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Том 88, № 5 (2025)

Жылы: 2025
Мақалалар: 5
URL: https://journals.rcsi.science/0044-0027/issue/view/24949

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Ашық рұқсат
Рұқсат жабық

Рұқсат берілді
Рұқсат жабық

Тек жазылушылар үшін

ЯДРА. Теория

Semi-empirical formula for spontaneous fission half-life calculation

Moiseev N., Antonenko N., Adamian G.

Аннотация

This work presents a new phenomenological approach for predicting the spontaneous fission half-lives of actinides and superheavy nuclei. A linear dependence between the decimal logarithm of the spontaneous fission half-life $log_{10} T_{1/2 SF}$ and the energy release $Q_{α}$ of alpha decay is found for nuclei with fixed neutron excess $N - Z$ and atomic numbers in the range $90 \leq Z \leq 102$ . Based on this correlation, a semi-empirical formula is proposed for the spontaneous fission half-life of even–even nuclei as a function of $Q_{α}$ and $N - Z$ . The proposed formula is further extended to predict half-lives for odd-A, odd–odd nuclei, and nuclei with $Z \geq 103$ . The formula demonstrates good agreement with experimental data, reproducing the half-lives of 111 known nuclei with a mean deviation of 1.00 order of magnitude. Predictions of the new formula are compared with results obtained using other empirical formulas and microscopic–macroscopic and self-consistent microscopic models. An analysis of the influence of different mass tables on the accuracy of the predictions is performed. The possible fundamental relationship between spontaneous fission and alpha-decay process is discussed.

Көрсету

Жасыру

Physics of Atomic Nuclei. 2025;88(5):381-399

381-399

(Rus)

(JATS XML)

ЭЛЕМЕНТАРНЫЕ ЧАСТИЦЫ И ПОЛЯ. Эксперимент

State of the Art on Search for Astrophysical Neutrinos with Baikal-GVD

Suvorova O., Avrorin A., Avrorin A., Aynutdinov V., Allakhverdyan V., Belolaptikov I., Benusová Z., Bondarev E., Borina I., Budnev N., Gafarov A., Golubkov K., Gress T., Dvornický R., Dzhilkibaev Z., Dik V., Dmitrieva A., Domogatsky G., Doroshenko A., Dyachok A., Elzhov T., Zaborov D., Zavyalov S., Zvezdov D., Kebkal V., Kebkal K., Kozhin V., Kolbin M., Koligaev S., Konischev K., Korobchenko A., Koshechkin A., Kruglov M., Kulepov V., Kulikov A., Lemeshev Y., Lisitsin M., Lovtsov S., Mirgazov R., Naumov D., Nikolaev A., Perevalova I., Petukhov D., Petrukhin A., Pliskovsky E., Rozanov M., Ryabov E., Safronov G., Sirenko A., Skurikhin A., Solovjev A., Sorokovikov M., Stromakov A., Tabolenko V., Tretyak V., Ulzutuev B., Fomin V., Kharuk I., Khokhlov S., Khramov E., Chadymov V., Chepurnov A., Shaybonov B., Šimkovic F., Shirokov E., Shishkin V., Štekl I., Eckerová E., Yablokova Y.

Аннотация

An overview of the experimental results of the Baikal-GVD gigaton-scale deep-sea neutrino telescope during its construction from 2016 to the present, 2025 is presented. According to Baikal-GVD data, over 6 years of observations, the presence of an astrophysical component in the diffuse neutrino flux, measured with cascades in the TeV–PeV energy range, has been confirmed at a level of more than 5s. Wediscuss the spectral analysis of the sample of high-energy neutrinos, the galactic origin of neutrinos with energies above 200 TeV, the first results in upper limits on the flux of cosmogenic neutrinos, and real-time data analysis in frame of multimessenger program.

Көрсету

Жасыру

Physics of Atomic Nuclei. 2025;88(5):400-410

400-410

(Rus)

(JATS XML)

Registration of Atmospheric Muons at LVD

Agafonova N., Ashikhmin V., Dobrynina E., Enikeev R., Shakiryanova I., Yakushev V., Grigoryeva A., Slutskaya O.

Аннотация

The paper presents the results of studies related to the characteristics of reconstructed archive muon events of the LVD experiment located in the Gran Sasso Laboratory. The reconstruction of the direction of atmospheric muons was carried out using the detector¢stracking system, which operated on two towers since 1999 to 2002. The distributions of specific energy losses in the detector are presented depending on the soil thickness and the zenith angle of the reconstructed muons.

Көрсету

Жасыру

Physics of Atomic Nuclei. 2025;88(5):411-417

411-417

(Rus)

(JATS XML)

The Problem of the Coplanarity of Energy Flows in EAS Cores

Mukhamedshin R.

Аннотация

The effect of the tendency towards the coplanar arrival of the most energetic particles and/or groups of particles in gamma–hadron families, observed in high-altitude and stratospheric experiments withX-ray emulsion chambers, is discussed. The experimental data are compared with calculations carried out within the framework of various versions of the FANSY 2.0 model, one of the versions of which reproduces the coplanar generation of the most energetic particles in hadron interactions at superhigh energies. The entire set of experimental data on the azimuthal characteristics ofg-ray−hadron families observed at levels of 25, 75, and 600 g/cm2 in the atmosphere cannot be explained even within the framework of the FANSY 2.0/2D model, which uses the hypothesis of a connection between coplanarity and the local 3D ↔ 2D evolution of the metric signature at ultrahigh energies.

Көрсету

Жасыру

Physics of Atomic Nuclei. 2025;88(5):418-426

418-426

(Rus)

(JATS XML)

PHELEX — Present Status

Kopylov A., Orekhov I., Petukhov V., Solomatin A.

Аннотация

This paper presents the results of measurements of diurnal variations in the single electron count rate arising from dark photon conversion at the cathode of a gas proportional counter. Three experimental series were conducted, each consisting of 4 runs lasting approximately 60 days per run. One can expect an excess in the single electron count rate above the average level if the polarization vector of dark photons in the region traversed by the Sun forms an angle between 20° and 50° with the Earth¢srotational axis. Such an effect was observed in the first series (significance 6s) and the second series (significance 4s). However, in the third series, which employed two identical detectors simultaneously, the effect was not observed on either detector. This result practically excludes the possibility that the effect observed earlier was purely instrumental. The results of the three series may be interpreted as a possible effect arising from the Sun¢spassage through regions of dark matter characterized by different orientations of the dark photon polarization vector.

Көрсету

Жасыру

Physics of Atomic Nuclei. 2025;88(5):427-432

427-432