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Geant4 Simulation of Ancillary Charge Particle Detector Array for Detection Efficiency Jasmeet Kaur1∗ and R

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Geant4 Simulation of Ancillary Charge Particle Detector Array for Detection Efficiency Jasmeet Kaur1∗ and R Geant4 Simulation of ancillary charge particle detector array for detection efficiency Jasmeet Kaur1∗ and R. Kumar2 1Ferozepur College of Engineering and Technology, Ferozepur, INDIA and 2Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, INDIA Introduction Ancillary charged particle detector arrays has become essential nowadays to support the large gamma-ray spectrometers that may en- able the study of nuclei far from stability val- ley. The exotic nuclei close to the proton drip line can be reached at Inter University Accel- erator Center (IUAC) with the availability of higher energy beam from LINAC using fusion evaporation reaction of nuclei of nearly equal mass. The senitivity for studying these weakly evaporated channels at high spin can be en- hanced by suppressing the competing chan- nels. The incorporation of ancillary detectors like charged particle detector array (CPDA) FIG. 1: Quad CsI Crystals can greatly improve the capabilities of γ-ray detectors. An array consisting of CsI scintilla- tors coupled to a Si-PIN photodiode S3590-08 of upcoming CPDA by reviewing important is under development at IUAC for the detec- aspects of detector geometry using Geometry tion of light charged particles such as protons and Tracking 4 (Geant4), Monte Carlo code and α-particles. The array will be coupled as [2]. an ancillary device to Indian National Gamma Array (INGA), providing the opportunity to Simulation select reaction channels of interest by gating on emitted light charged particles. This will Using Geant4, square shape (60 mm× 60 enable selection or rejection of reaction chan- mm) PCB boards were created and are ar- nels, rejection of random events and will also ranged in Rhombicuboctahedron geometry. enhance gammas [1]. The absolute measure- The CsI crystal having dimension 20 mm × ment of crossections of particles emitted in the 20 mm with 3 mm thickness assembled as nuclear reactions requires the efficiencies of de- quads in 2 × 2 configuration on each PCB. tectors inorder to correct the measured yields. Fig. 1 shows the placement of 4 CsI crystals on Thus, before passing to the real simulations, single PCB where former is called as daugh- we must define the general properties of detec- ter volume and latter is the mother volume. tion system, like efficiency, energy and time Fig. 2 shows arrangement of 18 PCB in rhom- resolution. The present contribution reports bicuboctahedran geometry. preliminary results of alpha particle efficiency A total of 72 crystals are implemented in present simulations, subsequently 8 triangular shape crystals will be added to get efficiency of 4π CPDA. The entire array is designed to ∗Electronic address: [email protected] be housed inside a hollow quasi-spherical alu- lected and analysed event by event using Root FIG. 3: simulated distribution of α− particles libraries[3]. Fig. 3 shows the distribtion of al- FIG. 2: Simulated Rhombicuboctahedron geome- try of CPDA pha particles along x-y-z axes. minium chamber of thickness ∼ 3mm. The chamber has an outer diameter of ∼ 10", so that it can be well placed inside the INGA Simulation Results array. In addition to constructing geometry, The detection efficiency of array for 5.486 various physics processes like electromagnetic MeV α−particles is ≈ 50% with the simu- and hadronic proceses are included in Physics lated array. The efficiency of array is op- List class. These processes can occur when timized by varying different geometrical pa- the particles travel through the detector ma- 241 rametes of array. The next step is to esti- terials. The radioactive source, Am is mod- mate the full efficiency of array including tri- eled as general particle source and set to emit angle detectors and after accomplishing this decaying particles isotropically by implement- objective we will move to the real simula- ing standard G4 radioactive decay model. The tions for different charged particles by imple- source is placed at the center of array and menting fusion-evaporation reactions in simu- source to PCB distance is approximately 6 cm. lations and also to evaluate the transparency The efficiency of simulations is increased by of array to gamma rays. The results of simula- implementing G4UserStacking Action in such tions can be further verified by experimentally a way that secondary ions from the decay are measuring efficiency of array using different not further treated and the decay is inter- monoenergetic charge particle beams. rupted for daughter nucleus Np237. The simulation output consisted of the to- tal energy per event deposited in the sensi- References tive detector CsI volume, the energy deposited [1] D.G. Sarantites et al: Nucl.Instum.M A, by alpha, electrons and gammas. The more 381, 485 (1996). detailed output includes information about [2] S. Agostinelliet al. Nucl. Instrum. Meth- all processes, particles involved and their ge- ods Phys. Res. A 506 250-303 (2003). ometrical origin. The main processes in [3] R. Brun and F. Rademakers Nucl. In- which alpha particles lose energy are excita- strum. Methods Phys. Res. A 389 6-81 tion and ionization. The information is col- (1997)..
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