Thermal neutron reaction cross section measurements for fourteen nuclides with a liquid scintillation spectrometer

Takiue, Makoto; Ishikawa, Hiroaki

doi:10.1016/0029-554x(78)90347-6

Cited by 34 publications

(6 citation statements)

References 19 publications

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“…The diffuse scattering cross section aa= at +aie is written as the sum of the incoherent o-i and inelastic a~e which can be estimated [5] 9 ~ (105+2 [6]; 106___3 [7]), Tm aaYb" a~ (35.5+1.4 [8]; 37___5 [7]). …”

Section: Natural Elementsmentioning

confidence: 99%

Neutron scattering lengths of the isotopes of thulium, ytterbium and lutetium

Koester

Knopf

1986

Z. Physik A - Atomic Nuclei

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Section: Natural Elementsmentioning

confidence: 99%

Neutron scattering lengths of the isotopes of thulium, ytterbium and lutetium

Koester

Knopf

1986

Z. Physik A - Atomic Nuclei

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“…[7,13] we obtain an isomeric ratio, IR(30 keV)= σ m /σ tot = 0.15 ± 0.42, where σ m = σ tot − σ g . This value is too [4,12,17]. As shown in figure 4, the measurements of the total (n,γ) cross section, which were carried out via the time-of-flight technique, are responsible for the large uncertainty in IR.…”

Section: Measurement Of 209 Bi(nγ) 210 Bi G Cross Sectionmentioning

confidence: 99%

Measurement of the ²⁰⁹Bi(n,γ)²¹⁰Bi^g cross section and updated s-process analysis of the Pb/Bi region

Bisterzo

Käppeler²,

Gallino

et al. 2007

Nd2007

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Abstract. The neutron capture cross section of 209 Bi(n,γ) 210 Bi has been measured using the 3.7 MV Van de Graaff accelerator at Forschungszentrum Karlsruhe. The measurement was carried out by activation of a high purity Bi sample in a quasi-stellar neutron spectrum with kT = 25 keV by employing the 7 Li(p,n) 7 Be reaction at E p = 1912 keV. We performed four activations: two to count the α-activity of 210 Po and two more for Accelerator Mass Spectrometry (AMS) analysis at the VERA facility in Vienna. The aim of our study is to measure the partial cross sections to the ground and the isomeric state with improved accuracy, which is necessary to understand the recycling via α-decay of 210,211 Po and the corresponding accumulation of the s-process abundances at the end of the s-path. The Maxwellian averaged cross section for populating the ground state of 210 Bi at a thermal energy of kT = 30 keV was determined to be σv /v T = 2.16 ± 0.07 mb. For the isomeric state the measurements are in progress. Based on the present results and on the new data for the stable Pb isotopes measured at n TOF, we performed a theoretical analysis using stellar models of Asymptotic Giant Branch (AGB) stars. The effect of the new cross section values in the Pb/Bi region was studied by averaging the results of stellar models for M = 1.5 and 3 M and a half-solar metallicity for the main component, and at [Fe/H]= −1.3 for the strong component. At this lower metallicity the AGB stars have been shown to produce the maximum amount of s-process lead, thus providing a good approximation of the strong component. A study of these aspect is in preparation.

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“…A number of experimental data of 209 Bi(n,γ) 210g Bi capture cross section at different neutron energies were reported in previous studies, including thermal neutrons [2][3][4][5], neutrons in the resonance region [6][7][8][9], and neutrons with quasi-Maxwellian distribution at kT = 30 * kafa.khasawneh@gmail.com keV [10][11][12]. With an overview of this data and when compared to the evaluated values, one can see a considerable disagreement.…”

Section: Introductionmentioning

confidence: 99%

Determination of the $^{209}$Bi(n,$γ$)$^{210g}$Bi cross section using the NICE-Detector

Al-Khasawneh,

Borris,

Brückner

et al. 2021

Preprint

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The capture cross section of 209 Bi(n,γ) 210g Bi was measured at different astrophysically energies including thermal capture cross section (25 meV), resonance integral, and the Maxwellian averaged cross section at a thermal energy of kT = 30 keV. The partial capture cross section (σ g ) was determined using the activation technique and by measuring the 210 Po activity. The newly developed and tested NICE detector setup was used to measure the α-activity of the 210 Po. Using this setup the thermal and resonance integral cross sections were determined to be 16.2 ± 0.97 mb and 89.81 ± 8.0 mb, respectively. And the Maxwellian average cross section was measured to be 2.01 ± 0.38 mb.

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Thermal neutron reaction cross section measurements for fourteen nuclides with a liquid scintillation spectrometer

Cited by 34 publications

References 19 publications

Neutron scattering lengths of the isotopes of thulium, ytterbium and lutetium

Neutron scattering lengths of the isotopes of thulium, ytterbium and lutetium

Measurement of the ²⁰⁹Bi(n,γ)²¹⁰Bi^g cross section and updated s-process analysis of the Pb/Bi region

Determination of the $^{209}$Bi(n,$γ$)$^{210g}$Bi cross section using the NICE-Detector

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Thermal neutron reaction cross section measurements for fourteen nuclides with a liquid scintillation spectrometer

Cited by 34 publications

References 19 publications

Neutron scattering lengths of the isotopes of thulium, ytterbium and lutetium

Neutron scattering lengths of the isotopes of thulium, ytterbium and lutetium

Measurement of the 209Bi(n,γ)210Big cross section and updated s-process analysis of the Pb/Bi region

Determination of the $^{209}$Bi(n,$γ$)$^{210g}$Bi cross section using the NICE-Detector

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Measurement of the ²⁰⁹Bi(n,γ)²¹⁰Bi^g cross section and updated s-process analysis of the Pb/Bi region