Wed·Jun 22, 2016Wednesday·June 22, 2016

1. 01*

   Double Beta Decays into Excited States in ${}^{110}$Pd and ${}^{102}$Pd

   B. Lehnert🇩🇪 · E. Andreotti🇧🇪 · D. Degering🇩🇪 · M. Hult🇧🇪 · M. Laubenstein🇮🇹 · T. Wester🇩🇪 · K. Zuber🇩🇪

   A search for double beta decays of ${}^{110}$Pd and ${}^{102}$Pd into excited states of the daughter nuclides has been performed using three ultra-low background gamma-spectrometry measurements in the Felsenkeller laboratory, Germany, the HADES laboratory, Belgium and at the LNGS, Italy. The combined Bayesian analysis of the three measurements sets improved half-life limits for the $2\nu \beta \beta$ and $0\nu \beta \beta$ decay modes of the $2_1^{+}$, $0_1^{+}$ and $2_2^{+}$ transitions in ${}^{110}$Pd to $2.9\cdot 10^{20}$ yr, $4.0\cdot 10^{20}$ yr and $3.0\cdot 10^{20}$ yr respectively and in ${}^{102}$Pd to $7.6\cdot 10^{18}$ yr, $8.8\cdot 10^{18}$ yr and $1.4\cdot 10^{19}$ yr respectively with 90% credibility.

   nucl-exJ.Phys.G(2016)·7 citations
2. 02*

   Antineutrino monitoring of spent nuclear fuel

   Vedran Brdar🇩🇪 · Patrick Huber🇺🇸 · Joachim Kopp🇩🇪

   Military and civilian applications of nuclear energy have left a significant amount of spent nuclear fuel over the past 70 years. Currently, in many countries world wide, the use of nuclear energy is on the rise. Therefore, the management of highly radioactive nuclear waste is a pressing issue. In this letter, we explore antineutrino detectors as a tool for monitoring and safeguarding nuclear waste material. We compute the flux and spectrum of antineutrinos emitted by spent nuclear fuel elements as a function of time, and we illustrate the usefulness of antineutrino detectors in several benchmark scenarios. In particular, we demonstrate how a measurement of the antineutrino flux can help to re-verify the contents of a dry storage cask in case the monitoring chain by conventional means gets disrupted. We then comment on the usefulness of antineutrino detectors at long-term storage facilities such as Yucca mountain. Finally, we put forward antineutrino detection as a tool in locating underground "hot spots" in contaminated areas such as the Hanford site in Washington state.

   ↳ hep-phhep-exnucl-exPhys.Rev.Applied(2017)·27 citations
3. 03*

   Mass dependence and isospin dependence of short-range correlated pairs

   U. Mosel🇩🇪 · K. Gallmeister🇩🇪

   The target-mass number dependence of nucleon-nucleon pairs with short-range correlations is explored in a physically transparent geometrical model within a zero-range approximation. The observed $A$ dependence of 2-nucleon ejection cross sections in $(e,e^{\prime })$ reactions is found to reflect the mass dependence of nuclear density distributions. A parametrization of this $A$ dependence is given. The $A$ dependence of proton-proton vs.\ proton-neutron pairs relative to ${}^{12}$C is also analyzed in this model. It can be understood using simple combinatorics without any additional isospin dependence.

   ↳ nucl-thhep-exhep-phnucl-exPRC(2016)·12 citations
4. 04*

   Correlations of conserved number mixed susceptibilities in a hadron resonance gas model

   D. K. Mishra🇮🇳 · P. K. Netrakanti🇮🇳 · Bedangadas Mohanty🇮🇳

   The ratios of off-diagonal and diagonal susceptibilities of conserved charges are studied using a hadron resonance gas (HRG) model with an emphasis towards providing a proper baseline for comparison to the corresponding future experimental measurements. We have studied the effect of kinematic acceptances, transverse momentum ($p_T$) and pseudorapidity ($\eta$), and different charged states on the ratios of the calculated susceptibilities. We find that the effect of $p_T$ and $\eta$ acceptance on the ratio of the susceptibilities are small relative to their dependence on the beam energy or the charged states of the used particles. We also present a HRG based calculation for various combinations of cumulant ratios of protons and pions, recently proposed as robust observables (with no theoretical uncertainties) for critical point search in the experiments. These results which increase as a function of collision energy will provide a better baseline for non-critical point physics compared to Poisson expectation.

   ↳ hep-phnucl-exnucl-thPRC(2016)·6 citations
5. 05*

   Tests for Comparing Weighted Histograms. Review and Improvements

   Nikolai Gagunashvili🇮🇸

   Histograms with weighted entries are used to estimate probability density functions. Computer simulation is the main application of this type of histograms. A review on chi-square tests for comparing weighted histograms is presented in this paper. Improvements to these tests that have a size closer to its nominal value are proposed. Numerical examples are presented for evaluation and demonstration of various applications of the tests.

   ↳ physics.data-anastro-ph.IMhep-exnucl-ex+1Eur.Phys.J.Plus(2017)·1 citation
6. 06*

   The spin structure of the proton at low $x$ and low $Q^2$ in two-dimensional bins from COMPASS

   A.S. Nunes (for the COMPASS Collaboration)🇵🇹

   The longitudinal double spin asymmetries $A_1^p$ and the spin dependent structure function of the proton $g_1^p$ were extracted from COMPASS data in the region of low Bjorken scaling variable $x$ and low photon virtuality $Q^2$. The data were taken in 2007 and 2011 from scattering of polarised muons off polarised protons, resulting in a sample that is 150 times larger than the one from the previous experiment SMC that pioneered studies in this kinematic region. For the first time, $A_1^p$ and $g_1^p$ were evaluated in this region in two-dimensional bins of kinematic variables: $(x,Q^2)$, $(\nu ,Q^2)$, $(x,\nu )$ and $(Q^2,x)$. The following kinematic region was investigated: $4\times 10^{-5}<x<4\times 10^{-2}$, $0.001$~(GeV/$c$)${}^2<Q^2<1$~(GeV/$c$)${}^2$ and $14$~GeV$<\nu <194$~GeV. The obtained results were confronted with theoretical models.

   ↳ hep-exnucl-exPoS(2016)·0 citations
7. 07*

   Particle production and equilibrium properties within a new hadron transport approach for heavy-ion collisions

   J. Weil🇩🇪 · V. Steinberg🇩🇪 · J. Staudenmaier🇩🇪 · L.G. Pang🇩🇪 · D. Oliinychenko🇺🇦 · J. Mohs🇩🇪 · M. Kretz🇩🇪 · T. Kehrenberg🇩🇪 · A. Goldschmidt🇺🇸 · B. Bäuchle🇩🇪 · J. Auvinen🇺🇸 · M. Attems🇪🇸 · H. Petersen🇩🇪

   The microscopic description of heavy-ion reactions at low beam energies is achieved within hadronic transport approaches. In this article a new approach SMASH (Simulating Many Accelerated Strongly-interacting Hadrons) is introduced and applied to study the production of non-strange particles in heavy-ion reactions at $E_{\mathrm{kin}}=0.4-2A$ GeV. First, the model is described including details about the collision criterion, the initial conditions and the resonance formation and decays. To validate the approach, equilibrium properties such as detailed balance are presented and the results are compared to experimental data for elementary cross sections. Finally results for pion and proton production in C+C and Au+Au collisions is confronted with HADES and FOPI data. Predictions for particle production in $\pi +A$ collisions are made.

   ↳ nucl-thhep-phnucl-exPRC(2016)·455 citations
8. 08*

   The MAGNEX spectrometer: results and perspectives

   F. Cappuzzello🇮🇹 · C. Agodi🇮🇹 · D. Carbone🇮🇹 · M. Cavallaro🇮🇹

   This article discusses the main achievements and future perspectives of the MAGNEX spectrometer at the INFN-LNS laboratory in Catania (Italy). MAGNEX is a large acceptance magnetic spectrometer for the detection of the ions emitted in nuclear collisions below Fermi energy. In the first part of the paper an overview of the MAGNEX features is presented. The successful application to the precise reconstruction of the momentum vector, to the identification of the ion masses and to the determination of the transport efficiency is demonstrated by in-beam tests. In the second part, an overview of the most relevant scientific achievements is given. Results from nuclear elastic and inelastic scattering as well as from transfer and charge exchange reactions in a wide range of masses of the colliding systems and incident energies are shown. The role of MAGNEX in solving old and new puzzles in nuclear structure and direct reaction mechanisms is emphasized. One example is the recently observed signature of the long searched Giant Pairing Vibration. Finally, the new challenging opportunities to use MAGNEX for future experiments are briefly reported. In particular, the use of double charge exchange reactions toward the determination of the nuclear matrix elements entering in the expression of the half-life of neutrinoless double beta decay is discussed. The new NUMEN project of INFN, aiming at these investigations, is introduced. The challenges connected to the major technical upgrade required by the project in order to investigate rare processes under high fluxes of detected heavy ions are outlined.

   ↳ physics.ins-detnucl-exEPJA(2016)·161 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.