13-17 June 2022
Berkeley, CA
US/Pacific timezone

New evidence for alpha clustering structure in the ground state band of $^{212}$Po

14 Jun 2022, 10:10
20m
Berkeley, CA

Berkeley, CA

Lawrence Berkeley National Laboratory
Oral Oral Presentations NS2022 Plenary

Speaker

Mr Martin von Tresckow (IKP TU Darmstadt)

Description

$^{212}$Po has two-protons and neutrons outside the doubly-magic nucleus $^{208}$Pb and it may be assumed that the nuclear structure can be well described within the shell-model. But various experimental properties, such as the short-lived ground state, are better described by an $\alpha$-clustering model. The B(E2) values of the decays of the low-lying yrast states are an important finger print to describe the structure of $^{212}$Po. Especially the missing B(E2; 4$_1^+ \rightarrow$ 2$^+_1$) value is important in this discussion. We have performed an $\alpha$-transfer experiment to investigate excited states of $^{212}$Po and determine the lifetimes using the ROSPHERE $\gamma$-ray detector array at IFIN-HH in Magurele, Romania. This array consisted of 15 HPGe detectors and 10 LaBr$_3$(Ce) scintillator detectors and was supplemented with the SORCERER particle-detector array. The combination of $\gamma$-ray and the particle detectors was an important tool to determine the mean lifetimes of all ground-state band levels up to the 8$^+$ state applying the fast-timing method [Ma. von Tresckow et al., PLB 821, 136624 (2021)]. I will present our lifetime analysis and discuss the results within the shell-model and $\alpha$-clustering model. This work is financially supported by EURONS2, IFA via grant 04FAIR/2020, MCDI via grant PN19060102, UK-STFC via grant ST/P005101/1, Ministry of Science and Higher Education of the Russian Federation under contract No. 075-10-2020-117.

Primary authors

Mr Martin von Tresckow (IKP TU Darmstadt) Mr Matthias Rudigier (IKP TU Darmstadt) Mr Timur M. Shneidman (Joint Institute for Nuclear Research, Dubna) Mr Thorsten Kröll (IKP TU Darmstadt)

Co-authors

M. Boromiza (IFIN-HH, Bucharest) C. Clisu (IFIN-HH, Bucharest) C. Costache (IFIN-HH, Bucharest) D. Filipescu (IFIN-HH, Bucharest) N.M. Florea (IFIN-HH, Bucharest) I. Gheorghe (IFIN-HH, Bucharest) Kalin Gladnishki (Faculty of Physics, St. Kliment Ohridski University of Sofia) A. Ionescu (IFIN-HH, Bucharest) Diana Kocheva (Faculty of Physics, St. Kliment Ohridski University of Sofia) R. Lica (IFIN-HH, Bucharest) Nicu Marginean R. Marginean (IFIN-HH, Bucharest) Konstantin R. Mashtakov (University of Guelph) Constantin Mihai (IFIN-HH, Bucharest) R.E. Mihai (IFIN-HH, Bucharest) A. Negret (IFIN-HH, Bucharest) Cristina R. Nita (IFIN-HH, Bucharest) A. Olacel (IFIN-HH) A. Oprea (IFIN-HH, Bucharest) Sorin Pascu (University of Surrey, IFIN-HH Bucharest) Georgi Rainovski (Faculty of Physics, St. Kliment Ohridski University of Sofia) T. Sava (IFIN-HH, Bucharest) Marcus Scheck (University of the West of Scotland, Paisley) Christophe Sotty (IFIN-HH, Bucharest) Pietro Spagnoletti (Simon Fraser University, Burnaby, Canada) Lucian Stan (IFIN-HH, Bucharest) I. Stiru (IFIN-HH, Bucharest) S. Toma (IFIN-HH, Bucharest) A. Turturica (IFIN-HH) S. Ujeniuc (IFIN-HH, Bucharest)

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