Nuclear resonant scattering experiment with fast time response: new scheme for observation of 229 mTh radiative decay
Abstract
Nuclear resonant excitation of the 29.19-keV level in 229Th with high-brilliance synchrotron- radiation and detection of its decay signal, are proposed with the aim of populating the extremely low-energy isomeric state of 229Th.The proposed experiment, known as nuclear resonant scattering (NRS), has the merit of being free from uncertainties about the isomer level energy. However, it requires higher time resolution and shorter tail in the response function of the detector than that of conventional NRS experiments because of the short lifetime of the 29.19-keV state. We have fabricated an X-ray detector system which has a time resolution of 56 ps and a shorter tail function than the previously reported one. We have demonstrated an NRS experiment with the 26.27-keV nuclear level of 201Hg for feasibility assessment of the 229Th experiment. The NRS signal is clearly distinct from the prompt electronic scattering signal by the implemented detector system. The half-life of the 26.27-keV state of 201Hg is determined as 629 18 ps which is better precision by a factor three than that reported to date.
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