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Effects of the entrance channel mass asymmetry in fusion reactions

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Chinese Physics C 2010年第10期34卷 1602-1608页

作者：卞宝安张丰收 School of Science Jiangnan University The Key Laboratory of Beam Technology and Material Modification of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal University Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of Lanzhou

The symmetric and asymmetric fusion reaction systems forming the same compound nuclei ^26Al, ^30Si, ^38Ar and ^170Hf are investigated with the frame of improved isospin dependent quantum molecular dynamics model. The entrance channel mass asymmetry dependence of compound nucleus formation is found by analyzing the shell correction energies, the Coulomb barriers and the fusion cross sections. The calculated fusion cross sections agree quantitatively with the experimental data. The results indicate that compound nucleus formation is favorable for the systems with larger mass asymmetry because of the smaller Coulomb contribution to the fusion barrier.

关键词： fusion reactions mass asymmetry Coulomb barrier

Reaction dynamics of proton-rich nuclei at energies around the Coulomb barrier:the cases of^(7)Be,^(8)B,and^(17)F

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Nuclear Science and Techniques 2024年第12期35卷 239-254页

作者： Tian‑Peng Luo Lei Yang Cheng‑Jian Lin Nan‑Ru Ma Pei‑Wei Wen Hui‑Ming Jia Feng Yang China Institute of Atomic Energy Beijing 102413China

The exploration of reaction dynamics,particularly the breakup and fusion mechanisms of proton drip-line nuclei at energies around the Coulomb barrier,is crucial in the feld of nuclear *** study reviews experimental investigations on the reactions induced by proton-rich nuclei,^(7)Be,^(8)B,and^(17)F,including elastic scattering and direct and fusion reactions at the near-barrier *** particular,we briefy introduce complete kinematic measurements of^(8)B+^(120)Sn and^(17)F+^(58)Ni at the energies of *** reaction dynamics are observed for proton-rich nuclei compared with neutron-rich nuclei.

关键词： Proton-rich nuclei Energies around the Coulomb barrier Elastic scattering Breakup reactions fusion reactions

Region-based fusion of infrared and visible images using nonsubsampled contourlet transform

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Chinese Optics Letters 2008年第5期6卷 338-341页

作者：郭宝龙张强侯叶 ICIE Institute School of Electromechanical EngineeringXidian University

With the nonsubsampled contourlet transform （NSCT）, a novel region-segmentation-based fusion algorithm for infrared （IR） and visible images is presented. The IR image is segmented according to the physical features of the target. The source images are decomposed by the NSCT, and then, different fusion rules for the target regions and the background regions are employed to merge the NSCT coefficients respectively. Finally, the fused image is obtained by applying the inverse NSCT. Experimental results show that the proposed algorithm outperforms the pixel-based methods, including the traditional wavelet-based method and NSCT-based method.

关键词： Boolean functions fusion reactions Image enhancement Image fusion Image segmentation Nuclear physics

fusion Reactivity in the Case of Ion Cyclotron Resonant Heating

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Chinese Physics Letters 2003年第11期20卷 1981-1983页

作者：俞国扬常永斌沈林芳 InstituteofPlasmaPhysics ChineseAcademyofSciencesHefei230031 Presentaddress:UniversityofNorthTexas DentonTX76203USA Presentaddress:ZhejiangUniversity Hangzhou310027

By applying the integral-variable-change technique, an explicit expression of deuterium–tritium fusion reactivity in the case of second harmonic ion cyclotron resonant heating on deuterium is obtained.

关键词： fusion reactivity Cyclotrons fusion reactions fusion (melting) Heating second harmonics Ions

Investigating the impact of the universal function of the nuclear proximity potential in heavy-ion fusion cross sections

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Communications in Theoretical Physics 2024年第5期76卷 86-93页

作者： R Gharaei E Sarvari Department of Physics Sciences FacultyHakim Sabzevari UniversityPO Box 397SabzevarIran Department of Physics Faculty of ScienceFerdowsi University of MashhadPO Box 91775-1436MashhadIran Science Faculty Department of PhysicsTarbiat Modares UniversityTehranIran

The fusion barriers and cross sections of 15 colliding systems with 320≤Z_(1)Z_(2)≤1512 are investigated in detail to understand the influence of the universal function of proximity potential formalism in the heavy-ion fusion *** realize this goal,we select three versions of the phenomenological proximity potentials,including Prox.77,Zhang 2013,and Guo 2013,to calculate the nucleus-nucleus *** experimental fusion cross sections for the selected reactions are analyzed using the standard coupled-channel calculations,including couplings to the low-lying 2^(+)and 3^(-)states in the target and *** calculated results show that the universal functions of the Guo 2013 and Prox.77 models provide the lowest and highest fusion barriers,*** addition,it is found that the height of the fusion barriers is enhanced by increasing the mass number of the projectile from light to heavy *** highest sensitivity to the mass number of the projectile belongs to the results of Prox.77.A discussion is also presented on the influence of the universal function on the radial behavior of the interaction potential in the allowed region for overlapping *** results reveal that the best fit to the experimental data of the fusion cross sections for the reactions involving light and medium nuclei is obtained using the universal function of the Zhang 2013 *** the heavier systems,the results of the Guo 2013 model at sub-barrier energies provide a good description of the available data.

关键词： fusion reactions proximity-type potentials universal function coupled-channel calculations

Integration of GaN thin films with silicon substrates by fusion bonding and laser lift-off

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Chinese Optics Letters 2006年第7期4卷 416-418页

作者：王婷郭霞方圆刘斌沈光地 Optoelectronic Technology Laboratory Institute of Electronic Information & Control Engineering Beijing University of Technology

GaN thin films grown on sapphire substrates by metalorganic chemical vapor deposition （MOCVD） are successfully bonded and transferred onto Si receptor substrates using fusion bonding and laser lift-off （LLO） technique. GaN/Al2O3 structures are joined to Si substrates by pressure bonding Ti/Au coated GaN surface onto Ti/Au coated Si receptor substrates at the temperature of 400℃. KrF excimer laser with 400-mJ/cm^2 energy density, 248-nm wavelength, and 30-ns pulse width is used to irradiate the wafer through the transparent sapphire substrates and separate GaN films from sapphire. Cross-section scanning electron microscopy （SEM） combined with energy dispersive X-ray spectrometer （EDS） measurements show that Au/Si solid solution is formed during bonding process. Atomic force microscopy （AFM） and photoluminescence （PL） measurements show that the qualities of GaN films on Si substrates degrade little after substrates transfer.

关键词： Atomic force microscopy Bonding Energy dispersive spectroscopy Excimer lasers fusion reactions Gallium nitride Metallorganic chemical vapor deposition Photoluminescence Sapphire Scanning electron microscopy Silicon Solid solutions Substrates Surfaces X ray spectrometers