arXiv 2001.042552020-01-22nucl-exphysics.data-an

$β$衰变中子寿命的直接测定

Direct determination of neutron lifetime in $β$-decay

Valerius V. Vasiliev

备注：: 7 pages, 7 figures

摘要：

中子寿命目前最精确的测定方法有两种，即所谓的“束流法”和中子阱贮存法。本研究的目的是通过消除传统的系统误差来获得更高精度的中子寿命。一个新的特点是只从一组带有误差的电子计数率中提取中子寿命。新接收到的中子寿命值是$$ τ_{NT}=883.31\pm0.02(stat.)\pm0.02(sys.) \quad \mbox{s.} $$。获得的中子寿命是两个寿命的加权平均值，针对不同的中子子集定义，提供中子$β$衰变中的不对称性的公知效应。简单的计算预测这些寿命的值，并显示其对应的中子衰变的已知的不对称参数。确定了两个新引入的中子寿命的算术平均（中心）值。由此产生的加权值$τ_{NT}$与第一种和第二种方法中的寿命在其双重误差的限制下很好地一致，但在精度上明显超过它们。此外，新的寿命，这是所谓的$L$ -中子寿命和$R$ -中子寿命的估计，完成。估算结果与中子衰变不对称性的已知参数相一致。\keywords{neutron \and decay \and channel \and lifetime \and electron \and trap} \PACS{06.30.-k \and 12.90+b \and 13.30Ce \and 14.20.Dh \and 28.20-V \and 29.40 Cs}

英文摘要：

The neutron lifetime is determined for now most accurately by two methods --the so-called "beam method" and the method of neutron storage in a trap. The goal of this research is to obtain the neutron lifetime with a higher precision by eliminating the traditional systematic errors. A new feature is extracting the neutron lifetime only from the set of electron counting rates with their errors. The newly received neutron lifetime value is $$ τ_{NT}=883.31\pm0.02(stat.)\pm0.02(sys.) \quad \mbox{s.} $$ The obtained neutron lifetime is the weighted average of two lifetimes, defined for different subsets of neutrons providing the well-known effect of the asymmetry in the neutron $β$-decay. Simple calculations predict the values of these lifetimes and show their correspondence to the known asymmetry parameters of neutron decay. The arithmetic mean (central) value for the two newly introduced neutron lifetimes was determined. The resulting weighted value $τ_{NT}$ is in a good agreement with the lifetimes in the first and second methods in limits of their double errors, but exceeds them significantly in precision. In addition, estimates of the new lifetimes, which are called here as $L$-neutron lifetime and $R$-neutron lifetime, are fulfilled. The estimation results correspond to the known parameters of the neutron decay asymmetry. \keywords{neutron \and decay \and channel \and lifetime \and electron \and trap} \PACS{06.30.-k \and 12.90+b \and 13.30Ce \and 14.20.Dh \and 28.20-V \and 29.40 Cs}

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

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