Evidence of octupole-phonons at high spin in 207Pb



Ralet, D, Clément, E, Georgiev, G, Stuchbery, AE, Rejmund, M, Van Isacker, P, de France, G, Lemasson, A, Ljungvall, J, Michelagnoli, C
et al (show 62 more authors) (2019) Evidence of octupole-phonons at high spin in 207Pb. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 797.

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Abstract

© 2019 A lifetime measurement of the 19/2− state in 207Pb has been performed using the Recoil Distance Doppler-Shift (RDDS) method. The nuclei of interest were produced in multi-nucleon transfer reactions induced by a 208Pb beam impinging on a 100Mo enriched target. The beam-like nuclei were detected and identified in terms of their atomic mass number in the VAMOS++ spectrometer while the prompt γ rays were detected by the AGATA tracking array. The measured large reduced transition probability B(E3,19/2−→13/2+)=40(8) W.u. is the first indication of the octupole phonon at high spin in 207Pb. An analysis in terms of a particle-octupole-vibration coupling model indicates that the measured B(E3) value in 207Pb is compatible with the contributions from single-phonon and single particle E3 as well as E3 strength arising from the double-octupole-phonon 6+ state, all adding coherently. A crucial aspect of the coupling model, namely the strong mixing between single-hole and the phonon-hole states, is confirmed in a realistic shell-model calculation.

Item Type: Article
Uncontrolled Keywords: AGATA spectrometer, γ-Ray tracking, VAMOS++ spectrometer, Plunger device, Nuclear deformation, Octupole phonon
Depositing User: Symplectic Admin
Date Deposited: 08 Aug 2019 15:51
Last Modified: 09 Jan 2021 03:21
DOI: 10.1016/j.physletb.2019.134797
Open Access URL: https://doi.org/10.1016/j.physletb.2019.134797
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3051300