The 11B(p,α)8Be?→?α?+?α and the 11B(α,α)11B Reactions at Energies Below 5.4?MeV

Measurements of the absolute cross section and angular distributions for the $^{11} \hbox{B}(p,\alpha)^{8}{\text{Be}}\rightarrow\alpha+\alpha$ and the ¹¹B(α,α)¹¹B reactions have been performed from 0.15 to 3.8?MeV for the ¹¹B(p,α) study and from 2 to 5.4?MeV for the ¹¹B(α,α) reaction. The absolute cross sections are presented in terms of the total number of α-particles detected in order to avoid uncertainties due to ambiguities in the number of alpha particles emitted in the reaction at a particular energy. The angular distributions of the ¹¹B(p,α)⁸Be(2⁺) reaction were fit to a Legendre polynomial expansion and the coefficients are presented. Finally, the ¹¹B(α,α)¹¹B data were fit in terms of phase shifts (ignoring the spin of the target), providing a convenient representation of the elastic cross section data between 2 and 5.4?MeV.     

The Evaluation and Calculation of Production Cross Sections for ~(11)C, ~(13)N and ~(15)O from ~(11)B, ~(13)C, ~(15)N(p,n) and ~(16)O(p,x)~(13)N Reactions up to 80 MeV

Introduction The medical radioisotopes are used for diagnostic and therapeutic purposes, as well as metabolism and physiological function researches in modern medicine. If a short-lived radioisotope emits a predominant or single γ-rays of 60～300 keV, it is of greater advantage since single photon emission computed tomograph(SPECT) can be performed; similarly β~ emitters are also of great significance since three dimensional high resolution scans can be obtained via     

BORON PROFILING IN SILICON BY ~(11)B(p,α)~8Be REACTION AT E_p=2.4MeV

The reaction 11B(p,α) 8Be was used to profile boron concentration in silicide. The energy of incident proton of 2.4 MeV was selected. The samples were Ti silicide implanted with 80 keV and 230 keV BF2. The experimental results indicate that the behaviour of boron is different from that of fluorine during silicide formation.     

Nuclear Spin-Polarized Proton and 11B Fuel for Fusion Reactors: Advantages of Double Polarization in the 11 B(p, α)8 Be * Fusion Reaction

A previously developed general formalism has been used to calculate the yield and the angular distributions of outgoing particles for fusion reactions when the projectile and target nuclei are both polarized. The case of D–³He is compared with earlier calculations and experiments and a new study for the case of fully polarized protons and ¹¹B in the ¹¹ B(p, α)⁸ Be ^* reaction is presented. The conditions which produce a gain in the yield and the angular distributions which affect the production of fusion energy are presented.     

The Systematics Research on (p, n) and (p,2n) Reaction Excitation Functions

On the basis of Planck formula of black body radiation and experimental excitation functions of (p,n) and (p,2n) reactions, an empirical systematics formula with two parameters is presented, which can describe experimental data of (p,n) and (p,2n) reactions well for incident proton energies from threshold to 150 MeV, target masses from 30 to 243.     

Cross Section Measurements for ~(199)Hg(n,p)~(199)Au,~(198)Hg(n,p)~(198)Au,~(196)Hg(n,p)~(196)Au and ~(196)Hg(n,d np pn)~(195)Au Reactions

Introduction The importance of nuclear data for fusion power reactor design has been acknowledged, in particular for safety, environment reasons and economics. The 14 MeV neutron activation cross sections are the key nuclear data for environmental impact, material recycling, waste handling. Due to the large     

Evaluation of Activation Cross Sections for (n,p) and (n,n′p) Reactions on ~(63,65,Nat)Cu

Introduction Copper is a very important structure material in nuclear fusion engineering. The neutron activation cross section are very useful in fusion research and other applications such as radiation safety, environmental, material damage and neutron dosimetry. More efforts are required to identify and resolve the differences and     

用光学模型和豪泽-费许巴赫理论计算中子与~(10)B,~(11)B的反应截面

本文用光学模型和豪泽-费许巴赫理论对中子与~(10) B、~(11)B的反应截面作了计算。得到了9.72MeV中子对~(10)B和9.97,12.06,14.10,18.12MeV中子对~(11)B反应的总截面、弹性散射截面与角分布、低激发态的非弹性散射截面与角分布、(n,p)、(n,d)、(n,t)和(n,α)反应的截面与角分布,以及~(11) B(n,α_0)~8Li_(基态)与~(11)B(n,α_1)~8Li_(第一激发态)的分支比。引出了α粒子与短寿命的~8Li核的光学势参数。计算结果与观测值作了比较。     

The total cross sections of the ~(11)B(α,n)~(14N) and the ~(10)B(α,n)~(13)N reactions between 2 and 6 MeV

There is considerable interest in potential aneutronic fusion reactors. One possible reaction is~(11)B(p,a)2a.However, the emitted alpha particles are energetic enough to generate neutrons by interacting with boron inside the reactor through the ~(11)B(α,n)~(14N) and ~(10)B(α,n)~(13)N reactions.To aid in evaluating neutron production within this potential aneutronic reactor, the total cross sections were measured for the ~(11)B(α,n)~(14N) reaction between 2 and 6 MeV and for the ~(10)B(α,n)~(13)N reaction between 2 and 4.8 MeV. The results are presented and compared with previously reported results.     

KORP-1——用DWBA方法计算直接(n,p)或(p,n)反应的程序(英文)

KORP-1是用于计算直接(n,p)或(p,n)反应的微分截面及其勒让德系数和积分截面的程序。将(n,p)或(p,n)反应的直接过程看成是一种敲出反应并用通常的在零程近似下的DWBA理论进行计算。一般来说所得的角分布计算结果是与实验数据符合的。     

用光学模型和豪泽-费许巴赫理论计算中子与~(10)B,~(11)B的反应截面

本文用光学模型和豪泽—费许巴赫理论对中子与~(10)B、~(11)B的反应截面作了计算。得到了9.72MeV中子对~(10)B和9.97,12.06,14.10,18.12 MeV中子对~(11)B反应的总截面、弹性散射截面与角分布、低激发态的非弹性散射截面与角分布、(n,p)、(n,d)、(n,t)与(n,a)反应的截面与角分布,以及~(11)B(n,a_0)Li基态与~(11)B(n,a_1)~3Li第一激发态的分支比。引出了a粒子与短寿命的~3Li核的光学势参数。计算结果与观测值作了比较。     

用光学模型和豪泽-费许巴赫理论计算中子与~(10)B,~(11)B的反应截面

本文用光学模型和豪泽-费许巴赫理论对中子与~(10)B、~(11)B的反应截面作了计算。得到了9.72MeV中子对~(10)B和9.97,12.06,14.10,18.12MeV中子对~(11)B反应的总截面、弹性散射截面与角分布、低激发态的非弹性散射截面与角分布、(n,p)、(n,d)、(n,t)和(n,α)反应的截面与角分布,以及~(11)B(n,α_0)~8Li基态与~(11)B(n,α_1)~8Li第一激发态的分支比。引出了α粒子与短寿命的~8Li核的光学势参数。计算结果与观测值作了比较。     

~(18)F(p,α)~(15)O,~(18)F(p.γ)~(19)Ne的核天体反应几率

氢在恒星的爆炸中燃烧。在这些环境中,温度范围为107～109K或更高,密度范围为102K～106g/cm3。在这些地方,核反应可以很快的发生,以致放射性核素诸如14O、15O、17F、18F等,在有机会衰变之前就俘获了质子。有关在这些环境中放射性核素的质子诱发反应,对于确定核素的合成以及能量的产生扮演着重要的角色。 特别是,当爆炸后,预测新星包层这些放射性核素的总量存在着很大的偏差,因为现在的18F（p,α）15O和18F（p,γ）19Ne反应在恒星中的反应率存在着很大的不确定性（达到约     

THE RE-EVALUATION OF NEUTRON DATA FOR ~(11)B

The ~(10)B was evaluated in CENDL-1,since 1982 some new experimentaldata have been published.All of them are considered in this evaluation,espec-ially,the(n,n'γ)cross sections.Some recommended data based experimental da-ta were improved,such as the total cross sections.They were obtained fromspline function fitting in the last evaluation,some structure were lost.     

Freeman离子源~(11)B离子比的提高

为了提高电子温度,对Freeman源电子反射屏与弧放电室的结构作了改进,使~(11)B离子比达到40%左右。     

INFLUENCE OF NUCLEAR RESONANCE ~(56)Fe(p,p)~(56)Fe ON K-SHELL IONIZATION PROBABILITY

The K-shell ionization probability Pk was measured as a function of Ep across the strong resonance 56Fe(p,p)56Fe at 2.522 MeV and about 50 % variation was observed. For a large ratio of the K-shell binding energy to the total width of the nuclear resonance, Uk/Г≥5, the present experimental result is still in good agreement with theoretical calculation based on Blair and Anholt's formula.     

Expressions for the ~(18)F(p,α) ~(15)O and ~(18)F(p,γ) ~(19)Ne Astrophysical Reaction Rates

Hydrogen is burned explosively in stellar explosions such as novae, X-ray bursts, X-ray pulsars, and supemovae, as well as possibly in other exotic astrophysical environments such as accretion disks around black holes, Thorne-Zytkow objects, and supermassive stars. Temperatures in these environments range from 107 to 109 K and above, and densities from 102 to 106g/cm3. In such sites,