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1.
We present novel calculations of the magnetic dichroism appearing in molecular bands in the presence of a strong magnetic field, which perturbs the internal structure of the molecule and results in net polarization due to the Paschen-Back effect. Based on that, we analyze new spectropolarimetric observations of the cool magnetic helium-rich white dwarf G99-37, which shows strongly polarized molecular bands in its spectrum. In addition to previously known molecular bands of the C2 Swan and CH A-X systems, we find a firm evidence for the violet CH B-X bands at 390 nm and C2 Deslandres-d'Azambuja bands at 360 nm. Combining the polarimetric observations with our model calculations, we deduce a dipole magnetic field of 7.5+/-0.5 MG with the positive pole pointing towards the Earth. We conclude that the developed technique is an excellent tool for studying magnetic fields on cool magnetic stars. 相似文献
2.
V. M. Aulchenko M. N. Achasov S. E. Baru K. I. Beloborodov A. V. Berdyugin A. G. Bogdanchikov A. V. Bozhenok A. D. Bukin D. A. Bukin A. V. Vasilev V. B. Golubev T. V. Dimova V. P. Druzhinin V. N. Ivanchenko I. A. Koop A. A. Korol S. V. Koshuba A. P. Lysenko A. V. Otboev E. V. Pakhtusova A. A. Salnikov S. I. Serednyakov V. A. Sidorov Z. K. Silagadze V. V. Shary Yu. M. Shatunov 《Journal of Experimental and Theoretical Physics》2003,97(1):24-33
The process e + e ? → η′γ, η′ → η π0π0, η → γγ is investigated by an SND detector in experiment on a VEPP-2M equipment with colliding electron-positron beams. The analysis of experimental data yields a value of B(? → η′γ)=(6.7 ?4.2 +5.0 ±1.5)×10?5 for the decay probability. Taking into account a previous measurement of this quantity by an SND detector in the decay channel η′ → π+π?η, one finally obtains B(?→η ′γ)=(6.7 ?2.4 +2.8 ±0.8)×10?5. 相似文献
3.
Achasov M. N. Barnyakov A. Yu. Baykov A. A. Beloborodov K. I. Berdyugin A. V. Bogdanchikov A. G. Botov A. A. Golubev V. B. Dimova T. V. Druzhinin V. P. Zhabin V. N. Kardapoltsev L. V. Kovrizhin D. P. Korol A. A. Kupich A. S. Martin K. A. Melnikova N. A. Muchnoi N. Yu. Obrazovsky A. E. Pakhtusova E. V. Pugachev K. V. Savchenko Ya. S. Serednyakov S. I. Silagadze Z. K. Surin I. K. Usov Yu. V. Kharlamov A. G. Shtol D. A. 《Physics of Atomic Nuclei》2021,84(2):197-200
Physics of Atomic Nuclei - The process $$e^{+}e^{-}\to\eta\pi^{0}\gamma$$ is studied in the range of center-of-mass (c.m.) collision energies between 1.05 and 2.00 GeV on the basis of data... 相似文献
4.
Achasov M. N. Barnyakov A. Yu. Barnyakov M. Yu. Beloborodov K. I. Berdyugin A. V. Bogdanchikov A. G. Botov A. A. Buzykaev A. R. Golubev V. B. Dimova T. V. Druzhinin V. P. Kardapoltsev L. V. Kovrizhin D. P. Korol A. A. Kravchenko E. A. Kupich A. S. Martin K. A. Melnikova N. A. Obrazovsky A. E. Onuchin A. P. Pakhtusova E. V. Pugachev K. V. Serednyakov S. I. Silagadze Z. K. Surin I. K. Usov Yu. V. Kharlamov A. G. Shtol D. A. 《Physics of Atomic Nuclei》2021,84(1):59-62
Physics of Atomic Nuclei - In an experiment with the SND detector at the VEPP-2000 $$e^{+}e^{-}$$ collider, the cross sections for the processes $$e^{+}e^{-}\to K^{+}K^{-}\pi^{0}$$ and... 相似文献
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6.
V. V. Berdyugin P. P. Shorygin K. Ya. Burshtein Yu. V. Korshak M. A. Tlenkopachev A. V. Orlov 《Russian Chemical Bulletin》1996,45(8):1912-1916
Specific features of the excitation spectra of resonance Raman (RR) lines in multimode systems were characterized. Based on this, the spectra, the structure, and the composition of polyacetylene (PA) synthesized by polymerization of cycloocta-1,3,5,7-tetraene in the presence of metathesis catalysts were investigated. A dependence of frequencies and intensities of the C-C and C=C stretching lines on the exciting light wavelength was found and explained by broad distribution of defect-free conjugated polymer segments in the PA samples studied on the number of double bonds incorporated in them. A procedure for the calculation of the distribution functions and of the shapes of RR lines was proposed. These functions are bimodal. A reversiblecis-trans-transition was discovered in the PA samples not subjected to heat treatment, which was attributed to the presence of macrocyclic polyene structures.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 2016–2020, August, 1996. 相似文献
7.
M. N. Achasov K. I. Beloborodov A. V. Berdyugin A. G. Bogdanchikov D. A. Bukin A. V. Vasil’ev V. B. Golubev T. V. Dimova V. P. Druzhinin I. A. Koop A. A. Korol’ S. V. Koshuba E. V. Pakhtusova S. I. Serednyakov Z. K. Silagadze A. N. Skrinsky Yu. M. Shatunov 《Journal of Experimental and Theoretical Physics》2010,110(1):26-33
We have searched for the process e+e- → K+K-π0 at energies up to 1.38 GeVin an experiment with the spherical neutral detector at the VEPP-2M e+e- collider. The upper limits of the cross sections for the processes σ(e+e →; φπ: → K+K-π0) < 0.023 nb and σ(e+e- → KK*(892) → K+K-π0) < 0.059 nb have been established at a 95% confidence level. 相似文献
8.
M. N. Achasov K. I. Beloborodov A. V. Berdyugin A. G. Bogdanchikov D. A. Bukin A. V. Vasil’ev V. B. Golubev T. V. Dimova V. P. Druzhinin I. A. Koop A. A. Korol’ S. V. Koshuba E. V. Pakhtusova S. I. Serednyakov Z. K. Silagadze A. N. Skrinsky Yu. M. Shatunov D. A. Shtol’ 《JETP Letters》2010,92(2):80-84
The e + e ? → ηπ+π? cross section in the η → 2γ channel has been measured in the $ \sqrt s $ = 1.04- to 1.38-GeV energy range. The data with a total integrated luminosity of 9.05 pb?1 were collected on a spherical neutral detector at the VEPP-2M collider. The results are consistent with the BaBar and CMD2 data and have a higher statistical accuracy. 相似文献
9.
M. N. Achasov K. I. Beloborodov A. V. Berdyugin A. V. Bozhenok D. A. Bukin T. V. Dimova V. P. Druzhinin V. B. Golubev I. A. Koop A. A. Korol S. V. Koshuba A. P. Lysenko A. V. Otboev E. V. Pakhtusova S. I. Serednyakov Yu. M. Shatunov V. A. Sidorov Z. K. Silagadze A. N. Skrinsky A. V. Vasiljev 《Journal of Experimental and Theoretical Physics》2006,103(5):720-727
We present a measurement of the e
+
e
− → K
S
K
L cross section in the energy range √s = 1.04−1.38 GeV. For an energy of √s ≥ 1.2 GeV the cross section exceeds vector meson dominance model predictions with only ρ(770), ω(783), and ϕ(1020) mesons
taken into account. The measured cross section agrees well with previous measurements.
Published in Russian in Zhurnal éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2006, Vol. 130, No. 5, pp. 831–839.
This article was translated by the authors. 相似文献
10.
V. M. Aulchenko M. N. Achasov K. I. Beloborodov A. V. Berdyugin A. G. Bogdanchikov A. V. Bozhenok A. D. Bukin D. A. Bukin S. V. Burdin A. V. Vasiljev I. A. Gaponenko V. B. Golubev T. V. Dimova A. A. Drozdetsky V. P. Druzhinin M. S. Dubrovin P. M. Ivanov V. N. Ivanchenko I. A. Koop A. A. Korol S. V. Koshuba G. A. Kukartsev A. P. Lysenko A. V. Otboev E. V. Pakhtusova A. A. Salnikov S. I. Serednyakov V. A. Sidorov Z. K. Silagadze A. N. Skrinsky V. V. Shary Yu. M. Shatunov 《Journal of Experimental and Theoretical Physics》2000,90(6):927-938
The reaction e + e ?→ωπ0 near a Φ resonance was studied with a spherical neutral detector at VEPP-2M e + e ? collider. Both main modes of decay of a ω meson were investigated: ω→π+π?π0 and ω→π 0γ. The probability of decay Φ→ωπ0 was obtained from the magnitude of the interference wave in the cross section for the reaction e + e ?→ωπ0→ π+π?π0π0: B(Φ→ωπ0) = (5.5 ?1.4 +1.6 ±0.3) ×10?5. The ratio of the partial widths of the ω meson was obtained from the ratio of the cross sections for the two modes: Γ(ω→π0γ )/Γ(ω→π+π?π0) = 0.0994 ± 0.0036 ± 0.0038. 相似文献