Evidence of octupole-phonons at high spin in Pb-207
Author
Jungclaus, A.
Gadea, A.
JOHN, P. R.
KOCHEVA, D.
KONSTANTINOPOULOS, T.
KORICHI, A.
LENZI, S. M.
Leoni, S.
LOZEVA, R.
MAJ, A.
PEREZ, R.
PIETRALLA, N.
Shand, C.
Stezowski, O.
WILMSEN, D.
Yordanov, D.
BARRIENTOS, D.
BEDNARCZYK, R.
Birkenbach, B.
Boston, A. J.
Boston, H. C.
BURROWS, I.
Cederwall, B.
CIEMALA, M.
COLLADO, J.
CRESPI, F.
Cullen, D.
EBERTH, H. J.
Ralet, D.
CLEMENT, E.
Georgiev, G.
Stuchbery, A. E.
REJMUND, M.
VAN ISACKER, R.
DE FRANCE, G.
LEMASSON, A.
Ljungvall, J.
Michelagnoli, C.
NAVIN, A.
BALABANSKI, D. L.
Atanasova, L.
BLAZHEV, A.
BOCCHI, G.
Carroll, R.
GOUPIL, J.
Harkness, L.
Hess, H.
Korten, W.
Labiche, M.
Menegazzo, R.
Mengoni, D.
Million, B.
Nyberg, J.
Podolyak, Zs
PULLIA, A.
QUINTANA ARNES, B.
Recchia, F.
REITER, R.
SAILLANT, F.
SALSAC, M. D.
SANCHIS, E.
THEISEN, C.
DOBON, J. J. Valiente
Wieland, O.
Kusoglu, Aslı
Dudouet, J.
DUPONT, E.
FORNA, B.
Franchoo, S.
Fransen, C.
MUELLER-GATERMANN, C.
Goasduff, A.
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Show full item recordAbstract
A lifetime measurement of the 19/2(-) state in Pb-207 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 Pb-208 beam impinging on a Mo-100 enriched target. The beam-like nuclei were detected and identified in terms of their atomic mass number in the VAMOS++ spectrometer while the prompt gamma 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 Pb-207. An analysis in terms of a particle-octupole-vibration coupling model indicates that the measured B(E3) value in Pb-207 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. Crown Copyright (C) 2019 Published by Elsevier B.V.
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