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28 results on '"Gerrity, C."'

1. GAPS contributions to the 38th International Cosmic Ray Conference (Nagoya 2023)

Author

Aramaki, T., Boezio, M., Boggs, S. E., Bonvicini, V., Bridges, G., Campana, D., Craig, W. W., von Doetinchem, P., Everson, E., Fabris, L., Feldman, S., Fuke, H., Gahbauer, F., Gerrity, C., Ghislotti, L., Hailey, C. J., Hayashi, T., Kawachi, A., Kozai, M., Lazzaroni, P., Law, M., Lenni, A., Lowell, A., Manghisoni, M., Marcelli, N., Mizukoshi, K., Mocchiutti, E., Mochizuki, B., Mognet, S. A. I., Munakata, K., Munini, R., Okazaki, S., Olson, J., Ong, R. A., Osteria, G., Perez, K., Perfetto, F., Quinn, S., Re, V., Riceputi, E., Roach, B., Rogers, F., Ryan, J. L., Saffold, N., Scotti, V., Shimizu, Y., Shutt, K., Sparvoli, R., Stoessl, A., Tiberio, A., Vannuccini, E., Xiao, M., Yamatani, M., Yee, K., Yoshida, T., Zampa, G., Zeng, J., and Zweerink, J.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

Compilation of papers presented by the GAPS Collaboration at the 38th International Cosmic Ray Conference (ICRC), held July 26 through August 3, 2023 in Nagoya, Japan.

Published
2023

2. The antinucleus annihilation reconstruction algorithm of the GAPS experiment

Author

Munini, R., Vannuccini, E., Boezio, M., von Doetinchem, P., Gerrity, C., Lenni, A., Marcelli, N., Quinn, S., Rogers, F., Ryan, J. L., Stoessl, A., Xiao, M., Saffold, N., Tiberio, A., and Yamatani, M.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract

The General AntiParticle Spectrometer (GAPS) is an Antarctic balloon-borne detector designed to measure low-energy cosmic antinuclei (< 0.25 GeV/n), with a specific focus on antideuterons, as a distinctive signal from dark matter annihilation or decay in the Galactic halo. The instrument consists of a tracker, made up of ten planes of lithium-drifted Silicon Si(Li) detectors, surrounded by a plastic scintillator Time-of-Flight system. GAPS uses a novel particle identification method based on exotic atom capture and decay with the emission of pions, protons, and atomic X-rays from a common annihilation vertex. An important ingredient for the antinuclei identification is the reconstruction of the "annihilation star" topology. A custom antinucleus annihilation reconstruction algorithm, called the "star-finding" algorithm, was developed to reconstruct the annihilation star fully, determining the annihilation vertex position and reconstructing the tracks of the primary and secondary charged particles. The reconstruction algorithm and its performances were studied on simulated data obtained with the Geant4-based GAPS simulation software, which fully reproduced the detector geometry. This custom algorithm was found to have better performance in the vertex resolution and reconstruction efficiency compared with a standard Hough-3D algorithm.

Published
2021
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3. Cosmic antihelium-3 nuclei sensitivity of the GAPS experiment

Author

Saffold, N., Aramaki, T., Bird, R., Boezio, M., Boggs, S. E., Bonvicini, V., Campana, D., Craig, W. W., von Doetinchem, P., Everson, E., Fabris, L., Fuke, H., Gahbauer, F., Garcia, I., Gerrity, C., Hailey, C. J., Hayashi, T., Kato, C., Kawachi, A., Kobayashi, S., Kozai, M., Lenni, A., Lowell, A., Manghisoni, M., Marcelli, N., Mognet, S. I., Munakata, K., Munini, R., Nakagami, Y., Olson, J., Ong, R. A., Osteria, G., Perez, K., Pope, I., Quinn, S., Re, V., Reed, M., Riceputi, E., Roach, B., Rogers, F., Ryan, J. L., Scotti, V., Shimizu, Y., Sonzogni, M., Sparvoli, R., Stoessl, A., Tiberio, A., Vannuccini, E., Wada, T., Xiao, M., Yamatani, M., Yoshida, A., Yoshida, T., Zampa, G., and Zweerink, J.

Subjects
High Energy Physics - Phenomenology, Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Experiment
Abstract

The General Antiparticle Spectrometer (GAPS) is an Antarctic balloon experiment designed for low-energy (0.1$-$0.3 GeV/$n$) cosmic antinuclei as signatures of dark matter annihilation or decay. GAPS is optimized to detect low-energy antideuterons, as well as to provide unprecedented sensitivity to low-energy antiprotons and antihelium nuclei. The novel GAPS antiparticle detection technique, based on the formation, decay, and annihilation of exotic atoms, provides greater identification power for these low-energy antinuclei than previous magnetic spectrometer experiments. This work reports the sensitivity of GAPS to detect antihelium-3 nuclei, based on full instrument simulation, event reconstruction, and realistic atmospheric influence simulations. The report of antihelium nuclei candidate events by AMS-02 has generated considerable interest in antihelium nuclei as probes of dark matter and other beyond the Standard Model theories. GAPS is in a unique position to detect or set upper limits on the cosmic antihelium nuclei flux in an energy range that is essentially free of astrophysical background. In three 35-day long-duration balloon flights, GAPS will be sensitive to an antihelium flux on the level of $1.3^{+4.5}_{-1.2}\cdot 10^{-6}\mathrm{m^{-2}sr^{-1}s^{-1}}(\mathrm{GeV}/n)^{-1}$ (95% confidence level) in the energy range of 0.11$-$0.3 GeV/$n$, opening a new window on rare cosmic physics., Comment: Accepted for publication at Astroparticle Physics, 13 pages, 5 figures

Published
2020
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4. Cosmic-ray Antinuclei as Messengers of New Physics: Status and Outlook for the New Decade

Author

von Doetinchem, P., Perez, K., Aramaki, T., Baker, S., Barwick, S., Bird, R., Boezio, M., Boggs, S. E., Cui, M., Datta, A., Donato, F., Evoli, C., Fabris, L., Fabbietti, L., Bueno, E. Ferronato, Fornengo, N., Fuke, H., Gerrity, C., Coral, D. Gomez, Hailey, C., Hooper, D., Kachelriess, M., Korsmeier, M., Kozai, M., Lea, R., Li, N., Lowell, A., Manghisoni, M., Moskalenko, I. V., Munini, R., Naskret, M., Nelson, T., Ng, K. C. Y., Nozzoli, F., Oliva, A., Ong, R. A., Osteria, G., Pierog, T., Poulin, V., Profumo, S., Poeschl, T., Quinn, S., Re, V., Rogers, F., Ryan, J., Saffold, N., Sakai, K., Salati, P., Schael, S., Serksnyte, L., Shukla, A., Stoessl, A., Tjemsland, J., Vannuccini, E., Vecchi, M., Winkler, M. W., Wright, D., Xiao, M., Xu, W., Yoshida, T., Zampa, G., and Zuccon, P.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

The precise measurement of cosmic-ray antinuclei serves as an important means for identifying the nature of dark matter and other new astrophysical phenomena, and could be used with other cosmic-ray species to understand cosmic-ray production and propagation in the Galaxy. For instance, low-energy antideuterons would provide a "smoking gun" signature of dark matter annihilation or decay, essentially free of astrophysical background. Studies in recent years have emphasized that models for cosmic-ray antideuterons must be considered together with the abundant cosmic antiprotons and any potential observation of antihelium. Therefore, a second dedicated Antideuteron Workshop was organized at UCLA in March 2019, bringing together a community of theorists and experimentalists to review the status of current observations of cosmic-ray antinuclei, the theoretical work towards understanding these signatures, and the potential of upcoming measurements to illuminate ongoing controversies. This review aims to synthesize this recent work and present implications for the upcoming decade of antinuclei observations and searches. This includes discussion of a possible dark matter signature in the AMS-02 antiproton spectrum, the most recent limits from BESS Polar-II on the cosmic antideuteron flux, and reports of candidate antihelium events by AMS-02; recent collider and cosmic-ray measurements relevant for antinuclei production models; the state of cosmic-ray transport models in light of AMS-02 and Voyager data; and the prospects for upcoming experiments, such as GAPS. This provides a roadmap for progress on cosmic antinuclei signatures of dark matter in the coming years., Comment: 45 pages, 14 figures

Published
2020
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5. GAPS: Searching for Dark Matter using Antinuclei in Cosmic Rays

Author

Bird, R., Aramaki, T., Boezio, M., Boggs, S. E., Bonvicini, V., Campana, D., Craig, W. W., Everson, E., Fabris, L., Fuke, H., Gahbauer, F., Garcia, I., Gerrity, C., Hailey, C. J., Hayashi, T., Kato, C., Kawachi, A., Kondo, M., Kozai, M., Lowell, A., Manghisoni, M., Marcelli, N., Martucci, M., Mognet, S. I., Munakata, K., Munini, R., Okazaki, S., Olson, J., Ong, R. A., Osteria, G., Perez, K., Quinn, S., Re, V., Riceputi, E., Rogers, F., Ryan, J. L., Saffold, N., Scotti, V., Shimizu, Y., Sparvoli, R., Stoessl, A., Takeuchi, S., Vannuccini, E., von Doetinchem, P., Wada, T., Xiao, M., Yoshida, A., Yoshida, T., Zampa, G., and Zweerink, J.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

The General Antiparticle Spectrometer (GAPS) will carry out a sensitive dark matter search by measuring low-energy ($\mathrm{E} < 0.25 \mathrm{GeV/nucleon}$) cosmic ray antinuclei. The primary targets are low-energy antideuterons produced in the annihilation or decay of dark matter. At these energies antideuterons from secondary/tertiary interactions are expected to have very low fluxes, significantly below those predicted by well-motivated, beyond the standard model theories. GAPS will also conduct low-energy antiproton and antihelium searches. Combined, these observations will provide a powerful search for dark matter and provide the best observations to date on primordial black hole evaporation on Galactic length scales. The GAPS instrument detects antinuclei using the novel exotic atom technique. It consists of a central tracker with a surrounding time-of-flight (TOF) system. The tracker is a one cubic meter volume containing 10 cm-diameter lithium-drifted silicon (Si(Li)) detectors. The TOF is a plastic scintillator system that will both trigger the Si(Li) tracker and enable better reconstruction of particle tracks. After coming to rest in the tracker, antinuclei will form an excited exotic atom. This will then de-excite via characteristic X-ray transitions before producing a pion/proton star when the antiparticle annihilates with the nucleus. This unique event topology will give GAPS the nearly background-free detection capability required for a rare-event search. Here we present the scientific motivation for the GAPS experiment, its design and its current status as it prepares for flight in the austral summer of 2021-22., Comment: 8 pages, 7 figures, Proc. 36th International Cosmic Ray Conference (ICRC 2019), Madison, USA

Published
2019

6. Sensitivity of the GAPS experiment to low-energy cosmic-ray antiprotons

Author

Rogers, F., Aramaki, T., Boezio, M., Boggs, S.E., Bonvicini, V., Bridges, G., Campana, D., Craig, W.W., von Doetinchem, P., Everson, E., Fabris, L., Feldman, S., Fuke, H., Gahbauer, F., Gerrity, C., Hailey, C.J., Hayashi, T., Kawachi, A., Kozai, M., Lenni, A., Lowell, A., Manghisoni, M., Marcelli, N., Mochizuki, B., Mognet, S.A.I., Munakata, K., Munini, R., Nakagami, Y., Olson, J., Ong, R.A., Osteria, G., Perez, K.M., Quinn, S., Re, V., Riceputi, E., Roach, B., Ryan, J., Saffold, N., Scotti, V., Shimizu, Y., Sparvoli, R., Stoessl, A., Tiberio, A., Vannuccini, E., Wada, T., Xiao, M., Yamatani, M., Yee, K., Yoshida, A., Yoshida, T., Zampa, G., Zeng, J., and Zweerink, J.

Published
2023
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7. Cosmic-ray antinuclei as messengers of new physics: status and outlook for the new decade.

Author

von Doetinchem, P, Perez, K, Aramaki, T, Baker, S, Barwick, S, Bird, R, Boezio, M, Boggs, SE, Cui, M, Datta, A, Donato, F, Evoli, C, Fabris, L, Fabbietti, L, Ferronato Bueno, E, Fornengo, N, Fuke, H, Gerrity, C, Gomez Coral, D, Hailey, C, Hooper, D, Kachelriess, M, Korsmeier, M, Kozai, M, Lea, R, Li, N, Lowell, A, Manghisoni, M, Moskalenko, IV, Munini, R, Naskret, M, Nelson, T, Ng, KCY, Nozzoli, F, Oliva, A, Ong, RA, Osteria, G, Pierog, T, Poulin, V, Profumo, S, Pöschl, T, Quinn, S, Re, V, Rogers, F, Ryan, J, Saffold, N, Sakai, K, Salati, P, Schael, S, Serksnyte, L, Shukla, A, Stoessl, A, Tjemsland, J, Vannuccini, E, Vecchi, M, Winkler, MW, Wright, D, Xiao, M, Xu, W, Yoshida, T, Zampa, G, and Zuccon, P

Subjects
baryon asymmetry, cosmic ray experiments, cosmic ray theory, dark matter experiments, astro-ph.HE, Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

The precise measurement of cosmic-ray antinuclei serves as an important means for identifying the nature of dark matter and other new astrophysical phenomena, and could be used with other cosmic-ray species to understand cosmic-ray production and propagation in the Galaxy. For instance, low-energy antideuterons would provide a "smoking gun" signature of dark matter annihilation or decay, essentially free of astrophysical background. Studies in recent years have emphasized that models for cosmic-ray antideuterons must be considered together with the abundant cosmic antiprotons and any potential observation of antihelium. Therefore, a second dedicated Antideuteron Workshop was organized at UCLA in March 2019, bringing together a community of theorists and experimentalists to review the status of current observations of cosmic-ray antinuclei, the theoretical work towards understanding these signatures, and the potential of upcoming measurements to illuminate ongoing controversies. This review aims to synthesize this recent work and present implications for the upcoming decade of antinuclei observations and searches. This includes discussion of a possible dark matter signature in the AMS-02 antiproton spectrum, the most recent limits from BESS Polar-II on the cosmic antideuteron flux, and reports of candidate antihelium events by AMS-02; recent collider and cosmic-ray measurements relevant for antinuclei production models; the state of cosmic-ray transport models in light of AMS-02 and Voyager data; and the prospects for upcoming experiments, such as GAPS. This provides a roadmap for progress on cosmic antinuclei signatures of dark matter in the coming years.

Published
2020

8. GAPS, low-energy antimatter for indirect dark-matter search

Author

Vannuccini, E., Aramaki, T., Bird, R., Boezio, M., Boggs, S. E., Bonvicini, V., Campana, D., Craig, W. W., von Doetinchem, P., Everson, E., Fabris, L., Gahbauer, F., Gerrity, C., Fuke, H., Hailey, C. J., Hayashi, T., Kato, C., Kawachi, A., Kozai, M., Lowell, A., Martucci, M., Mognet, S. I., Munini, R., Munakata, K., Okazaki, S., Ong, R. A., Osteria, G., Perez, K., Quinn, S., Ryan, J., Re, V., Rogers, F., Saffold, N., Shimizu, Y., Sparvoli, R., Stoessl, A., Yoshida, A., Yoshida, T., Zampa, G., and Zweerink, J.

Subjects
Physics - Instrumentation and Detectors
Abstract

The General Antiparticle Spectrometer (GAPS) is designed to carry out indirect dark matter search by measuring low-energy cosmic-ray antiparticles. Below a few GeVs the flux of antiparticles produced by cosmic-ray collisions with the interstellar medium is expected to be very low and several well-motivated beyond-standard models predict a sizable contribution to the antideuteron flux. GAPS is planned to fly on a long-duration balloon over Antarctica in the austral summer of 2020. The primary detector is a 1m3 central volume containing planes of Si(Li) detectors. This volume is surrounded by a time-of-flight system to both trigger the Si(Li) detector and reconstruct the particle tracks. The detection principle of the experiment relies on the identification of the antiparticle annihilation pattern. Low energy antiparticles slow down in the apparatus and they are captured in the medium to form exotic excited atoms, which de-excite by emitting characteristic X-rays. Afterwards they undergo nuclear annihilation, resulting in a star of pions and protons. The simultaneous measurement of the stopping depth and the dE/dx loss of the primary antiparticle, of the X-ray energies and of the star particle-multiplicity provides very high rejection power, that is critical in rare-event search. GAPS will be able to perform a precise measurement of the cosmic antiproton flux below 250 MeV, as well as a sensitive search for antideuterons., Comment: 7 pages, 3 figures, Low Energy Antiproton Physics Conference (LEAP) 2018, Paris (France)

Published
2018

9. GAPS: A New Cosmic Ray Anti-matter Experiment

Author

Quinn, S., Aramaki, T., Bird, R., Boezio, M., Boggs, S. E., Bonvicini, V., Campana, D., Craig, W. W., von Doetinchem, P., Everson, E., Fabris, L., Gahbauer, F., Gerrity, C., Fuke, H., Hailey, C. J., Hayashi, T., Kato, C., Kawachi, A., Kozai, M., Lowell, A., Martucci, M., Mognet, S. I., Munini, R., Munakata, K., Okazaki, S., Ong, R. A., Osteria, G., Perez, K., Ryan, J., Re, V., Rogers, F., Saffold, N., Shimizu, Y., Sparvoli, R., Stoessl, A., Vannuccini, E., Yoshida, A., Yoshida, T., Zampa, G., and Zweerink, J.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

The General AntiParticle Spectrometer (GAPS) is a balloon-borne instrument designed to detect cosmic-ray antimatter using the novel exotic atom technique, obviating the strong magnetic fields required by experiments like AMS, PAMELA, or BESS. It will be sensitive to primary antideuterons with kinetic energies of $\approx0.05-0.2$ GeV/nucleon, providing some overlap with the previously mentioned experiments at the highest energies. For $3\times35$ day balloon flights, and standard classes of primary antideuteron propagation models, GAPS will be sensitive to $m_{\mathrm{DM}}\approx10-100$ GeV c$^{-2}$ WIMPs with a dark-matter flux to astrophysical flux ratio approaching 100. This clean primary channel is a key feature of GAPS and is crucial for a rare event search. Additionally, the antiproton spectrum will be extended with high statistics measurements to cover the $0.07 \leq E \leq 0.25 $ GeV domain. For $E>0.2$ GeV GAPS data will be complementary to existing experiments, while $E<0.2$ GeV explores a new regime. The first flight is scheduled for late 2020 in Antarctica. These proceedings will describe the astrophysical processes and backgrounds relevant to the dark matter search, a brief discussion of detector operation, and construction progress made to date., Comment: Talk presented CIPANP2018. 13 pages, LaTeX, 7 figures. Higher resolution figs at http://gaps1.astro.ucla.edu/gaps/papers2018/cipanp18

Published
2018

10. The GAPS Experiment to Search for Dark Matter using Low-energy Antimatter

Author

Ong, R. A., Aramaki, T., Bird, R., Boezio, M., Boggs, S. E., Carr, R., Craig, W. W., von Doetinchem, P., Fabris, L., Gahbauer, F., Gerrity, C., Fuke, H., Hailey, C. J., Kato, C., Kawachi, A., Kozai, M., Mognet, S. I., Munakata, K., Okazaki, S., Osteria, G., Perez, K., Re, V., Rogers, F., Saffold, N., Shimizu, Y., Yoshida, A., Yoshida, T., Zampa, G., and Zweerink, J.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Experiment
Abstract

The GAPS experiment is designed to carry out a sensitive dark matter search by measuring low-energy cosmic ray antideuterons and antiprotons. GAPS will provide a new avenue to access a wide range of dark matter models and masses that is complementary to direct detection techniques, collider experiments and other indirect detection techniques. Well-motivated theories beyond the Standard Model contain viable dark matter candidates which could lead to a detectable signal of antideuterons resulting from the annihilation or decay of dark matter particles. The dark matter contribution to the antideuteron flux is believed to be especially large at low energies (E < 1 GeV), where the predicted flux from conventional astrophysical sources (i.e. from secondary interactions of cosmic rays) is very low. The GAPS low-energy antiproton search will provide stringent constraints on less than 10 GeV dark matter, will provide the best limits on primordial black hole evaporation on Galactic length scales, and will explore new discovery space in cosmic ray physics. Unlike other antimatter search experiments such as BESS and AMS that use magnetic spectrometers, GAPS detects antideuterons and antiprotons using an exotic atom technique. This technique, and its unique event topology, will give GAPS a nearly background-free detection capability that is critical in a rare-event search. GAPS is designed to carry out its science program using long-duration balloon flights in Antarctica. A prototype instrument was successfully flown from Taiki, Japan in 2012. GAPS has now been approved by NASA to proceed towards the full science instrument, with the possibility of a first long-duration balloon flight in late 2020. Here we motivate low-energy cosmic ray antimatter searches and discuss the current status of the GAPS experiment and the design of the payload., Comment: 8 pags, 3 figures, Proc. 35th International Cosmic Ray Conference (ICRC 2017), Busan, Korea

Published
2017

11. Cosmic antihelium-3 nuclei sensitivity of the GAPS experiment

Author

Saffold, N., Aramaki, T., Bird, R., Boezio, M., Boggs, S.E., Bonvicini, V., Campana, D., Craig, W.W., von Doetinchem, P., Everson, E., Fabris, L., Fuke, H., Gahbauer, F., Garcia, I., Gerrity, C., Hailey, C.J., Hayashi, T., Kato, C., Kawachi, A., Kobayashi, S., Kozai, M., Lenni, A., Lowell, A., Manghisoni, M., Marcelli, N., Mognet, S.I., Munakata, K., Munini, R., Nakagami, Y., Olson, J., Ong, R.A., Osteria, G., Perez, K., Pope, I., Quinn, S., Re, V., Reed, M., Riceputi, E., Roach, B., Rogers, F., Ryan, J.L., Scotti, V., Shimizu, Y., Sonzogni, M., Sparvoli, R., Stoessl, A., Tiberio, A., Vannuccini, E., Wada, T., Xiao, M., Yamatani, M., Yoshida, A., Yoshida, T., Zampa, G., and Zweerink, J.

Published
2021
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12. Search for Dark Matter signatures from cosmic-ray antinuclei with the GAPS experiment

Author

Tiberio, Alessio, primary, Aramaki, T., additional, Bird, R., additional, Boezio, M., additional, Boggs, S. E., additional, Bonvicini, V., additional, Campana, D., additional, Craig, W. W., additional, Everson, E., additional, Fabris, L., additional, Fuke, H., additional, Gahbauer, F., additional, Garcia, I., additional, Gerrity, C., additional, Hailey, C. J., additional, Hayashi, T., additional, Kato, C., additional, Kawachi, A., additional, Kobayashi, S., additional, Kozai, M., additional, Lenni, A., additional, Lowell, A., additional, Manghisoni, M., additional, Marcelli, N., additional, Mochizuki, B., additional, Mognet, S. I., additional, Munakata, K., additional, Munini, R., additional, Nakagami, Y., additional, Olson, J., additional, Ong, R. A., additional, Osteria, G., additional, Perez, K., additional, Quinn, S., additional, Re, V., additional, Riceputi, E., additional, Roach, B., additional, Rogers, F., additional, Ryan, J. A., additional, Saffold, N., additional, Scotti, V., additional, Shimizu, Y., additional, Sonzogni, M., additional, Sparvoli, R., additional, Stoessl, A., additional, Vannuccini, E., additional, von Doetinchem, P., additional, Wada, T., additional, Xiao, M., additional, Yamatami, M., additional, Yoshida, A., additional, Yoshida, T., additional, Zampa, G., additional, and Zweerink, J., additional

Published
2022
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13. In Search of Cosmic-Ray Antinuclei from Dark Matter with the GAPS Experiment

Author

Xiao, M., Aramaki, T., Bird, R., Boezio, M., Boggs, S. E., Bonvicini, V., Campana, D., Craig, W. W., Everson, E., Fabris, L., Fuke, H., Gahbauer, F., Garcia, I., Gerrity, C., Hailey, C. J., Hayashi, T., Kato, C., Kawachi, A., Kobayashi, S., Kozai, M., Lenni, A., Lowell, A., Manghisoni, Massimo, Marcelli, N., Mochizuki, B., Mognet, S. A. I., Munakata, K., Munini, R., Nakagami, Y., Olson, J., Ong, R. A., Osteria, G., Perez, K., Quinn, S., Re, Valerio, Riceputi, Elisa, Roach, B., Rogers, F., Ryan, J. A., Saffold, N., Scotti, V., Shimizu, Y., Sonzogni, M., Sparvoli, R., Stoessl, A., Tiberio, A., Vannuccini, E., von Doetinchem, P., Wada, T., Yamatami, M., Yoshida, A., Yoshida, T., Zampa, G., and Zweerink, J.

Subjects
Dark matter, readout electronics, Astroparticle physics, detectors, Settore ING-INF/01 - Elettronica
Published
2022

14. The GAPS Instrument: A Large Area Time of Flight and High Resolution Exotic Atom Spectrometer for Cosmic Antinuclei

Author

Quinn, S., Aramaki, T., Bird, R., Boezio, M., Boggs, S. E., Bonvicini, V., Campana, D., Craig, W. W., Everson, E., Fabris, L., Fuke, H., Gahbauer, F., Garcia, I., Gerrity, C., Hailey, C. J., Hayashi, T., Kato, C., Kawachi, A., Kobayashi, S., Kozai, M., Lenni, A., Lowell, A., Manghisoni, Massimo, Marcelli, N., Martucci, M., Mognet, S. I., Munakata, K., Munini, R., Nakagami, Y., Okazaki, S., Olson, J., Ong, R. A., Osteria, G., Perez, K., Re, Valerio, Riceputi, Elisa, Roach, B., Rogers, F., Ryan, J. A., Saffold, N., Saijo, M., Scotti, V., Shimizu, Y., Sonzogni, M., Sparvoli, R., Stoessl, A., Tokunaga, K., Vannuccini, E., von Doetinchem, P., Wada, T., Xiao, M., Yoshida, A., Yoshida, T., Zampa, G., and Zweerink, J.

Subjects
Settore ING-INF/01 - Elettronica
Published
2022

15. Neural Networks approach to event reconstruction for the GAPS experiment

Author

Marcelli, N., Aramaki, T., Bird, R., Boezio, M., Boggs, S. E., Bonvicini, V., Campana, D., Craig, W. W., Everson, E., Fabris, L., Fuke, H., Gahbauer, F., Garcia, I., Gerrity, C., Hailey, C. J., Hayashi, T., Kato, C., Kawachi, A., Kobayashi, S., Kozai, M., Lenni, A., Lowell, A., Manghisoni, Massimo, Mochizuki, B., Mognet, S. A. I., Munakata, K., Munini, R., Nakagami, Y., Olson, J., Ong, R. A., Osteria, G., Perez, K., Quinn, S., Re, Valerio, Riceputi, Elisa, Roach, B., Rogers, F., Ryan, J. A., Saffold, N., Scotti, V., Shimizu, Y., Sonzogni, M., Sparvoli, R., Stoessl, A., Tiberio, A., Vannuccini, E., von Doetinchem, P., Wada, T., Xiao, M., Yamatami, M., Yoshida, A., Yoshida, T., Zampa, G., and Zweerink, J.

Subjects
Settore ING-INF/01 - Elettronica
Published
2022

16. The antinucleus annihilation reconstruction algorithm of the GAPS experiment

Author

Munini, R., primary, Vannuccini, E., additional, Boezio, M., additional, von Doetinchem, P., additional, Gerrity, C., additional, Lenni, A., additional, Marcelli, N., additional, Quinn, S., additional, Rogers, F., additional, Ryan, J.L., additional, Stoessl, A., additional, Xiao, M., additional, Saffold, N., additional, Tiberio, A., additional, and Yamatani, M., additional

Published
2021
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17. Searching for cosmic antihelium nuclei with the GAPS experiment

Author

Stoessl, A., Aramaki, T., Bird, R., Boezio, M., Boggs, S. E., Bonvicini, V., Campana, D., Craig, W. W., Everson, E., Fabris, L., Fuke, H., Gahbauer, F., Garcia, I., Gerrity, C., Hailey, C. J., Hayashi, T., Kato, C., Kawachi, A., Kobayashi, S., Kozai, M., Lenni, A., Lowell, A., Manghisoni, Massimo, Marcelli, N., Mognet, S. A. I., Munakata, K., Munini, R., Nakagami, Y., Olson, J., Ong, R. A., Osteria, G., Perez, K., Quinn, S., Re, Valerio, Riceputi, Elisa, Roach, B., Rogers, F., Ryan, J. A., Saffold, N., Scotti, V., Shimizu, Y., Sonzogni, M., Sparvoli, R., Tiberio, A., Vannuccini, E., von Doetinchem, P., Wada, T., Xiao, M., Yamatami, M., Yoshida, A., Yoshida, T., Zampa, G., Zweerink, J., Aramaki, T., Bird, R., Boezio, M., Boggs, S. E., Bonvicini, V., Campana, D., Craig, W. W., Everson, E., Fabris, L., Fuke, H., Gahbauer, F., Garcia, I., Gerrity, C., Hailey, C. J., Hayashi, T., Kato, C., Kawachi, A., Kobayashi, S., Kozai, M., Lenni, A., Lowell, A., Manghisoni, M., Marcelli, N., Mochizuki, B., Mognet, S. A. I., Munakata, K., Munini, R., Nakagami, Y., Olson, J., Ong, R. A., Osteria, G., Perez, K., Quinn, S., Re, V., Riceputi, E., Roach, B., Rogers, F., Ryan, J. A., Saffold, N., Scotti, V., Shimizu, Y., Sonzogni, M., Sparvoli, R., Stoessl, A., Tiberio, A., Vannuccini, E., von Doetinchem, P., Wada, T., Xiao, M., Yamatani, M., Yoshida, A., Yoshida, T., Zampa, G., and Zweerink, J.

Subjects
Astroparticle Physics, cosmic rays, Readout electronics, Dark matter, Detectors, GAPS, cosmic antihelium, Settore ING-INF/01 - Elettronica, cosmic ray
Abstract

At low energies, cosmic antideuterons and antihelium provide an ultra-low background signature of dark matter annihilation, decay, and other beyond the Standard Model phenomena. The General Antiparticle Spectrometer (GAPS) is an Antarctic balloon experiment designed to search for lowenergy (0.1−0.3 GeV/n) antinuclei, and is planned to launch in the austral summer of 2022. While optimized for an antideuteron search, GAPS also has unprecedented capabilites for the detection of low-energy antihelium nuclei, utilizing a novel detection technique based on the formation, decay, and annihilation of exotic atoms. The AMS-02 collaboration has recently reported several antihelium nuclei candidate events, which sets GAPS in a unique position to set constraints on the cosmic antihelium flux in an energy region which is essentially free of astrophysical background. In this contribution, we illustrate the capabilities of GAPS to search for cosmic antihelium-3 utilizing complete instrument simulations, event reconstruction, and the inclusion of atmospheric effects. We show that GAPS is capable of setting unprecedented limits on the cosmic antihelium flux, opening a new window on exotic cosmic physics.

Published
2021

18. Neural Networks approach to event reconstruction for the GAPS experiment

Author

Aramaki, T., Bird, R., Boezio, M., Boggs, S. E., Bonvicini, V., Campana, D., Craig, W. W., Everson, E., Fabris, L., Fuke, H., Gahbauer, F., Garcia, I., Gerrity, C., Hailey, C. J., Hayashi, T., Kato, C., Kawachi, A., Kobayashi, S., Kozai, M., Lenni, A., Lowell, A., Manghisoni, M., Marcelli, N., Mochizuki, B., Mognet, S. A. I., Munakata, K., Munini, R., Nakagami, Y., Olson, J., Ong, R. A., Osteria, G., Perez, K., Quinn, S., Re, V., Riceputi, E., Roach, B., Rogers, F., Ryan, J. A., Saffold, N., Scotti, V., Shimizu, Y., Sonzogni, M., Sparvoli, R., Stoessl, A., Tiberio, A., Vannuccini, E., von Doetinchem, P., Wada, T., Xiao, M., Yamatani, M., Yoshida, A., Yoshida, T., Zampa, G., Zweerink, J., Aramaki, T., Bird, R., Boezio, M., Boggs, S. E., Bonvicini, V., Campana, D., Craig, W. W., Everson, E., Fabris, L., Fuke, H., Gahbauer, F., Garcia, I., Gerrity, C., Hailey, C. J., Hayashi, T., Kato, C., Kawachi, A., Kobayashi, S., Kozai, M., Lenni, A., Lowell, A., Manghisoni, M., Marcelli, N., Mochizuki, B., Mognet, S. A. I., Munakata, K., Munini, R., Nakagami, Y., Olson, J., Ong, R. A., Osteria, G., Perez, K., Quinn, S., Re, V., Riceputi, E., Roach, B., Rogers, F., Ryan, J. A., Saffold, N., Scotti, V., Shimizu, Y., Sonzogni, M., Sparvoli, R., Stoessl, A., Tiberio, A., Vannuccini, E., von Doetinchem, P., Wada, T., Xiao, M., Yamatani, M., Yoshida, A., Yoshida, T., Zampa, G., and Zweerink, J.

Subjects
GAPS, neural networks, event reconstruction, neural network
Abstract

The General Antiparticle Spectrometer (GAPS) is a balloon-borne experiment, scheduled for a first flight in the austral summer 2022. It is designed to measure low energy (< 0.25 GeV/n) cosmic antinuclei. A particular focus is on antideuterons, which are predicted to have an ultra-low astrophysical background as compared to signals from dark matter annihilation or decay in the Galactic halo. GAPS uses a novel technique for particle identification based on the formation and decay of exotic atoms. To achieve sufficient rejection power for particle identification, an accurate determination of several fundamental quantities is needed. The precise reconstruction of the energy deposition pattern on the primary track is a particularly intricate problem and we developed a strategy devised to solve this using modern machine learning techniques. In the future, this approach can also be used for particle identification. Here, we present preliminary results of these efforts obtained from simulations.

Published
2021

19. Cosmic Antiproton Sensitivity for the GAPS Experiment

Author

Rogers, Field, primary, Aramaki, T, additional, Bird, R, additional, Aramaki, T., additional, Bird, R., additional, Boezio, M., additional, Boggs, S. E., additional, Bonvicini, V., additional, Campana, D., additional, Craig, W. W., additional, Everson, E., additional, Fabris, L., additional, Fuke, H., additional, Gahbauer, F., additional, Garcia, I., additional, Gerrity, C., additional, Hailey, C. J., additional, Hayashi, T., additional, Kato, C., additional, Kawachi, A., additional, Kobayashi, S., additional, Kozai, M., additional, Lenni, A., additional, Lowell, A., additional, Manghisoni, M., additional, Marcelli, N., additional, Mochizuki, B., additional, Mognet, S. A. I., additional, Munakata, K., additional, Munini, R., additional, Nakagami, Y., additional, Olson, J., additional, Ong, R. A., additional, Osteria, G., additional, Perez, K., additional, Quinn, S., additional, Re, V., additional, Riceputi, E., additional, Roach, B., additional, Ryan, J. A., additional, Saffold, N., additional, Scotti, V., additional, Shimizu, Y., additional, Sonzogni, M., additional, Sparvoli, R., additional, Stoessl, A., additional, Tiberio, A., additional, Vannuccini, E., additional, von Doetinchem, P., additional, Wada, T., additional, Xiao, M., additional, Yamatani, M., additional, Yoshida, A., additional, Yoshida, T., additional, Zampa, G., additional, and Zweerink, J., additional

Published
2021
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20. Reconstruction of antinucleus-annihilation events in the GAPS experiment

Author

Tiberio, Alessio, primary, Aramaki, T., additional, Bird, R., additional, Boezio, M., additional, Boggs, S. E., additional, Bonvicini, V., additional, Campana, D., additional, Craig, W. W., additional, Everson, E., additional, Fabris, L., additional, Fuke, H., additional, Gahbauer, F., additional, Garcia, I., additional, Gerrity, C., additional, Hailey, C. J., additional, Hayashi, T., additional, Kato, C., additional, Kawachi, A., additional, Kobayashi, S., additional, Kozai, M., additional, Lenni, A., additional, Lowell, A., additional, Manghisoni, M., additional, Marcelli, N., additional, Mochizuki, B., additional, Mognet, S. I., additional, Munakata, K., additional, Munini, R., additional, Nakagami, Y., additional, Olson, J., additional, Ong, R. A., additional, Osteria, G., additional, Perez, K., additional, Quinn, S., additional, Re, V., additional, Riceputi, E., additional, Roach, B., additional, Rogers, F., additional, Ryan, J. A., additional, Saffold, N., additional, Scotti, V., additional, Shimizu, Y., additional, Sonzogni, M., additional, Sparvoli, R., additional, Stoessl, A., additional, Vannuccini, E., additional, von Doetinchem, P., additional, Wada, T., additional, Xiao, M., additional, Yamatami, M., additional, Yoshida, A., additional, Yoshida, T., additional, Zampa, G., additional, and Zweerink, J., additional

Published
2021
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21. Cosmic-ray antinuclei as messengers of new physics: status and outlook for the new decade

Author

Doetinchem, P. von, primary, Perez, K., additional, Aramaki, T., additional, Baker, S., additional, Barwick, S., additional, Bird, R., additional, Boezio, M., additional, Boggs, S.E., additional, Cui, M., additional, Datta, A., additional, Donato, F., additional, Evoli, C., additional, Fabris, L., additional, Fabbietti, L., additional, Bueno, E. Ferronato, additional, Fornengo, N., additional, Fuke, H., additional, Gerrity, C., additional, Coral, D. Gomez, additional, Hailey, C., additional, Hooper, D., additional, Kachelriess, M., additional, Korsmeier, M., additional, Kozai, M., additional, Lea, R., additional, Li, N., additional, Lowell, A., additional, Manghisoni, M., additional, Moskalenko, I.V., additional, Munini, R., additional, Naskret, M., additional, Nelson, T., additional, Ng, K.C.Y., additional, Nozzoli, F., additional, Oliva, A., additional, Ong, R.A., additional, Osteria, G., additional, Pierog, T., additional, Poulin, V., additional, Profumo, S., additional, Pöschl, T., additional, Quinn, S., additional, Re, V., additional, Rogers, F., additional, Ryan, J., additional, Saffold, N., additional, Sakai, K., additional, Salati, P., additional, Schael, S., additional, Serksnyte, L., additional, Shukla, A., additional, Stoessl, A., additional, Tjemsland, J., additional, Vannuccini, E., additional, Vecchi, M., additional, Winkler, M.W., additional, Wright, D., additional, Xiao, M., additional, Xu, W., additional, Yoshida, T., additional, Zampa, G., additional, and Zuccon, P., additional

Published
2020
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22. GAPS: A New Cosmic Ray Anti-matter Experiment

Author

Quinn, S., Tsuguo Aramaki, Bird, R., Boezio, M., Boggs, S. E., Bonvicini, V., Campana, D., Craig, W. W., Doetinchem, P., Everson, E., Fabris, L., Gahbauer, F., Gerrity, C., Fuke, H., Hailey, C. J., Hayashi, T., Kato, C., Kawachi, A., Kozai, M., Lowell, A., Martucci, M., Mognet, S. I., Munini, R., Munakata, K., Okazaki, S., Ong, R. A., Osteria, G., Perez, K., Ryan, J., Re, V., Rogers, F., Saffold, N., Shimizu, Y., Sparvoli, R., Stoessl, A., Vannuccini, E., Yoshida, A., Yoshida, T., Zampa, G., and Zweerink, J.

Subjects
Physics - Instrumentation and Detectors, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Nuclear Experiment, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM)
Abstract

The General AntiParticle Spectrometer (GAPS) is a balloon-borne instrument designed to detect cosmic-ray antimatter using the novel exotic atom technique, obviating the strong magnetic fields required by experiments like AMS, PAMELA, or BESS. It will be sensitive to primary antideuterons with kinetic energies of $\approx0.05-0.2$ GeV/nucleon, providing some overlap with the previously mentioned experiments at the highest energies. For $3\times35$ day balloon flights, and standard classes of primary antideuteron propagation models, GAPS will be sensitive to $m_{\mathrm{DM}}\approx10-100$ GeV c$^{-2}$ WIMPs with a dark-matter flux to astrophysical flux ratio approaching 100. This clean primary channel is a key feature of GAPS and is crucial for a rare event search. Additionally, the antiproton spectrum will be extended with high statistics measurements to cover the $0.07 \leq E \leq 0.25 $ GeV domain. For $E>0.2$ GeV GAPS data will be complementary to existing experiments, while $E, Talk presented CIPANP2018. 13 pages, LaTeX, 7 figures. Higher resolution figs at http://gaps1.astro.ucla.edu/gaps/papers2018/cipanp18

23. The GAPS Instrument: A Large Area Time of Flight and High Resolution Exotic Atom Spectrometer for Cosmic Antinuclei

Author

T. Aramaki, R. Bird, M. Boezio, S. E. Boggs, V. Bonvicini, D. Campana, W. W. Craig, E. Everson, L. Fabris, H. Fuke, F. Gahbauer, I. Garcia, C. Gerrity, C. J. Hailey, T. Hayashi, C. Kato, A. Kawachi, S. Kobayashi, M. Kozai, A. Lenni, A. Lowell, M. Manghisoni, N. Marcelli, B. Mochizuki, S. A. I. Mognet, K. Munakata, R. Munini, Y. Nakagami, J. Olson, R. A. Ong, G. Osteria, K. Perez, S. Quinn, V. Re, E. Riceputi, B. Roach, F. Rogers, J. A. Ryan, N. Saffold, V. Scotti, Y. Shimizu, M. Sonzogni, R. Sparvoli, A. Stoessl, A. Tiberio, E. Vannuccini, P. von Doetinchem, T. Wada, M. Xiao, M. Yamatani, A. Yoshida, T. Yoshida, G. Zampa, J. Zweerink, Aramaki, T., Bird, R., Boezio, M., Boggs, S. E., Bonvicini, V., Campana, D., Craig, W. W., Everson, E., Fabris, L., Fuke, H., Gahbauer, F., Garcia, I., Gerrity, C., Hailey, C. J., Hayashi, T., Kato, C., Kawachi, A., Kobayashi, S., Kozai, M., Lenni, A., Lowell, A., Manghisoni, M., Marcelli, N., Mochizuki, B., Mognet, S. A. I., Munakata, K., Munini, R., Nakagami, Y., Olson, J., Ong, R. A., Osteria, G., Perez, K., Quinn, S., Re, V., Riceputi, E., Roach, B., Rogers, F., Ryan, J. A., Saffold, N., Scotti, V., Shimizu, Y., Sonzogni, M., Sparvoli, R., Stoessl, A., Tiberio, A., Vannuccini, E., von Doetinchem, P., Wada, T., Xiao, M., Yamatani, M., Yoshida, A., Yoshida, T., Zampa, G., and Zweerink, J.

Subjects
Physics, Antiparticle, COSMIC cancer database, Spectrometer, Dark matter, GAPS, large-area Time-of-Flight, high-resolution exotic-atom spectrometer, cosmic-ray antinuclei, Cosmic ray, Scintillator, Nuclear physics, Antiproton, high-resolution exotic-atom spectrometer, large-area Time-of-Flight, Exotic atom
Abstract

Low-energy cosmic ray antideuterons ($

Published
2022

24. Cosmic Antiproton Sensitivity for the GAPS Experiment

Author

Field Rogers, T Aramaki, R Bird, T. Aramaki, R. Bird, M. Boezio, S. E. Boggs, V. Bonvicini, D. Campana, W. W. Craig, E. Everson, L. Fabris, H. Fuke, F. Gahbauer, I. Garcia, C. Gerrity, C. J. Hailey, T. Hayashi, C. Kato, A. Kawachi, S. Kobayashi, M. Kozai, A. Lenni, A. Lowell, M. Manghisoni, N. Marcelli, B. Mochizuki, S. A. I. Mognet, K. Munakata, R. Munini, Y. Nakagami, J. Olson, R. A. Ong, G. Osteria, K. Perez, S. Quinn, V. Re, E. Riceputi, B. Roach, J. A. Ryan, N. Saffold, V. Scotti, Y. Shimizu, M. Sonzogni, R. Sparvoli, A. Stoessl, A. Tiberio, E. Vannuccini, P. von Doetinchem, T. Wada, M. Xiao, M. Yamatani, A. Yoshida, T. Yoshida, G. Zampa, J. Zweerink, Aramaki, T., Bird, R., Boezio, M., Boggs, S. E., Bonvicini, V., Campana, D., Craig, W. W., Everson, E., Fabris, L., Fuke, H., Gahbauer, F., Garcia, I., Gerrity, C., Hailey, C. J., Hayashi, T., Kato, C., Kawachi, A., Kobayashi, S., Kozai, M., Lenni, A., Lowell, A., Manghisoni, M., Marcelli, N., Mochizuki, B., Mognet, S. A. I., Munakata, K., Munini, R., Nakagami, Y., Olson, J., Ong, R. A., Osteria, G., Perez, K., Quinn, S., Re, V., Riceputi, E., Roach, B., Rogers, F., Ryan, J. A., Saffold, N., Scotti, V., Shimizu, Y., Sonzogni, M., Sparvoli, R., Stoessl, A., Tiberio, A., Vannuccini, E., von Doetinchem, P., Wada, T., Xiao, M., Yamatani, M., Yoshida, A., Yoshida, T., Zampa, G., and Zweerink, J.

Subjects
Physics, Antiparticle, COSMIC cancer database, Spectrometer, Dark matter, Cosmic ray, Particle identification, Nuclear physics, cosmic rays, Antiproton, GAPS, antiproton sensitivity, Nuclear Experiment, cosmic ray, Exotic atom
Abstract

The General Antiparticle Spectrometer (GAPS) experiment is a balloon payload designed to measure low-energy cosmic antinuclei during at least three $\sim$35-day Antarctic flights, with the first flight planned for December, 2022. With its large geometric acceptance and novel exotic atom-based particle identification method, GAPS will detect $\sim$1000 antiprotons per flight, producing a precision cosmic antiproton spectrum in the kinetic energy range of $0.03 - 0.23$ GeV/$n$ at float altitude (corresponding to $0.085- 0.30$ GeV/$n$ at the top of the atmosphere). With these high statistics in a measurement extending to lower energy than any previous experiment, and with orthogonal sources of systematic uncertainty compared to measurements made using traditional magnetic spectrometer techniques, the GAPS antiproton measurement will be sensitive to physics including dark matter annihilation, primordial black hole evaporation, and cosmic ray propagation. The antiproton measurement will also validate the GAPS exotic atom technique for the antideuteron and antihelium rare-event searches and provide insight into models of cosmic particle attenuation and production in the atmosphere. This contribution demonstrates the GAPS sensitivity to antiprotons using a full instrument simulation, event reconstruction, and solar and atmospheric effects.

Published
2021

25. In Search of Cosmic-Ray Antinuclei from Dark Matter with the GAPS Experiment

Author

T. Aramaki, R. Bird, M. Boezio, S. E. Boggs, V. Bonvicini, D. Campana, W. W. Craig, E. Everson, L. Fabris, H. Fuke, F. Gahbauer, I. Garcia, C. Gerrity, C. J. Hailey, T. Hayashi, C. Kato, A. Kawachi, S. Kobayashi, M. Kozai, A. Lenni, A. Lowell, M. Manghisoni, N. Marcelli, B. Mochizuki, S. A. I. Mognet, K. Munakata, R. Munini, Y. Nakagami, J. Olson, R. A. Ong, G. Osteria, K. Perez, S. Quinn, V. Re, E. Riceputi, B. Roach, F. Rogers, J. A. Ryan, N. Saffold, V. Scotti, Y. Shimizu, M. Sonzogni, R. Sparvoli, A. Stoessl, A. Tiberio, E. Vannuccini, P. von Doetinchem, T. Wada, M. Xiao, M. Yamatani, A. Yoshida, T. Yoshida, G. Zampa, J. Zweerink, Aramaki, T., Bird, R., Boezio, M., Boggs, S. E., Bonvicini, V., Campana, D., Craig, W. W., Everson, E., Fabris, L., Fuke, H., Gahbauer, F., Garcia, I., Gerrity, C., Hailey, C. J., Hayashi, T., Kato, C., Kawachi, A., Kobayashi, S., Kozai, M., Lenni, A., Lowell, A., Manghisoni, M., Marcelli, N., Mochizuki, B., Mognet, S. A. I., Munakata, K., Munini, R., Nakagami, Y., Olson, J., Ong, R. A., Osteria, G., Perez, K., Quinn, S., Re, V., Riceputi, E., Roach, B., Rogers, F., Ryan, J. A., Saffold, N., Scotti, V., Shimizu, Y., Sonzogni, M., Sparvoli, R., Stoessl, A., Tiberio, A., Vannuccini, E., von Doetinchem, P., Wada, T., Xiao, M., Yamatani, M., Yoshida, A., Yoshida, T., Zampa, G., and Zweerink, J.

Subjects
Physics, GAPS, cosmic-ray antinuclei, dark-matter search, Dark matter, Cosmic ray, Astrophysics
Abstract

The General Antiparticle Spectrometer (GAPS) is the first experiment optimized to identify low energy (

Published
2021

26. The antinucleus annihilation reconstruction algorithm of the GAPS experiment

Author

Mirko Boezio, Nadir Marcelli, S. Quinn, A. Tiberio, C. Gerrity, F. Rogers, Meng Xiao, A. Lenni, A. Stoessl, M. Yamatani, E. Vannuccini, J.L. Ryan, P. von Doetinchem, Riccardo Munini, N. Saffold, Munini, R., Vannuccini, E., Boezio, M., von Doetinchem, P., Gerrity, C., Lenni, A., Marcelli, N., Quinn, S., Rogers, F., Ryan, J. L., Stoessl, A., Xiao, M., Saffold, N., Tiberio, A., and Yamatani, M.

Subjects
Antiparticle, Physics - Instrumentation and Detectors, Dark matter, Annihilation, FOS: Physical sciences, Cosmic-rays, 01 natural sciences, Particle identification, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, 010306 general physics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Exotic atom, Physics, Cosmic-ray, 010308 nuclear & particles physics, Detector, Astronomy and Astrophysics, Reconstruction algorithm, Instrumentation and Detectors (physics.ins-det), Charged particle, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The General AntiParticle Spectrometer (GAPS) is an Antarctic balloon-borne detector designed to measure low-energy cosmic antinuclei ( 0 . 25 GeV/ n ), with a specific focus on antideuterons, as a distinctive signal from dark matter annihilation or decay in the Galactic halo. The instrument consists of a tracker, made up of ten planes of lithium-drifted Silicon Si(Li) detectors, surrounded by a plastic scintillator Time-of-Flight system. GAPS uses a novel particle identification method based on exotic atom capture and decay with the emission of pions, protons, and atomic X-rays from a common annihilation vertex. An important ingredient for the antinuclei identification is the reconstruction of the “annihilation star” topology. A custom antinucleus annihilation reconstruction algorithm, called the “star-finding” algorithm, was developed to reconstruct the annihilation star fully, determining the annihilation vertex position and reconstructing the tracks of the primary and secondary charged particles. The reconstruction algorithm and its performances were studied on simulated data obtained with the Geant4 -based GAPS simulation software, which fully reproduced the detector geometry. This custom algorithm was found to have better performance in the vertex resolution and reconstruction efficiency compared with a standard Hough-3D algorithm.

Published
2021
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27. Primary ovarian lymphoma: A case report.

Author

Gerrity C, Mercadel A, Alghamdi A, and Huang M

Abstract

While Non-Hodgkin Lymphoma (NHL) often involves the ovaries at time of autopsy, it is rarely present at the time of diagnosis. Here we present a case of a 20-year-old who presented with a large adnexal mass and elevated B-HCG, CA-125, and LDH. The patient underwent exploratory laparotomy, and frozen section of the left ovarian mass was suspected to be a dysgerminoma. Final pathologic diagnosis was Ann Arbor stage IVE Diffuse Large B-Cell Lymphoma, germinal center subtype. Patient is currently undergoing chemotherapy and has received the 3 of a planned 6 cycles of R-CHOP., Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (© 2023 The Authors. Published by Elsevier Inc.)

Published
2023
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28. Decision Making for Infants With Neurologic Conditions.

Author

Gerrity C, Farley S, Barks MC, Ubel PA, Brandon D, Pollak KI, and Lemmon ME

Subjects
Decision Making, Humans, Infant, Parents, Nervous System Diseases diagnosis, Nervous System Diseases therapy, Professional-Family Relations
Abstract

Parents and clinicians caring for infants with neurologic disease often make high-stakes decisions about infant care. To characterize how these decisions occur, we enrolled infants with neurologic conditions, their parents, and their clinicians in a longitudinal mixed methods study of decision making. We audio recorded family conferences as they occurred and analyzed conferences using a directed content analysis approach. We enrolled 40 infants and 61 parents who participated in 68 family conferences. Thirty-seven conferences contained a treatment decision. We identified 4 key domains of the decision-making process: medical information exchange, values-based exchange, therapeutic partnership, and integration of values into decision making. Discussion of values was typically parent initiated (n = 20, 83%); approximately one-third of conferences did not contain any discussion of parent values. Integration of family values and preferences into decision making occurred in approximately half of conferences. These findings highlight opportunities for interventions that promote values discussion and the integration of values into decision making.

Published
2022
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