Thu·Jun 13, 2019Thursday·June 13, 2019

1. 01*

   Final result of CUPID-0 phase-I in the search for the ${}^{82}$Se Neutrinoless Double Beta Decay

   O. Azzolini🇮🇹 · J.W. Beeman🇺🇸 · F. Bellini🇮🇹 · M. Beretta🇮🇹 · M. Biassoni🇮🇹 · C. Brofferio🇮🇹 · C. Bucci🇮🇹 · S. Capelli🇮🇹 · L. Cardani🇮🇹 · P. Carniti🇮🇹 · N. Casali🇮🇹 · D. Chiesa🇮🇹 and 32 other authors

   CUPID-0 is the first pilot experiment of CUPID, a next-generation project for the measurement of neutrinoless double beta decay (0$\nu$DBD) with scintillating bolometers. The detector, consisting of 24 enriched and 2 natural ZnSe crystals, has been taking data at Laboratori Nazionali del Gran Sasso from June 2017 to December 2018, collecting a ${}^{82}$Se exposure of 5.29 kg$\times$yr. In this paper we present the phase-I results in the search for 0$\nu$DBD. We demonstrate that the technology implemented by CUPID-0 allows us to reach the lowest background for calorimetric experiments: $(3.5_{-0.9}^{+1.0})\times 10^{-3}$ counts/(keV kg yr). Monitoring 3.88$\times$10${}^{25}$ ${}^{82}$Se nuclei$\times$yr we reach a 90% credible interval median sensitivity of ${\mathrm{T}}_{1/2}^{0\nu }>5.0\times 10^{24}\mathrm{yr}$ and set the most stringent limit on the half-life of ${}^{82}$Se 0$\nu$DBD : ${\mathrm{T}}_{1/2}^{0\nu }>3.5\times 10^{24}\mathrm{yr}$ (90% credible interval), corresponding to m${}_{\beta \beta }<$ (311-638) meV depending on the nuclear matrix element calculations.

   nucl-exhep-exphysics.atom-phphysics.ins-detPRL(2019)·122 citations
2. 02*

   Simultaneous Measurements of the Beta Neutrino Angular Correlation in ${}^{32}$Ar Pure Fermi and Pure Gamow-Teller Transitions using Beta-Proton Coincidences

   V. Araujo-Escalona🇧🇪 · D. Atanasov🇧🇪 · X. Fléchard🇫🇷 · P. Alfaurt🇫🇷 · P. Ascher🇫🇷 · B. Blank🇫🇷 · L. Daudin🇫🇷 · M. Gerbaux🇫🇷 · J. Giovinazzo🇫🇷 · S. Grévy🇫🇷 · T. Kurtukian-Nieto🇫🇷 · E. Liénard🇫🇷 and 5 other authors

   We report first time measurements of the beta-neutrino angular correlation based on the kinetic energy shift of protons emitted in parallel or anti-parallel directions with respect to the positron in the beta decay of ${}^{32}$Ar. This proof of principle experiment provided simultaneous measurements for the superallowed 0${}^{+}$~$\to$~0${}^{+}$ transition followed by a 3356~keV proton emission and for a Gamow-Teller transition followed by a 2123~keV proton emission. The results, respectively ${\tilde{a}}_{\beta \nu }=1.01(3{)}_{(stat)}(2{)}_{(syst)}$ and ${\tilde{a}}_{\beta \nu }=-0.22(9{)}_{(stat)}(2{)}_{(syst)}$, are found in agreement with the Standard Model. A careful analysis of the data shows that future measurements can reach a precision level of 10${}^{-3}$ for both pure Fermi and pure Gamow-Teller decay channels, providing new constraints on both scalar and tensor weak interactions.

   nucl-exPRC(2020)·20 citations
3. 03*

   Measurements of particle spectra in diffractive proton-proton collisions with the STAR detector at RHIC

   Lukasz Fulek🇵🇱

   We present the inclusive and identified particle (pion, proton and their antiparticle) production in Single Diffraction Dissociation and Central Diffraction processes with the STAR detector at RHIC. The forward-scattered proton(s) are tagged in the STAR Roman Pot system while the charged particle tracks are reconstructed in the STAR Time Projection Chamber. Ionization energy loss and time of flight of charged particles are used for particle identification. In addition, the proton-antiproton production asymmetry as a function of rapidity is measured and used to study the baryon number transfer over a large rapidity interval in Single Diffraction Dissociation.

   ↳ hep-exnucl-exActa Phys.Polon.Supp.(2019)·5 citations
4. 04*

   Current Status of r-Process Nucleosynthesis

   T. Kajino🇯🇵 · W. Aoki🇯🇵 · A. B. Balantekin🇺🇸 · R. Diehl🇩🇪 · M. A. Famiano🇺🇸 · G. J. Mathews🇺🇸

   The rapid neutron capture process (r process) is believed to be responsible for about half of the production of the elements heavier than iron and contributes to abundances of some lighter nuclides as well. A universal pattern of r-process element abundances is observed in some metal-poor stars of the Galactic halo. This suggests that a well-regulated combination of astrophysical conditions and nuclear physics conspires to produce such a universal abundance pattern. The search for the astrophysical site for r-process nucleosynthesis has stimulated interdisciplinary research for more than six decades. There is currently much enthusiasm surrounding evidence for r-process nucleosynthesis in binary neutron star mergers in the multi-wavelength follow-up observations of kilonova/gravitational-wave GRB170807A/GW170817. Nevertheless, there remain questions as to the contribution over the history of the Galaxy to the current solar-system r-process abundances from other sites such as neutrino-driven winds or magnetohydrodynamical ejection of material from core-collapse supernovae. In this review we highlight some current issues surrounding the nuclear physics input, astronomical observations, galactic chemical evolution, and theoretical simulations of r-process astrophysical environments with the goal of outlining a path toward resolving the remaining mysteries of the r process.

   ↳ astro-ph.HEnucl-exnucl-thPPNP(2019)·189 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.