Investigation of 54Fe(n,γ)55Fe and 35Cl(n, γ)36Cl reaction cross sections at keV energies by Accelerator Mass Spectrometry

Investigation of 54Fe(n,γ)55Fe and 35Cl(n, γ)36Cl reaction cross sections at keV energies by Accelerator Mass Spectrometry
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通过加速器质谱法研究 keV 能量下的 54Fe(n,γ)55Fe 和 35Cl(n,γ)36Cl 反应截面

DOI:
10.1051/epjconf/202023202005
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发表时间:
2020
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影响因子:
--
通讯作者:
Weigand
Weigand
中科院分区:
--
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--
作者:
Zuzana Slavkovská;Anton Wallner;René Reifarth;Stefan Pavetich;Lukas Bott;Benjamin Brückner;Kathrin Göbel;Kafa Al-Khasawneh;Dominik Koll;Silke Merchel;Markus Reich;Meiko Volknandt;Weigand

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在德国的卡尔斯鲁厄理工学院(KIT)经常进行keV能量范围内的中子活化,以模拟中子俘获截面的恒星条件。在卡尔斯鲁厄货车德格拉夫加速器上,利用1912 keV质子束进行~ 7 Li(p,n)反应,产生了kT = 25 keV的准Maxwell-Boltzmann中子能谱。用加速器质谱法(AMS)分析了产生半衰期为1亿年的长寿命核反应产物的活化样品。从以前的飞行时间(ToF)测量得到的反应截面的文献数据的比较表明,所选择的AMS数据系统低于ToF数据。为了研究这种差异,在德国的法兰克福中子源(FRANZ)上测量了~(54)Fe(n,γ)~(55)Fe和~(35)Cl(n,γ)~(36)Cl反应截面。为了补充现有的数据,额外的中子活化54 Fe和35 Cl在质子能量为2兆电子伏进行。结果将给恒星环境atkT= 90千电子伏的影响,达到尚未实验探索的高能量的S-过程范围。计划对活化样品进行AMS测量。
Activations with neutrons in the keV energy range were routinely performed at the Karlsruhe Institute of Technology (KIT) in Germany in order to simulate stellar conditions for neutron-capture cross sections. A quasi-Maxwell-Boltzmann neutron spectrum ofkT= 25 keV, being of interest for the astrophysical s-process, was produced by the7Li(p,n) reaction utilizing a 1912 keV proton beam at the Karlsruhe Van de Graaff accelerator. Activated samples resulting in long-lived nuclear reaction products with half-lives in the order of yr 100 Myr were analyzed by Accelerator Mass Spectrometry (AMS). Comparison of the obtained reaction cross sections to literature data from previous Time-of-Flight (ToF) measurements showed that the selected AMS data are systematically lower than the ToF data. To investigate this discrepancy,54Fe(n,γ)55Fe and35Cl(n,γ)36Cl reaction cross sections were newly measured at the Frankfurt Neutron Source (FRANZ) in Germany. To complement the existing data, an additional neutron activation of54Fe and35Cl at a proton energy of 2 MeV was performed. The results will give implications for the stellar environment atkT= 90 keV, reaching the not yet experimentally explored high-energy s-process range. AMS measurements of the activated samples are scheduled.
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