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A new study of 25Mg(\alpha,n) 28Si angular distributions at E_{\alpha} =3-5 MeV |
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| Authors: | A Caciolli T Marchi R Depalo S Appannababu N Blasi C Broggini M Cinausero G Collazuol M Degerlier D Fabris F Gramegna M Leone P Mastinu R Menegazzo G Montagnoli C Rossi Alvarez V Rigato O Wieland |
| Institution: | 1. Departamento de Física de Partículas, Universidade de Santiago de Compostela, E-15782, Santiago de Compostela, Spain 2. GSI-Helmholtzzentrum für Schwerionenforschung GmbH, D-64291, Darmstadt, Germany 3. Institut de Physique Nucléaire, F-91406, Orsay, France 4. Centre d’Etudes Nucléaires de Bordeaux-Gradignan, CNRS/IN2P3-Université de Bordeaux, F-33175, Gradignan, France 5. GANIL, F-14076, CAEN Cedex 5, France 6. Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, D-64289, Darmstadt, Germany |
| Abstract: | Heavy neutron-rich nuclei close to N = 126 were produced by fragmentation of a 1A GeV 208Pb beam at the FRS at GSI. The β-decay half-lives of 7 nuclides have been determined using a novel numerical analysis method. The half-lives of 202,199Ir, 200,199Os and 196Re are reported for the first time. The comparison of the data with model calculations provides indications on the importance of first-forbidden transitions on the β-decay of nuclei around N = 126 and Z < 82. |
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