title: ÐÑÐµÑÐ¸Ð·Ð¸Ð¾Ð½Ð½Ð¾Ðµ Ð¸Ð·Ð¼ÐµÑÐµÐ½Ð¸Ðµ Ð²ÑÐµÐ¼ÐµÐ½Ð¸ Ð¶Ð¸Ð·Ð½Ð¸ Ð½ÐµÐ¹ÑÑÐ¾Ð½Ð° Ð¸ ÑÐ²ÑÐ·Ñ Ñ Ð¿ÑÐ¾ÑÐµÑÑÐ°Ð¼Ð¸ Ð¿ÐµÑÐ²Ð¸ÑÐ½Ð¾Ð³Ð¾ Ð½ÑÐºÐ»ÐµÐ¾ÑÐ¸Ð½ÑÐµÐ·Ð°
title: Ð½Ð°ÑÑÐ½ÑÐ¹ Ð´Ð¾ÐºÐ»Ð°Ð´
titleType: Subtitle
title: Precision measurement of the neutron lifetime and connection with the processes of primordial nucleosynthesis
Creators: name: Ð§ÐµÑÐºÐ¸Ð½, ÐÐ½ÑÐ¾Ð½
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2018
Subjects: ÐÑÑÑÐ¾ÑÐ¸Ð·Ð¸ÐºÐ°
ÐÐµÐ¹ÑÑÐ¾Ð½Ñ
ÐÐµÑÐ°-ÑÐ°ÑÐ¿Ð°Ð´
Ð°ÑÑÑÐ¾ÑÐ¸Ð·Ð¸ÐºÐ°
ÑÐ¸Ð·Ð¸ÐºÐ° ÑÐ°ÑÑÐ¸Ñ
Ð²ÑÐµÐ¼Ñ Ð¶Ð¸Ð·Ð½Ð¸
Ð¿ÐµÑÐ²Ð¸ÑÐ½ÑÐ¹ Ð½ÑÐºÐ»ÐµÐ¾ÑÐ¸Ð½ÑÐµÐ·

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description: A new measurement of the neutron lifetime, performed with the aid of a large gravitational spectrometer at the St. Petersburg Institute of Nuclear Physics (PNPI) is presented. Comparison of the new result with previous experiments shows that it is in agreement with the methods using the storage of ultracold neutrons, while the results of beam neutron measurements significantly diverge from them. The calculation of the optimal parameters necessary for the measurement and calculation of systematic errors is presented. It is pointed out that with increasing accuracy of astrophysical measurements, the neutron lifetime will become an progressively sensitive parameter in the models of primary nucleosynthesis. Today's results of measuring the primary concentration of helium-4 also give two nonoverlapping results. Therefore, research on both areas, which are in consideration of this work, is necessary to continue.