Wed·Jun 8, 2016Wednesday·June 8, 2016

1. 01*

   Three pion nucleon coupling constants

   E. Ruiz Arriola🇪🇸 · J. E. Amaro🇪🇸 · R. Navarro Perez🇺🇸

   There exist four pion nucleon coupling constants, $f_{{\pi }^0,pp}$, $-f_{{\pi }^0,nn}$, $f_{{\pi }^{+},pn}/\sqrt{2}$ and $f_{{\pi }^{-},np}/\sqrt{2}$ which coincide when up and down quark masses are identical and the electron charge is zero. While there is no reason why the pion-nucleon-nucleon coupling constants should be identical in the real world, one expects that the small differences might be pinned down from a sufficiently large number of independent and mutually consistent data. Our discussion provides a rationale for our recent determination $$f_p^2=0.0759(4),f_0^2=0.079(1),f_c^2=0.0763(6),$$ based on a partial wave analysis of the $3\sigma$ self-consistent nucleon-nucleon Granada-2013 database comprising 6713 published data in the period 1950-2013.

   ↳ nucl-thhep-phnucl-exMod.Phys.Lett.A(2016)·12 citations
2. 02*

   Rejection of randomly coinciding events in Li${}_2$${}^{100}$MoO${}_4$ scintillating bolometers using light detectors based on the Neganov-Luke effect

   D.M. Chernyak🇺🇦 · F.A. Danevich🇺🇦 · L. Dumoulin🇫🇷 · A. Giuliani🇫🇷 · M. Mancuso🇫🇷 · P. de Marcillac🇫🇷 · S. Marnieros🇫🇷 · C. Nones🇫🇷 · E. Olivieri🇫🇷 · D.V. Poda🇺🇦 · V.I. Tretyak🇺🇦

   Random coincidences of nuclear events can be one of the main background sources in low-temperature calorimetric experiments looking for neutrinoless double-beta decay, especially in those searches based on scintillating bolometers embedding the promising double-beta candidate ${}^{100}$Mo, because of the relatively short half-life of the two-neutrino double-beta decay of this nucleus. We show in this work that randomly coinciding events of the two-neutrino double decay of ${}^{100}$Mo in enriched Li${}_2$${}^{100}$MoO${}_4$ detectors can be effectively discriminated by pulse-shape analysis in the light channel if the scintillating bolometer is provided with a Neganov-Luke light detector, which can improve the signal-to-noise ratio by a large factor, assumed here at the level of $\sim 750$ on the basis of preliminary experimental results obtained with these devices. The achieved pile-up rejection efficiency results in a very low contribution, of the order of $\sim 6\times 10^{-5}$ counts/(keV$\cdot$kg$\cdot$y), to the background counting rate in the region of interest for a large volume ($\sim 90$ cm${}^3$) Li${}_2$${}^{100}$MoO${}_4$ detector. This background level is very encouraging in view of a possible use of the Li${}_2$${}^{100}$MoO${}_4$ solution for a bolometric tonne-scale next-generation experiment as that proposed in the CUPID project.

   ↳ physics.ins-detnucl-exEPJC(2017)·47 citations
3. 03*

   Landau theory of nuclear level density and its application in description of nuclear level density in the region of discrete and s-wave neutron resonance energies

   A.Elmas · H.Ahmadov · B.Gonul

   In this work, the reliability of the Landau expression for the nuclear level density calculations is tested, for the first-time, to describe nuclear level densities of some light, intermediate mass and heavy nuclei at excitations corresponding to discrete and s-wave neutron resonance energies. The chi-2 minimizing method is used in treatment of the experimental data for the two suggested energy range of discrete energies given by Nuclear Data Sheet [1] and by the systematic for nuclear level density parametrization in [2]. Our comparison with the related data in the discrete energy range has shown that the results obtained by the Landau expression are better than those of back-shifted Fermi-gas model and constant temperature approximation. This result is also valid for some nuclei of interest when the s-wave neutron resonance level density is included to check theoretical prescriptions in the energy range from initial bound states to unbound states near the neutron binding energy.

   ↳ nucl-thnucl-ex0 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.