Management control – International Observatory 2014

International audienc

Ultraviolet laser induced fluorescence of human aorta

Laser induced fluorescence from normal human aorta is studied with u.v. excitations of 305 to 310 nm, observing emission from 320 to 500 nm. In this region LIF lineshapes are strongly dependent on the excitation wavelength, suggesting that at least two fluorophores are being observed. The short wavelength fluorophore, peaking at 34Onm, is identified as tryptophan, while the longer wavelength fluorophore, peaking at 387 nm, is associated with collagen and elastin. In addition, fluorescence time decays of each component are measured with a time correlated photon counting system. A four-exponential fit of each decay is necessary to extract fluorescence lifetimes, which range from 33 ps to 8.6 ns

Transverse momentum spectra of charged particles in proton-proton collisions at 1as=900 GeV with ALICE at the LHC

The inclusive charged particle transverse momentum distribution is measured in proton-proton collisions at s=900 GeV at the LHC using the ALICE detector. The measurement is performed in the central pseudorapidity region (|\u3b7|<0.8) over the transverse momentum range 0.15<10 GeV/c. The correlation between transverse momentum and particle multiplicity is also studied. Results are presented for inelastic (INEL) and non-single-diffractive (NSD) events. The average transverse momentum for |\u3b7|<0.8 is \u3008pT\u3009INEL=0.483\ub10.001 (stat.)\ub10.007 (syst.) GeV/c and \u3008pT\u3009NSD=0.489\ub10.001 (stat.)\ub10.007 (syst.) GeV/c, respectively. The data exhibit a slightly larger \u3008pT\u3009 than measurements in wider pseudorapidity intervals. The results are compared to simulations with the Monte Carlo event generators PYTHIA and PHOJET. \ua9 2010