Weak interactions of the neutron

Byrne, J.

doi:10.1088/0034-4885/45/2/001

Cited by 35 publications

(11 citation statements)

References 342 publications

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“…3 of Ref. [37]). The backward electron spectrum is defined as where Our usual factorization gives Finally, we mention that we have calculated the radiative corrections presented in Tables I1 and IV-VII by several different methods (one of them is described in the Appendix).…”

Section: F R N ( E 2 ) = + L If E 2 < E Z H ;mentioning

confidence: 88%

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Measurable distributions of unpolarized neutron decay

Glück

1993

Phys. Rev. D

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Several two-and one-dimensional distributions of unpolarized free-neutron decay are calculated. The results of the order-a model-independent radiative correction calculations are tabulated numerically. With these corrections the theoretical distributions become precise enough to make possible the determination of the ratio of the axial-vector to the vector weak coupling constants to a precision of -0.001.

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Section: F R N ( E 2 ) = + L If E 2 < E Z H ;mentioning

confidence: 88%

“…[37] for earlier references). We mention that the determination of h with (this is valid for the bremsstrahlung events, too).…”

Section: Distributionmentioning

confidence: 99%

Measurable distributions of unpolarized neutron decay

Glück

1993

Phys. Rev. D

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“…For many years there were large discrepancies between different measurements of τ n suggestive of unknown systematic errors (see Byrne 1982). Until recently most BBN calculations adopted a relatively high value, viz.…”

Section: Uncertaintiesmentioning

confidence: 99%

Big bang nucleosynthesis and physics beyond the standard model

1996

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Abstract. The Hubble expansion of galaxies, the 2.73 K blackbody radiation background and the cosmic abundances of the light elements argue for a hot, dense origin of the universe -the standard Big Bang cosmology -and enable its evolution to be traced back fairly reliably to the nucleosynthesis era when the temperature was of O(1) MeV corresponding to an expansion age of O(1) sec. All particles, known and hypothetical, would have been created at higher temperatures in the early universe and analyses of their possible effects on the abundances of the synthesized elements enable many interesting constraints to be obtained on particle properties. These arguments have usefully complemented laboratory experiments in guiding attempts to extend physics beyond the Standard SU (3) c ⊗SU (2) L ⊗U (1) Y Model, incorporating ideas such as supersymmetry, compositeness and unification. We first present a pedagogical account of relativistic cosmology and primordial nucleosynthesis, discussing both theoretical and observational aspects, and then proceed to examine such constraints in detail, in particular those pertaining to new massless particles and massive unstable particles. Finally, in a section aimed at particle physicists, we illustrate applications of such constraints to models of new physics.

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“…Время жизни нейтрона напрямую используется в расчетах распространенности легких ядер при первичном ядерном синтезе в космологических моделях [1,2]. В комбинации с измерениями корреляционных коэффициентов в бета-распаде нейтрона время жизни нейтрона используется для определения векторной G V и аксиально-векторной G A констант слабого взаимодействия [3][4][5]. Эти константы, в свою очередь, необходимы для расчетов потоков солнечных и реакторных нейтрино [6,7], а также для проверки унитарности матрицы Кабиббо−Кобайяши−Маскавы в Стандартной Модели и поиска Новой Физики вне Стандартной Модели [8].…”

Section: Introductionunclassified

Установка Для Измерения Времени Жизни Нейтрона С Большой Гравитационной Ловушкой При Низкой Температуре

Серебров¹,

Коломенский²,

Фомин³

et al. 2019

Журнал Технической Физики

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Currently the most accurate measurements of neutron lifetime are being performed at the Petersburg Nuclear Physics Institute with ultracold neutrons (UCNs) stored in a gravitational trap. A modified setup with a large gravitational trap and cooling to 10–15 K is presented. The results of measurements of temperature dependence of UCN losses in collisions with walls, which were coated with a perfluorinated grease (Fomblin UT 18), at 300–77 K, are detailed. The probable heat inflow to the trap is estimated, and the feasibility of cooling to indicated temperatures in experiments with the modified setup is demonstrated.

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Weak interactions of the neutron

Abstract: These are only hints and guesses, Hints followed by guesses; and the rest Is prayer, observance, discipline, thought and action.

Cited by 35 publications

References 342 publications

Measurable distributions of unpolarized neutron decay

Measurable distributions of unpolarized neutron decay

Big bang nucleosynthesis and physics beyond the standard model

Установка Для Измерения Времени Жизни Нейтрона С Большой Гравитационной Ловушкой При Низкой Температуре

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