Bulletin of the American Physical Society
APS April Meeting 2018
Volume 63, Number 4
Saturday–Tuesday, April 14–17, 2018; Columbus, Ohio
Session G15: Medium Energy Cosmic Rays |
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Sponsoring Units: DAP Chair: William Hanlon, The University of Utah Room: B230-231 |
Sunday, April 15, 2018 8:30AM - 8:42AM |
G15.00001: Measurement of Cosmic-Ray Electron and Positron Spectrum from 10 GeV to 3 TeV with the CALET Alexander Moiseev The Calorimetric Electron Telescope (CALET) was launched on August 19, 2015 and installed on the International Space Station with the primary science goal to conduct the accurate measurements of the cosmic-ray electron and positron spectrum from 1 GeV to 20 TeV. In addition, CALET is capable to measure cosmic-ray nuclei with Z ranging from 1 to 40, and gamma-rays with energy from 1 GeV up to 10 TeV . CALET is an all-calorimetric instrument with total vertical thickness of 30 $X_0$ and a fine imaging capability designed to achieve a large proton rejection and excellent energy resolution, providing accurate measurements of the electron spectrum. CALET consists of a fine-grained preshower imaging calorimeter IMC, a total absorption calorimeter TASC, and a charge detector CHD which contributes to the particle identification. The observed all-electron spectrum over 30 GeV can be fit with a single power law, with some indications of spectral structure subject to the further investigation with larger statistics. Since the launch CALET has collected about half a million of electrons and positrons and continues successful operation on orbit. In this paper we will present a brief overview of the CALET mission and describe the analysis of the electron data. [Preview Abstract] |
Sunday, April 15, 2018 8:42AM - 8:54AM |
G15.00002: CALET Ultra Heavy Cosmic Ray Analysis Status Brian Rauch, W. Robert Binns, Yosui Akaike The CALorimetric Electron Telescope (CALET) on the International Space Station (ISS) was launched August 19, 2015 and continues to return excellent data. CALET measures the fluxes of high-energy electrons, nuclei and gamma rays with its main calorimeter (CAL). The energy spectra of the more abundant cosmic-ray (CR) nuclei through $_{26}$Fe are measured with the CAL, which also has the dynamic range to measure the abundances of CR nuclei from $_{1}$H to $_{40}$Zr. CALET has a ultra-heavy cosmic-ray (UHCR) trigger that provides an expanded geometric acceptance such that in its approved 5 year mission on the ISS CALET will collect a UHCR data set with statistics comparable to that achieved with the first flight of the SuperTIGER balloon-borne instrument in a similar energy range. Analysis of the CALET UHCR data is ongoing, but preliminary results show reasonable agreement with SuperTIGER relative abundances of even charge UHCR nuclei. The CALET space-based measurements also complement the lower statistics and lower energy space-based UHCR measurements by ACE-CRIS. [Preview Abstract] |
Sunday, April 15, 2018 8:54AM - 9:06AM |
G15.00003: Measurements of Cosmic-Ray Nuclei with CALET Yosui Akaike Launched in August 2015, the CALorimetric Electron Telescope (CALET) has been measuring high-energy cosmic rays on the International Space Station since October 2015. In addition to its primary goal to precisely measure the electron spectrum in the trans-TeV region, CALET can also measure the nuclei spectra, relative abundances and secondary-to-primary ratios to the highest energies ever directly observed to investigate details of their origin and propagation in the galaxy. The instrument consists of two layers of segmented plastic scintillators to identify the individual elements from Z=1 to 40, a 3 radiation length thick tungsten-scintillating fiber imaging calorimeter to obtain complementary charge and tracking information, and a 27 radiation length thick PWO calorimeter to measure the energy. We will report the capability of nuclei measurements with CALET including the results of charge identification using the flight data. [Preview Abstract] |
Sunday, April 15, 2018 9:06AM - 9:18AM |
G15.00004: Measurements of the Elemental Abundances of GCRs from Carbon through Zirconium by the CRIS Instrument on the ACE Spacecraft W.R. Binns, E.R. Christian, A.C. Cummings, A.J. Davis, G.A. de Nolfo, M.H. Israel, K.A. Lave, R.A. Leske, R.A. Mewaldt, E.C. Stone, T.T. von Rosenvinge, M.E. Wiedenbeck We present measurements of the elements from carbon to zirconium obtained by the CRIS instrument on NASA's ACE satellite. The data for nuclei in the charge range Z$=$29-40 corresponds to 6413 days of data collection beginning December 4, 1997 through May 24, 2016, while the data for the charge range Z$=$6-28 were taken during the solar minimum periods in solar cycles 23 and 24. The energy range of these measurements is approximately 50-600 MeV/nucleon, depending upon the atomic number of the element. Source abundances relative to iron were derived from these data and are compared to SuperTIGER and Voyager results. We find that the ordering of refractory and volatile elements is greatly improved if we compare them to a mix of massive star outflow and supernova ejecta with normal ISM, rather than pure normal ISM, and that the refractory elements are preferentially accelerated by about x4 compared to volatile elements. [Preview Abstract] |
Sunday, April 15, 2018 9:18AM - 9:30AM |
G15.00005: SuperTIGER Abundances of Galactic Cosmic-Rays for the Charge Interval Z$=$41-56 Nathan Walsh, Walter Binns, Martin Israel, Ryan Murphy, Brian Rauch, John Ward, Terri Brandt, Jason Link, John Mitchell, Thomas Hams, Kenichi Sakai, Makoto Sasaki, Allan Labrador, Richard Mewaldt, Edward Stone, Mark Wiedenbeck, Cecil Waddington The SuperTIGER (Trans-Iron Galactic Element Recorder) instrument was launched from Williams Field, Antarctica on December 8, 2012 and flew for 55 days on a long-duration balloon at a mean altitude of 125,000 feet. SuperTIGER measured the relative abundances of Galactic cosmic-ray nuclei with high statistical precision and well resolved individual element peaks in the charge range Z$=$10-40. SuperTIGER also made exploratory measurements of the relative abundances up to Z$=$56. Although the statistics are low for charges greater than Z$=$40, we will show how the relative abundances of charges Z$=$40-56 compare to those reported by HEAO3-HNE. The charge range Z$=$40-60 is of particular interest because these elements are formed both in supernova explosions and in binary neutron star mergers. A well resolved relative abundance measurement of these elements can show us how much these astrophysical events contribute to the composition of the Galactic cosmic-rays. [Preview Abstract] |
Sunday, April 15, 2018 9:30AM - 9:42AM |
G15.00006: Galactic Cosmic Ray Energy Spectra for Heavy Elements (Z$<$30) from $\sim$0.8 to $\sim$10GeV/nuc with the SuperTIGER Instrument T. J. Brandt, W. R. Binns, R. G. Bose, P. F. Dowkontt, T. Hams, M. H. Israel, A. W. Labrador, J. T. Link, R. A. Mewaldt, J. W. Mitchell, R. P. Murphy, B. F. Rauch, K. Sakai, M. Sasaki, E. C. Stone, C. J. Waddington, N.E. Walsh, J. E. Ward, M. E. Wiedenbeck SuperTIGER (Trans-Iron Galactic Element Recorder) is a large-area balloon-borne instrument built to measure the galactic cosmic ray (GCR) abundances of elements from Z=10 (Ne) through Z=56 (Ba) at energies from 0.8 to $\sim$10GeV/nuc. SuperTIGER flew for a record-breaking 55 days from Antarctica in 2012-13. We will report on the status of SuperTIGER energy calibration using the instrument's aerogel and acrylic Cherenkov detector signals and on instrumental and atmospheric corrections to obtain cosmic ray energy spectra for abundant elements (e.g. Z$<$30). The large area and long flight duration of SuperTIGER is particularly suited to looking for microquasar signatures via near monoenergetic peaks in heavy ions in the 3-10 GeV/nuc energy range. We will compare selected SuperTIGER spectra with those from ACE/CRIS and a solar-modulated GCR model during the time of the SuperTIGER flight to attempt to detect such near monoenergetic jets. [Preview Abstract] |
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