首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   29篇
  免费   0篇
化学   3篇
力学   1篇
数学   2篇
物理学   23篇
  2020年   1篇
  2018年   1篇
  2017年   1篇
  2015年   1篇
  2009年   1篇
  2008年   1篇
  2007年   2篇
  2006年   1篇
  2005年   2篇
  2002年   2篇
  2001年   2篇
  1998年   1篇
  1995年   2篇
  1993年   1篇
  1992年   2篇
  1989年   1篇
  1987年   1篇
  1986年   1篇
  1984年   2篇
  1981年   1篇
  1974年   2篇
排序方式: 共有29条查询结果,搜索用时 31 毫秒
1.
With a germanium detector array (Hyperball), we observed two gamma-ray peaks corresponding to the two transitions (5/2(+)-->1/2(+) and 3/2(+)-->1/2(+)) in the (9)(Lambda)Be hypernucleus which was produced by the 9Be(K-,pi(-)) reaction. The energies of the gamma rays are 3029 +/- 2 +/- 1 keV and 3060 +/- 2 +/- 1 keV. The energy difference was measured to be 31.4(+2.5)(-3.6) keV, which indicates a very small Lambda-spin-dependent spin-orbit force between a Lambda and a nucleon. This is the smallest level splitting by far ever measured in a hypernucleus.  相似文献   
2.
An experiment performed with the GAMS-4π spectrometer resulted in observing 235 ± 45 events of the decay η′ → 3π 0. The respective charge-exchange reaction at a momentum of 32.5 GeV/c was used as a source of η′ mesons. The decay branching ratio was found to be Br(η′ → 3π 0) = (1.8 ± 0.4) × 10?3. The slope parameter of the square of the respective matrix element in the linear approximation proved to be β = ?0.59 ± 0.18.  相似文献   
3.
The ηη system produced in charge-exchange π ? p interaction at a momentum of 32.5 GeV/c is studied in an experiment performed with the GAMS-4π spectrometer at the 70-GeV accelerator of the Institute for High-Energy Physics (IHEP, Protvino). A partial-wave analysis is performed in the mass range between 1.1 and 3.9 GeV for ?t <0.2 (GeV/c)2, S, D, G, and J waves being taken into account in this analysis. The S wave has a complicated structure, displaying peaks at about 1.5 and 1.7 GeV. These peaks are associated with the f 0(1500) and f 0(1710) mesons. One of the solutions (preferable one) involves the f 0(2200) and f 2(1950) resonances. The mass region above 2.4 GeV is dominated by the G wave. A broad state of mass about 3 GeV and width 0.7 GeV is found in the J wave. The parameters of the resonances in question and their production cross sections are measured.  相似文献   
4.
A partial-wave analysis of the ω ωπ0-system produced in the π- p→ωπ0 n reaction at 38 GeV/c beam momentum has been performed. A new 5?- meson state,ρ 5(22350), with a massM=2330±35 MeV and a width Γ=400±100 MeV, is observed. The analysis also confirms the 1?- ρ(2150) meson, a radial-orbital excitation of the ρ(770), observed earlier by the GAMS Collaboration.  相似文献   
5.
This paper describes the results of measuring the temperatures of gaseous and liquid reacting media, which was carried out by the thermocouple method with the use of a battery (copper–Constantan–copper) of planar thermocouples, placed in the medium under study. It is shown that convective heat transfer lasting for 0.5–1.5 μs equalizes the temperatures of the “hot” thermocouple junctions and the environment. The relationship between the voltage occurring on the thermobattery during this heating and time was determined using a pulse oscilloscope. The measured maximum voltage was used to determine the temperature of the medium. A series of experiments was carried out on measuring the temperatures of water and emulsion explosive matrix, which were compressed by a shock wave, as well as the detonation products of ammonite with sodium hydrogen carbonate at various mass ratios. The estimates of heat fluxes from the detonation products to the metallic surfaces of the thermobattery contacting with them are obtained.  相似文献   
6.
7.
Burtovoy  V. S.  Akimenko  S. A.  Artamonov  A. V.  Blik  A. M.  Brekhovskikh  V. V.  Gorin  A. M.  Donskov  S. V.  Inyakin  A. V.  Kolosov  V. N.  Kurshetsov  V. F.  Lishin  V. A.  Medynsky  M. V.  Mikhailov  Yu. V.  Obraztsov  V. F.  Polyakov  V. A.  Romanovsky  V. I.  Rykalin  V. I.  Sadovsky  A. S.  Samoilenko  V. D.  Stenyakin  O. V.  Uvarov  V. A.  Filin  A. P.  Khaustov  G. V.  Kholodenko  S. A.  Tchikilev  O. G.  Yushchenko  O. P.  Guschin  E. N.  Duk  V. A.  Kravtsov  V. I.  Kudenko  Yu. G.  Polyarush  A. Yu.  Filippov  S. N.  Khudyakov  A. A.  Bychkov  V. N.  Zalikhanov  B. Zh.  Kekelidze  G. D.  Lysan  V. M. 《Journal of Experimental and Theoretical Physics》2020,131(6):928-939
Journal of Experimental and Theoretical Physics - On the statistics of ~1.7 × 108 interactions of positively charged kaons on copper nuclei, coherent events of the K+π0 system production...  相似文献   
8.
The production of 0 system in p charge-exchange interactions at momenta 38 GeV/c and 100 GeV/c has been studied. The 2 and 0 0 decay modes of leading to 4 and 8 final states respectively have been detected. No statistically significant peak is observed in the 0 mass spectrum in the range of 1.2 GeV÷2.1 GeV. An upper limit of 6·10–3 has been established for thea 2 0 (1320) 0 branching ratio.  相似文献   
9.
The spin-orbit splitting of Lambda single-particle states in (13)(Lambda)C was measured. The 13C(K-,pi(-))(13)(Lambda)C reaction was used to excite both the 1/2(-) and 3/2(-) states simultaneously, which have predominantly 12C(0(+)) x p(Lambda) configuration. gamma rays from the states to the ground state were measured in coincidence with the pi(-)'s, by which ls splitting was found to be 152+/-54(stat)+/-36(syst) keV. The value is 20-30 times smaller than exhibited by the ls splitting in the nuclear shell model. This value gives us new insight into the YN interaction.  相似文献   
10.
An experiment demonstrating the production of double-Lambda hypernuclei in (K(-),K(+)) reactions on (9)Be was carried out at the D6 line in the BNL alternating-gradient synchrotron. The technique was the observation of pions produced in sequential mesonic weak decay, each pion associated with one unit of strangeness change. The results indicate the production of a significant number of the double hypernucleus (4)(double Lambda)H and the twin hypernuclei (4)(Lambda)H and (3)(Lambda)H. The relevant decay chains are discussed and a simple model of the production mechanism is presented. An implication of this experiment is that the existence of an S = -2 dibaryon more than a few MeV below the double Lambda mass is unlikely.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号