Wed·Jan 11, 2017Wednesday·January 11, 2017

1. 01*

   Nuclear Structure Studies of Neutron-Rich Nuclei : Astrophysical Implications

   O. Sorlin (GANIL)🇫🇷

   It is proposed here to investigate three major properties of the nuclear force that influence the amplitude of shell gaps, the nuclear binding energies as well as the nuclear $\beta$-decay properties far from stability, that are all key ingredients for modeling the r-process nucleosynthesis. These properties are derived from experiments performed in different facilities worldwide, using several various state-of-the-art experimental techniques including transfer and knockout reactions. Expected consequences on the r process nucleosynthesis as well as on the stability of super heavy elements are discussed.

   nucl-exnucl-thJPS Conf.Proc.(2017)·0 citations
2. 02*

   Sensitivity of the NEXT-100 detector to neutrinoless double beta decay

   N. Lopez-March (on behalf of the NEXT collaboration)🇪🇸

   A high pressure xenon gas time projection chamber with electroluminescent amplification (EL HPGXe TPC) searching for the neutrinoless double beta ($0\nu \beta \beta$) decay offers: excellent energy resolution ($0.5-0.7\%$ FWHM at the $Q_{\beta \beta }$), by amplifying the ionization signal with electroluminescent light, and tracking capabilities, as demonstrated by the NEXT collaboration using two kg-scale prototypes. The NEXT collaboration is building an EL HPGXe TPC capable of holding 100 kg (NEXT-100) of xenon isotopically enriched in ${}^{136}\mathrm{Xe}$. The installation and commissioning of the NEXT-100 detector at the Laboratorio Subterráneo de Canfranc (LSC) is planned for 2018. The current estimated background level for the NEXT-100 detector is of $4\times 10^{-4}$ counts/keV-kg-yr or less in the energy region of interest. Assuming an energy resolution of 0.75$\%$ FWHM at the $Q_{\beta \beta }$ and a $0\nu \beta \beta$ signal efficiency of about 28$\%$, this gives an expected sensitivity (at 90$\%$ CL) to the $0\nu \beta \beta$ decay half life of $T_{1/2}^{0\nu }>6.0\times 10^{25}$ yr for an exposure of 275 kg yr. A first phase of the NEXT experiment, called NEW, is currently being commissioned at the LSC. The NEW detector is a scale 1:2 in size (1:10 in mass) of the NEXT-100 detector using the same materials and photosensors and will be used to perform a characterization of the $0\nu \beta \beta$ backgrounds and a measurement of the standard double beta decay with neutrinos ($2\nu \beta \beta$). An 8 sigma significance for the $2\nu \beta \beta$ signal in the NEW detector has been estimated for a 100-day run.

   ↳ physics.ins-dethep-exnucl-exJ.Phys.Conf.Ser.(2017)·7 citations
3. 03*

   Missing resonance decays in thermal models

   V.V. Begun🇵🇱 · V.Yu. Vovchenko🇩🇪 · M.I. Gorenstein🇺🇦

   Detailed information on decay channel probabilities is absent for many high mass resonances, which are typically included in thermal models. In these cases, the sum over all known decay branching probabilities is smaller than 1. Due to this systematic uncertainty of the model, the exact charge conservation may appear to be violated. We estimate the corresponding number of missing charge states in the canonical ensemble formulation of the hadron resonance gas for p+p reactions at the SPS energy $E_{\mathrm{lab}}=158$ GeV: $\Delta B\simeq 0.16$ for baryon charge, $\Delta Q\simeq 0.12$ for electric charge, and $\Delta S=-0.01$ for strangeness. The value of the considered effect is 5-8%, which seems to be important enough to include it as a systematic error in the calculations within a hadron gas.

   ↳ nucl-thhep-exhep-phnucl-ex1 citation

* 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.