Differential Cross Section Measurements in Ion-molecule Collisions
نویسنده
چکیده
A 14 m long beam line dedicated to study very small scattering angles in ion-molecule collisions has been set up in the University of Toledo Heavy Ion Accelerator (THIA) Laboratory. Together with position sensitive detectors for both the projectile and the recoil particles’ detection, the beam line can be used to measure the projectile forward scattering angles of up to 2.5 milliradians (mrad) with a 0.025 mrad resolution, in coincidence with information on the recoil particles such as recoil charge states, energy, momentum and the molecular orientations.
منابع مشابه
Excitation of 2 1S, 2 1P and 3 1P, 3 3P levels of helium in He+ on He collisions at a few hundreds eV
2014 The excitations of Helium on 2 1S, 2 1P and 3 1P, 3 3P levels in He+ on He collisions at low energy are investigated experimentally. The data are interpreted in the frame of a semi-diabatic description of He+2 , using a semi-classical treatment of the collision. 2 1P differential cross sections at 100 and 150 eV (Lab) and angular ion-photon correlation functions at 100 eV (Lab) and laborat...
متن کاملGas molecule scattering & ion mobility measurements for organic macro-ions in He versus N2 environments.
A pending issue in linking ion mobility measurements to ion structures is that the collisional cross section (CCS, the measured structural parameter in ion mobility spectrometry) of an ion is strongly dependent upon the manner in which gas molecules effectively impinge on and are reemitted from ion surfaces (when modeling ions as fixed structures). To directly examine the gas molecule impingeme...
متن کاملHeavy Ion Collisions by STAR
We present the first measurement of reconstructed jets in ultra-relativistic heavy ion collisions. Utilizing the large coverage of the STAR Time Projection Chamber and Electromagnetic Calorimeter, we apply several modern jet reconstruction algorithms and background subtraction techniques and explore their systematic uncertainties in heavy ion events. The differential spectrum for inclusive jet ...
متن کاملJet Reconstruction in Heavy Ion Collisions
Measurements of strong suppression of inclusive hadron distributions and di-hadron correlations at high pT , while providing evidence for partonic energy loss, also suffer from geometric biases due to the competition of energy loss and fragmentation. The measurements of fully reconstructed jets is expected to lack these biases as the energy flow is measured independently of the fragmentation de...
متن کاملElliptic Flow from Minijet Production in Heavy Ion Collisions
We calculate the contribution to the elliptic flow observable v2 from two–particle correlations in minijet production in ultrarelativistic heavy ion collisions. We use a minijet production cross section derived in a model inspired by saturation approach to high energy scattering. Resulting differential elliptic flow v2(pT ) is an increasing function of pT for transverse momenta below the satura...
متن کامل