Mon·Nov 13, 2017Monday·November 13, 2017

1. 01*

   Investigation of 2$\beta$ Decay of ${}^{116}$Cd with the Help of Enriched ${}^{116}$CdWO${}_4$ Crystal Scintillators

   O.G. Polischuk🇺🇦 · A.S. Barabash🇷🇺 · P. Belli🇮🇹 · R. Bernabei🇮🇹 · F. Cappella🇮🇹 · V. Caracciolo🇮🇹 · R. Cerulli🇮🇹 · D.M. Chernyak🇺🇦 · F.A. Danevich🇺🇦 · S. d'Angelo🇮🇹 · A. Incicchitti🇮🇹 · D.V. Kasperovych🇺🇦 and 9 other authors

   Double beta decay of ${}^{116}$Cd has been investigated with the help of radiopure enriched ${}^{116}$CdWO${}_4$ crystal scintillators in the experiment Aurora. The half-life of ${}^{116}$Cd relatively to the 2$\nu$2$\beta$ decay of ${}^{116}$Cd to the ground level of ${}^{116}$Sn is measured with the highest up-to-date accuracy as $T_{1/2}$ = [2.69 $\pm$ 0.02 (stat.) $\pm$ 0.14 (syst.)] $\times$ 10${}^{19}$ yr. A new improved limit on the 0$\nu$2$\beta$ decay of ${}^{116}$Cd to the ground state of ${}^{116}$Sn is set as $T_{1/2}\ge 2.4\times 10^{23}$ yr at 90\% C.L., that corresponds to the effective Majorana neutrino mass limit in the range $⟨$$m_{\nu }$$⟩$ $\le$ $(1.1-1.6)$ eV, depending on the nuclear matrix elements used in the estimations. New improved limits on other $2\beta$ processes in ${}^{116}$Cd (decays with majoron emission, transitions to excited levels of ${}^{116}$Sn) were set at the level of $T_{1/2}\ge 10^{21}-10^{22}$ yr.

   nucl-exAIP Conf.Proc.(2017)·11 citations
2. 02*

   Controlling $T_c$ of Iridium films using interfacial proximity effects

   R. Hennings-Yeomans🇺🇸 · C.L. Chang🇺🇸 · J. Ding🇺🇸 · A. Drobizhev🇺🇸 · B.K. Fujikawa🇺🇸 · S. Han🇺🇸 · G. Karapetrov🇺🇸 · Yu.G. Kolomensky🇺🇸 · V. Novosad🇺🇸 · T.O'Donnell🇺🇸 · J.L. Ouellet🇺🇸 · J. Pearson🇺🇸 and 8 other authors

   High precision calorimetry using superconducting transition edge sensors requires the use of superconducting films with a suitable $T_c$, depending on the application. To advance high-precision macrocalorimetry, we require low-$T_c$ films that are easy to fabricate. A simple and effective way to suppress $T_c$ of superconducting Iridium through the proximity effect is demonstrated by using Ir/Pt bilayers as well as Au/Ir/Au trilayers. While Ir/Au films fabricated by applying heat to the substrate during Ir deposition have been used in the past for superconducting sensors, we present results of $T_c$ suppression on Iridium by deposition at room temperature in Au/Ir/Au trilayers and Ir/Pt bilayers in the range of $\sim$20-100~mK. Measurements of the relative impedance between the Ir/Pt bilayers and Au/Ir/Au trilayers fabricated show factor of $\sim$10 higher values in the Ir/Pt case. These new films could play a key role in the development of scalable superconducting transition edge sensors that require low-$T_c$ films to minimize heat capacity and maximize energy resolution, while keeping high-yield fabrication methods.

   ↳ physics.ins-dethep-exnucl-ex1 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.