Evidence of octupole-phonons at high spin in 207Pb

Research output: Contribution to journalArticle

  • Authors:
  • D. Ralet
  • E. Clément
  • G. Georgiev
  • A. E. Stuchbery
  • M. Rejmund
  • And 61 others
  • External authors:
  • P. Van Isacker
  • G. de France
  • A. Lemasson
  • J. Ljungvall
  • C. Michelagnoli
  • A. Navin
  • D. L. Balabanski
  • L. Atanasova
  • A. Blazhev
  • G. Bocchi
  • R. Carroll
  • J. Dudouet
  • E. Dupont
  • B. Fornal
  • S. Franchoo
  • C. Fransen
  • C. Müller-Gatermann
  • A. Goasduff
  • A. Gadea
  • D. Kocheva
  • T. Konstantinopoulos
  • A. Korichi
  • A. Kusoglu
  • S. M. Lenzi
  • S. Leoni
  • R. Lozeva
  • A. Maj
  • N. Pietralla
  • O. Stezowski
  • D. Wilmsen
  • D. Yordanov
  • D. Barrientos
  • P. Bednarczyk
  • B. Birkenbach
  • A. J. Boston
  • H. C. Boston
  • B. Cederwall
  • M. Ciemala
  • J. Collado
  • H. J. Eberth
  • J. Goupil
  • H. Hess
  • A. Jungclaus
  • W. Korten
  • M. Labiche
  • R. Menegazzo
  • D. Mengoni
  • B. Million
  • J. Nyberg
  • Zs Podolyák
  • A. Pullia
  • B. Quintana Arnés
  • F. Recchia
  • P. Reiter
  • F. Saillant
  • M. D. Salsac
  • E. Sanchis
  • C. Theisen
  • J. J. Valiente Dobon
  • O. Wieland
  • David Cullen

Abstract

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.

Bibliographical metadata

Original languageEnglish
Article number134797
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume797
Early online date24 Jul 2019
DOIs
Publication statusPublished - 10 Oct 2019