When embedded in an atomic nucleus, neutrons are (usually) stable particles. Outside the nucleus, free neutrons are unstable and have a mean lifetime of 879.6±0.8 s (about 14 min, 39.6 s). Therefore, the half-life for this process (which differs from the mean lifetime by a factor of ln(2) ≈ 0.693) is 611±1 s (about 10 min, 11 s). (An article published in October 2021, arrives at 877.75+0.50−0.44 s for the mean lifetime). The beta decay of the neutron described in this article can be notated at four slightly different levels of detail, as shown in four layers of Feynman diagrams in a .
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| - Free neutron decay (en)
- Désintégration du neutron libre (fr)
- Бета-распад нейтрона (ru)
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| - À l’interface entre la physique nucléaire et la physique des particules, la désintégration du neutron libre est un processus faisant intervenir l’interaction faible, au cours duquel un neutron libre (non lié à d’autres nucléons) se désintègre spontanément en un proton, un électron et un antineutrino électronique. La mesure précise de cette désintégration est fondamentale pour les théories décrivant la nucléosynthèse primordiale, qui s’est déroulée juste après le Big Bang. Selon les mesures, la durée de vie moyenne du neutron libre est d’environ 880 secondes (un peu moins de 15 minutes). (fr)
- When embedded in an atomic nucleus, neutrons are (usually) stable particles. Outside the nucleus, free neutrons are unstable and have a mean lifetime of 879.6±0.8 s (about 14 min, 39.6 s). Therefore, the half-life for this process (which differs from the mean lifetime by a factor of ln(2) ≈ 0.693) is 611±1 s (about 10 min, 11 s). (An article published in October 2021, arrives at 877.75+0.50−0.44 s for the mean lifetime). The beta decay of the neutron described in this article can be notated at four slightly different levels of detail, as shown in four layers of Feynman diagrams in a . (en)
- Бе́та-распа́д нейтро́на — спонтанное превращение свободного нейтрона в протон с излучением β-частицы (электрона) и электронного антинейтрино: Спектр кинетической энергии излучаемого электрона лежит в диапазоне от 0 до 782,318 кэВ. Время жизни свободного нейтрона составляет 880,1 ± 1,1 секунды (что соответствует периоду полураспада 611 ± 0,8 с). Прецизионные измерения параметров бета-распада нейтрона (время жизни, между импульсами частиц и спином нейтрона) имеют важное значение для определения свойств слабого взаимодействия. (ru)
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| - When embedded in an atomic nucleus, neutrons are (usually) stable particles. Outside the nucleus, free neutrons are unstable and have a mean lifetime of 879.6±0.8 s (about 14 min, 39.6 s). Therefore, the half-life for this process (which differs from the mean lifetime by a factor of ln(2) ≈ 0.693) is 611±1 s (about 10 min, 11 s). (An article published in October 2021, arrives at 877.75+0.50−0.44 s for the mean lifetime). The beta decay of the neutron described in this article can be notated at four slightly different levels of detail, as shown in four layers of Feynman diagrams in a . n0 → p+ + e− + νe The hard-to-observe W− quickly decays into an electron and its matching antineutrino. The subatomic reaction shown immediately above depicts the process as it was first understood, in the first half of the 20th century. The boson ( W− ) vanished so quickly that it was not detected until much later.Later, beta decay was understood to occur by the emission of a weak boson ( W± ), sometimes called a charged weak current. Beta decay specifically involves the emission of a W− boson from one of the down quarks hidden within the neutron, thereby converting the down quark into an up quark and consequently the neutron into a proton. The following diagram gives a summary sketch of the beta decay process according to the present level of understanding. The down quark shown in bold (d) is nominally the one emitting the boson ( W− ) and thereby changing into an up quark (u), also in bold. The ud quark pair not shown in bold are inert bystanders to the whole event. For diagrams at several levels of detail, see , below. (en)
- À l’interface entre la physique nucléaire et la physique des particules, la désintégration du neutron libre est un processus faisant intervenir l’interaction faible, au cours duquel un neutron libre (non lié à d’autres nucléons) se désintègre spontanément en un proton, un électron et un antineutrino électronique. La mesure précise de cette désintégration est fondamentale pour les théories décrivant la nucléosynthèse primordiale, qui s’est déroulée juste après le Big Bang. Selon les mesures, la durée de vie moyenne du neutron libre est d’environ 880 secondes (un peu moins de 15 minutes). (fr)
- Бе́та-распа́д нейтро́на — спонтанное превращение свободного нейтрона в протон с излучением β-частицы (электрона) и электронного антинейтрино: Спектр кинетической энергии излучаемого электрона лежит в диапазоне от 0 до 782,318 кэВ. Время жизни свободного нейтрона составляет 880,1 ± 1,1 секунды (что соответствует периоду полураспада 611 ± 0,8 с). Прецизионные измерения параметров бета-распада нейтрона (время жизни, между импульсами частиц и спином нейтрона) имеют важное значение для определения свойств слабого взаимодействия. Бета-распад нейтрона был предсказан Фредериком Жолио-Кюри в 1934 и открыт в 1948—1950 независимо А. Снеллом, Дж. Робсоном и П. Е. Спиваком. (ru)
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