The s-process branching at W-185

K. Sonnabend; P. Mohr; K. Vogt; A. Zilges; A. Mengoni; T. Rauscher; H. Beer; F. Kappeler; R. Gallino

The s-process branching at W-185

K. Sonnabend, P. Mohr, K. Vogt, A. Zilges, A. Mengoni, T. Rauscher, H. Beer, F. Kappeler, R. Gallino

Centre for Astrophysics Research (CAR)

Research output: Contribution to journal › Article › peer-review

56 Citations (Scopus)

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
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

Cite this

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title = "The s-process branching at W-185",

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.",

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",

author = "K. Sonnabend and P. Mohr and K. Vogt and A. Zilges and A. Mengoni and T. Rauscher and H. Beer and F. Kappeler and R. Gallino",

year = "2003",

month = jan,

day = "20",

language = "English",

volume = "583",

pages = "506--513",

journal = "The Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

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TY - JOUR

T1 - The s-process branching at W-185

AU - Sonnabend, K.

AU - Mohr, P.

AU - Vogt, K.

AU - Zilges, A.

AU - Mengoni, A.

AU - Rauscher, T.

AU - Beer, H.

AU - Kappeler, F.

AU - Gallino, R.

PY - 2003/1/20

Y1 - 2003/1/20

N2 - 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.

AB - 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.

KW - GAMMA-PROCESS

KW - STATISTICAL-MODEL CALCULATIONS

KW - R-PROCESS

KW - PHOTONEUTRON CROSS-SECTIONS

KW - methods : laboratory

KW - NUCLEAR-LEVEL DENSITY

KW - ASTROPHYSICAL REACTION-RATES

KW - nuclear reactions, nucleosynthesis, abundances

KW - NUCLEOSYNTHESIS

KW - HALF-LIVES

KW - NEUTRON-CAPTURE

KW - ASYMPTOTIC GIANT BRANCH

M3 - Article

SN - 0004-637X

VL - 583

SP - 506

EP - 513

JO - The Astrophysical Journal

JF - The Astrophysical Journal

IS - 1

ER -

The s-process branching at W-185

Abstract

Keywords

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