, April 11, 2022 10:45AM - 11:21AM |
Q11.00001: Cosmological Probes of Neutrino Mass Invited Speaker: Joel Meyers TBD |
Monday, April 11, 2022 11:21AM - 11:33AM |
Q11.00002: Updates from KATRIN on neutrino mass measurements Bjoern Lehnert The Karlsruhe Tritium Neutrino (KATRIN) experiment probes the electron neutrino mass with measurements of the tritium beta decay spectrum. High-precision spectroscopy is performed near the endpoint at 18.6 keV by employing a windowless gaseous tritium source and an electrostatic spectrometer based on the MAC-E filter principle. This approach allows a model-independent measurement of the neutrino mass with a design sensitivity of 0.2 eV (90% CL). The method is complementary to model-dependent measurements in cosmology and neutrinoless double beta decay experiments. |
Monday, April 11, 2022 11:33AM - 11:45AM |
Q11.00003: Final PROSPECT-I analysis: Data Splitting and Single Ended Event Reconstruction implementation and its impact on the oscillation analysis Diego Venegas Vargas
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Monday, April 11, 2022 11:45AM - 11:57AM |
Q11.00004: Atomic relaxation of 7Be after capture decay - absolute energies, transitions and shake probabilities Jorge Machado, Jose Paulo P Santos, Pedro Amaro, Mauro Guerra, Xavier Mougeot, Paul-Antoine Hervieux, Kyle G Leach, Stephan Friedrich The development of high-resolution superconducting tunnel junction (STJ) quantum sensors has recently allowed for direct measurements of 7Li recoils following 7Be electron capture decay through the direct implementation of 7Be+ ions into the sensor. The main goal of the BeEST experiment is the search of physics beyond the standard model (BSM) in the neutrino sector. In the first two Phases of the experiment, details in the spectral response have shown disagreement with available theoretical values in the literature, primarily from the atomic structure. Therefore, an effort on the understanding of the atomic relaxation has to be accomplished. In this work, we present the steps towards the full calculation of the atomic relaxation process after the 7Be decay. Two approaches have been used, one using the Multiconfiguration Dirac Fock and General Matrix Element (MCDFGME) Code and another using the Flexible Atomic Code (FAC). All possible transition energies and relative intensities of all shake processes will be presented. |
Monday, April 11, 2022 11:57AM - 12:09PM |
Q11.00005: Precise mass measurement of 75As for evaluation of ultra-low Q value β-decay branches in 75Se and 75Ge Madhawa V Horana Gamage, Ramesh Bhandari, Georg Bollen, Nadeesha D Gamage, Alec S Hamaker, Daniel Puentes, Matthew Redshaw, Ryan J Ringle, Stefan Schwarz, Chandana S Sumithrarachchi, Isaac T Yandow Ultra-low Q value β decays or electron captures (EC) occur to an excited state in the daughter nucleus with an energy ≲ 1 keV. These decays are of potential interest as candidates for direct neutrino mass determination experiments since a low Q value results in a higher density of counts near the end-point of the β-spectrum where the effect of a non-zero neutrino mass would be observed. A number of potential candidates have been identified. However, the determination of whether these decays are energetically allowed with Q < 1 keV is often limited by uncertainty in the parent and daughter atomic masses. In the case of 75Se and 75Ge, both have potential ultra-low Q value decay branches to distinct final states in 75As. The uncertainty in the Q values is currently limited by the 0.9 keV uncertainty in the mass of the stable daughter 75As. The masses of 75Se and 75Ge on the other hand are known to 73 eV/c2 and 52 eV/c2, respectively. To determine whether these decays are energetically allowed and if they could be ultra-low, we have performed a precise measurement of the mass of 75As via Penning trap mass spectrometry with the LEBIT facility at the NSCL to a precision of ∼100 eV. We will present the results of this measurement and implications for the decays of 75Se and 75Ge. |
Monday, April 11, 2022 12:09PM - 12:21PM |
Q11.00006: A Sterile Neutrino Search with the JSNS2 Experiment Cassandra E Little, Joshua B Spitz The $\text{JSNS}^2$ (J-PARC Sterile Neutrino Search at the J-PARC Spallation Neutron Source) experiment aims to search for $\Delta m^2 \sim 1~\text{eV}^2$ sterile neutrinos at the J-PARC Materials and Life Science Experimental Facility (MLF). $\text{JSNS}^2$ is searching for the $\bar{\nu}_\mu$ to $\bar{\nu}_e$ oscillation via the inverse beta decay (IBD) reaction $\bar{\nu}_e + p \rightarrow e^+ + n$ followed by gammas from neutron capture on Gd. With a 3 GeV proton beam from the Rapid Cycling Synchrotron (RPS) and spallation neutron target, a neutrino source from muon decay at rest (DAR) is created. The $\text{JSNS}^2$ near detector has a fiducial volume of 17 tonnes and is located 24 meters from the neutrino source, and the $\text{JSNS}^2$-II upgrade will feature a far detector with 32 tonnes of fiducial volume 48 meters from the source. This talk will present the status of $\text{JSNS}^2$, which has already accumulated $1.45\times10^{22}$ Proton-On-Target. |
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