Fri·Nov 7, 2014Friday·November 7, 2014

1. 01*

   A critical look at the vibrational model for ^{92}Pd and comparison with ^{48}Cr

   Shadow Robinson🇺🇸 · Castaly Fan · Matthew Harper · Larry Zamick🇺🇸

   We compare the effects of turning off and turning on the T=0 interaction on the spectra of 92Pd and 48Cr--both 8 particle systems. We find qualitative differences for the 2 nuclei.Turning the T=0 interaction off destroys the linearity in 92Pd but not in 48Cr. We also consider B(E2)'s and static quadruple moments.

   ↳ nucl-thnucl-exIJMPE(2021)·4 citations
2. 02*

   Testing GeV-Scale Dark Matter with Fixed-Target Missing Momentum Experiments

   Eder Izaguirre🇨🇦 · Gordan Krnjaic🇨🇦 · Philip Schuster🇨🇦 · Natalia Toro🇨🇦

   We describe an approach to detect dark matter and other invisible particles with mass below a GeV, exploiting missing energy-momentum measurements and other kinematic features of fixed-target production. In the case of an invisibly decaying MeV-GeV-scale dark photon, this approach can improve on present constraints by 2-6 orders of magnitude over the entire mass range, reaching sensitivity as low as ${ϵ}^2\sim 10^{-14}$. Moreover, the approach can explore essentially all of the viable parameter space for thermal or asymmetric dark matter annihilating through the vector portal.

   ↳ hep-phastro-ph.COhep-exnucl-exPRD(2015)·136 citations
3. 03*

   Radiopurity assessment of the tracking readout for the NEXT double beta decay experiment

   S. Cebrián · J. Pérez · I. Bandac · L. Labarga · V. Álvarez · A.I. Barrado · A. Bettini · F.I.G.M. Borges · M. Camargo · S. Cárcel · A. Cervera · C.A.N. Conde and 59 other authors

   The Neutrino Experiment with a Xenon Time-Projection Chamber (NEXT) is intended to investigate the neutrinoless double beta decay of 136Xe, which requires a severe suppression of potential backgrounds; therefore, an extensive screening and selection process is underway to control the radiopurity levels of the materials to be used in the experimental set-up of NEXT. The detector design combines the measurement of the topological signature of the event for background discrimination with the energy resolution optimization. Separate energy and tracking readout planes are based on different sensors: photomultiplier tubes for calorimetry and silicon multi-pixel photon counters for tracking. The design of a radiopure tracking plane, in direct contact with the gas detector medium, was specially challenging since the needed components like printed circuit boards, connectors, sensors or capacitors have typically, according to available information in databases and in the literature, activities too large for experiments requiring ultra-low background conditions. Here, the radiopurity assessment of tracking readout components based on gamma-ray spectroscopy using ultra-low background germanium detectors at the Laboratorio Subterraneo de Canfranc (Spain) is described. According to the obtained results, radiopure enough printed circuit boards made of kapton and copper, silicon photomultipliers and other required components, fulfilling the requirement of an overall background level in the region of interest of at most 8 10-4 counts keV-1 kg-1 y-1, have been identified.

   ↳ physics.ins-dethep-exnucl-exJINST(2015)·37 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.