ScienceDirect - Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms : Rare isotope discoveries with digital electronics

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Volume 261, Issues 1-2, August 2007, Pages 1103-1106
The Application of Accelerators in Research and Industry - Proceedings of the Nineteenth International Conference on The Application of Accelerators in Research and Industry, Nineteenth International Conference on The Application of Accelerators in Research and Industry

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doi:10.1016/j.nimb.2007.04.234

Rare isotope discoveries with digital electronics

R. Grzywacz^a^,^b^,^,, C.J. Gross^b, A. Korgul^a^,^c^,^d^,^e, S.N. Liddick^f, C. Mazzocchi^a, R.D. Page^g and K. Rykaczewski^b

^aDepartment of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996-1200, USA ^bORNL, Physics Division, Oak Ridge, TN 37830, USA ^cInstitute of Experimental Physics, Warsaw University, Warszawa PL 00-681, Poland ^dJoint Institute for Heavy-Ion Research, Oak Ridge, TN 37831, USA ^eDepartment of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235, USA ^fUNIRIB, Oak Ridge Associated Universities, Oak Ridge, TN 37831, USA ^gDepartment of Physics, University of Liverpool, Liverpool L69 7ZE, UK

Available online 4 May 2007.

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Abstract

The discovery of the new isotopes ¹⁰⁹Xe and ¹⁰⁵Te was enabled by the application of a new experimental method using selective pulse shape storage from silicon detectors with digital signal processing electronics. Essential data processing algorithms were developed, which are able to find unique nuclear decay signatures, such as overlapping alpha decay induced signals. An experiment using this method led to the simultaneous detection of isotopes with dramatically different half lives T_1/2(¹⁰⁹Xe) = 13(2) ms and T_1/2(¹⁰⁵Te) = 620(70) ns. The ground state decay energies have been measured to be E_α(¹⁰⁹Xe) = 4062(7) keV and E_α(¹⁰⁵Te) = 4703(5) keV via observation of correlated events in the decay chain ¹⁰⁹Xe → ¹⁰⁵Te → ¹⁰¹Sn.