## Abstract

The neutron capture cross section of the unstable nucleus W-185 has been derived from experimental photoactivation data of the inverse reaction W-186(gamma, n) W-185. The new result of sigma = 687 +/- 110 mbarn confirms the theoretically predicted neutron capture cross section of W-185 of sigma approximate to 700 mbarn at kT = 30 keV. A neutron density in the classical s-process of n(n) = (3.8(-0.9)(+1.1)) x 10(8) cm(-3) is derived from the new data for the W-185 branching. In a stellar s-process model, one finds a significant overproduction of the residual s-only nucleus Os-186.

Original language | English |
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Pages (from-to) | 506-513 |

Number of pages | 8 |

Journal | The Astrophysical Journal |

Volume | 583 |

Issue number | 1 |

Publication status | Published - 20 Jan 2003 |

## Keywords

- GAMMA-PROCESS
- STATISTICAL-MODEL CALCULATIONS
- R-PROCESS
- PHOTONEUTRON CROSS-SECTIONS
- methods : laboratory
- NUCLEAR-LEVEL DENSITY
- ASTROPHYSICAL REACTION-RATES
- nuclear reactions, nucleosynthesis, abundances
- NUCLEOSYNTHESIS
- HALF-LIVES
- NEUTRON-CAPTURE
- ASYMPTOTIC GIANT BRANCH