arXiv subjects

LVD Collaboration

Publications and source records attributed to LVD Collaboration.

5 recordsLinked to original sources

arXiv2002

Study of single muons with the Large Volume Detector at Gran Sasso Laboratory

The present study is based on the sample of about 3 mln single muons observed by LVD at underground Gran Sasso Laboratory during 36500 live hours from June 1992 to February 1998. We have measured the muon intensity at slant depths from 3 km w.e. to 20 km w.e. Most events are high energy downward muons produced by meson decay in the atmosphere. The analysis of these muons has revealed the power index of pion and kaon spectrum: 2.76 \pm 0.05. The reminders are horizontal muons produced by the neutrino interactions in the rock surrounding LVD. The value of this flux is obtained. The results are compared with Monte Carlo simulations and the world data.

hep-ex↗

arXiv2000

Upper limits to low energy antineutrino flux from GRB990705

The detection of Gamma Ray Burst GRB990705 on 1999, July 5.66765 UT, pointing to the Large Magellanic Clouds, suggested the search for a possible neutrino counterpart, both in coincidence with and slightly before (or after) the photon burst. We exploited such a possibility by means of the LVD neutrino telescope (National Gran Sasso Laboratory, Italy), which has the capability to study low-energy cosmic neutrinos. No evidence for any neutrino signal, over a wide range of time durations, has been found, at the occurrence of GRB990705. Due to the lack of information about both the source distance and its emission spectrum, the results of the search are expressed in terms of upper limits, at the Earth, to the antineutrino flux $\cdot$ cross-section, integrated over different time durations. Moreover, assuming thermal antineutrino spectra at the source, upper limits to the antineutrino flux, integrated over time duration, for different spectral temperatures, are obtained. Based on these limits and on the expectations for neutrino emission from collapsing astrophysical objects, the occurrence of a gravitational stellar collapse can be excluded up to a distance r approximately 50 kpc, in the case of time coincidence with GRB990705, and r approximately 20 kpc, for the 24 hours preceding it.

astro-ph↗

arXiv1999

Upper Limit on the Prompt Muon Flux Derived from the LVD Underground Experiment

We present the analysis of the muon events with all muon multiplicities collected during 21804 hours of operation of the first LVD tower. The measured depth-angular distribution of muon intensities has been used to obtain the normalization factor, A, the power index, gamma, of the primary all-nucleon spectrum and the ratio, R_c, of prompt muon flux to that of pi-mesons - the main parameters which determine the spectrum of cosmic ray muons at the sea level. The value of gamma = 2.77 +/- 0.05 (68% C.L.) and R_c < 2.0 x 10^-3 (95% C.L.) have been obtained. The upper limit to the prompt muon flux favours the models of charm production based on QGSM and the dual parton model.

hep-ex↗

arXiv1999

Measurement of the Neutron Flux Produced by Cosmic-Ray Muons with LVD at Gran Sasso

The flux of muon-produced neutrons far away from the muon track may constitute a background for the underground detectors searching for rare events. The muon events collected by the first LVD tower from March, 1996, to February, 1998, (1.56 years of live time) were used to estimate the neutron flux at various distances from the muon track or muon-produced cascade.

hep-ex↗

arXiv1999

Muon Astronomy with LVD Detector

We analysed the arrival directions of single muons detected by the first LVD tower from November, 1994 till January, 1998. The moon shadowing effect has been observed. To search for point sources of high energy photons we have analysed muons crossing the rock thickness greater than 3, 5 and 7 km w.e., which corresponds to the mean muon energies 1.6, 3.9 and 8.4 TeV at the surface, respectively. Upper limits on steady muon fluxes for selected astrophysical sources for different muon energies are presented.

hep-ex↗