Superfluid-helium converter for accumulation and extraction of ultracold neutrons.
Superfluid-helium converter for accumulation and extraction of ultracold neutrons.
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用于积累和提取超冷中子的超流氦转换器。
DOI：
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发表时间：
2007
影响因子：
8.6
通讯作者：
B. V. D. Brandt
中科院分区：
文献类型：
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作者：
O. Zimmer;K. Baumann;M. Fertl;B. Franke;S. Mironov;C. Plonka;D. Rich;P. Schmidt;H. Wirth;B. V. D. Brandt
我们报道了第一次成功地从超流氦转换器中提取积累的超冷中子(UCN)，在该转换器中，积累的超冷中子是由慕尼黑研究反应堆冷束的下散射中子产生的。无窗UCN提取通过机械冷阀在垂直方向上进行。这一多功能UCN源的原型由一个新的低温恒温器组成，旨在使源保持便携并允许快速冷却。我们在室温下测量了UCN储存和提取到探测器中的时间常数，转换器在0.7~1.3K的不同温度下保持不同的温度，从提取的UCN的计数速率推算出的UCN产率接近理论预期。
We report the first successful extraction of accumulated ultracold neutrons (UCN) from a converter of superfluid helium, in which they were produced by downscattering neutrons of a cold beam from the Munich research reactor. Windowless UCN extraction is performed in vertical direction through a mechanical cold valve. This prototype of a versatile UCN source is comprised of a novel cryostat designed to keep the source portable and to allow for rapid cooldown. We measured time constants for UCN storage and extraction into a detector at room temperature, with the converter held at various temperatures between 0.7 and 1.3 K. The UCN production rate inferred from the count rate of extracted UCN is close to the theoretical expectation.