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oai:docta.ucm.es:20.500.14352/883492024-09-24T16:06:54Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Verlinde, M author Kraemer, S. author Moens, J. author Fraile Prieto, Luis Mario author Wilkins, S. G. author 2019-08-12 A new approach to observe the radiative decay of the ^229 Th nuclear isomer, and to determine its energy and radiative lifetime, is presented. Situated at a uniquely low excitation energy, this nuclear state might be a key ingredient for the development of a nuclear clock or a nuclear laser and, the search for time variations of fundamental constants like the fine structure constant. The isomer's gamma decay towards the ground state will be studied with a high-resolution vacuum ultraviolet (VUV) spectrometer after its production by the beta decay of ^Ac 229. The novel production method presents a number of advantages asserting its competitive nature with respect to the commonly used ^U 233 alpha-decay recoil source. In this paper, a feasibility analysis of this new concept, and an experimental investigation of its key ingredients, using a pure ^Ac 229 ion beam produced at the ISOLDE radioactive beam facility, is reported. 2469-9985 10.1103/PhysRevC.100.024315 https://hdl.handle.net/20.500.14352/88349 2469-9993 https://journals.aps.org/prc/abstract/10.1103/PhysRevC.100.024315 Alternative approach to populate and study the ^229 Th nuclear clock isomer