Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session MN: Mini-Symposium Intersections of Neutrino Physics and Nuclear Physics II |
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Chair: David Radford, Oak Ridge National Laboratory Room: Hilton Kohala 4 |
Saturday, October 27, 2018 2:00PM - 2:15PM |
MN.00001: Double-beta decay nuclear matrix element using finite-amplitude method Nobuo Hinohara, Jonathan H Engel The quasiparticle random-phase approximation (QRPA) can be used to evaluate the nuclear matrix element of the double-beta decay but the standard approach based on the matrix diagonalization is computationally demanding. We propose double contour integration technique of the finite-amplitude method, which is the linear response formalism of the QRPA for nuclear density functional theory, to compute the QRPA nuclear matrix elements efficiently. We will show numerical applications to double Gamow-Teller transition strengths and 2$\nu$ matrix elements. |
Saturday, October 27, 2018 2:15PM - 2:30PM |
MN.00002: Double Gamow Teller transition and its relation to neutrinoless double beta decay matrix element Noritaka Shimizu, Javier Menendez, Kentaro Yako
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Saturday, October 27, 2018 2:30PM - 2:45PM |
MN.00003: A percent-level determination of the nucleon axial coupling from quantum chromodynamics Chia Cheng Chang, Amy N Nicholson, Enrico Rinaldi, Evan Berkowitz, Nicolas Garron, David Brantley, Henry Monge-Camacho, Christopher Monahan, Christopher M Bouchard, M. A. Clark, Balint Joo, Thorsten Kurth, Kostas Orginos, Pavlos Vranas, Andre P Walker-Loud The axial coupling of the nucleon, gA, is the strength of its coupling to the weak axial current. Precision tests of the Standard Model in nuclear environments require a quantitative understanding of nuclear physics rooted in Quantum Chromodynamics. The prominence of gA makes it a benchmark quantity to determine theoretically -- a difficult task because quantum chromodynamics is non-perturbative, precluding known analytical methods. Lattice Quantum Chromodynamics provides a rigorous, non-perturbative definition of quantum chromodynamics that can be implemented numerically. It has been estimated that a precision of two percent would be possible by 2020 if two challenges are overcome: contamination of gA from excited states must be controlled in the calculations and statistical precision must be improved markedly. Here we report a calculation of gAQCD = 1.271±0.013, using an unconventional method inspired by the Feynman--Hellmann theorem that overcomes these challenges. |
Saturday, October 27, 2018 2:45PM - 3:00PM |
MN.00004: Measurement of Quenched Axial Vector Coupling Constant in In-115 Beta Decay and its Impact on Future 0$\nu\beta\beta$ Searches Alexander Friedrich Leder, Claudia Nones, Anastasiia Zolotarova, Fedor Danevich, Andrea Giuliani, Pierre de Marcillac, Valentina Novati, Emiliano Olivieri, Denys Poda, Vladimir Tretyak, Joel Kostensalo, Jouni Suhonen, Jonathan Ouellet, Lindley A Winslow 0$\nu\beta\beta$ is a nuclear process under investigation by numerous experiments, which if detected would demonstrate that neutrinos are Majorana particles. 0$\nu\beta\beta$ samples a wide range of intermediate forbidden nuclear transitions, which are governed by the quenched axial vector coupling constant ($g_A^{eff}$), the uncertainty of which plays a pivotal role in the uncertainty of the nuclear matrix elements. The recently reexamined role of $g_A^{eff}$ in these transitions has prompted measurements of $g_A^{eff}$ in highly forbidden decays via beta spectrum shape investigation with high resolution, low threshold bolometers. In this talk, we present measurements performed on a $LiInSe_{2}$ bolometer, with a 4-fold forbidden beta decay of In-115. This decay is sensitive to similar nuclear effects as 0$\nu\beta\beta$. We extracted the value of $g_A^{eff}$ through the use of a Markov Chain Monte Carlo taking into account experimentally determined background levels. We will discuss the obtained results along with possible impacts this study has for future 0$\nu\beta\beta$ measurements. |
Saturday, October 27, 2018 3:00PM - 3:15PM |
MN.00005: KamLAND-Zen Azusa Gando Neutrinoless double beta (0nbb) decay requires Majorana nature of the neutrino and lepton number violation. Assuming the minimal mechanism of the decay, it would constrain the neutrino mass hierarchy and mass scale via phase space factor and nuclear matrix element. KamLAND-Zen searches for neutrinoless double beta decay with Xe-136 loaded liquid scintillator. Results from “KamLAND-Zen 400” are based upon data collected from 2011 to 2015 and we obtained the most stringent lower limit for 0nbb decay half-life of Xe-136, 1.07*10^26 yrs at 90% C.L. Next phase, “KamLAND-Zen 800” is in preparation and will start data taking in this year. In this talk, the current status of KamLAND-Zen will be reported. |
Saturday, October 27, 2018 3:15PM - 3:30PM |
MN.00006: CANDLES Collaboration Progress Update and Future Prospects Temuge Batpurev CANDLES experiment is looking for the neutrinoless double beta decay(0νββ) of 48Ca using 96 pure CaF2 crystals. The 0νββ decay is a lepton number violating process, which is possible if the neutrino is a Majorana nature particle. If the 0νββ decay is observed, it confirms the Majorana nature of the neutrino as well as provide information about the absolute mass scale of the neutrino. 48Ca was chosen for CANDLES because it has the highest Q value among candidate isotopes at 4.27MeV. However, 48Ca has a low natural abundance and therefore an extremely low background detector is required to The CANDLES detector is currently operating at Kamioka underground observatory at 2700 meter water equivalent depth. In 2016, we upgraded the detector with lead and boron shielding, installed new DAQ system and installed magnetic cancellation coils. The physics run after the upgrades were taken in a cooled environment. In this presentation, we report on the status of CANDLES experiment after the upgrades, the performance of the upgrades as well as future prospects for CANDLES experiment. For future analysis prospects, we present GPU accelerated machine learning approaches for waveform classification and background reduction. |
Saturday, October 27, 2018 3:30PM - 3:45PM |
MN.00007: CUORE Measurement of Two-Neutrino Double-Beta Decay Christopher Davis The Cryogenic Underground Observatory for Rare Events (CUORE) is a neutrinoless double-beta decay experiment currently operating at the Laboratori Nazionali del Gran Sasso (LNGS). Since April 2017, CUORE has been taking data in 130Te by using 988 TeO2 crystals arranged in 19 towers inside of a cryostat operating at approximately 10 mK. In this talk, I will present the measurement of the two-neutrino double-beta decay rate and the search for other rare events. With 86.3 kg*y of 130Te data, we determine the half-life of two-neutrino double-beta decay to be 7.9 ± 0.1 (stat) ± 0.2 (syst) × 1020 y. |
(Author Not Attending)
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MN.00008: Cherenkov and scintillation light separation in water-based liquid scintillator with the CHESS experiment Gabriel Orebi Gann, Javier Caravaca, Benjamin J Land Separate identification of scintillation and Cherenkov light produced in a scintillating medium enables outstanding capabilities for future particle detectors. Water-based liquid scintillator (WbLS), a suspension of liquid scintillator in water, may provide affordable scaling to large-scale, directional, low-threshold detectors. Such a hybrid scintillation/Cherenkov detector would be sensitive to a broad range of physics, from long-baseline neutrino oscillation to low-energy and rare-event searches. The CHESS experiment exploits the fact that Cherenkov light is emitted pico-seconds after the excitation, with a characteristic cone-like topology, while scintillation light is emitted isotropically, typically at nano-second time scales. With an array of small, fast photo-multipliers (PMTs) and state-of-the-art electronics, the CHESS detector achieves sub-nanosecond time resolution. The Cherenkov and scintillation components of light emitted by WbLS are measured by characterizing the photon emission time profile. Here we present for the first time the time profile characterization and Cherenkov/scintillation separation results for a range of WbLS loadings. |
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