$s$-process branching at $^{185}\mathrm{W}$ revised

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$s$ -process branching at ${}^{185}W$ revised

P. Mohr, T. Shizuma, H. Ueda, S. Goko, A. Makinaga, K. Y. Hara, T. Hayakawa, Y.-W. Lui, H. Ohgaki, and H. Utsunomiya

Phys. Rev. C 69, 032801(R) – Published 29 March 2004

Abstract

The neutron capture cross section of the unstable $s$ -process branching nucleus ${}^{185}W$ has been derived from experimental data of the inverse ${}^{186}W (γ, n) {}^{185}W$ photodisintegration taken with monochromatic photon beams from laser Compton scattering. The result of $σ = 553 \pm 60 mb$ at $k T = 30 keV$ leads to a relatively high effective neutron density in the classical $s$ process of $N_{n} = 4.7 \times 10^{8} {cm}^{- 3}$ . A realistic model for the $s$ process in thermally pulsing asymptotic giant branch stars overestimates the abundance of ${}^{186}{Os}$ significantly because of the relatively small neutron capture cross section of ${}^{185}W$ .

Received 3 February 2004

DOI:https://doi.org/10.1103/PhysRevC.69.032801

Authors & Affiliations

P. Mohr^1,2,*, T. Shizuma³, H. Ueda⁴, S. Goko⁴, A. Makinaga⁴, K. Y. Hara⁴, T. Hayakawa^3,5, Y.-W. Lui⁶, H. Ohgaki⁷, and H. Utsunomiya⁴

¹Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, D-64289 Darmstadt, Germany
²Strahlentherapie, Diakoniekrankenhaus Schwäbisch Hall, D-74523 Schwäbisch Hall, Germany
³Advanced Photon Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan
⁴Department of Physics, Konan University, 8-9-1 Okamoto, Higashinada, Kobe 658-8501, Japan
⁵National Astronomical Observatory, Osawa 2-21-1, Mitaka, Tokyo 181-8588, Japan
⁶Cyclotron Institute, Texas A & M University, College Station, Texas 77843, USA
⁷Institute of Advanced Energy, Kyoto University, Gokanosho, Uji, Kyoto 611-0011, Japan

^*Electronic address: WidmaierMohr@compuserve.de

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Vol. 69, Iss. 3 — March 2004

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Physical Review C

covering nuclear physics

$s$ -process branching at ${}^{185}W$ revised

P. Mohr, T. Shizuma, H. Ueda, S. Goko, A. Makinaga, K. Y. Hara, T. Hayakawa, Y.-W. Lui, H. Ohgaki, and H. Utsunomiya

Phys. Rev. C 69, 032801(R) – Published 29 March 2004

Abstract

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Physical Review C

covering nuclear physics

s-process branching at W185 revised

P. Mohr, T. Shizuma, H. Ueda, S. Goko, A. Makinaga, K. Y. Hara, T. Hayakawa, Y.-W. Lui, H. Ohgaki, and H. Utsunomiya

Phys. Rev. C 69, 032801(R) – Published 29 March 2004

Abstract

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$s$ -process branching at ${}^{185}W$ revised