β-Decay Half-Lives of Very Neutron-Rich Kr to Tc Isotopes on the Boundary of the r-Process Path: An Indication of Fast r-Matter Flow

S. Nishimura et al.
Phys. Rev. Lett. 106, 052502 – Published 3 February 2011

Abstract

The β-decay half-lives of 38 neutron-rich isotopes from Kr36 to Tc43 have been measured; the half-lives of Kr100, Sr103105, Y106108, Zr108110, Nb111,112, Mo112115, and Tc116,117 are reported here. The results when compared with previous standard models indicate an overestimation in the predicted half-lives by a factor of 2 or more in the A110 region. A revised model based on the second generation gross theory of β decay better predicts the measured half-lives and suggests a more rapid flow of the rapid neutron-capture process (r-matter flow) through this region than previously predicted.

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  • Received 15 October 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.052502

© 2011 American Physical Society

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Vol. 106, Iss. 5 — 4 February 2011

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