A feasibility study of ortho-positronium decays measurement with the J-PET scanner based on plastic scintillators

被引：70

作者：

Kaminska, D. ^{[1
]}

Gajos, A. ^{[1
]}

Czerwinski, E. ^{[1
]}

Alfs, D. ^{[1
]}

Bednarski, T. ^{[1
]}

Bialas, P. ^{[1
]}

Curceanu, C. ^{[2
]}

Dulski, K. ^{[1
]}

Glowacz, B. ^{[1
]}

Gupta-Sharma, N. ^{[1
]}

Gorgol, M. ^{[4
]}

Hiesmayr, B. C. ^{[3
]}

Jasinska, B. ^{[4
]}

Korcyl, G. ^{[1
]}

Kowalski, P. ^{[5
]}

Krzemien, W. ^{[6
]}

Krawczyk, N. ^{[1
]}

Kubicz, E. ^{[1
]}

Mohammed, M. ^{[1
]}

Niedzwiecki, Sz. ^{[1
]}

Pawlik-Niedzwiecka, M. ^{[1
]}

Raczynski, L. ^{[5
]}

Rudy, Z. ^{[1
]}

Silarski, M. ^{[2
]}

Wieczorek, A. ^{[1
]}

Wislicki, W. ^{[5
]}

Zgardzinska, B. ^{[4
]}

Zielinski, M. ^{[1
]}

Moskal, P. ^{[1
]}

机构：

[1] Jagiellonian Univ, Fac Phys Astron & Appl Comp Sci, S Lojasiewicza 11, PL-30348 Krakow, Poland

[2] Ist Nazl Fis Nucl, Lab Nazl Frascati, CP 13,Via E Fermi 40, I-00044 Frascati, Italy

[3] Univ Vienna, Fac Phys, Boltzmanngasse 5, A-1090 Vienna, Austria

[4] Marie Curie Sklodowska Univ, Dept Nucl Methods, Inst Phys, Pl M Curie Sklodowskiej 1, PL-20031 Lublin, Poland

[5] Natl Ctr Nucl Res, Swierk Comp Ctr, PL-05400 Otwock, Poland

[6] Natl Ctr Nucl Res, High Energy Dept, PL-05400 Otwock, Poland

来源：

EUROPEAN PHYSICAL JOURNAL C | 2016年 / 76卷 / 08期

基金：

奥地利科学基金会;

关键词：

PRECISION-MEASUREMENT; EMISSION-TOMOGRAPHY; ANNIHILATION; RECONSTRUCTION; SIGNALS; PERFORMANCE; VIOLATION; SYMMETRY; DETECTOR; SEARCH;

D O I：

10.1140/epjc/s10052-016-4294-3

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We present a study of the application of the Jagiellonian positron emission tomograph (J-PET) for the registration of gamma quanta from decays of orthopositronium (o-Ps). The J-PET is the first positron emission tomography scanner based on organic scintillators in contrast to all current PET scanners based on inorganic crystals. Monte Carlo simulations show that the J-PET as an axially symmetric and high acceptance scanner can be used as a multi-purpose detector well suited to pursue research including e.g. tests of discrete symmetries in decays of orthopositronium in addition to the medical imaging. The gamma quanta originating from o-Ps decay interact in the plastic scintillators predominantly via the Compton effect, making the direct measurement of their energy impossible. Nevertheless, it is shown in this paper that the J-PET scanner will enable studies of the o-Ps -> 3 gamma decays with angular and energy resolution equal to sigma(theta) approximate to 0.4 degrees and sigma(E) approximate to 4.1keV, respectively. An order of magnitude shorter decay time of signals from plastic scintillators with respect to the inorganic crystals results not only in better timing properties crucial for the reduction of physical and instrumental background, but also suppresses significantly the pile-ups, thus enabling compensation of the lower efficiency of the plastic scintillators by performing measurements with higher positron source activities.

引用

页数：14

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