Nuclear Charge Radii of Neutron-Deficient Lead Isotopes Beyond<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>104</mml:mn></mml:math>Midshell Investigated by In-Source Laser Spectroscopy
H. De WitteInstituut voor Kern- en Stralingsfysica, K.U. Leuven, B-3001 Leuven, BelgiumA. N. AndreyevTRIUMF, Vancouver BC, V6T 2A3, CanadaNicole BarréInstitut de Physique Nucle ´aire, F-91406 Orsay Cedex, FranceM. BenderDAPNIA/SPhN, CEA Saclay, F-91191 Gif-sur-Yvette Cedex, FranceT. E. CocoliosNuclear PhysicsS. DeanInstituut voor Kern-en Stralingsfysica, K.U. Leuven, B-3001 Leuven BelgiumД. В. ФедоровPetersburg Nuclear Physics Institute, 188350 Gatchina, RussiaV. N. FedoseyevISOLDE, CERN, CH-1211 Gene `ve 23, SwitzerlandL. M. FraileISOLDE, CERN, CH-1211 Gene `ve 23, SwitzerlandS. FranchooInstitut fu ¨r Physik, Johannes Gutenberg Universita ¨t, D-55099 Mainz, GermanyV. HellemansVakgroep Subatomaire en Stralingsfysica, University of Gent, B-9000 Gent, BelgiumP.-H. HeenenService de Physique Nucle ´aire The ´orique, Universite ´Libre de Bruxelles, B-1050 Bruxelles, BelgiumK. HeydeVakgroep Subatomaire en Stralingsfysica, University of Gent, B-9000 Gent, BelgiumGeorge W. HuberInstitut fu ¨r Physik, Johannes Gutenberg Universita ¨t, D-55099 Mainz, GermanyM. HuyseInstituut voor Kern-en Stralingsfysica, K.U. Leuven, B-3001 Leuven BelgiumH. JeppessenISOLDE, CERN, CH-1211 Gene `ve 23, SwitzerlandU. KösterService de Physique Nucle ´aire The ´orique, Universite ´Libre de Bruxelles, B-1050 Bruxelles, BelgiumP. KunzInstitut fu ¨r Physik, Johannes Gutenberg Universita ¨t, D-55099 Mainz, GermanyS. R. LesherInstituut voor Kern-en Stralingsfysica, K.U. Leuven, B-3001 Leuven BelgiumB. A. MarshISOLDE, CERN, CH-1211 Gene `ve 23, SwitzerlandI. MukhaInstituut voor Kern-en Stralingsfysica, K.U. Leuven, B-3001 Leuven BelgiumB. RoussièreISOLDE, CERN, CH-1211 Gene `ve 23, SwitzerlandJ. SauvageInstitut de Physique Nucle ´aire, F-91406 Orsay Cedex, FranceM. D. SeliverstovPetersburg Nuclear Physics Institute, 188350 Gatchina, RussiaI. ŞtefânescuInstituut voor Kern-en Stralingsfysica, K.U. Leuven, B-3001 Leuven BelgiumE. TengbornChalmers University of Technology, SE-412 96 Go ¨teborg, SwedenK. Van de VelInstituut voor Kern-en Stralingsfysica, K.U. Leuven, B-3001 Leuven BelgiumJ. Van de WalleInstituut voor Kern-en Stralingsfysica, K.U. Leuven, B-3001 Leuven BelgiumP. Van DuppenInstituut voor Kern-en Stralingsfysica, K.U. Leuven, B-3001 Leuven BelgiumYu. M. VolkovPetersburg Nuclear Physics Institute, 188350 Gatchina, Russia
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The shape of exotic even-mass (182-190)Pb isotopes was probed by measurement of optical isotope shifts providing mean square charge radii (delta(r(2))). The experiment was carried out at the isolde (cern) on-line mass separator, using in-source laser spectroscopy. Small deviations from the spherical droplet model are observed, but when compared to model calculations, those are explained by high sensitivity of delta(r(2)) to beyond mean-field correlations and small admixtures of intruder configurations in the ground state. The data support the predominantly spherical shape of the ground state of the proton-magic Z=82 lead isotopes near neutron midshell (N=104).
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