1,721,722 research outputs found
ALICE silicon tracker alignment and performance
No full textThe Inner Tracking System (ITS) is the detector of the ALICE central barrel located closest
to the beam axis and it is therefore a key detector for tracking and vertexing performance.
It consists of six cylindrical layers of silicon detectors with three different technologies:
two layers each of pixel, drift and strip detectors. We present here the results obtained for
the ITS alignment using charged tracks from cosmic rays and the first pp collision data,
including the validation of survey measurements, the analysis of the track-to-track and
point-to-track residuals as a tool for determining the residual misalignment and monitoring
the global alignment of the system. A first look at the track impact parameter resolution
extracted from the data is also presented
Study of the ALICE performance for the measurement of beauty via the electron decay channel
No full textWe present a strategy for the detection of electrons coming from the semi-electronic decay of
beauty particles generated in Pb–Pb and p–p collisions at LHC using the ALICE detector. The
experiment’s performance for this measurement is evaluated in terms of accessible pt range and
expected uncertainties
Open Heavy Flavour Detection in ALICE
No full textThe start of the operation of the Large Hadron Collider (LHC), scheduled for next year, will open a new chapter
for heavy-ion physics. An important new aspect at the LHC, with respect to the existing accelerators, will be the
abundant production of heavy quarks, that are expected to be a key probe of the strongly interacting medium
produced in the collision. We present results on the expected experimental capability for the measurement of
heavy
avour production in the central barrel of ALICE, the dedicated heavy-ion experiment at the LHC
Charged particles in coincidence with superdeformed states: A test of the compound nucleus decay at large angular momenta
No full textThe reaction 37Cl+120Sn at 187 MeV bombarding energy has been investigated in a coincidence experiment between charged particles and γ-rays at the GASP spectrometer. The population of the superdeformed (SD) band of 152Dy has been studied in the p4n and d3n channels. Alpha particle spectra in coincidence both with normal deformed (ND) and SD bands of 150Tb have been measured. A clear difference is observed between the two spectra, that in coincidence with the SD states being shifted to lower energies. This effect is understood in terms of different angular momentum regions from which the ND and SD states originate. The standard statistical model fails to describe the angular momentum dependence of the alpha particle energies. The use of statistical model in the region where the fission-evaporation competition is strongly affected by dynamical effects is discussed
Comparison of cosmic-ray neutron sensing and gamma-ray spectrometry for non-invasive soil moisture estimation over a large cropped field
No full textSoil moisture is a key variable for supporting agriculture and forest management. This variable, however, shows strong variability in space and time and its correct quantification is still difficult in many practical applications. In the present study we compare two innovative non-invasive sensors developed for the estimation of soil moisture over large area. The first one is a new sensor based on cosmic-ray neutron sensing approach. The second one is a new gamma-ray spectrometer specifically designed for this type of application. Data have been collected at a large, cropped field at Ceregnano, Italy in 2021. The results show that both sensors well capture the local hydrological conditions, and they can be considered reliable methods for soil moisture estimations. In both sensors, however, the signal shows to also be sensitive even if to a different degree to water in the biomass, highlighting the need of corrections when fast plant growth is expected
Performances of a large are scanning system for elemental analysis with tagged 14 MaV neutron beams
No full textPreparation for the alignment of the ALICE inner tracking system
No full textTracking detectors in high-energy physics experiments require an accurate determination of a large number of alignment parameters in order to allow a precise reconstruction of tracks and vertices. In addition to the initial optical survey, the use of tracks in a special software alignment is essential. The methods in use for the alignment of the ALICE Inner Tracking System are presented, starting from residual-based procedure to fitting systems with many thousands of parameters. The two methods are reviewed and the preliminary results showed
Perspectives for the measurement of beauty production cross section at LHC with ALICE
No full textWe present a performance study for the detection of open beauty hadrons decaying in the semi-electronic channels in Pb-Pb collisions at the LHC with the ALICE detector
Measuring beauty production in Pb-Pb collisions at the LHC via single electrons in ALICE
No full textWe present the expected ALICE performance for the measurement of the p_t-differential cross section of electrons from beauty decays in central Pb-Pb collisions at the LHC.We present the expected ALICE performance for the measurement of the p_t-differential cross section of electrons from beauty decays in central Pb-Pb collisions at the LHC.We present the expected ALICE performance for the measurement of the p_t-differential cross section of electrons from beauty decays in central Pb-Pb collisions at the LHC.We present the expected ALICE performance for the measurement of the p_t-differential cross section of electrons from beauty decays in central Pb-Pb collisions at the LHC.We present the expected ALICE performance for the measurement of the p_t-differential cross section of electrons from beauty decays in central Pb-Pb collisions at the LHC
Monte Carlo analysis of tagged neutron beams for cargo container inspection
No full textFast neutrons produced via D + T reactions and tagged by the associated particle technique have been recently proposed to inspect cargo containers. The general characteristics of this technique are studied with Monte Carlo simulations by determining the properties of the tagged neutron beams as a function of the relevant design parameters (energy and size of the deuteron beam, geometry of the charged particle detector). Results from simulations, validated by experiments, show that the broadening of the correlation between the a-particle and the neutron, induced by kinematical as well as geometrical (beam and detector size) effects, is important and limits the dimension of the minimum voxel to be inspected. Moreover, the effect of the container filling is explored. The material filling produces a sizeable loss of correlation between a-particles and neutrons due to scattering and absorption. Conditions in inspecting cargo containers are discussed
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