Nuclear Theory·nucl-th

Monday·August 7, 2017

8 papers—5 primary·3 cross-listed

06
Observation of Coherent Elastic Neutrino-Nucleus Scattering
D. Akimov🇷🇺 · J.B. Albert🇺🇸 · P. An🇺🇸 · C. Awe🇺🇸 · P.S. Barbeau🇺🇸 · B. Becker🇺🇸 · V. Belov🇷🇺 · A. Brown🇺🇸 · A. Bolozdynya🇷🇺 · B. Cabrera-Palmer🇺🇸 · M. Cervantes🇺🇸 · J.I. Collar🇺🇸 and 69 other authors
The coherent elastic scattering of neutrinos off nuclei has eluded detection for four decades, even though its predicted cross-section is the largest by far of all low-energy neutrino couplings. This mode of interaction provides new opportunities to study neutrino properties, and leads to a miniaturization of detector size, with potential technological applications. We observe this process at a 6.7-sigma confidence level, using a low-background, 14.6-kg CsI[Na] scintillator exposed to the neutrino emissions from the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory. Characteristic signatures in energy and time, predicted by the Standard Model for this process, are observed in high signal-to-background conditions. Improved constraints on non-standard neutrino interactions with quarks are derived from this initial dataset.
↳ nucl-exhep-exhep-phnucl-thScience(2017)·1005 citations
07
The Electron-Ion Collider: Assessing the Energy Dependence of Key Measurements
E.C. Aschenauer🇺🇸 · S. Fazio🇺🇸 · J.H. Lee🇺🇸 · H. Mäntysaari🇺🇸 · B.S. Page🇺🇸 · B. Schenke🇺🇸 · T. Ullrich🇺🇸 · R. Venugopalan🇺🇸 · P. Zurita🇺🇸
We provide an assessment of the energy dependence of key measurements within the scope of the machine parameters for a U.S. based Electron-Ion Collider (EIC) outlined in the EIC White Paper. We first examine the importance of the physics underlying these measurements in the context of the outstanding questions in nuclear science. We then demonstrate, through detailed simulations of the measurements, that the likelihood of transformational scientific insights is greatly enhanced by making the energy range and reach of the EIC as large as practically feasible.
↳ nucl-exhep-exhep-phnucl-thRept.Prog.Phys.(2019)·205 citations
08
Hydrodynamic tails and a fluctuation bound on the bulk viscosity
Mauricio Martinez🇺🇸 · Thomas Schaefer (North Carolina State University)🇺🇸
We study the small frequency behavior of the bulk viscosity spectral function using stochastic fluid dynamics. We obtain a number of model independent results, including the long-time tail of the bulk stress correlation function, and the leading non-analyticity of the spectral function at small frequency. We also establish a lower bound on the bulk viscosity which is weakly dependent on assumptions regarding the range of applicability of fluid dynamics. The bound on the bulk viscosity $ζ$ scales as $ζ_{min} \sim (P - \frac{2}{3} E)^{2} \sum_{i} D_{i}^{- 2}$ , where $D_{i}$ are the diffusion constants for energy and momentum, and $P - \frac{2}{3} E$ , where $P$ is the pressure and $E$ is the energy density, is a measure of scale breaking. Applied to the cold Fermi gas near unitarity, $∣ λ / a_{s} ∣ \geq 1$ where $λ$ is the thermal de Broglie wave length and $a_{s}$ is the $s$ -wave scattering length, this bound implies that the ratio of bulk viscosity to entropy density satisfies $ζ / s \geq 0.1ℏ/ k_{B}$ . Here, $ℏ$ is Planck's constant and $k_{B}$ is Boltzmann's constant.
↳ cond-mat.quant-gasnucl-thPRA(2017)·29 citations

Affiliations

first authorsco-authorsvia INSPIRE

Observation of Coherent Elastic Neutrino-Nucleus Scattering

The Electron-Ion Collider: Assessing the Energy Dependence of Key Measurements

Hydrodynamic tails and a fluctuation bound on the bulk viscosity

Affiliations