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Single shot positron annihilation lifetime spectroscopy
3.We note that by incorporating a fast oscilloscope into a PALS arrangement excellent time resolution has been obtained. H. Saito, Y. Nagashima, T. Kurihara, and T. Hyodo, Nucl. Instrum. Methods Phys. Res. A 487, 612 (2002).
5.D. B. Cassidy, S. H. M. Deng, R. G. Greaves, T. Maruo, N. Nishiyama, J. B. Snyder, H. K. M. Tanaka, and A. P. Mills, Jr., Phys. Rev. Lett. 95, 195006 (2005).
10.We note that the magnitude of the ion after pulse is proportional to the primary pulse to some upper limit, after which it does not increase. We interpret this as being due to complete desorption of the hydrogen from the dynode. This suggests that it may be possible to significantly reduce this feature by using a LED light prepulse just before the main pulse. In other similar work using a much larger signal the ion after pulse in a 56 DUVP PM quickly became negligible. M. Biasini, D. B. Cassidy, S. H. M. Deng, H. K. M. Tanaka, and A. P. Mills, Jr., Nucl. Instrum. Methods Phys. Res. A 553, 550 (2005).
12.This quantity is not the actual positronium fraction because we have not accounted for the magnetic quenching effect; neither have we rigorously defined the integration regions to ensure good differentiation between two and three gamma events. Nevertheless, since the quoted “delayed fraction” is consistently defined for all data it is a useful metric.
13.See, e. g., D. W. Gidley, K. G. Lynn, M. P. Petkov, J. N. Sun, M. H. Weber, and A. F. Yee, in New Directions in Antimatter Chemistry and Physics, edited by C. M. Surko and F. A. Gianturco (Kluwer, Dordrecht, 2001), p. 151.
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