SuperTiger Elemental Abundances for the Charge Range...

مرکز و کتابخانه مطالعات اسلامی به زبان های اروپایی

منو

" SuperTiger Elemental Abundances for the Charge Range... "
Walsh, Nathan Elliot Israel, Martin H

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	1107422
Doc. No	:	TLpq2445909487
Main Entry	:	Israel, Martin H
	:	Walsh, Nathan Elliot
Title & Author	:	SuperTiger Elemental Abundances for the Charge Range...\ Walsh, Nathan ElliotIsrael, Martin H
College	:	Washington University in St. Louis
Date	:	2020
student score	:	2020
Degree	:	Ph.D.
Page No	:	185
Abstract	:	On December 8, 2012 the SuperTIGER (Super Trans-Iron Galactic Element Recorder) instrument was launched from Williams Field, Antarctica on a long-duration balloon flight that lasted 55 days and maintained a mean altitude of 125,000 feet. SuperTIGER measured the relative abundances of Galactic cosmic-ray (GCR) nuclei with high statistical precision and well resolved individual element peaks from usd_usdNe to usd_{40}usdZr. SuperTIGER also made exploratory measurements of the relative abundances up to usd_{56}usdBa. The SuperTIGER instrument determines the charge (usdZusd) and energy of GCR using two independent detector stacks composed of a scintillating fiber hodoscope, two Cherenkov light detectors and three scintillation light detectors. The SuperTIGER data is analyzed to account for instrument effects and then corrected for nuclear interactions and energy losses that occur within the instrument, atmosphere and interstellar medium to obtain relative abundances at the GCR source. The SuperTIGER data analysis reported in Murphy et al. 2016\cite{Murphyetal:2016} was performed prior to the Antarctic recovery effort in 2015 and only included data transmitted during line-of-site periods and via satellite telemetry. The current analysis includes additional data saved to on-board solid-state drives that were retrieved during recovery. Although the statistics are low for elements heavier than usd_{40}usdZr, we show relative abundances of charges usd41\leq Z\leq56usd with individual element resolution. The relative abundances of elements usd_{40}usdZr through usd_{60}usdNd are of particular interest because they are likely formed both by supernova explosions and binary neutron star mergers. A well resolved measurement of this charge range can constrain the contributions to the GCR composition from both these possible sources. The GCR relative elemental abundances derived in this thesis are compared to satellite measurements after accounting for the effects of traversing the instrument and atmosphere. Further work is required to accurately constrain the GCR source composition up to usd_{56}usdBa.
Subject	:	Astrophysics
	:	Cosmic rays
	:	Neutron stars
	:	Physics
	:	Supernovae