Positron identification study with the PAMELA calorimeter
2011 (English)In: Proceedings of ICRC2011, Beijing: ICRC , 2011, 31-34 p.Conference paper (Refereed)
PAMELA is a satellite-borne experiment which is taking data since 2006. It consists of a permanent magnetic spectrometer, an electromagnetic calorimeter, a time-of-flight system, a neutron detector and an anticoincidence system.
Positrons are a probe of the local galactic environment, allowing secondary production and propagation models to be tested. Exotic processes such as dark matter particle annihilations may also produce an excess of positrons at high energies. Combining information from different detectors and in particular from the calorimeter, positrons can be identified from the overwhelming proton background. The anomalous positron fraction measured by the PAMELA Collaboration in 2009  covers an energy range up to 100 GeV. A new approach for positron identification is described, based on a combination of shower profile variables in the calorimeter, with the aim of extending the positron fraction analysis up to 300 GeV.
Place, publisher, year, edition, pages
Beijing: ICRC , 2011. 31-34 p.
Cosmic rays, positrons
IdentifiersURN: urn:nbn:se:kth:diva-79936ScopusID: 2-s2.0-84899563130OAI: oai:DiVA.org:kth-79936DiVA: diva2:495967
32ND INTERNATIONAL COSMIC RAY CONFERENCE, BEIJING 2011
The conference proceeding has been written on behalf of the PAMELA Collaboration.
QC 201202162012-02-162012-02-092012-02-16Bibliographically approved