2026-06-27T16:27:01Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/84322023-08-27T03:06:34Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Fraile Prieto, Luis Mario author Vedia Fernández, María Victoria author otros, ... author 2021-05-21 The structure of Po-208 populated through the EC/beta(+) decay of At-208 is investigated using gamma-ray spectroscopy at the ISOLDE Decay Station. The presented level scheme contains 27 new excited states and 43 new transitions, as well as a further 50 previously observed. rays which have been (re)assigned a position. The level scheme is compared to shell model calculations. Through this analysis approximately half of the beta-decay strength of At-208 is found to proceed via allowed decay and half via first-forbidden decay. The first-forbidden transitions predominantly populate core excited states at high excitation energies, which is qualitatively understood using shell model considerations. This mass region provides an excellent testing ground for the competition between allowed and first-forbidden beta-decay calculations, important for the detailed understanding of the nucleosynthesis of heavy elements. 2469-9985 10.1103/PhysRevC.103.054327 https://hdl.handle.net/20.500.14352/8432 https://doi.org/10.1103/PhysRevC.103.054327 https://journals.aps.org/ Competition between allowed and first-forbidden beta decays of At-208 and expansion of the Po-208 level scheme