Identification of rotating and vibrating tetrahedrons in the heavy nucleus 208Pb

A. Heusler

doi:10.1140/epja/i2017-12416-1

EPJ

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2023 Impact factor 2.6

Hadrons and Nuclei

Eur. Phys. J. A (2017) 53: 215
https://doi.org/10.1140/epja/i2017-12416-1

Regular Article - Experimental Physics

Identification of rotating and vibrating tetrahedrons in the heavy nucleus ²⁰⁸Pb

A. Heusler^*

Gustav-Kirchhoff-Str. 7/1, D-69120, Heidelberg, Germany

^* e-mail: A.Heusler@mpi-hd.mpg.de

Received: 7 June 2017
Accepted: 12 October 2017
Published online: 10 November 2017

Abstract

Ten known states in the heavy nucleus ²⁰⁸Pb at $2.6 < E_{x} < 7.9$ MeV are described by rotating and vibrating tetrahedrons. The $3^{-}$ and $4^{+}$ yrast states are the first members of the rotational band. A $2^{\pm}$ doublet state with the $2^{+}$ yrast state as one member and the newly recognized $2^{-}$ yrast state as the other member, the $1^{-}$ yrast state, and the third $0^{+}$ state are the heads of the three elementary tetrahedral rotating and vibrating bands. The newly recognized state at $E_{x} = 4142$ keV was assigned spin 2 in 1975 and is suggested to have negative parity by the absent ²⁰⁸Pb $(\alpha, \alpha')$ excitation. Four more states at $5.7< E_{x}< 7.9$ MeV are identified as the next members of the three elementary tetrahedral rotating and vibrating bands. The ambiguous spin assignment to the state at $E_{x}= 7020$ keV is settled with $3^{-}$ , the state at $E_{x} = 7137$ keV is assigned $4^{-}$ .