Wed·Jun 26, 2019Wednesday·June 26, 2019

1. 01*

   Status of the KATRIN neutrino mass experiment

   Yung-Ruey Yen🇺🇸

   The KArlsruhe TRItium Neutrino (KATRIN) experiment is designed to measure tritium $\beta$-decay spectrum with enough precision to be sensitive to neutrino mass down to 0.2eV at 90$\%$ Confidence Level. After an initial first tritium run in the summer of 2018, KATRIN is taking tritium data in 2019 that should lead to a first neutrino mass result. The $\beta$ spectral shape of the tritium decay is also sensitive to four countershaded Lorentz Violating (LV), oscillation-free operators within the Standard-Model Extension that may be quite large. The status and outlook of KATRIN to produce physics results, including in the LV sector, are discussed.

   nucl-exphysics.ins-det2 citations
2. 02*

   The $0\nu 2\beta$-decay CROSS experiment: preliminary results and prospects

   I.C. Bandac🇪🇸 · A.S. Barabash🇷🇺 · L. Bergé🇫🇷 · M. Brière🇫🇷 · Ch. Bourgeois🇫🇷 · P. Carniti🇮🇹 · M. Chapellier🇫🇷 · M. de Combarieu🇫🇷 · I. Dafinei🇮🇹 · F.A. Danevich🇺🇦 · N. Dosme🇫🇷 · D. Doullet🇫🇷 and 25 other authors

   Neutrinoless double-beta decay is a key process in particle physics. Its experimental investigation is the only viable method that can establish the Majorana nature of neutrinos, providing at the same time a sensitive inclusive test of lepton number violation. CROSS (Cryogenic Rare-event Observatory with Surface Sensitivity) aims at developing and testing a new bolometric technology to be applied to future large-scale experiments searching for neutrinoless double-beta decay of the promising nuclei ${}^{100}$Mo and ${}^{130}$Te. The limiting factor in large-scale bolometric searches for this rare process is the background induced by surface radioactive contamination, as shown by the results of the CUORE experiment. The basic concept of CROSS consists of rejecting this challenging background component by pulse-shape discrimination, assisted by a proper coating of the faces of the crystal containing the isotope of interest and serving as energy absorber of the bolometric detector. In this paper, we demonstrate that ultra-pure superconductive Al films deposited on the crystal surfaces act successfully as pulse-shape modifiers, both with fast and slow phonon sensors. Rejection factors higher than 99.9% of $\alpha$ surface radioactivity have been demonstrated in a series of prototypes based on crystals of Li${}_2$MoO${}_4$ and TeO${}_2$. We have also shown that point-like energy depositions can be identified up to a distance of $\sim 1$ mm from the coated surface. The present program envisions an intermediate experiment to be installed underground in the Canfranc laboratory (Spain) in a CROSS-dedicated facility. This experiment, comprising $\sim 3\times 10^{25}$ nuclei of ${}^{100}$Mo, will be a general test of the CROSS technology as well as a worldwide competitive search for neutrinoless double-beta decay, with sensitivity to the effective Majorana mass down to 70 meV in the most favorable conditions.

   nucl-exphysics.ins-detJHEP(2020)·42 citations
3. 03*

   Dynamical coupled-channels approach to electroweak meson productions on nucleon and deuteron

   Satoshi X. Nakamura (University of Science and Technology of China)🇨🇳

   I overview our recent activity with the Argonne-Osaka dynamical coupled-channels (DCC) approach that provides a unified description of various electroweak meson productions on single nucleon and nucleus. First I discuss the DCC model of a single nucleon. The DCC model has been developed through a comprehensive analysis of $\pi N,\gamma N\to \pi N,\eta N,K\Lambda ,K\Sigma$ reaction data. The model has been further extended to finite $Q^2$ region by analyzing pion electroproduction data, and to neutrino-induced reactions using the PCAC relation. Next I discuss applications of the DCC model to electroweak meson productions on the deuteron. We consider impulse mechanism supplemented by final state interactions (FSI) due to $NN$ and meson-nucleon rescatterings. Using this model, I discuss FSI corrections needed to extract $\gamma$-neutron reaction observables from $\gamma d\to \pi NN$, and a novel method to extract $\eta N$ scattering length from $\gamma d\to \eta pn$. I also discuss FSI corrections on the existing neutrino-nucleon pion production data that had been extracted from neutrino-deuteron data.

   ↳ nucl-thhep-exhep-phnucl-exAIP Conf.Proc.(2020)·0 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.