학술논문
Evidence of octupole-phonons at high spin in 207Pb
Document Type
article
Author
D. Ralet; E. Clément; G. Georgiev; A.E. Stuchbery; M. Rejmund; 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; P.R. John; D. Kocheva; T. Konstantinopoulos; A. Korichi; A. Kusoglu; S.M. Lenzi; S. Leoni; R. Lozeva; A. Maj; R. Perez; N. Pietralla; C. Shand; O. Stezowski; D. Wilmsen; D. Yordanov; D. Barrientos; P. Bednarczyk; B. Birkenbach; A.J. Boston; H.C. Boston; I. Burrows; B. Cederwall; M. Ciemala; J. Collado; F. Crespi; D. Cullen; H.J. Eberth; J. Goupil; L. Harkness; 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
Source
Physics Letters B, Vol 797, Iss , Pp - (2019)
Subject
Language
English
ISSN
0370-2693
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. Keywords: AGATA spectrometer, γ-Ray tracking, VAMOS++ spectrometer, Plunger device, Nuclear deformation, Octupole phonon