搜索结果: 151-165 共查到“重离子核物理学”相关记录575条 . 查询时间(2.406 秒)
9-cell TESLA超导加速腔研制中Dumb-Bells的测量与调整
超导腔 Dumb-Bells 调整
2009/8/17
为了保证9-cell超导加速腔在场的平滑度、TM010模的频率以及加速器的总长度达到TESLA国际标准, 必须确保每个Dumb-Bell在以上各方面达到标准要求. 由于冲压、机加工以及电子束焊接等过程会引起形变, 因此, 必须在完成iris和加强筋的电子束焊接之后对Dumb-Bells进行微波和机械测量, 并根据测量的结果对其腔形和长度等作必要的调整. 北京大学已经建立了一套完整的测量和调整Dum...
Experimental verification of therapeutic doses for the superficially-placed tumor radiotherapy with heavy ions at HIRFL
heavy-ion radiotherapy carbon ions therapeutic dose verification irradiation system dose optimization
2009/8/17
Up to now, clinical trials of heavy-ion radiotherapy for superficially placed tumors have been carried out for six times and over 60 selected patients have been treated with 80—100 MeV/u carbon ions s...
Emissions of fragments and mesons produced in heavy-ion collisions at CSR and related energies
CSR and related energies heavy-ion collisions fragment meson multisource ideal gas model
2009/8/17
Using a multisource ideal gas (MSIG) model, we reconstruct the transverse emission source in the momentum space for light fragments produced in reactions 86Kr-124Sn at 25 MeV/nucleon and b=7—10 fm bas...
Effects of multi-collisions and surface on elliptic flow
relativistic heavy-ion collisions elliptic flow surface emitting many collisions
2009/8/14
The non-central Au+Au collision at center-of-mass energy √sNN=200 GeV is simulated using AMPT model. It is found that both the integral and differential elliptic flow behaves differently for partons f...
Jet-photon conversion with energy loss in heavy ion collisions
relativistic heavy ion collisions quark gluon matter jet-photon conversion energy loss
2009/8/14
The rate of high energy photons produced from energetic jets during their propagation through the QGP at RHIC and LHC is studied by taking into account the contribution of jet quenching in the medium....
Design of magnet and control of the beam emittance for Penning H－ ion source
H－ ion source Magnetron ion source Penning ion source magnetic field gradient index
2009/8/14
The design requirement and principle of the deflection magnet for Magnetron and Penning H－ ion source are discussed. It is proved that there exists a maximum emittance for the beam that may be transf...
Double folding model calculation applied to fusion reactions
heavy-ion fusion reaction double folding model deformation barrier distribution
2009/8/14
The interaction potential between a spherical and a deformed nucleus is calculated within the double-folding model for deformed nuclei. We solve the double folding potential numerically by using the t...
Investigation of PL properties of C-doped SiO2/Si samples after high energy Pb ion irradiation
heavy ion irradiation, carbon ion implantation, photoluminescence (PL) spectra
2009/8/14
Amorphous SiO2 thin films with about 400—500 nm in thickness were thermally grown on single crystalline silicon. These SiO2/Si samples were firstly implanted at room temperature (RT) with 100 keV carb...
Progresses of heavy-ion cancer therapy
heavy-ion cancer therapy inversed dose profile relative biological effectiveness
2009/8/14
The status of heavy-ion cancer therapy has been reviewed. The existing and constructing heavy-ion beam facilities for cancer therapy in the world are introduced. The first clinical trials of superfic...
Production cross-section of 230Ra in the reaction of 60 MeV/u 18O ions with 238U
18O ion 230Ra nature uranium target multinucleon transfer reaction cross section
2009/8/14
A thick natural uranium target was bombarded with a 60 MeV/u 18O beam. The neutron-rich isotope 230Ra as the target residue was produced through the multinucleon transfer reaction(238U-4p-4n). The bar...
RQMD predition of directed flow at CSR energy
directed flow azimuthal correlation heavy-ion collision
2009/8/14
The predictions of the directed collective flow by using the relativistic quantum molecular dynamics model are presented for the heavy-ion reactions at HIRFL-CSR energies. The directive flow value as...
Rotating wheel filter design and optimization for a uniform depth dose distribution in heavy ion therapy
heavy ion spread-out Bragg peak rotating wheel filter Monte Carlo method
2009/8/14
Treatment planning of heavy-ion radiotherapy involves predictive calculation of not only the physical dose but also the biological dose in a patient body. The goal in designing beam-modulating device...
14MeV中子的(n, 2n)反应截面系统学研究
(n, 2n)反应截面 14MeV中子
2009/8/13
对1984年以前的A=19—209的124种核素的14MeV(n, 2n)反应截面的实验数据进行了收集、分析和评价. 研究了截面与(N—Z)/A的关系. 看不出有明显的中子壳效应存在. 用复合核统计理论对一些核的反应截面进行了计算, 对中重核和重核的计算结果与实验值符合较好.
12C+124Sn系统中大质量转移反应的初始L分布
初始L分布 大质量转移反应 12C+124Sn系统
2009/8/13
用α-γ符合测量方法, 对72MeV的12C离子轰击近球形靶124Sn的(12C,α×n)和(12C,8Be×n)反应进行了研究. 测定了与前方角20°—50°发射的α粒子相关联的余核级联γ的平均γ多重性, 据此推算出124Sn核俘获8Be和α反应的最可几初始轨道角动量分别是35.5(h)和39(h), 与全熔合临界角动量lcr=34.4(h)之比近似等于1, 甚至稍大于1. 实验支持了大...