EAS Publications Series

Issue		EAS Publications Series Volume 11, 2004 The Future Astronuclear Physics
Page(s)		227 - 234
DOI		10.1051/eas:2004016

The Future Astronuclear Physics
A. Jorissen, S. Goriely, M. Rayet, L. Siess and H. Boffin (eds)
EAS Publications Series, Vol. 11, 2004
DOI: 10.1051/eas:2004016

Required precision of mass and half-life measurements for r-process nuclei planned at future radioactive-ion-beam facilities

Y. Motizuki¹, T. Tachibana^{2, 3}, S. Goriely⁴ and H. Koura^{1, 3}

¹ RIKEN, Hirosawa 2-1, Wako 351-0198, Japan
² Senior High School of Waseda University, Kami-Shakujii 3-31-1, Nerima-ku, Tokyo 177-0044, Japan
³ Advanced Research Institute for Science and Engineering, Waseda University, Okubo 3-4-1, Shinjuku-ku, Tokyo 169-8555, Japan
⁴ Institut d'Astronomie et d'Astrophysique, Université Libre de Bruxelles, CP 226, 1050 Bruxelles, Belgium

Abstract
In order to understand the r-process nucleosynthesis, we evaluate the precision required for mass and $\beta$ -decay half-life measurements planned at future radioactive-ion-beam facilities. To satisfy a simple requirement that we put on nuclear model predictions, it is concluded that the detectors for the mass measurements must have a precision of 1 $\sigma$ < ~ $\;$ 250 keV, and that the detectors for the half-life measurements demand a precision of 1 $\sigma$ < ~ $\;$ 0.15 ms. The above two specifications are required at the neutron richness of A/Z = 3.0 at the N=82 shell closure and A/Z = 2.9 at the N=50 shell closure. For the doubly magic nuclide ⁷⁸Ni, a precision of 1 $\sigma$ < ~ $\;$ 300 keV and 1 $\sigma$ < ~ $\;$ 5 ms are required, respectively, for mass and half-life measurements. This analysis aims at providing a first rough guide for ongoing detector developments.

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