Mon·Jul 7, 2014Monday·July 7, 2014

1. 01*

   Spectral Structure of Electron Antineutrinos from Nuclear Reactors

   D. A. Dwyer🇺🇸 · T. J. Langford🇺🇸

   Recent measurements of the positron energy spectrum obtained from inverse beta decay interactions of reactor electron antineutrinos show an excess in the 4 to 6 MeV region relative to current predictions. First-principle calculations of fission and beta decay processes within a typical pressurized water reactor core identify prominent fission daughter isotopes as a possible origin for this excess. These calculations also predict percent-level substructure in the antineutrino spectrum due to Coulomb effects in beta decay. Precise measurement of this substructure can constrain nuclear reactor physics. The substructure can be a systematic uncertainty for measurements utilizing the detailed spectral shape.

   nucl-exhep-exPRL(2015)·172 citations
2. 02*

   Electric Dipole Moments: A Global Analysis

   Timothy Chupp🇺🇸 · Michael Ramsey-Musolf🇺🇸

   We perform a global analysis of searches for the permanent electric dipole moments (EDMs) of the neutron, neutral atoms, and molecules in terms of six leptonic, semileptonic, and nonleptonic interactions involving photons, electrons, pions, and nucleons. Translating the results into fundamental CP-violating effective interactions through dimension six involving Standard Model particles, we obtain rough lower bounds on the scale of beyond the Standard Model CP-violating interactions ranging from 1.5 TeV for the electron EDM to 1300 TeV for the nuclear spin-independent electron-quark interaction. We show that future measurements involving systems or combinations of systems with complementary sensitivities to the low-energy parameters may extend the mass reach by an order of magnitude or more.

   ↳ hep-phnucl-exPRC(2015)·153 citations
3. 03*

   CUORE and beyond: bolometric techniques to explore inverted neutrino mass hierarchy

   D. R. Artusa🇺🇸 · F. T. Avignone III🇺🇸 · O. Azzolini🇮🇹 · M. Balata🇮🇹 · T. I. Banks🇺🇸 · G. Bari🇮🇹 · J. Beeman🇺🇸 · F. Bellini🇮🇹 · A. Bersani🇮🇹 · M. Biassoni🇮🇹 · C. Brofferio🇮🇹 · C. Bucci🇮🇹 and 108 other authors

   The CUORE (Cryogenic Underground Observatory for Rare Events) experiment will search for neutrinoless double beta decay of ${}^{130}$Te. With 741 kg of TeO${}_2$ crystals and an excellent energy resolution of 5 keV (0.2%) at the region of interest, CUORE will be one of the most competitive neutrinoless double beta decay experiments on the horizon. With five years of live time, CUORE projected neutrinoless double beta decay half-life sensitivity is $1.6\times 10^{26}$ y at $1\sigma$ ($9.5\times 10^{25}$ y at the 90% confidence level), which corresponds to an upper limit on the effective Majorana mass in the range 40--100 meV (50--130 meV). Further background rejection with auxiliary light detector can significantly improve the search sensitivity and competitiveness of bolometric detectors to fully explore the inverted neutrino mass hierarchy with ${}^{130}$Te and possibly other double beta decay candidate nuclei.

   ↳ physics.ins-dethep-exnucl-exPhys.Procedia(2015)·1 citation

* 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.