Measurements of the Neutron Lifetime

被引：21

作者：

Wietfeldt, F. E. ^{[1
]}

机构：

[1] Tulane Univ, Dept Phys & Engn Phys, New Orleans, LA 70118 USA

来源：

ATOMS | 2018年 / 6卷 / 04期

基金：

美国国家科学基金会;

关键词：

neutron decay; neutron lifetime; beta decay;

D O I：

10.3390/atoms6040070

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

Free neutron decay is a fundamental process in particle and nuclear physics. It is the prototype for nuclear beta decay and other semileptonic weak particle decays. Neutron decay played a key role in the formation of light elements in the early universe. The precise value of the neutron mean lifetime, about 15 min, has been the subject of many experiments over the past 70 years. The two main experimental methods, the beam method and the ultracold neutron storage method, give average values of the neutron lifetime that currently differ by 8.7 s (4 standard deviations), a serious discrepancy. The physics of neutron decay, implications of the neutron lifetime, previous and recent experimental measurements, and prospects for the future are reviewed.

引用

页数：19

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