Neutrinos from CNO cycle at the present epoch of the solar neutrino research
A.Kopylov, V.Petukhov, Institute for Nuclear Research of RAS
The importance of the study of solar neutrinos generated in CNO cycle is discussed in view of the presently obtained data. The emphasis is given to the precise detemination of the flux of low energy pp-neutrinos as a main topic of future experimental program.
Progress in Particle and Nuclear Physics 64 (2010) pp. 423-425

Низкофоновый ТГЭУ для счета ультранизкой активности альфа-, бета- и рентгеновского излучения
А.В.Копылов, И.В.Орехов, В.В.Петухов, А.А.Тихонов, ИЯИ РАН
Изготовлен опытный образец толстослойного газового электронного умножи- теля (ТГЭУ) с использованием фольгированного фторопласта в качестве низко- фонового материала и измерены его рабочие характеристики. По результатам измерений разработана конструкция низкофонового ТГЭУ для работы в режиме счета одноэлектронных импульсов.
Письма в журнал технической физики, 2010, том 36, вып.13, с.16

Исследование метода регистрации солнечных нейтрино с помощью литиевого детектора
А.В.Копылов, И.В.Орехов, В.В.Петухов, А.Е.Соломатин, ИЯИ РАН
На лабораторной стендовой установке разработан метод регистрации солнечных нейтрино с помощью литиевого детектора. Получен коэффициент извлечения бериллия из лития 96.4% и показано, что потери лития за время процедуры извлечения составляют менее 1%. Полученные результаты полномасштабного эксперимента массой 10 t, состоящего из 20 модулей по 500 kg лития каждый. Технические решения, сформулированные по результатам этой работы, позволяют приступить к созданию пилотной установки на 500 kg лития.
Журнал технической физики, 2009, том 79, вып.7, с.133

Neutrino fluxes from CNO cycle in the Sun in the non stationary case with mixing
A.Kopylov, V.Petukhov, Institute for Nuclear Research of RAS
Lithium detectors have a high sensitivity to CNO neutrinos from the Sun. The calculated deviations of the mean molecular weight and the abundances of hydrogen, helium etc. from the standard values are presented for the non stationary case with mixing of the solar model when the neutrino flux F₁₃ from the decay of ¹³N is higher than a standard model predicts. The inferences for the future experiments are made, particularly for a lithium radiochemical detector.
JCAP08(2009)006

Prospects for studying the solar CNO cycle by means of a lithium neutrino detector
A.Kopylov, V.Petukhov, Institute for Nuclear Research of RAS
Lithium detectors have a high sensitivity to CNO neutrinos from the Sun. The present experimental data and prospects for future experiments on the detection of CNO neutrinos are discussed. A nonstationary case is considered when the flux of ¹³N neutrinos is higher than the standard solar model predicts due to the influx of fresh material from the peripheral layers to the solar core.
JCAP10(2008)007

On the Mass Eigenstate Composition of the ₈B Neutrinos from the Sun
A.Kopylov, V.Petukhov, Institute for Nuclear Research of RAS
The present data from gallium experiments provide indirectly the experimental limit on the fraction of &nu₂ mass eigenstates for the ₈B neutrinos from the Sun. However, if we are to use the experimental data alone, the fraction of &nu₂ and, consequently, sin₂&theta₁₂ can still be varied over a rather broad range. Further experimental efforts are needed to clarify this point.
JCAP04(2007)002

A lithium experiment in the program of solar neutrino research
A.Kopylov, I.Orekhov, V.Petukhov, A.Solomatin, Institute for Nuclear Research of RAS
Experiments sensitive to pp neutrinos from the Sun are very promising for precise measurement of the mixing angle \theta_{12}. A ?e ? scattering experiment (XMASS) and/or a charged-current experiment (indium detector) can measure the flux of electron pp neutrinos. One can find the total flux of pp neutrinos from a luminosity constraint after the contributions of 7Be and CNO neutrinos to the total luminosity of the Sun are measured. A radiochemical experiment utilizing a lithium target has high sensitivity to the CNO neutrinos; thus, it has a good promise for precise measurement of the mixing angle and for a test of the current theory of evolution of the stars.
Physics of Atomic Nuclei, Volume 69, Number 11, November, 2006 hep-ph/0601091

Физическое обоснование литиевого эксперимента.
А.В.Копылов, И.В.Орехов, В.В.Петухов, А.Е.Соломатин, ИЯИ РАН
A lithium detector is very efficient to measure the flux of CNO neutrinos from the Sun. Using a luminosity constrain it will be possible also to determine the total flux of pp-neutrinos with the uncertainty of about 1% if the flux of CNO neutrinos is measured by the accuracy of about 30%. For this one needs to measure the production rate from solar neutrinos with the accuracy on the level of 10%. This can be obtained within 5 years of measurements by using a 10 tons lithium target. Usually the experiments on solar neutrinos are conducted during 10 years or more.
Письма в ЭЧАЯ, т.4 №4(140) 2007
Письма в ЭЧАЯ