DANCE Device for Measurement of (n,<i>γ</i>) Reactions on Radioactive Species

Wilhelmy, J. B.; Chamberlin, E. P.; Dragowsky, M. R.; Fowler, M. M.; Haight, R. C.; Heil, M.; Käppeler, F.; Miller, Guthrie; Palmer, Phillip D.; Pangault, L N; Reifarth, R.; Rundberg, R. S.; Seabrrry, E.H.; Strottman, D.; Ullmann, J. L.; Wisshak, K.

doi:10.1080/00223131.2002.10875175

Cited by 5 publications

(5 citation statements)

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“…In addition, the contribution from neutron captures on contaminants like 169 Tm is not discussed at all in [6]. Other experiments provide also hints at a much lower thermal capture cross section of only a few barn, which would be more in agreement with our result [5,20]. Unfortunately those results are very scarcely documented and not refereed.…”

Section: Summary and Discussionsupporting

confidence: 77%

Thermal (n,γ) cross section and resonance integral ofTm171

et al. 2019

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Background: About 50% of the heavy elements are produced in stars during the slow neutron capture process. The analysis of branching points allows us to set constraints on the temperature and the neutron density in the interior of stars. Purpose: The temperature dependence of the branch point 171 Tm is weak. Hence, the 171 Tm neutron capture cross section can be used to constrain the neutron density during the main component of the s process in thermally pulsing asymptotic giant branch (TP-AGB) stars. Methods: A 171 Tm sample produced at the ILL was activated with thermal and epithermal neutrons at the TRIGA research reactor at the Johannes Gutenberg-Universität Mainz. Results: The thermal neutron capture cross section and the resonance integral have been measured for the first time to be σ th = 9.9 ± 0.9 b and σ RI = 193 ± 14 b. Conclusions: Based on our results, new estimations of the direct capture components' impact on the Maxwellian-nAveraged cross sections (MACS) are possible.

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Section: Summary and Discussionsupporting

confidence: 77%

Thermal (n,γ) cross section and resonance integral ofTm171

et al. 2019

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“…The capture cross sections of 169 Tm have been measured in five laboratories before in the tens and hundreds keV energy range [3][4][5][6][7][8]. Among them, the activation method was used by Jiang Songsheng, while the others were performed using the prompt γ-rays method.…”

Section: A the Capture Cross Section Derived From The Capture Yieldmentioning

confidence: 99%

“…In addition, the radioactivity induced by the reactions of 169 Tm Tm and 170 Tm Tm makes the 169 Tm an ideal spectrumsensitive activation detector for the neutron intensity diagnosis, in which the precise neutron capture cross section is of critical importance. However, there are still nonnegligible discrepancies between the values recommended by different evaluated nuclear data libraries for the neutron capture cross section of 169 Tm, although they have been carefully measured and evaluated before [3][4][5][6][7][8]. In the energy region above 100 keV, the capture cross sections of 169 Tm measured by the activation method [6] are systematically lower than those measured with the prompt γ-ray method [5], and there is as much as 20% difference between the evaluated values in ENDF/B-VIII.0 [9] and those in JEFF-3.3 [10].…”

mentioning

confidence: 99%

Neutron capture cross section of ¹⁶⁹Tm measured at the CSNS Back-n facility in the energy region from 30 to 300 keV *

Ren¹,

Ruan²,

Jiang³

et al. 2022

Chinese Phys. C

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The capture cross sections of the 169Tm(n, γ) reaction were measured at the back streaming white neutron beam line (Back-n) of the China Spallation Neutron Source (CSNS) using four C6D6 liquid scintillation detectors. To obtain accurate cross sections, the background subtraction, normalization, and correction were carefully taken into consideration in the data analysis. For the resonance at 3.9 eV, the R-matrix code SAMMY was used to determine the resonance parameters with internally normalization method. While the average capture cross sections of 169Tm in the energy range between 30 keV and 300 keV were extracted relative to the 197Au(n, γ) reaction. The measured cross sections of the 169Tm(n, γ) reaction were reported in logarithmically equidistant energy bins with 20 bins per energy decade with a total uncertainty of 5.4%-7.0% in this paper, and described in terms of average resonance parameters by means of a Hauser-Feshbach calculation with fluctuations. Both of the point-wise cross sections and the averge resonance parameters showed fair agreement with the evaluated values of ENDF/B-VIII.0 library in the energy region studied.

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“…These requirements are best met by the 4π BaF 2 arrays at FZK (14) and LANL (5) with 42 and 162 detector modules, respectively. BaF 2 turned out to be the most suited scintillator material because of the unique combination of fast timing, high efficiency, low neutron sensitivity, and good resolution in γray energy.…”

Section: γ-Detectormentioning

confidence: 99%

“…At present, the most sensitive setup for (n,γ) measurements in the keV region is the DANCE project at LANSCE/LANL (5), which is designed for samples of about 1 mg in mass. Therefore, the proposed setup will only be compared with this facility.…”

Section: Comparison With Existing Facilitiesmentioning

confidence: 99%

Neutron capture measurements at a RIA-type facility

Reifarth

Haight

Heil³

et al. 2004

Nuclear Instruments and Methods in Physics Research Section A:

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Neutron capture cross sections of unstable isotopes are important for neutron induced nucleosynthesis as well as for technological applications. The Rare Isotope Accelerator (RIA) or comparable facilities will be able to produce radioactive ion beams up to 10 12 particles/s and would therefore be a suitable place for (n,γ) studies on radioactive isotopes with half-lives between days and months. We propose a facility for measurements of (n,γ) cross sections of unstable isotopes in the keV range suited for minimal sample masses down to 10 15 atoms, corresponding to minimum half-lives of only 10 d.

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DANCE Device for Measurement of (n,γ) Reactions on Radioactive Species

Cited by 5 publications

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Thermal (n,γ) cross section and resonance integral ofTm171

Thermal (n,γ) cross section and resonance integral ofTm171

Neutron capture cross section of ¹⁶⁹Tm measured at the CSNS Back-n facility in the energy region from 30 to 300 keV *

Neutron capture measurements at a RIA-type facility

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DANCE Device for Measurement of (n,γ) Reactions on Radioactive Species

Cited by 5 publications

References 0 publications

Thermal (n,γ) cross section and resonance integral ofTm171

Thermal (n,γ) cross section and resonance integral ofTm171

Neutron capture cross section of 169Tm measured at the CSNS Back-n facility in the energy region from 30 to 300 keV *

Neutron capture measurements at a RIA-type facility

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Product

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Neutron capture cross section of ¹⁶⁹Tm measured at the CSNS Back-n facility in the energy region from 30 to 300 keV *