Resonance neutron capture by<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Bi</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>209</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>

Macklin, R. L.; Halperin, J.

doi:10.1103/physrevc.14.1389

Cited by 34 publications

(29 citation statements)

References 8 publications

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“…The normalization to a reference cross section was performed by means of the saturated resonance technique [25] using the prominent 4.9-eV resonance in 197 Au.…”

Section: Determination Of Capture Yieldsmentioning

confidence: 99%

TheZr92(n,γ) reaction and its implications for stellar nucleosynthesis

Tagliente¹,

Milazzo²,

Fujii³

et al. 2010

Phys. Rev. C

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Because the relatively small neutron capture cross sections of the zirconium isotopes are difficult to measure, the results of previous measurements are often not adequate for a number of problems in astrophysics and nuclear 0556-2813/2010/81(5)/055801 (9) 055801-1 ©2010 The American Physical Society G. TAGLIENTE et al.PHYSICAL REVIEW C 81, 055801 (2010) technology. Therefore, the 92 Zr(n,γ ) cross section has been remeasured at the CERN n TOF facility, providing a set of improved parameters for 44 resonances in the neutron energy range up to 40 keV. With this information the cross-section uncertainties in the keV region could be reduced to 5% as required for s-process nucleosynthesis studies and technological applications.

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“…The normalization to a reference cross section was performed by means of the saturated resonance technique [25] using the prominent 4.9-eV resonance in 197 Au.…”

Section: Determination Of Capture Yieldsmentioning

confidence: 99%

TheZr92(n,γ) reaction and its implications for stellar nucleosynthesis

Tagliente¹,

Milazzo²,

Fujii³

et al. 2010

Phys. Rev. C

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“…Sample scattered neutrons are easily captured in the materials surrounding the detector or in the sensitive detector volume itself, producing γ -rays, which appear as a prompt, TOF-dependent background. This effect becomes particularly crucial for the broad s-wave resonances in bismuth at low-neutron energies between 0.8 and 12 keV, resulting in corrections as large as 50% in previous measurements [6].…”

Section: Cross-section Measurementmentioning

confidence: 95%

“…The number of neutrons arriving at the sample are monitored by means of a 200-µg/cm 2 -thick 6 Li foil centered in the beam. The particles emitted in the 6 Li(n, α) 3 H reaction are registered with four silicon detectors surrounding the 6 Li foil outside of the beam.…”

Section: A the N Tof Installationmentioning

confidence: 99%

“…The particles emitted in the 6 Li(n, α) 3 H reaction are registered with four silicon detectors surrounding the 6 Li foil outside of the beam. The neutron monitor [14] is mounted in an evacuated carbon fiber chamber 3 m upstream of the samples.…”

Section: A the N Tof Installationmentioning

confidence: 99%

“…Previous experiments exhibit significant discrepancies suggesting the existence of systematic uncertainties, which must be clearly reduced for a more quantitative assessment of the Pb/Bi abundances. Two capture resonance studies on * Electronic address: Cesar.Domingo.Pardo@cern.ch 209 Bi have been reported so far, one at ORNL [6] and the other at GELINA [7,8]. In the former measurement, two strong s-wave resonances at low neutron energy could not be measured because of a low-neutron-energy cutoff at 2.6 keV.…”

Section: Introductionmentioning

confidence: 99%

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New measurement of neutron capture resonances inBi209

Domingo‐Pardo¹,

Abbondanno²,

Aerts³

et al. 2006

Phys. Rev. C

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The neutron capture cross section of 209 Bi has been measured at the CERN n TOF facility by employing the pulse-height-weighting technique. Improvements over previous measurements are mainly because of an optimized detection system, which led to a practically negligible neutron sensitivity. Additional experimental sources of systematic error, such as the electronic threshold in the detectors, summing of γ -rays, internal electron conversion, and the isomeric state in bismuth, have been taken into account. γ -Ray absorption effects inside the sample have been corrected by employing a nonpolynomial weighting function. Because 209 Bi is the last stable isotope in the reaction path of the stellar s-process, the Maxwellian averaged capture cross section is important for the recycling of the reaction flow by α decays. In the relevant stellar range of thermal energies between kT = 5 and 8 keV our new capture rate is about 16% higher than the presently accepted value used for nucleosynthesis calculations. At this low temperature an important part of the heavy Pb-Bi isotopes are supposed to be synthesized by the s-process in the He shells of low mass, thermally pulsing asymptotic giant branch stars. With the improved set of cross sections we obtain an s-process fraction of 19±3% of the solar bismuth abundance, resulting in an r-process residual of 81±3%. The present (n, γ ) cross-section measurement is also of relevance for the design of accelerator driven systems based on a liquid metal Pb/Bi spallation target.

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Bi isotopes

Sukhoruchkin¹,

Soroko²,

Deriglazov³

Landolt-Börnstein - Group I Elementary Particles, Nuclei and Atoms

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Resonance neutron capture byBi209

Cited by 34 publications

References 8 publications

TheZr92(n,γ) reaction and its implications for stellar nucleosynthesis

TheZr92(n,γ) reaction and its implications for stellar nucleosynthesis

New measurement of neutron capture resonances inBi209

Bi isotopes

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