Change search
ReferencesLink to record
Permanent link

Direct link
Fluctuation studies and energy reconstruction in a segmented calorimeter
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
2006 (English)In: 2006 IEEE Nuclear Science Symposium Conference Record, IEEE , 2006, 177-181 p.Conference paper (Refereed)
Abstract [en]

In order to better understand energy estimation of electromagnetic showers in segmented calorimeters, detailed Geant4 simulation studies of electromagnetic showers in the energy range 1-100 GeV in CsI have been performed. When sampled in layers of 1.99 cm thickness, corresponding to 1.08 radiation lengths, the energy fluctuations in the samples show distributions that vary significantly with depth. The energy distributions are similar for incident electrons and photons and were found to change systematically along the shower, varying little with the initial energy. Three probability distributions have been fitted to the data: negative binomial, log-normal and Gaussian distributions, none of which gives a good fit over the full shower length. The obtained parameterizations might be useful in the use of the maximum likelihood method for estimating the energy. Two methods for estimating the energy have also been studied. One method is based on fitting individual longitudinal shower profiles with a G-function, the other one corrects the measured energy for leakage by utilizing the energy deposited in the last layer. Our simulations indicate that the last-layer correction method applied to photons and electrons of 1 and 10 GeV gives about a factor of 2 improvement in the energy resolution.

Place, publisher, year, edition, pages
IEEE , 2006. 177-181 p.
, IEEE Nuclear Science Symposium Conference Record, ISSN 1082-3654
Keyword [en]
multiplicity distributions, electrons, showers, passage, lead
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-39670DOI: 10.1109/NSSMIC.2006.356133ISI: 000288875600036ScopusID: 2-s2.0-38649090707ISBN: 978-1-4244-0561-9OAI: diva2:440213
2006 IEEE Nuclear Science Symposium, Medical Imaging Conference and 15th International Workshop on Room-Temperature Semiconductor X- and Gamma-Ray Detectors, Special Focus Workshops, NSS/MIC/RTSD; San Diego, CA; United States; 29 October 2006 through 4 November 2006

QC 20110912

Available from: 2011-09-12 Created: 2011-09-12 Last updated: 2014-11-06Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Gavler, Sara BergeniusCarlson, PerConrad, Jan
By organisation
PhysicsParticle and Astroparticle Physics
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 21 hits
ReferencesLink to record
Permanent link

Direct link