Exploitable results Measurement of nucleon structure in low x kinematic region at the HERA collider The first stage of the project was to build and install a calorimeter in order to upgrade the backward part of the H1 detector at the HERA collider. The calorimeter SPACAL type was installed in the beginning of 1995, and during the period 1995-1997 a lot of data was taken with the new apparatus. The objectives of the second stage were: -.to build, test, and install a small backward plug calorimeter (BPLUG) in the rear part of H1 detector, -.to calibrate the SPACAL calorimeter, and -.to obtain and analyze the physical information on the deep inelastic electron-proton scattering using the SPACAL calorimeter. The BPLUG calorimeter was built, tested, installed and calibrated in the working conditions. H1 current data taking with the BPLUG is in progress. The precision of the calibration is about 20%. The SPACAL calorimeter was calibrated using cosmic muons, HERA halo muons and ep kinematic peak reactions. The different methods give the comparable results. A lot of physics data is accumulated with the SPACAL calorimeter as a part of the H1 detector. The most important result is the measurement of the proton structure function F2(x, Q2) and the virtual photon-photon cross section for momentum transfers squared Q2 between 0.35 GeV2 and 3.5 GeV2 and for Bjorken - x values down to 6 . 10-6. The data represent an increase in kinematic reach to lower x and Q2 values of about a factor of 5 compared to previous measurements. The rise of F2 with decreasing x is found to be less steep for the lowest Q2 values measured. Searching for OpenAIRE data... There was an error trying to search data from OpenAIRE No results available
