Neutron Capture Data at Stellar Temperatures

Macklin, R. L.; Gibbons, John H.

doi:10.1103/revmodphys.37.166

Cited by 86 publications

(52 citation statements)

References 28 publications

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“…The capture cross sections of medium-mass and heavy nuclei required for the interpretation of various mechanisms of stellar nucleosynthesis have been extensively measured in the course of the last few decades [8,9]. However, fast neutron capture cross sections have been rarely measured for light nuclear targets.…”

Section: Introductionmentioning

confidence: 99%

Nonresonant directp- andd-wave neutron capture by12C

et al. 1998

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Discrete γ-rays from the neutron capture state of 13 C to its low-lying bound states have been measured using pulsed neutrons at E n = 550 keV. The partial capture cross sections have been determined to be 1.7±0.5, 24.2±1.0, 2.0±0.4 and 1.0±0.4 µb for the ground (J π = 1/2 − ), first (J π = 1/2 + ), second (J π = 3/2 − ) and third (J π = 5/2 + ) excited states, respectively. From a comparison with theoretical predictions based on the non-resonant direct radiative capture mechanism, we could determine the spectroscopic factor for the J π = 1/2 + state to be 0.80 ± 0.04, free from neutron-nucleus interaction ambiguities in the continuum. In addition we have detected the contribution of the non-resonant d-wave capture component in the partial cross sections 1 for transitions leading to the J π = 1/2 − and J π = 3/2 − states. While the s-wave capture dominates at E n ≤ 100 keV, the d-wave component turns out to be very important at higher energies. From the present investigation the 12 C(n, γ) 13 C reaction rate is obtained for temperatures in the range 10 7 −

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Section: Introductionmentioning

confidence: 99%

Nonresonant directp- andd-wave neutron capture by12C

et al. 1998

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“…Mac.klin and Gibbons [12] 1 The 1.5% unc.ertainty of the gold c.ross sec.tion is not inc.luded, sinc.e it c.anc.els out in most applic.ations of relevanc.e for nuc.lear astrophysic.s. 2 Renormalized to gold c.ross sec.tion used in the present work [29].…”

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confidence: 99%

Stellar neutron capture cross sections of the tin isotopes

Wisshak¹,

Voß²,

Theis³

et al. 1996

Phys. Rev. C

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The neutron capture cross sections of 114 Sn, 115 Sn, 116 Sn, 117 Sn, 118 Sn, ancl 120 Sn were measurecl in the energy range from :3 to 225 keV at the Karlsruhe :3.75 MV V an de Graaff accelerator. Neutrons were produced via the 7 Li(p,n)1Be reaction by bombarcling metallic Li targets with a pulsed proton beam. Capture events were registered with the Karlsruhe 47r Barium Fluoride Detector, which was improved by replacing crystals with high a background. This allowed to lower the threshold in sum energy and resulted in a significantly increased efficiency for capture events. The experiment was difficult due to the small ( n,')') cross sec.tions of the proton magic tin isotopes, and due to the comparably low enrichment of the rare isotopes 114 Sn and 115 Sn. This caused significant corrections for capture of scattered neutrons and for isotopic impurities, but the high efficiency and the spectroscopic quali ty of the BaF 2 detector allowed to determine these corrections relia.bly. Typica.l overall uncertainties of 1-2% could be a.chieved for the cross section ratios, five times smaller compared to existing data. Basecl on these results, Maxwellia.n a.veraged (n,1) cross sections were ca.lculated for thermal energies between kT = 10 keV and 100 keV. ZUSAMMENFASSUNG

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“…The Maxwellian-averaged (n,γ) cross sections (MACS) in a stellar plasma of thermal energy kT is defined as in Ref. [48] by formula 4.…”

Section: Maxwellian-averaged (Nγ) Cross Sectionsmentioning

confidence: 99%

Radiative neutron capture cross sections onLu176at DANCE

et al. 2016

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The cross section of the neutron capture reaction 176 Lu(n,γ) has been measured for a wide incident neutron energy range with the Detector for Advanced Neutron Capture Experiments at the Los Alamos Neutron Science Center. The thermal neutron capture cross section was determined to be (1967±137) b for one of the Lu natural isotopes, 176 Lu. The resonance part was measured and compared to the Mughabghab's atlas using the R-matrix code, SAMMY. At higher neutron energies the measured cross sections are compared to ENDF/B-VII.1, JEFF-3.2 and BRC evaluated nuclear data. The Maxwellian averaged cross sections in a stellar plasma for thermal energies between 5 keV and 100 keV were extracted using these data.

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Neutron Capture Data at Stellar Temperatures

Cited by 86 publications

References 28 publications

Nonresonant directp- andd-wave neutron capture by12C

Nonresonant directp- andd-wave neutron capture by12C

Stellar neutron capture cross sections of the tin isotopes

Radiative neutron capture cross sections onLu176at DANCE

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