The electron-hadron separation performance of the PAMELA electromagnetic calorimeter

被引：24

作者：

Boezio, M.

Pearce, M. ^{[1
]}

Albi, M.

Bonvicini, V.

Lund, J.

Lundquist, J.

Mocchiutti, E.

Vacchi, A.

Zampa, G.

Zampa, N.

机构：

[1] Univ Stockholm, Albanova Ctr, Royal Inst Technol, KTH,Dept Phys, S-10691 Stockholm, Sweden

[2] Ist Nazl Fis Nucl, Sez Trieste, I-34012 Trieste, Italy

[3] Univ Trieste, Dipartimento Astron, I-34131 Trieste, Italy

来源：

ASTROPARTICLE PHYSICS | 2006年 / 26卷 / 02期

关键词：

PAMELA; cosmic rays; silicon-tungsten calorimeter; electron; hadron;

D O I：

10.1016/j.astropartphys.2006.05.005

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A silicon-tungsten sampling imaging calorimeter has been designed and built for the PAMELA satellite-borne experiment. The main physics goals of the experiment are the measurement of the flux of antiprotons (80 MeV-190 GeV) and positrons (50 MeV-270 GeV) in the cosmic radiation. The calorimeter has been designed to identify antiprotons from an electron background and positrons in a background of protons with a high efficiency and rejection power. This work presents the electron-hadron separation capabilities of the calorimeter as obtained using both Monte Carlo and test beam data. The calorimeter is found to have sufficient performance to reach the primary scientific objectives of PAMELA, providing a proton rejection factor of similar to 10(5) while keeping a similar to 90% efficiency in selecting electrons and positrons. From simulations, an electron rejection factor of similar to 10(5) in antiproton measurements (similar to 90% antiproton identification efficiency) is demonstrated. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：111 / 118

页数：8

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