Thu·Jul 10, 2014Thursday·July 10, 2014

1. 01*

   A Dark Matter Search with MALBEK

   G.K. Giovanetti🇺🇸 · N. Abgrall🇺🇸 · E. Aguayo🇺🇸 · F.T. Avignone III🇺🇸 · A.S. Barabash🇷🇺 · F.E. Bertrand🇺🇸 · M. Boswell🇺🇸 · V. Brudanin🇷🇺 · M. Busch🇺🇸 · D. Byram🇺🇸 · A.S. Caldwell🇺🇸 · Y-D. Chan🇺🇸 and 75 other authors

   The MAJORANA DEMONSTRATOR is an array of natural and enriched high purity germanium detectors that will search for the neutrinoless double-beta decay of 76-Ge and perform a search for weakly interacting massive particles (WIMPs) with masses below 10 GeV. As part of the MAJORANA research and development efforts, we have deployed a modified, low-background broad energy germanium detector at the Kimballton Underground Research Facility. With its sub-keV energy threshold, this detector is sensitive to potential non-Standard Model physics, including interactions with WIMPs. We discuss the backgrounds present in the WIMP region of interest and explore the impact of slow surface event contamination when searching for a WIMP signal.

   nucl-exhep-exphysics.ins-detPhys.Procedia(2015)·39 citations
2. 02*

   Disproof of solar influence on the decay rates of 90Sr/90Y

   Karsten Kossert · Ole Nähle

   A custom-built liquid scintillation counter was used for long-term measurements of 90Sr/90Y sources. The detector system is equipped with an automated sample changer and three photomultiplier tubes, which makes the application of the triple-to-double coincidence ratio (TDCR) method possible. After decay correction, the measured decay rates were found to be stable and no annual oscillation could be observed. Thus, the findings of this work are in strong contradiction to those of Parkhomov [1] who reported on annual oscillations when measuring 90Sr/90Y with a Geiger-Müller counter. Sturrock et al. [2] carried out a more detailed analysis of the experimental data from Parkhomov and claimed to have found correlations between the decay rates and processes inside the Sun. These findings are questionable, since they are based on inappropriate experimental data as is demonstrated in this work. A frequency analysis of our activity data does not show any significant periodicity.

   nucl-exAstropart.Phys.(2015)·31 citations
3. 03*

   J=0, J=J_{max} and quadrupole pairing

   Larry Zamick🇺🇸 · Daniel Hertz-Kintish

   We consider 2 neutrons and 2 protons in the g_{9/2} shell.Wave functions and energy levels are obtained for various interactions. The wave functions for states with total angular momentum I greater or equal to 10 are not affected by what the pairing interacton (J=0 T=1) is.Other parts of the interaction are therefore of increased importance.

   ↳ nucl-thnucl-exquant-phAnnals Phys.(2014)·2 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.