Thu·Jan 17, 2019Thursday·January 17, 2019

1. 01*

   Isoscalar pairing interaction for the quasiparticle random-phase approximation approach to double-$\beta$ and $\beta$ decays

   J. Terasaki🇨🇿 · Y. Iwata🇯🇵

   We have proposed in a series of previous papers a method to determine the effective axial-vector current coupling and the strength of the isoscalar proton-neutron pairing interaction for calculating the nuclear matrix elements of the neutrinoless double-$\beta$ decay by the quasiparticle random-phase approximation. The combination of these two parameters have had an uncertainty in this approach, but now this uncertainty is removed. In this paper, we apply our method to the neutrinoless double-$\beta$ decays of ${}^{136}$Xe and ${}^{130}$Te and predict the nuclear matrix elements and reduced half-lives. Our calculation is tested first by a self-check method using the two-neutrino double-$\beta$ decay, and this test ensures the application of our method to ${}^{136}$Xe. It turns out, however, that our method is not successful in ${}^{130}$Te. Further test is made for our calculation of the $\beta$ decay of ${}^{138}$Xe, and a satisfactory result is obtained.

   ↳ nucl-thhep-exnucl-exPRC(2019)·18 citations
2. 02*

   Quantum mechanics aspects and subtleties of neutrino oscillations

   Evgeny Akhmedov🇩🇪

   Neutrino oscillations appear to be a simple quantum mechanical phenomenon. However, a closer look at them reveals a number of subtle points and apparent paradoxes. Some of the basic issues of the theory of neutrino oscillations are still being debated. I discuss, from a historical perspective, how the role of quantum mechanical aspects of neutrino oscillations was realized in the course of the development of the theory of this phenomenon.

   ↳ hep-phhep-exnucl-ex48 citations
3. 03*

   Thermal-FIST: A package for heavy-ion collisions and hadronic equation of state

   Volodymyr Vovchenko🇩🇪 · Horst Stoecker🇩🇪

   Thermal-FIST (Thermal, Fast and Interactive Statistical Toolkit) is a C++ package designed for a convenient general-purpose physics analysis within the family of hadron resonance gas (HRG) models. This mainly includes the statistical analysis of particle production in heavy-ion collisions and the phenomenology of hadronic equation of state. Notable features include fluctuations and correlations of conserved charges, effects of probabilistic decay, chemical non-equilibrium, and inclusion of van der Waals hadronic interactions. Calculations are possible within the grand canonical ensemble, the canonical ensemble, as well as in mixed-canonical ensembles combining the canonical treatment of certain conserved charges with the grand-canonical treatment of other conserved charges. The package contains a fast thermal event generator, which generates particle yields in accordance with the HRG chemistry, and particle momenta based on the Blast Wave model. A distinct feature of this package is the presence of the graphical user interface frontend -- QtThermalFIST -- which is designed for fast and convenient general-purpose HRG model applications.

   ↳ nucl-thhep-phnucl-exComput.Phys.Commun.(2019)·221 citations
4. 04*

   Multi-site event discrimination for the MAJORANA DEMONSTRATOR

   S.I. Alvis🇺🇸 · I.J. Arnquist🇺🇸 · F.T. Avignone III🇺🇸 · A.S. Barabash🇷🇺 · C.J. Barton🇩🇪 · F.E. Bertrand🇺🇸 · B. Bos🇺🇸 · M. Buuck🇺🇸 · T.S. Caldwell🇺🇸 · Y-D. Chan🇺🇸 · C.D. Christofferson🇺🇸 · P.-H. Chu🇺🇸 and 51 other authors

   The MAJORANA DEMONSTRATOR is searching for neutrinoless double-beta decay in 76Ge using arrays of point-contact germanium detectors operating at the Sanford Underground Research Facility. Background results in the neutrinoless double-beta decay region of interest from data taken during construction, commissioning, and the start of full operations have been recently published. A pulse shape analysis cut applied to achieve this result, named AvsE, is described in this paper. This cut is developed to remove events whose waveforms are typical of multi-site energy deposits while retaining (90 +/- 3.5)% of single-site events. This pulse shape discrimination is based on the relationship between the maximum current and energy, and tuned using 228Th calibration source data. The efficiency uncertainty accounts for variation across detectors, energy, and time, as well as for the position distribution difference between calibration and $0\nu \beta \beta$ events, established using simulations.

   ↳ physics.ins-dethep-exnucl-exPRC(2019)·69 citations
5. 05*

   A new off-line ion source facility at IGISOL

   M. Vilén🇫🇮 · L. Canete · B. Cheal🇬🇧 · A. Giatzoglou · R. de Groote🇫🇮 · A. de Roubin🇫🇮 · T. Eronen🇫🇮 · S. Geldhof🇫🇮 · A. Jokinen🇫🇮 · A. Kankainen🇫🇮 · I.D. Moore🇫🇮 · D.A. Nesterenko🇫🇮 and 4 other authors

   An off-line ion source station has been commissioned at the IGISOL (Ion Guide Isotope Separator On-Line) facility. It offers the infrastructure needed to produce stable ion beams from three off-line ion sources in parallel with the radioactive ion beams produced from the IGISOL target chamber. This has resulted in improved feasibility for new experiments by offering reference ions for Penning-trap mass measurements, laser spectroscopy and atom trap experiments.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.B(2020)·28 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.