Reconciling Private Lives and Public Rhetoric:

Couture, Barbara

doi:10.2307/j.ctt46nws6.5

Cited by 3 publications

(3 citation statements)

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“…This experiment was designed partially to improve the quality of the 242 Pu(n,γ) cross section with respect to the previous, unpublished measurement [40] by doubling the beam time to improve the event statistics, and thinning Kapton foils by a factor of ≈ 6 for the PPAC entrance and exit windows to reduce beam-induced backgrounds.…”

Section: Methodsmentioning

confidence: 99%

Absolute measurement of thePu242neutron-capture cross section

Buckner

Henderson

et al. 2016

Phys. Rev. C

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The absolute neutron-capture cross section of 242 Pu was measured at the Los Alamos Neutron Science Center using the Detector for Advanced Neutron-Capture Experiments array along with a compact parallel-plate avalanche counter for fission-fragment detection. The first direct measurement of the 242 Pu(n,γ) cross section was made over the incident neutron energy range from thermal to ≈ 6 keV, and the absolute scale of the (n,γ) cross section was set according to the known 239 Pu(n,f) resonance at En,R = 7.83 eV. This was accomplished by adding a small quantity of 239 Pu to the 242 Pu sample. The relative scale of the cross section, with a range of four orders of magnitude, was determined for incident neutron energies from thermal to ≈ 40 keV. Our data, in general, are in agreement with previous measurements and those reported in ENDF/B-VII.1; the 242 Pu(n,γ) cross section at the En,R = 2.68 eV resonance is within 2.4% of the evaluated value. However, discrepancies exist at higher energies; our data are ≈30% lower than the evaluated data at En ≈ 1 keV and are approximately 2σ away from the previous measurement at En ≈ 20 keV.

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Section: Methodsmentioning

confidence: 99%

Absolute measurement of thePu242neutron-capture cross section

Buckner

Henderson

et al. 2016

Phys. Rev. C

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“…The targets used in the present experiment were tested using well known resonances in the 19 F(p,αγ) 16 O reaction. The results indicated that the stoichiometry of the evaporated material is the same as that of the CaF 2 powder [26]. Both peaks appear clean of background and are easy to identify.…”

Section: Experimental Methodsmentioning

confidence: 81%

The thermonuclear rate for the 19F(a,p)22Ne reaction at stellar temperatures

Ugalde,

Azuma,

Couture

et al. 2008

Preprint

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The 19 F(α,p) 22 Ne reaction is considered to be one of the main sources of fluorine depletion in AGB and Wolf-Rayet stars. The reaction rate still retains large uncertainties due to the lack of experimental studies available. In this work the yields for both exit channels to the ground state and first excited state of 22 Ne have been measured and several previously unobserved resonances have been found in the energy range E lab =792-1993 keV. The level parameters have been determined through a detailed R-matrix analysis of the reaction data and a new reaction rate is provided on the basis of the available experimental information.

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“…The array surrounds the target covering almost 2π of the solid angle. This APOLLO array was built by a group from Los Alamos National Laboratory 78 to study the gamma-emission cascades of high-lying states with the goal to use (d, p) reactions as a surrogate for (n, γ ) processes on unstable nuclei. It is expected that this detector system will also find applications in other nuclear astrophysics astrophysical studies.…”

Section: The Helios Spectrometermentioning

confidence: 99%

Astrophysics experiments with radioactive beams at ATLAS

Back¹,

Clark²,

Pardo³

et al. 2014

AIP Advances

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Reactions involving short-lived nuclei play an important role in nuclear astrophysics, especially in explosive scenarios which occur in novae, supernovae or X-ray bursts. This article describes the nuclear astrophysics program with radioactive ion beams at the ATLAS accelerator at Argonne National Laboratory. The CARIBU facility as well as recent improvements for the in-flight technique are discussed. New detectors which are important for studies of the rapid proton or the rapid neutron-capture processes are described. At the end we briefly mention plans for future upgrades to enhance the intensity, purity and the range of in-flight and CARIBU beams.

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Reconciling Private Lives and Public Rhetoric:

Cited by 3 publications

References 0 publications

Absolute measurement of thePu242neutron-capture cross section

Absolute measurement of thePu242neutron-capture cross section

The thermonuclear rate for the 19F(a,p)22Ne reaction at stellar temperatures

Astrophysics experiments with radioactive beams at ATLAS

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