HPGe Analysis

General Overview
This pages is intended as a guide to help users to analyse data from the HPGe array at TAMU.

Calibration
calibration coeff file, resolutions etc..

Efficiency
A simple Monte carlo simulation of two consecutive events hitting the wall of a rectangular box was made to estimate The number of correlated gammas in the cascade of Co-60. The source is placed in the center at (0,0,0) an the events are simply The intersection between the 3D-line of the events and the plane of the detector. The sides of the box represents the planes of detectors and are placed at different positions perpendicular to the cartezian axes:
 * Detector 1 at x = (50+10.5) mm
 * Detector 2 at y = (50+15.3) mm
 * Detector 3 at x = -(50+6.3) mm
 * Detector 4 at y = -(50+11.5) mm

First particle A is generated and then particle B is generated with respect to A following this law of correlation: W(\theta) = 1 +  A22*L2  +  A44*L4; Where,
 * A22 = 0.1005
 * A44 = 0.0094
 * L2 = (1/2)*( 3*cos(\theta)^2 - 1 );   // Legendre polynomial order 2
 * L4 = (1/8)*( 35*cos(\theta)^4 - 30*cos(\theta)^2 + 3 ); // Legendre polynomial order 4

The detector shape is described accurately on the surface of every plane. No other efficiency other than geometrical (such as detection efficiency depending on energy) are taken into account The table below shows the correlation, for 10000000 events emitted.

(Efficiences, defective cores, segments.. etc..)

Hit modes
The hit mode analysis is developed to use the most of the segmentation by using the cores and the segments A mode (#C,#S) is defined by the number of cores hit and the number of segments hit in one event per clover. the possible modes are:


 * (1 core, 1 segment), (1 core, 2 segments)
 * (2 cores, 1 segment), (2 cores, 2 segments), (2 cores, 3 segments)
 * (3 cores, 3 segments), (3 cores, 2 segments)
 * (4 cores, 3 segments)

Each mode has a number of possible tracks that are identifiable by comparing the deposited energies. Then number of tracks is the minimum number of interaction within the clover to produce the observed mode. For each case they are represented in the table below

The idea is to workout out the track (with the minimum hits) using the fired core and segment numbers and there energies for every mode. Once the hits positions are defined, within the 8 possible cells of one clover, they can be used for a better Doppler correction or an Add-back scheme

Doppler Correction
Formula, method used, new resolutions

Add-Back
method, type of add back, new efficiencies