Wed·Mar 30, 2016Wednesday·March 30, 2016

1. 01*

   Laser induced nuclear waste transmutation

   Charles Hirlimann (IPCMS)

   When producing electricity that collects the mass energy that is available at the time of the induced disintegration of radioactive elements, other unstable elements are produced with half-life span durations ranging from less than one second to hundreds of thousands of years and which are considered as waste. Managing nuclear waste with a half-life of less than 30 years is an easy task, as our societies clearly know how to keep buildings safe for more than a century, the time it takes for the activity to be divided by a factor of 8. High-activity, long-lasting waste that can last for thousands of years or even longer, up to geological time laps, cannot be taken care of for such long durations. Therefore, these types of waste are socially unacceptable; nobody wants to leave a polluted planet to descendants.

   nucl-ex0 citations
2. 02*

   Strong interaction studies with kaonic atoms

   J. Marton🇦🇹 · M. Bazzi🇮🇹 · G. Beer🇨🇦 · C. Berucci🇦🇹 · D. Bosnar🇭🇷 · A.M. Bragadireanu🇷🇴 · M. Cargnelli🇦🇹 · A. Clozza🇮🇹 · C. Curceanu🇮🇹 · A. d'Uffizi🇮🇹 · C. Fiorini🇮🇹 · F. Ghio🇮🇹 and 21 other authors

   The strong interaction of antikaons with nucleons and nuclei in the low-energy regime represents an active research field connected intrinsically with few-body physics. There are important open questions like the question of antikaon nuclear bound states. A unique and rather direct experimental access to the antikaon-nucleon scattering lengths is provided by precision X-ray spectroscopy of transitions in low-lying states of light kaonic atoms like kaonic hydrogen isotopes. In the SIDDHARTA experiment at the electron-positron collider DAFNE of LNF-INFN we measured the most precise values of the strong interaction observables, i.e. the strong interaction on the 1s ground state of the electromagnetically bound kaonic hydrogen atom leading to a hadronic shift and a hadronic broadening of the 1s state. The SIDDHARTA result triggered new theoretical work which achieved major progress in the understanding of the low-energy strong interaction with strangeness. Antikaon-nucleon scattering lengths have been calculated constrained by the SIDDHARTA data on kaonic hydrogen. For the extraction of the isospin-dependent scattering lengths a measurement of the hadronic shift and width of kaonic deuterium is necessary. Therefore, new X-ray studies with the focus on kaonic deuterium are in preparation (SIDDHARTA2). Many improvements in the experimental setup will allow to measure kaonic deuterium which is challenging due to the anticipated low X-ray yield. Especially important are the data on the X-ray yields of kaonic deuterium extracted from a exploratory experiment within SIDDHARTA.

   nucl-exEPJ Web Conf.(2016)·1 citation
3. 03*

   Tests of constituent-quark generation methods which maintain both the nucleon center of mass and the desired radial distribution in Monte Carlo Glauber models

   J. T. Mitchell🇺🇸 · D. V. Perepelitsa🇺🇸 · M. J. Tannenbaum🇺🇸 · P. W. Stankus🇺🇸

   Several methods of generating three constituent-quarks in a nucleon are evaluated which explicitly maintain the nucleon's center of mass and desired radial distribution and can be used within Monte Carlo Glauber frameworks. The geometric models provided by each method are used to generate distributions over the number of constituent-quark participants ($N_{qp}$) in $p+p$, $d+$Au and Au$+$Au collisions. The results are compared with each other and to a previous result of $N_{qp}$ calculations, without this explicit constraint, used in measurements of $\sqrt{s_{{}_{NN}}}$=200 GeV $p+p$, $d+$Au and Au$+$Au collisions at RHIC.

   nucl-exPRC(2016)·43 citations
4. 04*

   Combination of two Gas Electron Multipliers and a Micromegas as gain elements for a time projection chamber

   S. Aiola🇺🇸 · R. J. Ehlers🇺🇸 · S. Gu🇺🇸 · J. W. Harris🇺🇸 · R. Majka🇺🇸 · J.D. Mulligan🇺🇸 · M. Oliver🇺🇸 · J. Schambach🇺🇸 · N. Smirnov🇺🇸

   We measured the properties of a novel combination of two Gas Electron Multipliers with a Micromegas for use as amplification devices in high-rate gaseous time projection chambers. The goal of this design is to minimize the buildup of space charge in the drift volume of such detectors in order to eliminate the standard gating grid and its resultant dead time, while preserving good tracking and particle identification performance. We measured the positive ion back-flow and energy resolution at various element gains and electric fields, using a variety of gases, and additionally studied crosstalk effects and discharge rates. At a gain of 2000, this configuration achieves an ion back-flow below 0.4% and an energy resolution better than $\sigma /\text{E}=12\%$ for ${}^{55}$Fe X-rays.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2016)·16 citations
5. 05*

   High voltage testing for the MAJORANA Demonstrator

   N. Abgrall🇺🇸 · I.J. Arnquist🇺🇸 · F.T. Avignone III🇺🇸 · A.S. Barabash🇷🇺 · F.E. Bertrand🇺🇸 · A.W. Bradley🇺🇸 · V. Brudanin🇷🇺 · M. Busch🇺🇸 · M. Buuck🇺🇸 · D. Byram🇺🇸 · A.S. Caldwell🇺🇸 · Y-D. Chan🇺🇸 and 61 other authors

   The MAJORANA Collaboration is constructing the MAJORANA Demonstrator, an ultra-low background, 44-kg modular high-purity Ge (HPGe) detector array to search for neutrinoless double-beta decay in Ge-76. The phenomenon of surface micro-discharge induced by high-voltage has been studied in the context of the MAJORANA Demonstrator. This effect can damage the front-end electronics or mimic detector signals. To ensure the correct performance, every high-voltage cable and feedthrough must be capable of supplying HPGe detector operating voltages as high as 5 kV without exhibiting discharge. R&D measurements were carried out to understand the testing system and determine the optimum design configuration of the high-voltage path, including different improvements of the cable layout and feedthrough flange model selection. Every cable and feedthrough to be used at the MAJORANA Demonstrator was characterized and the micro-discharge effects during the MAJORANA Demonstrator commissioning phase were studied. A stable configuration has been achieved, and the cables and connectors can supply HPGe detector operating voltages without exhibiting discharge.

   ↳ physics.ins-dethep-exnucl-exNucl.Instrum.Meth.A(2016)·15 citations
6. 06*

   Rapidity fluctuations in the initial state

   Wojciech Broniowski🇵🇱 · Piotr Bozek🇵🇱

   We analyze two-particle pseudorapidity correlations in a simple model, where strings of fluctuating length are attached to wounded nucleons.The obtained straightforward formulas allow us to understand the anatomy of the correlations, i.e., to identify the component due to the fluctuation of the number of wounded nucleons and the contribution from the string length fluctuations. Our results reproduce qualitatively and semiquantitatively the basic features of the recent correlation measurements at the LHC.

   ↳ nucl-thnucl-exActa Phys.Polon.Supp.(2016)·3 citations
7. 07*

   Direct Neutrino Mass Experiments and Exotic Charged Current Interactions

   Patrick Otto Ludl🇩🇪 · Werner Rodejohann🇩🇪

   We study the effect of exotic charged current interactions on the electron energy spectrum in tritium decay, focussing on the KATRIN experiment and a possible modified setup that has access to the full spectrum. Both sub-eV and keV neutrino masses are considered. We perform a fully relativistic calculation and take all possible new interactions into account, demonstrating the possible sizable distortions in the energy spectrum.

   ↳ hep-phhep-exnucl-exnucl-thJHEP(2016)·40 citations
8. 08*

   Coherency in Neutrino-Nucleus Elastic Scattering

   S. Kerman🇹🇼 · V. Sharma🇹🇼 · M. Deniz🇹🇼 · H.T. Wong🇹🇼 · J.-W. Chen🇹🇼 · H.B. Li🇹🇼 · S.T. Lin🇨🇳 · C.-P. Liu🇹🇼 · Q. Yue (TEXONO Collaboration)🇨🇳

   Neutrino-nucleus elastic scattering provides a unique laboratory to study the quantum mechanical coherency effects in electroweak interactions, towards which several experimental programs are being actively pursued. We report results of our quantitative studies on the transitions towards decoherency. A parameter ($\alpha$) is identified to describe the degree of coherency, and its variations with incoming neutrino energy, detector threshold and target nucleus are studied. The ranges of $\alpha$ which can be probed with realistic neutrino experiments are derived, indicating complementarity between projects with different sources and targets. Uncertainties in nuclear physics and in $\alpha$ would constrain sensitivities in probing physics beyond the standard model. The maximum neutrino energies corresponding to $\alpha$>0.95 are derived.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2016)·77 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.