Search for mixed-symmetry states of nuclei in the vicinity of the double-magic nucleus 208Pb

D. Kocheva; R. Stegmann; G. Rainovski; J. Jolie; N. Pietralla; C. Stahl; P. Petkov; A. Blazhev; A. Hennig; C. Bauer; Th. Braunroth; M.P. Carpenter; L. Cortes; A. Dewald; M. Djongolov; C. Fransen; K. Gladnishki; R.V.F. Janssens; V. Karayonchev; M. Lettmann; C.J. Lister; J. Litzinger; Th. Möller; C. Möller-Gatermann; M. Scheck; Ph. Scholz; C. Schramm; P. Thöle; V. Werner; D. Wölk; S. Zhu; P. Van Isacker

doi:10.1051/epjconf/201610703004

Proceedings

Open Access

EPJ Web of Conferences 107, 03004 (2016)
https://doi.org/10.1051/epjconf/201610703004

Search for mixed-symmetry states of nuclei in the vicinity of the double-magic nucleus ²⁰⁸Pb

D. Kocheva¹, R. Stegmann², G. Rainovski¹^a, J. Jolie³, N. Pietralla², C. Stahl², P. Petkov⁴, A. Blazhev³, A. Hennig³, C. Bauer², Th. Braunroth³, M.P. Carpenter⁵, L. Cortes², A. Dewald³, M. Djongolov¹, C. Fransen³, K. Gladnishki¹, R.V.F. Janssens⁵, V. Karayonchev³, M. Lettmann², C.J. Lister⁵, J. Litzinger³, Th. Möller², C. Möller-Gatermann³, M. Scheck²^b, Ph. Scholz³, C. Schramm², P. Thöle³, V. Werner², D. Wölk³, S. Zhu⁵ and P. Van Isacker⁶

¹ Faculty of Physics, St. Kliment Ohridski University of Sofi, 1164 Sofia, Bulgaria
² Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
³ Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany
⁴ Bulgarian Academy of Sciences, Institute for Nuclear Research and Nuclear Energy, 1784 Sofi, Bulgaria
⁵ Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
⁶ Grand Accélérateur National d’Ions Lourds, CEA/DSM-CNRS/IN2P3, BP 55027, F-14076, Caen Cedex 5, France

^a rig@phys.uni-sofia.bg
^b Present address: University of the West of Scotland, PA1 2BE Paisley, United Kingdom and Scottish Univ. Phys. Alliance, Glasgow G12 8QQ, Scotland

Published online: 19 January 2016

Abstract

In this work we present the results from two experiments dedicated to search for quadrupolecollective isovector valence-shell excitation, the states with so-called mixed proton-neutron symmetry (MSS), in nuclei around the doubly magic nucleus ²⁰⁸Pb. ²¹²Po was studied in an α-transfer reaction. ²⁰⁴Hg was studied in an inverse kinematics Coulomb excitation reaction on a carbon target. Both experiments provide indications for existence of one-phonon MSSs. Those are the first experimentally identified MSSs in the mass A ≈ 208 region.

© Owned by the authors, published by EDP Sciences, 2016

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