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SUMMARY:Development of a novel self-calibration technique for γ-ray energ
 y-tracking arrays
DTSTART;VALUE=DATE-TIME:20231202T122500Z
DTEND;VALUE=DATE-TIME:20231202T124000Z
DTSTAMP;VALUE=DATE-TIME:20260715T231928Z
UID:indico-contribution-3400@indico.tlabs.ac.za
DESCRIPTION:Speakers: Michael Bentley (University of York)\nThe developmen
 t of $\\gamma$-ray energy-tracking arrays using highly segmented High Puri
 ty Germanium (HPGe) detectors is currently the technological frontier of h
 igh-resolution gamma-ray spectroscopy in modern nuclear physics [1]. The t
 racking capability of such arrays strongly depends on the performance of t
 he Pulse Shape Analysis (PSA)\, which uses the position-dependent response
  of the detector signals to determine the $\\gamma$-ray interaction positi
 ons within the detector volume. The PSA algorithm is performed by comparin
 g the measured signal pulse shape to expected pulse shapes associated with
  different interaction positions – i.e. the “signal basis”. Therefor
 e\, producing a reliable signal basis is one of the key points for PSA.\n\
 nA novel method to generate a reliable signal basis in a notably simple ex
 perimental way was proposed in [2]\, and this presentation reports on the 
 testing and implementation of this method. In this method\, a $\\gamma$-ra
 y source illuminates the full array and the Compton scattering data is obt
 ained. Starting with the assumption of a segment-sized position resolution
  for every interaction point and using an iterative minimization procedure
  based on the tracking of Compton scattering events\, it is possible to co
 nverge to the real positions after several iterations\, which is the so-ca
 lled “self-calibration” approach. Heil *et al.* [2] demonstrated the f
 easibility of the approach using a simulation\, applied a simplified geome
 try for a generic array and without considering electronic pulses.\n\nThis
  presentation reports the new development of the self-calibration techniqu
 e with a realistic geometry for the AGATA array with pulse-shape signals\,
  and the first implementation of the approach using experimental source da
 ta with AGATA at the Legnaro National Laboratory. To demonstrate the perfo
 rmance of this technique\, it is first applied to a simulation data obtain
 ed using the interaction points produced by the AGATA Geant4 simulation pa
 ckage combined with a calculated pulse shape signal basis generated by the
  AGATA Detector Library (ADL)[3]. The signal basis produced by the self-ca
 libration method is compared with the initial ADL basis to show the validi
 ty of the method. This method was then applied to signals from real $\\gam
 ma$-ray source calibration data to generate\, for the first time\, an expe
 rimental in-situ signal basis for AGATA. This experimental self-calibrated
  basis is compared with the currently-used calculated ADL basis. PSA using
  both signal bases have been attempted and the comparison looks very encou
 raging for the new approach. Further development of the self-calibration t
 echnique is proposed and improvements to the experimental basis generated 
 by the self-calibration technique are foreseen in the near future.\n\n[1] 
 A. Korichi\, T. Lauritsen\, Eur. Phys. J. A 55\, 121 (2019).\n[2] S. Heil\
 , S. Paschalis\, M. Petri\, Eur. Phys. J. A 54\, 172 (2018).\n[3] B. Bruyn
 eel\, B. Birkenbach\, P. Reiter\, Eur. Phys. J. A 52\, 70 (2016).\n\nhttps
 ://indico.tlabs.ac.za/event/119/contributions/3400/
LOCATION:
URL:https://indico.tlabs.ac.za/event/119/contributions/3400/
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