排序方式: 共有28条查询结果,搜索用时 31 毫秒
1.
Yu. B. Gurov S. V. Lapushkin V. G. Sandukovsky B. A. Chernyshev 《Physics of Atomic Nuclei》2017,80(10):1596-1605
The characteristics of two modifications of the semiconductor (s.c.d.) setup consisting of telescopes on the basis of silicon detectors are presented. These settings allow performing a precision measurement of energy in a large dynamic range (from a few to hundreds of MeV) and particle identification in a wide range of masses. The issues of measurement of the characteristics of s.c.d. telescopes and their impact on the quality of the obtained experimental data are considered. Considerable attention is paid to the use of created semiconductor devices for the search for and spectroscopy of light exotic nuclei on the accelerators of PNPI (Gatchina) and LANL (Los Alamos). 相似文献
2.
Gurov Yu. B. Lapushkin S. V. Leonova T. I. Tel’kushev M. V. Chernyshev B. A. Sandukovsky V. G. 《Physics of Atomic Nuclei》2020,83(3):377-383
Physics of Atomic Nuclei - A survey of experimental results on the level structure in the heavy helium isotope $${}^{6}$$ He that were obtained in reactions induced by stopped pion absorption in... 相似文献
3.
Yu. B. Gurov D. V. Aleshkin S. V. Lapushkin P. V. Morokhov A. V. Panin V. A. Pechkurov N. O. Poroshin V. G. Sandukovsky M. V. Tel’kushev B. A. Chernyshev 《JETP Letters》2003,78(4):183-187
An experimental search for the superheavy hydrogen isotope 6H was conducted through studying the absorption of stopped π?-mesons by 9Be and 11B nuclei. A structure in the missing mass spectrum caused by the resonance states of 6H was observed in three reaction channels, namely, 9Be(π?, pd)X, 11B(π?, d3He)X, and 11B(π?, p4He)X. The parameters of the lowest state Er=6.6±0.7 MeV and Γ=5.5±2.0 MeV (Er is the resonance energy with respect to the disintegration into the triton and three neutrons) are evidence that 6H is a more weakly bound system than 4H and 5H. Three excited states of 6H were observed. Their resonance levels (E1r=10.7±0.7 MeV, Γ1r=4±2 MeV, E2r=15.3±0.7 MeV, Γ 2r=3±2 MeV, and E3r=21.3±0.4 MeV, Γ3r=3.5±1.0 MeV) are energetically capable of disintegrating into six free nucleons. 相似文献
4.
Yu. B. Gurov V. S. Karpukhin S. V. Lapushkin I. V. Laukhin V. A. Pechkurov V. G. Sandukovsky B. A. Chernyshev 《Bulletin of the Russian Academy of Sciences: Physics》2009,73(2):139-142
The results of searching for production of superheavy hydrogen isotopes 4,5H in reactions of absorption of stopped π? mesons by 10,11B nuclei are reported. A peak near 3 MeV was observed in the missing mass spectra measured in the reactions 10,11B(π?, t4He)X, 10B(π?, d4He)X, and 10B(π?, t3He)X. A structure caused by two 5H states with the resonance energies E R = 5.2 and 10.4 MeV was observed in the missing mass spectra measured in the reactions 11B(π?, d4He)X, 11B(π?, t3He)X, and 10B(π?, d3He)X. 相似文献
5.
Yu. B. Gurov L. Yu. Gèant-Korotkova V. S. Karpukhin S. V. Lapushkin T. I. Leonova R. V. Pritula V. G. Sandukovsky B. A. Chernyshev 《Bulletin of the Russian Academy of Sciences: Physics》2018,82(6):678-681
Helium 5Hе states are sought in missing-mass (MM) spectra from reactions of the absorption of stopped pions: 10В(π?, dt)Х and 11В(π?, tt)Х. The experiment is conducted using the LANL accelerator equipped with a two-arm semiconductor charged-particle spectrometer. The parameters of the ground state agree with the literature data. The best fit for the first excited level is obtained at Er = 1.8(5) MeV and Γ = 4.7(7) MeV. Neither of the two reactions produce statistically significant evidence for the presence of highly excited (Ex ≥ 20 MeV) states of 5Hе. 相似文献
6.
Yu. B. Gurov K. N. Kovalev L. Yu. Korotkova S. V. Lapushkin R. V. Pritula V. G. Sandukovsky B. A. Chernyshev 《Bulletin of the Russian Academy of Sciences: Physics》2014,78(5):355-357
Correlation measurements of the reaction of stopped pion absorption 11B(π?, tt)X are made with a semiconductor double-arm charged particle spectrometer on a low-energy pion beam at the LAMPF meson factory. Analysis of a two-dimensional Dalitz plot and the momentum distribution of the residual nucleus allows us to identify the absorption of pions in a 6Li intranuclear cluster and demonstrate the configuration 6Li + 5Heg.s is present in the 11B nucleus. 相似文献
7.
Yu. B. Gurov M. N. Behr D. V. Aleshkin B. A. Chernyshev S. V. Lapushkin P. V. Morokhov V. A. Pechkurov N. O. Poroshin V. G. Sandukovsky M. V. Tel’kushev 《The European Physical Journal A - Hadrons and Nuclei》2005,24(2):231-236
The superheavy hydrogen isotopes 4H and 5H have been investigated in the stopped pion absorption on 9Be. Three states of 4H were proposed in the reaction channel 9Be( { - }, dt)X. Four states of 5H were proposed in the reaction channels 9Be({ - }, pt)X and 9Be({ - }, dt)X. The excited states of 5H can decay into free nucleons. 相似文献
8.
Yu. B. Gurov L. Yu. Korotkova S. V. Lapushkin D. S. Markov V. G. Sandukovsky B. A. Chernyshev T. D. Shchurenkova 《Bulletin of the Russian Academy of Sciences: Physics》2013,77(4):366-369
Highly excited states of the 8Li isotope are sought in absorption reactions of π? mesons stopped by 10,11B isotopes. The ground and three excited states of the 8Li isotope are observed in inclusive measurements of reactions 10B(π?, d)X and 11B(π?, t)X. The states with excitation energies E x ≈ 8.7 and 10.1 MeV are observed for the first time in correlation measurements of reactions 10B(π?, dt)X and 11B(π?, tt)X. 相似文献
9.
Yu. B. Gurov L. Yu. Korotkova S. V. Lapushkin R. V. Pritula V. G. Sandukovsky M. V. Tel’kushev B. A. Chernyshev T. D. Schurenkova 《Physics of Atomic Nuclei》2016,79(4):525-533
The results based on the spectroscopy of superheavy hydrogen isotopes (4?7H), heavy helium isotopes (6,7He), and heavy lithium isotopes (7?12Li) produced in stopped pion absorption by light nuclei were analyzed. Search for nuclear states was performed in inclusive and correlation measurements of missing mass spectra. A broad range of excitation energies studied in correlation measurements provided the possibility of search for isobaric analog states and cluster resonances. A comparison with experimental and theoretical results of other authors was conducted. 相似文献
10.
Yu. B. Gurov L. Yu. Korotkova S. V. Lapushkin R. V. Pritula V. G. Sandukovsky B. A. Chernyshev T. D. Schurenkova 《Bulletin of the Russian Academy of Sciences: Physics》2014,78(5):358-360
The structure of excited levels in the 7Li isotope is studied via inclusive and correlation measurements in the stopped π? meson absorption reactions 10B(π?, t)X and 12C(π?, dt)X, respectively. The experiment is conducted using a low-energy pion beam at the LAMPF meson factory. Analysis of the missing mass spectra reveals 7Li states with the resonance parameters (E x , Γ) (4.7, 0.1), (6.6, 0.9), (7.3, 0.1), (9.1, 2.8), and (9.6, 0.4) MeV. A highly excited state with E x ≈ 11.2 MeV (i.e., an isobar analog of 7He) is observed in the 10B(π?,t)X reaction. An excited state with E x = 10.3 ± 0.1 MeV and γ = 1.8 ± 0.4 Mev is observed for the first time in the 12C(π?,dt)X reaction. 相似文献