Zobrazeno 1 - 10
of 89
pro vyhledávání: '"Chirayath, V."'
We present results from the characterization of a vertically stacked amorphous selenium (aSe)-based photodetector for use in cryogenic environments. aSe has been identified as an ideal photoconductor that can efficiently convert vacuum ultraviolet (V
Externí odkaz:
http://arxiv.org/abs/2411.08823
Autor:
Lotfimarangloo, S., Chirayath, V. A., Sterne, P. A., Mahdy, H., Gladen, R. W., Driscoll, J., Rooks, M., Chrysler, M., Koymen, A. R., Asaadi, J., Weiss, A. H.
We present measurements and theoretical modeling demonstrating the capability of Doppler Broadened annihilation gamma Spectroscopy (DBS) to provide element-specific information from the topmost atomic layer of surfaces that are either clean or covere
Externí odkaz:
http://arxiv.org/abs/2401.00581
Autor:
Lotfimarangloo, S., Chirayath, V. A., Mukherjee, S., Akafzade, H., Fairchild, A. J., Gladen, R. W., Koymen, A. R., Weiss, A. H.
Magnetic bottle Time-of-Flight (ToF) spectrometers can measure the energy spectra of all electrons emitted into a 2$\pi$ sr solid angle simultaneously, greatly reducing data collection time. When the detection of the annihilation gamma ($\gamma$) and
Externí odkaz:
http://arxiv.org/abs/2303.14287
Autor:
Gladen, R. W., Chirayath, V. A., Sterne, P. A., Fairchild, A. J., Koymen, A. R., Weiss, A. H.
We present a novel method for the analysis of the Doppler broadened spectrum of gamma photons emitted following the annihilation of surface trapped positrons with the electrons of bilayer graphene supported on polycrystalline Cu substrate. The method
Externí odkaz:
http://arxiv.org/abs/2007.13938
We describe here an efficient machine-learning based approach for the optimization of parameters used for extracting the arrival time of waveforms, in particular those generated by the detection of 511 keV annihilation gamma-rays by a 60 cm3 coaxial
Externí odkaz:
http://arxiv.org/abs/2004.00008
Autor:
Chirayath, V. A., Gladen, R. W., McDonald, A. D., Fairchild, A. J., Joglekar, P. V., Satyal, S., Lim, Z. H., Shead, T. N., Chrysler, M. D., Mukherjee, S., Barnett, B. M., Byrnes, N. K., Koymen, A. R., Greaves, R. G., Weiss, A. H.
Here we describe an advanced multi functional, variable-energy positron beam system capable of measuring the energies of multiple positron-induced electrons in coincidence with the Doppler-shifted gamma photon resulting from the annihilation of the c
Externí odkaz:
http://arxiv.org/abs/2001.10145
In this paper, we present and analyze measurements of the positron induced electron spectra (PIES) from highly oriented pyrolytic graphite (HOPG). The spectra were obtained using a time of flight spectrometer attached to a variable energy positron be
Externí odkaz:
http://arxiv.org/abs/1907.11285
Preliminary results are presented from a new positron beam system currently under development at the University of Texas at Arlington for the coincident energy measurement of Doppler-shifted annihilation quanta and positron-induced Auger electrons. W
Externí odkaz:
http://arxiv.org/abs/1907.10582
Autor:
Weiss, A. H., Chirayath, V. A., Gladen, R. W., Fairchild, A. J., Chrysler, M. D., Sterne, P. A., Koymen, A. R.
We present Doppler broadened gamma spectra, obtained using the newly developed advanced positron beam at the University of Texas at Arlington, from a sample consisting of 6 to 8 layers of graphene (MLG) on polycrystalline Cu. The kinetic energy of th
Externí odkaz:
http://arxiv.org/abs/1907.10579
Autor:
Chirayath, V. A., Fairchild, A. J., Gladen, R. W., Chrysler, M. D., Koymen, A. R., Weiss, A. H.
Positronium (Ps) formation on the surface of clean polycrystalline copper (Cu), highly oriented pyrolytic graphite (HOPG) and multi layer graphene (MLG) grown on a polycrystalline copper substrate has been investigated as a function of incident posit
Externí odkaz:
http://arxiv.org/abs/1907.10573