Status of the Jiangmen Underground Neutrino Observatory

Schever, Michaela

doi:10.15407/ujpe64.7.635

Cited by 2 publications

(4 citation statements)

References 10 publications

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“…Each of the two gamma-rays of a gamma-ray pair enters an imaging module and interacts via multiple Compton scatterings, producing recoil electrons that deposit energy along the recoil tracks. An event simulated using the Kamland-Zen LAB-based scintillator [32] as the medium is superposed to scale.…”

Section: Using Low-z Materials To Measure the Line Of Responsementioning

confidence: 99%

“…These interact with the active detector medium via two processes, Compton scattering [37], and the photoelectric effect. The two process have distinctly different behavior with atomic number (Z) of the target material; when a 511 keV gamma ray first enters a typical low-Z organic scintillator [32] the ratio of the Compton to PE cross-sections is on the order of 10 4 [39].…”

Section: The Gamma Trajectory: Successive Compton Scatteringsmentioning

confidence: 99%

“…We have used Geant4 [40,41] to simulate the successive interactions of 511 keV gamma rays entering a volume containing a typical low-Z organic liquid scintillator, in this case the LAB-based scintillator developed by the Kamland-Zen collaboration [32]. The pattern of ionization produced by the gamma is determined by the kinematics of successive Compton-scatterings, with each scatter producing a gamma of lower energy and a recoil electron in a two-body process fully constrained by conservation of energy and momentum [37,42,43].…”

Section: The Gamma Trajectory: Successive Compton Scatteringsmentioning

confidence: 99%

“…Figure 2 shows the simulated trajectory of a 511 keV gamma ray after entering a volume of LAB-based liquid scintillator [32]. The right-hand panel corresponds to a high-resolution digital-camera image displayed in 1-cm pixels.…”

Section: The Gamma Trajectory: Successive Compton Scatteringsmentioning

confidence: 99%

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Low-Dose High-Resolution TOF-PET Using Ionization-activated Multi-State Low-Z Detector Media

Shida,

Spieglan,

Adams

et al. 2021

Preprint

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We propose PET scanners using low atomic number media that undergo a persistent local change of state along the paths of the Compton recoil electrons. Measurement of the individual scattering locations and angles, deposited energies, and recoil electron directions allows using the kinematical constraints of the 2-body Compton scattering process to perform a statistical time-ordering of the scatterings, with a high probability of precisely identifying where the gamma first interacted in the detector. In these cases the Line-of-Response is measured with high resolution, determined by the underlying physics processes and not the detector segmentation. There are multiple such media that act through different mechanisms. As an example in which the change of state is quantum-mechanical through a change in molecular configuration, rather than thermodynamic, as in a bubble chamber, we present simulations of a two-state photoswitchable organic dye, a 'Switchillator', that is activated to a fluorescent-capable state by the ionization of the recoil electrons. The activated state is persistent, and can be optically excited multiple times to image individual activated molecules. Energy resolution is provided by counting the activated molecules. Location along the LOR is implemented by large-area time-of-flight MCP-PMT photodetectors with single photon time resolution in the tens of ps and sub-mm spatial resolution. Simulations indicate a large reduction of dose.

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Section: Using Low-z Materials To Measure the Line Of Responsementioning

confidence: 99%

Section: The Gamma Trajectory: Successive Compton Scatteringsmentioning

confidence: 99%