s393/land02 workshop 2011

Results of a photogrametric distance measurement performed with V.Volkov will be presented. This includes detector positions and resolutions obtained, but also a sketch of the measuring method. Furthermore the study of the double-hump structure of the incoming-ToF of nuclei in several A/Z-settings will be discussed as well as the conclusions drawn.

This work presents the analyzing of the run file 480 with a secondary beam 24O at the energy 490 AMeV using the time of flight between S8 and POS detectors. In order to explain the strange structure in the plot charge vs. mass (which appears as column in the middle and at the end of the plot) a script for the charge identification has been written. By switching off one of the...

I aim at presenting the status of the calibration of the incoming detectors and the Silicon strip tracker systems for the s393 experiment.

The current status of the analysis of quasi-free scattering with neutron-deficient carbon isotopes is presented.

α-clustering is well established in light nuclei, both experimentally and in theoretical models such as Anti-Symmetrised Molecular Dynamics. For example 8Be has been well described as two α-particles. These models also predict the possibility of ground state clustering in the neutron-rich beryllium isotopes, however there is a lack of experimental evidence to support this due to the technical...

Within the s393 experiment, a 4pi gamma detector (known as Crystal Ball), consisting of an array of 162 NaI crystals surrounding the reaction target, is used for measuring the gamma rays emitted by the de-exciting fragment after quasifree reactions. During the gamma energy calibration stage of this detector, we performed some changes in the already known scripts used for this matter, due to...

The current algorithms, to perform the addback summation of the gamma interaction depositing energy in several stages and in several adjacent crystals, search for clusters of energy in crystals, using the one found with most energy to make the Doppler correction. The present work aim is to first study and obtain the gamma distribution within the crystal ball. In continuation an improved ...

Three different methods for the efficiency calibration of the gamma branch of the Crystal Ball detector have been automated and tested with the s393/s389 calibration data. The three different methods produce differing results. The causes of the different results have been identified. This leaves one method providing reliable efficiency calibration points at 1.18 MeV and 1.33 MeV for the...

Results of the calibration of the incoming and outgoing heavy ion branch detectors for the experiment s393 will be presented. Open questions that are still remaining for the case of the incoming beam will be shown for discussion. Results for the heavy ions will be displayed focusing in the TFW to crosscheck results. The efficiency evaluation and calibration of Crystal Ball has been started as...

I aim at presenting the current status of the calibration of the detection systems TFW and GFI for experiment s393.

In the s393 experiment, the momentum distribution of the knocked-out protons is of crucial importance. Determination of this distribution in the current setup depends on the trajectory of the protons after the ALADIN magnet. For this reason, two drift chambers are used to measure the position of the knocked-out protons. In this presentation, I will report on the calibration of the drift...

did: 1) calibrations - SST-calibrations using Matthias scripts - LAND & TFW calibrations using Domincs scripts - GFI calibration is still in progress ... 2) fragment mass tracking - used Ralfs tracker with little success - used (modified) reference method with little succes but this i did not finish completely - so far best results with empirical mass reconstruction using...

The workflow of the calibration-reconstruction loop with land02 will be illustrated by the gamma1 and gamma2 programs. The determination of the activity of a calibration gamma source by using random coincidences will be used as particular example.

Cosmic muons offer good possibilities to calibrate various detectors in the LAND-setup. Moreover, using them does neither require time for calibration runs, nor sources, as data can simply be collected off-spill during measurements. With their help the LAND detector timing offset is already calibrated. Using cosmic muons to calibrate the proton branch of the Crystal Ball is possible as shown...