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Nuclear Theory·nucl-th

Friday·March 23, 2018

9 papers—2 primary·7 cross-listed

All9Primary2Cross-lists7
  1. 01

    Neutron Energy Dependence of Delayed Neutron Yields and its Assessments

    Futoshi Minato

    Incident neutron energy dependence of delayed neutron yields of uranium and plutonium isotopes is investigated. A summation calculation of decay and fission yield data is employed, and the energy dependence of the latter part is considered in a phenomenological way. Our calculation systematically reproduces the energy dependence of delayed neutron yields by introducing an energy dependence of the most probable charge and the odd-even effect. The calculated fission yields are assessed by comparison with JENDL/FPY-2011, delayed neutron activities, and decay heats. Although the fission yields in this work are optimized to delayed neutron yields, the calculated decay heats are in good agreement with the experimental data. Comparison of the fission yields calculated in this work and JENDL/FPY-2011 gave an important insight for the evaluation of the next JENDL nuclear data.

    nucl-thJ.Nucl.Sci.Tech.(2018)·3 citations
  2. 02

    Microscopic description of the ground state properties of recently reported new isotopes

    H. M. Devaraja · Y. K. Gambhir · A. Bhagwat · M. Gupta · S. Heinz · G. Münzenberg

    Microscopic investigations for the observed properties of the recently reported five unstable new isotopes are carried out. The ground state properties are calculated in the relativistic mean field (RMF) framework and the results reproduce the experiment well as expected. The {\alpha} - decay lifetimes are calculated in the double folding model using WKB approximation which requires the relevant Q values of {\alpha} - decay and the {\alpha} - daughter potential. The latter is obtained by folding the effective M3Y nucleon nucleon potential with the RMF nucleon density distributions for the daughter nucleus and that of the {\alpha} particle which is assumed to be of Gaussian shape. the corresponding decay half - lives obtained by using available phenomenological expression are also presented, discussed and compared. It is observed that the Q values calculated in the RMF framework , though reasonably agree with the experiment, are not accurate enough for the reliable WKB calculation of decay half- lives. We therefore, advocate that the use of accurate (e.g. experimental) Q values is crucial for the reliable description of the experimental {\alpha} - decay half-lives.

    nucl-th0 citations

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first authorsco-authorsvia INSPIRE