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SUMMARY:Measurement of angular correlations in gamma-gamma cascades using 
 coincidence detection and Monte Carlo simulation
DTSTART;VALUE=DATE-TIME:20260520T105500Z
DTEND;VALUE=DATE-TIME:20260520T111500Z
DTSTAMP;VALUE=DATE-TIME:20260624T082600Z
UID:indico-contribution-3820@indico.tlabs.ac.za
DESCRIPTION:Speakers: Mikayla Chaplin ()\nCoincidence counting techniques 
 are widely used to determine correlated γ-ray emissions from nuclear deca
 ys. Measured singles and coincidence rates share common factors - i.e. abs
 olute efficiency - that can be divided out in analysis. However\, standard
  formulations often assume perfect isotropic correlation between emitted q
 uanta\, neglecting possible decay chain losses\, and ignore angular correl
 ations. In this work\, we use coincidence-based absolute activity measurem
 ents to show that the angular correlation function\, W (θ)\, modulates th
 e detection probability of cascade pairs. Using 60Co and 22Na as benchmark
  sources with differing cascade and correlation properties\, we demonstrat
 e that the true coincidence rate reflects detector efficiencies and angula
 r correlations\, which can be extracted from the observed measurands.\nA c
 ustom FLUKA Monte Carlo source routine was developed to implement angular 
 distributions in γ − γ correlations to support these observations. A P
 ython proof-of-concept generated the normalised cumulative distribution fu
 nctions of W (θ)\, which were incorporated into FLUKA for multi-detector 
 simulations. The Monte Carlo results successfully reproduce the experiment
 ally observed angular modulation\, confirming that coincidence counting co
 mbined with a tailored simulation framework can probe angular correlations
 .\nOur approach forms the groundwork for future studies of more complex de
 cay schemes with non-trivial cascade probabilities and for developing mult
 i-detector techniques for angular-correlation metrology.\n\nhttps://indico
 .tlabs.ac.za/event/139/contributions/3820/
LOCATION:NRF-iThemba LABS\, Old Faure Road\, Cape Town Auditorium
URL:https://indico.tlabs.ac.za/event/139/contributions/3820/
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