A Space-based All-sky MeV gamma-ray Survey with the Electron Tracking Compton Camera

Hamaguchi, Kenji; Tanimori, T.; Takada, Atsushi; Beacom, J. F.; Gunji, Shuichi; Mori, M.; Nakamori, Takeshi; Shrader, C. R.; Smith, David M.; Tamagawa, Toru; Tsurutani, B. T.

doi:10.48550/arxiv.1907.06658

Cited by 4 publications

(6 citation statements)

References 17 publications

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“…For this aim, a gaseous Time Projection Chamber (TPC) was used both as a scatterer and an electron tracking device. In 2018, SMILE observed the Galactic Center and detected the Crab, Galactic diffuse MeV γ-rays, and cosmic diffuse MeV γ-rays with the ETCC [149][150][151]. The SMILE collaboration is currently moving forward with the SMILE-3 experiment that can potentially have five times better sensitivity than COMPTEL with a one-month duration balloon flight.…”

Section: Sub-mev γ-Ray Imaging Loaded-on Balloon Experiments (Smile)mentioning

confidence: 99%

“…4). The ETCC measures all parameters of the Compton kinematic equation, including the energy loss rate (dE/dx) of a recoil electron and the event topology, while providing a Point Spread Function (PSF) to identify the direction of the incident γ-rays with a linear imaging system [150,151]. The SMILE-3 ETCC, consisting of four 50cm-cubes filled with 3 atm CF4 gas, can achieve 2 • of PSF (Scatter Plane Deviation (SPD) = 10 • and Angular Resolution Measure (ARM) = 5 • ), providing a sensitivity of ¡1 m-Crab with a 200 cm 2 effective area in 10 6 s observation time [154].…”

Section: Sub-mev γ-Ray Imaging Loaded-on Balloon Experiments (Smile)mentioning

confidence: 99%

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Snowmass2021 Cosmic Frontier: The landscape of cosmic-ray and high-energy photon probes of particle dark matter

Aramaki¹,

Boezio²,

Buckley³

et al. 2022

Preprint

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This white paper discusses the current landscape and prospects for experiments sensitive to particle dark matter processes producing photons and cosmic rays. Much of the γ-ray sky remains unexplored on a level of sensitivity that would enable the discovery of a dark matter signal. Currently operating GeV-TeV observatories, such as Fermi-LAT, atmospheric Cherenkov telescopes, and water Cherenkov detector arrays continue to target several promising dark matter-rich environments within and beyond the Galaxy. Soon, several new experiments will continue to explore, with increased sensitivity, especially extended targets in the sky. This paper reviews the several near-term and longer-term plans for γray observatories, from MeV energies up to hundreds of TeV. Similarly, the X-ray sky has been and continues to be monitored by decade-old observatories. Upcoming telescopes will further bolster searches and allow new discovery space for lines from, e.g., sterile neutrinos and axion-photon conversion.Furthermore, this overview discusses currently operating cosmic-ray probes and the landscape of future experiments that will clarify existing persistent anomalies in cosmic radiation and spearhead possible new discoveries.Finally, the article closes with a discussion of necessary cross section measurements that need to be conducted at colliders to reduce substantial uncertainties in interpreting photon and cosmic-ray measurements in space.Snowmass2021 Cosmic Frontier: The landscape of cosmic-ray and high-energy photon probes of particle dark matter Snowmass2021 Cosmic Frontier: The landscape of cosmic-ray and high-energy photon probes of particle dark matter

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Section: Sub-mev γ-Ray Imaging Loaded-on Balloon Experiments (Smile)mentioning

confidence: 99%

Section: Sub-mev γ-Ray Imaging Loaded-on Balloon Experiments (Smile)mentioning

confidence: 99%

Snowmass2021 Cosmic Frontier: The landscape of cosmic-ray and high-energy photon probes of particle dark matter

Aramaki¹,

Boezio²,

Buckley³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

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“…20 Observed and expected sensitivities of SMILE-2+ and expected sensitivities of SMILE3 and ETCC-satellite. Adapted from [Hamaguchi et al, 2019;Takada et al, 2022].…”

Section: Analysis For Background Reductionmentioning

confidence: 99%

“…With molecular gases, the needed effective area can be obtained from a 1-m 3 sensitive volume. A proposal of such an ETCC on a satellite mission was submitted to the 2020 NASA Decadal Survey [Hamaguchi et al, 2019].…”

Section: Future Prospectsmentioning

confidence: 99%

Time projection chambers for gamma-ray astronomy

Bernard¹,

Hunter²,

Tanimori³

2022

Preprint

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The detection of photons with energies greater than a few tenths of an MeV, interacting via Compton scattering and/or pair production, faces a number of difficulties. The reconstruction of single-scatter Compton events can only determine the direction of the incoming photon to a cone, or an arc thereof and the angular resolution of pair-conversion telescopes is badly degraded at low energies. Both of these difficulties are partially overcome if the density of the interaction medium is low. Also no precise polarization measurement on a cosmic source has been obtained in that energy range to date. We present the potential of low-density high-precision homogeneous active targets, such as time-projection chambers (TPC) to provide an unambiguous photon direction measurement for Compton events, an angular resolution down to the kinematic limit for pair events, and the polarimetry of linearly polarized radiation.

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“…These days, stimulated by the dawn of multi-messenger astronomy including gravitational wave [3] and neutrino observations [4], this curtained window of electromagnetic waves is drawing increasing attention. Towards high-sensitivity observations in the 2020s or 2030s, several MeV gamma-ray missions have been proposed at this moment (GRAMS [5], AMEGO [6], e-ASTROGAM [7], COSI [8], SMILE [9] e.t.c. ).…”

Section: Introductionmentioning

confidence: 99%

Reconstruction of multiple Compton scattering events in MeV gamma-rayCompton telescopes using a physics-based probabilistic model

Yoneda¹,

Odaka²,

Ichinohe³

et al. 2021

Preprint

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Aimed at progress in MeV gamma-ray astronomy which has not yet been well-explored, Compton telescope missions with a variety of detector concepts have been proposed so far. One of the key techniques for these future missions is an event reconstruction algorithm that is able to determine the scattering orders of multiple Compton scattering events and to identify events in which gamma rays escape from the detectors before they deposit all of their energies. We propose a new algorithm that can identify whether the gamma rays escape from the detectors or not, in addition to the scattering order determination. This algorithm also corrects incoming gamma-ray energies for escape events. The developed algorithm is based on the maximum likelihood method, and we present a general formalism of likelihood functions describing physical interactions inside the detector. We also introduce several approximations in the calculation of the likelihood functions for efficient computation. For validation, we have applied the algorithm to simulation data of a Compton telescope using a liquid argon time projection chamber, which is a new type of Compton telescope proposed for the GRAMS mission, and have confirmed that it works successfully for up to 8-hit events. The proposed algorithm can be used for next-generation MeV gamma-ray missions featured by large-volume detectors, e.g., GRAMS and AMEGO.

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A Space-based All-sky MeV gamma-ray Survey with the Electron Tracking Compton Camera

Cited by 4 publications

References 17 publications

Snowmass2021 Cosmic Frontier: The landscape of cosmic-ray and high-energy photon probes of particle dark matter

Snowmass2021 Cosmic Frontier: The landscape of cosmic-ray and high-energy photon probes of particle dark matter

Time projection chambers for gamma-ray astronomy

Reconstruction of multiple Compton scattering events in MeV gamma-rayCompton telescopes using a physics-based probabilistic model

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