排序方式: 共有5条查询结果,搜索用时 46 毫秒
1
1.
2.
Pushpendra P. Singh Manoj Kumar Sharma Unnati Devendra P. Singh Rakesh Kumar K. S. Golda B. P. Singh R. Prasad 《The European Physical Journal A - Hadrons and Nuclei》2007,34(1):29-39
With a view to study complete- and incomplete-fusion components in 159Tb , 169Tm ( 16O , x reactions, experiments have been carried out at the Inter-University Accelerator Center, New Delhi, India using the 15UD
Pelletron accelerator facilities. The forward mean recoil ranges for some radio-nuclides; 168m
Lu , 167Lu , 167Yb , 166Tm produced in the
16O$ + $159Tb
system at ≈ 90 MeV, and 179Re , 177Re , 177W , 178Ta and 177Hf produced in the
16O$ + $169Tm
system at ≈ 87 MeV have been measured. The recoil-catcher activation technique followed by off-line γ -spectrometry has been
employed in the present work. The analysis of forward mean ranges for different radio-nuclides has been done in the framework
of the degree of linear momentum transfer from projectile to target nucleus by adopting break-up fusion model considerations.
Different complete- and incomplete-fusion components, which may be attributed to the fusion of 16O and/or 12C and 8Be transfer from the 16O projectile to the target nucleus have been observed. An attempt has also been made to separate out the relative percentage
contributions of complete- and incomplete-fusion components using experimentally measured forward recoil ranges. The complete-fusion
contributions deduced from recoil range distribution are found to be consistent with the prediction of the theoretical model
code PACE. The analysis of data indicates the complete- and incomplete-fusion competition for both the systems at the given
energies. 相似文献
3.
Research on Chemical Intermediates - In this article, a mild and highly efficacious synthetic route has been developed for the synthesis of spiro[indoline-3,9′-xanthene]trione and... 相似文献
4.
El-Qisairi AK Qaseer HA Katsigras G Lorenzi P Trivedi U Tracz S Hartman A Miller JA Henry PM 《Organic letters》2003,5(4):439-441
[reaction: see text] The oxidation of olefins by chiral monometallic and bimetallic Pd(II)-Cu(II) catalysts in bromide-containing aqueous-THF reaction mixtures produced chiral 1,2-dibromides. With alpha-olefins, the ee's were about 95% while most of the internal alkenes gave somewhat lower enantioselectivities ( approximately 80%). 相似文献
5.
Manoj Kumar Sharma H. D. Bhardwaj Unnati Pushpendra P. Singh B. P. Singh R. Prasad 《The European Physical Journal A - Hadrons and Nuclei》2007,31(1):43-51
With a view to study the pre-equilibrium emission mechanism in α-induced reactions the excitation functions for 93Nb(α, n)96m
Tc, 93Nb(α, n)96Tc, 93Nb(α, 2n)95m
Tc, 93Nb(α, 2n)95g
Tc and 93Nb(α, 3n)94Tc reactions have been measured in the energy range threshold to ≈ 10MeV/nucleon using the activation technique. The measured
excitation functions have also been compared with theoretical predictions based on the semi-classical code, which takes into
account compound nucleus as well as pre-equilibrium emission. The analysis of the data indicates significant contribution
from pre-equilibrium emission at these energies particularly in the high-energy tail portion of EFs. The effect of the variation
of the parameters used in the code has been studied. The isomeric cross-section ratios have also been measured. It has been
observed that the pre-equilibrium fraction increases rapidly with the increase in α-particle bombarding energy. 相似文献
1