Production and Beta Half Lives of Nuclei Close TI the Nucleosynthesis R-Process Path at N=126

• Published in: AIP Conference Proceedings
• Main Authors: Benlliure, J., Caamaño, M., Casarejos, E., Cortina, D., Kurtukian Nieto, T., F. Ordoñez, M., Pereira, J., Becker, F., Henzlova, D., Jurado, B., Schmidt, K.-H., Yordanov, O., Audouin, L., Rejmund, F.
• Other Authors: Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Yu. E. Penionzhkevich, E. A. Cherepanov
• Format: Conference Object
• Language: English
• Published: HAL CCSD 2006
• Subjects: heavy ion-nucleus reactions; lead; nuclei with mass number 190 to 219; radioactive decay periods; nuclear fragmentation; 25.70.Mn; 27.80.+w; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]; khanty
• Online Access: https://hal.in2p3.fr/in2p3-00158777; https://doi.org/10.1063/1.2746608

International audience Cold-fragmentation reactions of $^{208}$Pb projectiles impinging a beryllium target at 1 A GeV have been used to produce more than 190 nuclei “south” of lead, 25 of them for the first time. The beta half lives or upper limits of 13 of these new nuclei have been determined using position and time correlations between the nuclei and the betas in an active stopper. The measured half lives can only be described when first forbidden transitions are considered.