EXP2003 » EXP2003: Express analysis

We checked if the double dE-E line on ID plot reported in task 453 was not caused by issues related to calibration. We consider the calibration parameters for the first layer as good enough for purposes of express-analysis. We checked the influence of different amplification coefficients by individual projections for particular Y-strips to the overall dE-E plot for all strips. We do not see any significant shifts caused by the lack of the calibration of Y-strips which may pronounce a double-line in Z=3 region.

Check of the relative position of dE-E hyperbolae for different Y-strips. Black dots - identification plots for all strips. This graph is the same on all panels and data are identical to those reported in task 453. Red dots - identification plot for a particular strip. We observe that ⁴He and ⁸He locus almost keep its position independently on Y-strip number.

An attempt to find some relative calibration parameters for Y-strips was unsuccessful. The amplification coefficients are so near to each other that we did not find any possibility to enhance an overall identification plot. It is demonstrated below on the first 8 Y-strips.

Demonstration of possible preliminary calibration. Colored histogram - ID plot for particular Y-strips whereas the dE was taken from any X-strip. The red markers represent points on ⁸He hyperbola and are the same for all strips. The position of the hyperbola is almost the same for all strips, the penetration of ⁸He is pronounced not enough to make any corrections for Y-strips calibration parameters.