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Ring focus detection in a thin lens nuclear spectrometer

University of British Columbia

A thin lens nuclear spectrometer has been modified by the use of ring focus detection. The transmission of this spectrometer has been increased by a factor of 6 with no appreciable loss, in resolution. An examination of the beta spectrum of Eu[superscript 152,154] has been carried out with this instrument. Internal conversion lines of 74.6, 115.5, 198.3, 242.7, 295.9 and 339.3 Kev were found. These lines have been assigned to a 122 Kev transition in Sm or a 124 Kev transition in Gd, a 245 Kev transition in Sm and a 346 Kev transition in Gd. The K-to-L ratios of the 245 and 346 transitions have been measured and were found to be 2 and 4 respectively. A Fermi plot of the beta spectrum has been made and end-points of 1450, 1060 and 675 Kev. were found. Also, some indication of a lower energy beta group was found. Estimates of the comparative lifetimes of the 1450, 1060 and 675 Kev beta transitions place all of them as second (or higher) forbidden.

Text

2012-02-07

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http://hdl.handle.net/2429/40523

Physics

University of British Columbia

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