Precision mass measurements on neutron-rich Zn isotopes and their consequences on the astrophysical r-process [Elektronische Ressource] / vorgelegt von Sudarshan Baruah

Precision mass measurements on neutron-rich Zn isotopes andtheir consequences on the astrophysical r-processInaguraldissertationzurErlangung des akademischen Gradesdoctor rerum naturalium (Dr. rer. nat.)an der Mathematisch-Naturwissenschaftlichen FakultatderErnst-Moritz-Arndt-Universitat Greifswaldvorgelegt vonSudarshan Baruahgeboren 1. Feb. 1980in Darrang, IndienGreifswald, July 2008Dekan: Prof. Dr. K. Fesser1. Gutachter: Prof. Dr. L. Schweikhard2. Gutachter: Prof. Dr. G. WerthTag der Promotion: 17.10.2008AbstractThe rapid neutron-capture or the r-process is responsible for the origin of about halfof the neutron-rich atomic nuclei in the universe heavier than iron. For the calculationof the abundances of those nuclei, atomic masses are required as one of the inputparameters with very high precision. In the present work, the masses of the neutron-rich Zn isotopes (A = 71 to 81) lying in the r-process path have been measured in81the ISOLTRAP experiment at ISOLDE/CERN. The mass of Zn has been72directly for the rst time. The half-lives of the nuclides ranged from 46.5 h ( Zn) down81to 290 ms ( Zn). In case of all the nuclides, the relative mass uncertainty ( m=m)8achieved was in the order of 10 corresponding to a 100-fold improvement in precisionover previous measurements.ContentsAbstract v1 Introduction 12 The r-process in nucleosynthesis and precision mass measurements 32.1 Nucleosynthesis . . . . . . . . . . . . . . . . . . . . . . . . .