We report the direct observation of muon neutrino interactions with the SND@LHC detector at the Large Hadron Collider. A dataset of proton-proton collisions at sqrts=13.6 TeV collected by SND@LHC in ...2022 is used, corresponding to an integrated luminosity of 36.8 fb^{-1}. The search is based on information from the active electronic components of the SND@LHC detector, which covers the pseudorapidity region of 7.2<η<8.4, inaccessible to the other experiments at the collider. Muon neutrino candidates are identified through their charged-current interaction topology, with a track propagating through the entire length of the muon detector. After selection cuts, 8 ν_{μ} interaction candidate events remain with an estimated background of 0.086 events, yielding a significance of about 7 standard deviations for the observed ν_{μ} signal.
Phys. Rev. C (2022) Motivated by the recent observation of high-mass pulsars ($M \simeq 2
M_{\odot}$), we employ the $\sigma$-cut potential on the equation of state
(EOS) of high-density matter and ...the properties of neutron stars within the
relativistic mean-field (RMF) model using TM1$^{*}$ parameter set. The
$\sigma$-cut potential is known to reduce the contributions of the $\sigma$
field, resulting in a stiffer EOS at high densities and hence leading to larger
neutron star masses without affecting the properties of nuclear matter at
normal saturation density. We also analyzed the effect of the same on pure
neutron matter and also on the neutron star matter with and without hyperonic
core and compared it with the available theoretical, experimental, and
observational data. The corresponding tidal deformability ($\Lambda_{1.4}$) is
also calculated. With the choice of meson-hyperon coupling fixed to
hypernuclear potentials, we obtain $\approx 10~\%$ increase in mass by
employing the $\sigma$-cut potential for $f_{s} = 0.6$. Our results are in good
agreement with various experimental constraints and observational data,
particularly with the GW170817 data.
As a prototype detector for the SHiP Surrounding Background Tagger (SBT), we constructed a cell (120 cm x 80 cm x 25 cm) made from corten steel that is filled with liquid scintillator (LS) composed ...of linear alkylbenzene (LAB) and 2,5-diphenyloxazole (PPO). The detector is equipped with two Wavelength-shifting Optical Modules (WOMs) for light collection of the primary scintillation photons. Each WOM consists of an acrylic tube that is dip-coated with a wavelength-shifting layer on its surface. Via internal total reflection, the secondary photons emitted by the molecules of the wavelength shifter are guided to a ring-shaped array of 40 silicon photomultipliers (SiPMs) coupled to the WOM for light detection. The granularity of these SiPM arrays provides an innovative method to gain spatial information on the particle crossing point. Several improvements in the detector design significantly increased the light yield with respect to earlier proof-of-principle detectors. We report on the performance of this prototype detector during an exposure to high-energy positrons at the DESY II test beam facility by measuring the collected integrated yield and the signal time-of-arrival in each of the SiPM arrays. The resulting detection efficiency and reconstructed energy deposition of the incident positrons are presented, as well as the spatial and time resolution of the detector. These results are then compared to Monte Carlo simulations.
Motivated by the recent observation of high-mass pulsars (\(M \simeq 2 M_{\odot}\)), we employ the \(\sigma\)-cut potential on the equation of state (EOS) of high-density matter and the properties of ...neutron stars within the relativistic mean-field (RMF) model using TM1\(^{*}\) parameter set. The \(\sigma\)-cut potential is known to reduce the contributions of the \(\sigma\) field, resulting in a stiffer EOS at high densities and hence leading to larger neutron star masses without affecting the properties of nuclear matter at normal saturation density. We also analyzed the effect of the same on pure neutron matter and also on the neutron star matter with and without hyperonic core and compared it with the available theoretical, experimental, and observational data. The corresponding tidal deformability (\(\Lambda_{1.4}\)) is also calculated. With the choice of meson-hyperon coupling fixed to hypernuclear potentials, we obtain \(\approx 10~\%\) increase in mass by employing the \(\sigma\)-cut potential for \(f_{s} = 0.6\). Our results are in good agreement with various experimental constraints and observational data, particularly with the GW170817 data.
We measured the surface tension of linear alkylbenzene (LAB) HYBLENE 113 mixed with Diphenyloxazole (PPO) as well as of pure LAB HYBLENE 113 as part of material studies for the liquid-scintillator ...based surround background tagger (SBT) in the proposed SHiP experiment. The measurement was performed using the iron wire method and the surface tension for linear alkyl benzene HYBLENE 113 plus PPO was found to be \((30.0\pm0.6)\) mN/m \(22.0\pm 0.5\) {\deg}C and for pure HYBLENE 113, \((29.2\pm 0.6)\) mN/m at \(21.0\pm 0.5\) {\deg}C.
