Mon·Sep 16, 2019Monday·September 16, 2019

1. 01*

   Status on ${}^{12}\mathrm{C}+{}^{12}\mathrm{C}$ fusion at deep subbarrier energies: impact of resonances on astrophysical $S^{\ast }$ factors

   C. Beck🇫🇷 · A. M. Mukhamedzhanov🇺🇸 · X. Tang🇨🇳

   Since the discovery of molecular resonances in ${}^{12}$C+${}^{12}$C in the early sixties a great deal of research work has been undertaken to study $\alpha$-clustering and resonant effects of the fusion process at sub-Coulomb barrier energies. The modified astrophysical $S^{\ast }$ factors of ${}^{12}$C+${}^{12}$C fusion have been extracted from direct fusion measurements at deep sub-barrier energies near the Gamow window. They were also obtained by the indirect Trojan horse method (THM). A comparison of direct measurements and the THM, which elucidates problems in the analysis of the THM, is discussed in this Letter to the Editor.

   nucl-exastro-ph.SRnucl-thEPJA(2020)·38 citations
2. 02*

   First Constraint on Coherent Elastic Neutrino-Nucleus Scattering in Argon

   COHERENT Collaboration: D. Akimov🇷🇺 · J. B. Albert🇺🇸 · P. An🇺🇸 · C. Awe🇺🇸 · P. S. Barbeau🇺🇸 · B. Becker🇺🇸 · V. Belov🇷🇺 · M. A. Blackston🇺🇸 · A. Bolozdynya🇷🇺 · B. Cabrera-Palmer🇺🇸 · M. Cervantes🇺🇸 · J. I. Collar🇺🇸 and 67 other authors

   Coherent elastic neutrino-nucleus scattering (CEvNS) is the dominant neutrino scattering channel for neutrinos of energy $E_{\nu }<100$ MeV. We report a limit for this process using data collected in an engineering run of the 29 kg CENNS-10 liquid argon detector located 27.5 m from the Oak Ridge National Laboratory Spallation Neutron Source (SNS) Hg target with $4.2\times 10^{22}$ protons on target. The dataset yielded $<7.4$ observed CEvNS events implying a cross section for the process, averaged over the SNS pion decay-at-rest flux, of $<3.4\times 10^{-39}$ cm${}^2$, a limit within twice the Standard Model prediction. This is the first limit on CEvNS from an argon nucleus and confirms the earlier CsI non-standard neutrino interaction constraints from the collaboration. This run demonstrated the feasibility of the ongoing experimental effort to detect CEvNS with liquid argon.

   ↳ hep-exnucl-exPRD(2019)·52 citations
3. 03*

   An improved upper limit on the neutrino mass from a direct kinematic method by KATRIN

   M. Aker · K. Altenmüller · M. Arenz · M. Babutzka · J. Barrett · S. Bauer · M. Beck · A. Beglarian · J. Behrens · T. Bergmann · U. Besserer · K. Blaum and 197 other authors

   We report on the neutrino mass measurement result from the first four-week science run of the Karlsruhe Tritium Neutrino experiment KATRIN in spring 2019. Beta-decay electrons from a high-purity gaseous molecular tritium source are energy analyzed by a high-resolution MAC-E filter. A fit of the integrated electron spectrum over a narrow interval around the kinematic endpoint at 18.57 keV gives an effective neutrino mass square value of $(-1.0_{-1.1}^{+0.9})$ eV${}^2$. From this we derive an upper limit of 1.1 eV (90$\%$ confidence level) on the absolute mass scale of neutrinos. This value coincides with the KATRIN sensitivity. It improves upon previous mass limits from kinematic measurements by almost a factor of two and provides model-independent input to cosmological studies of structure formation.

   ↳ hep-exastro-ph.COnucl-exphysics.ins-detPRL(2019)·662 citations
4. 04*

   First operation of the KATRIN experiment with tritium

   M. Aker🇩🇪 · K. Altenmüller🇩🇪 · M. Arenz🇩🇪 · W.-J. Baek🇩🇪 · J. Barrett🇺🇸 · A. Beglarian🇩🇪 · J. Behrens🇩🇪 · A. Berlev🇷🇺 · U. Besserer🇩🇪 · K. Blaum🇩🇪 · F. Block🇩🇪 · S. Bobien🇩🇪 and 159 other authors

   The determination of the neutrino mass is one of the major challenges in astroparticle physics today. Direct neutrino mass experiments, based solely on the kinematics of beta-decay, provide a largely model-independent probe to the neutrino mass scale. The Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to directly measure the effective electron antineutrino mass with a sensitivity of 0.2 eV 90% CL. In this work we report on the first operation of KATRIN with tritium which took place in 2018. During this commissioning phase of the tritium circulation system, excellent agreement of the theoretical prediction with the recorded spectra was found and stable conditions over a time period of 13 days could be established. These results are an essential prerequisite for the subsequent neutrino mass measurements with KATRIN in 2019.

   ↳ physics.ins-detastro-ph.COhep-exnucl-exEPJC(2020)·53 citations
5. 05*

   Bayesian unfolding of charged particle $p_{\mathrm{T}}$ spectra with ALICE at the LHC

   Mario Krüger (for the ALICE Collaboration)🇩🇪

   The study of the Quark-Gluon Plasma created in ultrarelativistic heavy-ion collisions at the CERN-LHC is complemented by reference measurements in proton-lead (p--Pb) and proton-proton (pp) collisions, where the effects of multiple-parton interactions and hadronization beyond independent string fragmentation can be investigated. In these proceedings, we present a Bayesian unfolding procedure to reconstruct the correlation between transverse momentum ($p_{\mathrm{T}}$) spectra of charged particles and the corresponding charged-particle multiplicities $N_{\mathrm{ch}}$. The unfolded spectra are presented in single multiplicity ($\Delta N_{\mathrm{ch}}$ = 1) bins and are used to derive moments of the $p_{\mathrm{T}}$ distributions. We illustrate the unfolding procedure of the $p_{\mathrm{T}}$ spectra with a Monte Carlo simulation for pp collisions at a centre-of-mass energy of $\sqrt{\mathrm{s}}=5.02$ TeV.

   ↳ hep-exnucl-exPoS(2018)·3 citations
6. 06*

   Measurements of hadron production in ${\pi }^{+}$ + C and ${\pi }^{+}$ + Be interactions at 60 GeV/$c$

   NA61/SHINE Collaboration: A. Aduszkiewicz🇵🇱 · E.V. Andronov🇷🇺 · T. Antićić🇭🇷 · V. Babkin🇷🇺 · M. Baszczyk🇵🇱 · S. Bhosale🇵🇱 · A. Blondel🇨🇭 · M. Bogomilov🇧🇬 · A. Brandin🇷🇺 · A. Bravar🇨🇭 · W. Bryliński🇵🇱 · J. Brzychczyk🇵🇱 and 133 other authors

   Precise knowledge of hadron production rates in the generation of neutrino beams is necessary for accelerator-based neutrino experiments to achieve their physics goals. NA61/SHINE, a large-acceptance hadron spectrometer, has recorded hadron+nucleus interactions relevant to ongoing and future long-baseline neutrino experiments at Fermi National Accelerator Laboratory. This paper presents three analyses of interactions of 60 GeV/$c$ ${\pi }^{+}$ with thin, fixed carbon and beryllium targets. Integrated production and inelastic cross sections were measured for both of these reactions. In an analysis of strange, neutral hadron production, differential production multiplicities of $K_S^0$, $\Lambda$ and anti-$\Lambda$ were measured. Lastly, in an analysis of charged hadron production, differential production multiplicities of ${\pi }^{+}$, ${\pi }^{-}$, $K^{+}$, $K^{-}$ and protons were measured. These measurements will enable long-baseline neutrino experiments to better constrain predictions of their neutrino flux in order to achieve better precision on their neutrino cross section and oscillation measurements.

   ↳ hep-exnucl-exPRD(2019)·23 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.