全文获取类型
收费全文 | 101篇 |
免费 | 0篇 |
国内免费 | 2篇 |
专业分类
化学 | 9篇 |
物理学 | 94篇 |
出版年
2020年 | 1篇 |
2018年 | 1篇 |
2017年 | 1篇 |
2016年 | 1篇 |
2015年 | 1篇 |
2014年 | 1篇 |
2013年 | 2篇 |
2012年 | 3篇 |
2010年 | 4篇 |
2009年 | 3篇 |
2008年 | 2篇 |
2007年 | 6篇 |
2006年 | 5篇 |
2005年 | 2篇 |
2004年 | 4篇 |
2003年 | 12篇 |
2002年 | 5篇 |
2001年 | 8篇 |
2000年 | 3篇 |
1999年 | 1篇 |
1997年 | 6篇 |
1996年 | 5篇 |
1995年 | 3篇 |
1994年 | 5篇 |
1993年 | 1篇 |
1992年 | 3篇 |
1990年 | 1篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1976年 | 3篇 |
1974年 | 1篇 |
排序方式: 共有103条查询结果,搜索用时 15 毫秒
31.
V. Chudoba A. S. Fomichev M. S. Golovkov A. V. Gorshkov V. A. Gorshkov L. V. Grigorenko S. A. Krupko Yu. Ts. Oganessian A. M. Rodin S. I. Sidorchuk R. S. Slepnev S. V. Stepantsov G. M. Ter-Akopian R. Wolski A. A. Korsheninnikov E. Yu. Nikolskii V. A. Kuzmin B. G. Novatskii D. N. Stepanov P. Roussel-Chomaz W. Mittig V. Bouchat V. Kinnard T. Materna F. Hanappe O. Dorvaux L. Stuttge 《The European physical journal. Special topics》2008,162(1):161-164
The spectrum of 10He was studied by means of the 3H(8He, p)10He reaction at a laboratory energy of 25 MeV/A and small center-of-mass angles. Missing mass spectrum of 10He was derived from the obtained p-8He coincidence. A resolution of 0.7 MeV was achieved in this spectrum for the measured 10He energy. Most likely, a well isolated group of 10 events detected between 2 and 5 MeV and showing a maximum at about 3 MeV
in the spectrum of the present work exhibits the 10He g.s. resonance. 相似文献
32.
33.
A. V. Yeremin A. V. Belozerov M. L. Chelnokov V. I. Chepigin V. A. Gorshkov A. P. Kabachenko O. N. Malyshev Yu. Ts. Oganessian A. G. Popeko R. N. Sagaidak A. I. Svirikhin S. Hofmann G. Berek I. Brida S. Saro 《Physics of Atomic Nuclei》2003,66(6):1042-1052
Within the past twelve years, the recoil separator VASSILISSA has been used for the investigations of evaporation residues produced in heavy-ion-induced complete fusion reactions. In the course of the experimental work, fourteen new isotopes have been identified by the parent-daughter correlations in the region of elements with 92≤Z≤94. The study of the decay properties and formation cross sections of the isotopes of elements 110, 112, and 114 was performed using high-intensity 48Ca beams and 232Th, 238U, and 242Pu targets. At the beam energies corresponding to the calculated cross-section maxima of the 3n evaporation channels, the isotopes 277110, 283112, and 287114 were produced and identified. For further experiments aimed at the synthesis of the superheavy element isotopes (Z≥110) with the use of intensive 48Ca extracted beams, improvements in the ion optical system of the separator and the focal plane detector system have been made. 相似文献
34.
Yu.Ts. Oganessian V.K. Utyonkov Yu.V. Lobanov F.Sh. Abdullin A.N. Polyakov I.V. Shirokovsky Yu.S. Tsyganov G.G. Gulbekian S.L. Bogomolov B.N. Gikal A.N. Mezentsev S. Iliev V.G. Subbotin A.M. Sukhov O.V. Ivanov G.V. Buklanov K. Subotic A.A. Voinov M.G. Itkis K.J. Moody J.F. Wild N.J. Stoyer M.A. Stoyer R.W. Lougheed C.A. Laue 《The European Physical Journal A - Hadrons and Nuclei》2002,15(1-2):201-204
This paper presents results of the experiments aimed at producing long-lived superheavy elements located near the spherical-shell
closures with Z ⩾ 114 and N ⩾ 172 in the 244Pu + 48Ca and 248Cm + 48Ca reactions. The large measured α-particle energies of the newly observed nuclei, together with the long decay times and
spontaneous fission terminating the chains, offer evidence of the decay of nuclei with high atomic numbers. The decay properties
of the synthesized nuclei are consistent with the consecutive α-decays originating from the parent nuclides 288, 289114 and 292116, produced in the 3n and 4n evaporation channels with cross-sections of about a picobarn. The present observations can be considered as experimental
evidence of the existence of the “island of stability” of superheavy elements.
Received: 21 March 2002 / Accepted: 16 May 2002 / Published online: 31 October 2002
RID="a"
ID="a"e-mail: utyonkov@sungns.jinr.ru 相似文献
35.
36.
G. M. Ter-Akopian A. A. Bezbakh R. Wolski M. S. Golovkov A. V. Gorshkov V. A. Gorshkov L. V. Grigorenko I. A. Egorova G. Kaminski S. A. Krupko Yu. Ts. Oganessian Yu. L. Parfenova S. I. Sidorchuk R. S. Slepnev L. Standylo S. V. Stepantsov A. S. Fomichev V. Chudoba 《Bulletin of the Russian Academy of Sciences: Physics》2012,76(11):1172-1176
The ACCULINNA-2 separator is intended to provide beams of exotic nuclei with Z = 1?30, energies of 10?C50 MeV/amu, and intensities that allow one to study excitation spectra and decay dynamics of neutron- and proton-drip nuclei. Examples from studies of the 10He and 6Be nuclei are presented. 相似文献
37.
A. M. Rodin A. V. Belozerov E. V. Chernysheva S. N. Dmitriev A. V. Gulyaev A. V. Gulyaeva M. G. Itkis J. Kliman N. A. Kondratiev L. Krupa A. S. Novoselov Yu. Ts. Oganessian A. V. Podshibyakin V. S. Salamatin I. Siváček S. V. Stepantsov D. V. Vanin V. Yu. Vedeneev S. A. Yukhimchuk C. Granja S. Pospisil 《Hyperfine Interactions》2014,227(1-3):209-221
The mass-separator MASHA built to identify Super Heavy Elements by their mass-to-charge ratios is described. The results of the off- and on-line measurements of its separation efficiency are presented. In the former case four calibrated leaks of noble gases were used. In the latter the efficiency was measured via 284 MeV $^{40}$ Ar beam and with using the hot catcher. The ECR ion source was used in both cases. The $\alpha $ -radioactive isotopes of mercury produced in the complete fusion reaction $^{40}$ Ar+ $^{144}$ Sm $\rightarrow ^{184-xn}$ Hg+xn were detected at the mass-separator focal plane. The half-lives and the separation efficiency for the short-lived mercury isotopes were measured. Potentialities of the MEDIPIX detector system have been demonstrated for future use at the mass-separator MASHA. 相似文献
38.
在20世纪60年代,William Myers与Wladyslaw,以及Victor Viola Jr 与Glenn Seaborg 两个研究组独立地预言:在核素图中所谓的稳定岛上存在着重核。图1表示现在所了解的核地貌。已经确定的幻数有:2,8,20,28,50 和126(只是中子幻数)。在核的中子或质子数等于幻数处,核壳层闭合,壳层之间有较大的能量间隙,核的稳定性增强。现代理论方法也指出,在幻数中子数N=184 附近存在着长寿命的核。理论预言下一个幻数原子序数Z在114 和126 之间。实际上,在N=184和Z=114到126附近,具有很高的中子与质子能级密度,尽管没有很大的能量间隙,核的稳定性仍会增强。目前的实验结果与存在着延伸的超重核岛的预言一致。某些模型预言新的超重核的半衰期可达几百万年,有的计算指出,这些核的寿命与地球年龄相当。 相似文献
39.
Yu. Ts. Oganessian Yu. A. Lazarev V. L. Mikheev Yu. A. Muzychka I. V. Shirokovsky S. P. Tretyakova V. K. Utyonkov 《Zeitschrift für Physik A Hadrons and Nuclei》1994,349(3-4):341-342
A search for the12C decay of114Ba produced in the58Ni(58Ni,2n) reaction was performed by using polycarbonate track detectors. Assuming the total half-life of114Ba to be 0.1 s, the lower limit T c ≥103 s for the partial12C-decay half-life was established. 相似文献
40.
T. Materna C. Schmitt Y. Aritomo J. Bartel B. Benoit A. A. Bogatchev E. de Goès Brennand O. Dorvaux G. Giardina F. Hanappe M. G. Itkis I. M. Itkis J. Kliman G. N. Kniajeva N. A. Kondratiev E. M. Kozulin L. Krupa Yu. Ts. Oganessian I. V. Pokrovsky E. V. Prokhorova N. Rowley K. Siwek-Wilczynska L. Stuttgé 《Physics of Atomic Nuclei》2003,66(6):1168-1172
Nuclear dissipation in capture reactions is investigated using backtracing, a new analysis protocol. Combining analysis procedure with dynamical models, the difficult and long-standing problem of competition and mixing between quasifission and fusion-fission is solved for the first time. The nature of the relevant dissipation is determined as one-body dissipation. At low excitation energy where shell effects are strongly effective, the shape of the mass distribution could be a powerful check of the nature and the magnitude of the dissipation. 相似文献