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Resonance Capture Cross Section of 207Pb

The radiative neutron capture cross section of 207Pb has been measured at the CERN neutron time of flight installation n TOF using the pulse height weighting technique in the resolved energy region. The measurement has been performed with an...

Översikt

Beteckning
DOI: 10.1103/PhysRevC.74.055802, URL: http://journals.aps.org/prc/abstract/10.1103/PhysRevC.74.055802, URL: http://publications.jrc.ec.europa.eu/repository/handle/JRC35573, JRC nr: JRC35573
Publiceringsdatum
20 maj 2015

Beskrivning

The radiative neutron capture cross section of 207Pb has been measured at the CERN neutron time of flight installation n TOF using the pulse height weighting technique in the resolved energy region. The measurement has been performed with an optimized setup of two C6D6 scintillation detectors, which allowed us to reduce scattered neutron backgrounds down to a negligible level.
Resonance parameters and radiative kernels have been determined for 16 resonances by means of an R-matrix analysis in the neutron energy range from 3 keV to 320 keV. Good agreement with previous measurements was found at low neutron energies, whereas substantial discrepancies appear beyond 45 keV. With the present results, we obtain an s-process contribution of 77?8% to the solar abundance of 207Pb. This corresponds to an r-process component of 23?8%, which is important for
deriving the U/Th ages of metal poor halo stars.

Authors:

DOMINGO PARDO Cesar, ABBONDANNO U., N TOF COLLABORATION -

Publisher:

AMERICAN PHYSICAL SOC

Format medium:

Printed