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 ED: Mini-Symposium: The Physics of Double Beta Decay - Theory and Supporting Science |
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Chair: Saori Pastore, Washington U. in St. Louis Room: Hyatt Regency Hotel Celestin B |
Friday, October 28, 2022 10:30AM - 11:06AM |
ED.00001: Towards Precise and Accurate Calculations of Neutrinoless Double-Beta Decay Invited Speaker: Jonathan H Engel I present the contents of a report (arXiv:2207.01085) emerging from a National Science Foundation Project Scoping |
Friday, October 28, 2022 11:06AM - 11:18AM |
ED.00002: Statistical predictions for the neutrinoless double-beta decay nuclear matrix element of 136Xe Mihai Horoi Neutrinoless double beta decay (0νββ) nuclear matrix elements (NME) are investigated by many theoretical methods, and they are important for analysing and guiding a large number of experimental efforts. In particular, the 136Xe isotope has one of the largest 0νββ half-life limit observed, and it is at the forefront of the next generation of experimental investigations. However, there are still large discrepancies between the 136Xe 0νββ NME values provided by different theoretical methods. In this contribution we propose a statistical analysis of the 136Xe 0νββ NME for the light Majorana neutrino exchange mechanism (a.k.a. the mass mechanism) using the interacting shell model, and emphasizing the range of the NME probable values and its correlations with observables that can be obtained from the existing nuclear data. Based on a statistical analysis with three independent effective Hamiltonians, we propose a Bayesian Model Averaging approach for providing a common probability distribution function for the 136Xe 0νββ NME. Using this distribution function we report predictions for an optimal value of the 136Xe 0νββ NME, its variance, and its more probable range. |
Friday, October 28, 2022 11:18AM - 11:30AM |
ED.00003: On Systematics of Double-Beta Decay Half Lives Boris Pritychenko Recommended 2$\beta(2\nu)$ half-lives and their systematics are examined in the framework of a semi-empirical approach. Impacts of nuclear deformation, transition energy, shape coexistence, and forbidden transitions on half-live values were observed. These findings were used to predict T$_{1/2}$ for 36 isotopes of interest. Current results are compared with available data. |
Friday, October 28, 2022 11:30AM - 11:42AM |
ED.00004: Determining gA/gV with High Resolution Spectral Measurements Using an LiInSe2 Bolometer Alexander F Leder Neutrinoless Double-Beta decay (0νββ) processes sample a wide range of intermediate forbidden nuclear transitions, which may be impacted by quenching of the axial vector coupling constant (gA/gV), the uncertainty of which plays a pivotal role in determining the sensitivity reach of 0νββ experiments. We performed a series of measurements on a high-resolution LiInSe2 bolometer in a ‘’source=detector'' configuration to measure the spectral shape of the 4-fold forbidden β-decay of 115In. We then determine the value of gA/gV by comparing the spectral shape of theoretical predictions to the experimental β spectrum taking into account various simulated background components as well as a variety of detector effects. In this talk, we will present our measured values for the quenching of gA/gV calculated using a variety of nuclear matrix element calculation techniques as well as a world-leading value for the half-life of 115In. This work demonstrates the power of the bolometeric technique to perform precision nuclear physics single-β decay measurements, which can help reduce the uncertainties in the calculation of nuclear matrix elements present in all 0νββ experiments. |
Friday, October 28, 2022 11:42AM - 11:54AM |
ED.00005: Camera Readout and Barium Tagging (CRAB) for Neutrinoless Double Beta Decay Corey Adams The current landscape of neutrinoless double beta decay features high precision experiments that, when constructed, will be capable of probing the inverted ordering phase space of neutrinoless double beta decay. In this talk, I will present new technological developments in the NEXT collaboration that will enable high pressure Xenon TPC technologies to become essentially background free at the largest scales, opening the door to beyond-ton-scale experiments that could probe the normal ordering. I will present the current R&D to enable this, including Optical readout of TPCs, next-generation light collection technology, and incorporation of barium tagging technology into a neutrinoless double beta decay detector. |
Friday, October 28, 2022 11:54AM - 12:06PM |
ED.00006: Barium Tagging for the NEXT Neutrinoless Double Beta Decay Program Benjamin J Jones The NEXT collaboration is pursuing a phased program to search for neutrinoless double beta decay (0nubb) using high pressure xenon gas time projection chambers. The power of electroluminescent xenon gas TPCs for 0nubb derives from their excellent energy resolution (<1%FWHM), and the topological classification of two electron events, unique among scalable 0nubb technologies. Xenon gas detectors also also offer a further opportunity: the plausible implementation of single barium daughter ion tagging, an approach that may reduce radiogenic and cosmogenic backgrounds by orders of magnitude and unlock sensitivities that extend beyond the inverted neutrino mass ordering. In this talk I will present recent advances in the development of single ion barium tagging for high pressure xenon gas detectors. Topics to be covered will include advances in single ion microscopy in high pressure gas, molecular sensor development including color-shifting and turn-on barium chemosensors, methods for concentrating ions to sensors and/or actuating sensors to ions, and plans for demonstrator phases that aim to prove barium tagging in-situ, on a 3-5 year times |
Friday, October 28, 2022 12:06PM - 12:18PM |
ED.00007: R&D Efforts at UMass to Progress the Understanding of Charge and Light Calibration for nEXO. Jason Bane, Krishna S Kumar, Devin Cesmecioglu, Alexandria Nolan, Thomas Tsang, Triveni Rao, Luca Cultrera The 5-ton liquid xenon TPC of the nEXO experiment will search for the elusive neutrinoless double beta decay of 136Xe with a half-life sensitivity goal of >1028 years. This presentation will describe the status of the R&D at UMass Amherst on novel calibration strategies for ionization charge clusters and photon detection calibration to help reach that sensitivity goal. We explore photo-electricity of gold to produce ionization clusters, and measure their properties as they drift through liquid xenon. We use a dual grid ionization chamber as one way to measure the properties of these electron clusters, also discussed in this presentation. |
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