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

Published online by Cambridge University Press:  12 July 2004

A. Jorissen ,
S. Goriely ,
M. Rayet ,
L. Siess ,
H. Boffin ,
Y. Motizuki ,
T. Tachibana ,
S. Goriely  and
H. Koura
Y. Motizuki
Affiliation:
RIKEN, Hirosawa 2-1, Wako 351-0198, Japan
T. Tachibana
Affiliation:
Senior High School of Waseda University, Kami-Shakujii 3-31-1, Nerima-ku, Tokyo 177-0044, Japan Advanced Research Institute for Science and Engineering, Waseda University, Okubo 3-4-1, Shinjuku-ku, Tokyo 169-8555, Japan
S. Goriely
Affiliation:
Institut d'Astronomie et d'Astrophysique, Université Libre de Bruxelles, CP 226, 1050 Bruxelles, Belgium
H. Koura
Affiliation:
RIKEN, Hirosawa 2-1, Wako 351-0198, Japan Advanced Research Institute for Science and Engineering, Waseda University, Okubo 3-4-1, Shinjuku-ku, Tokyo 169-8555, Japan
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Abstract

In order to understand the r-process nucleosynthesis, we evaluate theprecision required for mass and β-decayhalf-life measurements planned at future radioactive-ion-beamfacilities. To satisfy a simple requirement that we put on nuclearmodel predictions, it is concluded that the detectors for the massmeasurements must have a precision of 1σ < ~ 250 keV,and that the detectors for the half-life measurementsdemand a precision of 1σ< ~ 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 shellclosure. For the doubly magic nuclide 78Ni, a precision of 1σ< ~ 300 keV and 1σ< ~ 5 ms are required, respectively, for mass and half-life measurements.This analysis aims at providing a first rough guide for ongoing detectordevelopments.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 11: The Future Astronuclear Physics , 2004 , pp. 227 - 234
Copyright
© EAS, EDP Sciences, 2004

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