Elsevier

Physics Letters B

Volume 180, Issue 4, 20 November 1986, Pages 324-328
Physics Letters B

The probability of non-radiative decay of the 3d level in muonic 237Np

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Abstract

The X-ray spectrum of muonic 237Np has been investigated with stopped muons in a NpO2 target, containing about 10 g of 237Np. The probability of the radiationless muonic 3d→1s transition in 237Np, (9±4)%, was obtained by comparing the relative intensities of the main muonic X-ray transitions in singles and coincidence spectra. The coincidences were gated by the 2p→1s transitions.

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This work is part of the research programme of, and made financially possible by, the following institutes and financially supporting organizations: Bundesministerium für Forschung und Technologie der Bundersrepublik Deutschland, Technische Hogeschool Delft, Foundation for Fundamental Research on Matter (FOM) and the Netherlands' Organization for the Advancement of Pure Research (ZWO), Swiss National Foundation and the University of Warsaw. For preparing the target we thank Mr. K. Richter and his coworkers at the European Institute for Transuraniums, K.F.Z. Karlsruhe, W. Germany.

5

We thank Professor Dr. J.P. Blaser and his staff for the encouraging support and for the excellent working conditions at SIN.

1

Present address: Bopp und Reuther, D-6800 Mannheim, Fed. Rep. Germany

2

Present address: Physikalisch-Technische Bundesanstalt, D-3300 Braunschweig, Fed. Rep. Germany.

3

Present address: Rheinmetall GmbH, D-4000 Dusseldorf, Fed. Rep. Germany.

4

Present address: Philips I & E Laboratories, Eindhoven, The Netherlands.

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