Isomeric decays in 126 Cd, 128 Cd, 130 Cd. s

1. Solar abundances reproduced by models which included shell quenching in the calculations. Possible causes: Monopole migration of the SPE levels in nuclei with extreme N/Z ratio Not predicted by LSSM calculations Diffuseness of the shape of the nuclear potential due to the neutron excess Predicted in HFB calculations with Skyrme force in 122Zr Experimental evidences: Flattening of the Cd 2+ systematics in 126Cd and 128Cd. Possible onset of collectivity. Large Qβvalue in 130Cd only reproduced by mass models which included N = 82 shell quenching and indication of a low lying 2+ state at energy of 937 keV. LSSM calculations 130Cd SM-1: π( p1/2, s, d, g ) ν ( g7/2, s d, h11/2 ) SM-2: π ( p1/2, g9/2 ) ν ( g7/2, s d, h11/2 ) 88Sr core Summary & Conclusions : -The 8+ seniority isomer in 130Cd and its decay has been measured for the first time and no evidence for N=82 shell quenching at Z=48 was observed. -Three isomeric states have been identified in 128Cd. The level scheme was constructed unambiguously based on the γγ coincidence and lifetime analysis performed for the first time in this nucleus. The isomeric decay pattern is selective to the structure of the populated states and their leading π or ν configuration. -Five new γ transitions have been observed in the isomeric decay of 126Cd. Half-life and coincidence analysis was performed for the first time in this nucleus. The γγ coincidence analysis reveal the existence of two competing branches depopulating the level at 4507 keV although the ordering of the transitions between that level and the one at energy of 2439 keV could not be established due to the non observation of linking transitions between the two branches and/or prompt character of the transitions below the isomer. L. Cáceres1,2, M. Górska1, A. Jungclaus2,3, M. Pfützner4, H. Grawe1, F. Nowacki5, K. Sieja1, S. Pietri3, D. Rudolph7, Zs. Podolyák6, P. H. Regan6, E. Werner-Maleto4, P. Detistov8, S. Lalkovski8,9, V. Modamio2, J. Walker2, K. Andgreg10, P. Bednarczyk1,11, J. Benlliure12, G. Benzoni13, A.M. Bruce9, E. Casarejos12, B. Cederwall10, F. C. L. Crespi13, P. Doornenbal1,15, H. Geissel1, J. Gerl1, J. Grębosz1,14, B. Hadinia10, M. Hellström7, R. Hoischen1,7, G. Ilie15, A. Khaplanov10, M. Kmiecik11, I. Kojouharov1, R. Kumar16, N. Kurz1, K. Langanke1, A. Maj11, S. Mandal17, F. Montes1, G. Martínez-Pinedo1, S. Myalski11, W. Prolopowicz1, H. Schaffner1, G. Simpson18, S. J. Steer6, S. Tashenov1, O. Wieland13 and H. –J. Wollersheim1 7 Department of Physics, Lund University, S-22100 Lund, Sweden 8 Faculty of Physics, University of Sofia, BG-1164 Sofia, Bulgaria 9 School of Engineering, University of Brighton, Brighton, BN2 4GJ, UK 10 KTH Stockholm, S-10691 Stockholm, Sweden 11 The Henryk Niewodniczański Institute of Nuclear Physics, PL-31342 Kraków, Poland 12 Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain 1 Gesellschaft für Schwerionenforschung (GSI), D-64291 Darmstadt, Germany 2 Departamento de Física Teórica, Universidad Autonoma de Madrid, E-29049 Madrid, Spain 3 Instituto de estructure de la Materia, CSIC, Serrano 113 bis, E-28006 Madrid, Spain 4 IEP, Warsaw University, PL-00681 Warsaw, Poland 5 IReS, IN2P3-CNRS / University Louis Pasteur, F-67037, Strasbourg, France 6 Department of Physics, University of Surrey, Guildford, GU2 7XH, UK 13 INFN, Universitádegli Studi di Milano and INFN sezione di Milano, I-20133 Milano, Italy 14 The Henryk Niewodniczański Institute of Nuclear Physics, PAN, 31-342 Kraków, Poland 15 Institut für Kernphysik, Universität zu Köln, Germany 16 Inter University Accelerator Centre, New Delhi, India 17 LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France Isomeric decays in 126Cd, 128Cd, 130Cd.s 128Cd 126Cd T1/2= 1720(70) ns 130Cd SM-1 SM-2 126,128Cd π ( p, f5/2, g9/2 ) ν ( g7/2, d, s1/2, h11/2 ) 78Ni core LSSM 126Cd LSSM 128Cd