Low-lying states in <SUP>219</SUP>Ra and <SUP>215</SUP>Rn: Sampling microsecond α-decaying nuclei

Samark-Roth, A, Sarmiento, LG, Rudolph, D, Ljungberg, J, Carlsson, BG, Fahlander, C, Forsberg, U, Golubev, P, Ragnarsson, I, Ackermann, D
et al (show 38 more authors) (2018) Low-lying states in <SUP>219</SUP>Ra and <SUP>215</SUP>Rn: Sampling microsecond α-decaying nuclei. PHYSICAL REVIEW C, 98 (4). 044307-.

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Short-lived α-decaying nuclei "northeast" of Pb208 in the chart of nuclides were studied using the reaction Ca48+Am243 with the decay station TASISpec at TASCA, GSI Darmstadt. Decay energies and times from pile-up events were extracted with a tailor-made pulse-shape analysis routine and specific α-decay chains were identified in a correlation analysis. Decay chains starting with the even-even Ra220 and its odd-A neighbors, Fr219, and Ra221,219, with a focus on the Ra219→Rn215 decay, were studied by means of α-γ spectroscopy. A revised α-decay scheme of Ra219 is proposed, including a new decay branch from a previously not considered isomeric state at 17 keV excitation energy. Conclusions on nuclear structure are drawn from the experimental data, aided by Geant4 simulations and a discussion on theoretical calculations.

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 07 Jan 2019 16:15
Last Modified: 15 Mar 2024 07:35
DOI: 10.1103/PhysRevC.98.044307
Open Access URL: http://portal.research.lu.se/portal/files/53377004...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3030164