8,581,057 Hits in 5.5 sec

Two-particle photodisintegration of He-4: He-4(gamma,d)d, He-4(gamma,p)T, He-4(gamma,n)He-3 [article]

O. E. Koshchii, P. E. Kuznietsov, Yu. A. Kasatkin
2012 arXiv   pre-print
The only functional parameter was the vertex structure function, which described the "collapse" of a He-4 nucleus and the nucleon remnants.  ...  Using a covariant diagram technique and the concept of a nucleus as an elementary particle we calculated differential cross-sections for two-particle photodisintegration reactions of the He-4.  ...  Figure 1 : 1 4 He(γ, d)d process in the center-of-mass system.  ... 
arXiv:1212.5419v1 fatcat:tuxrmwbd3rdv3j26btrib6h2eu

Fusion Cross Section of $${\mathrm{T(d,n)}}^{4}{\mathrm{He}}$$ T ( d , n ) 4 He and $${}^{3}{\mathrm{He(d,p)}}^{4}{\mathrm{He}}$$ 3 He ( d , p ) 4 He Reactions by Four Parameters Formula

T. Koohrokhi, A. M. Izadpanah, S. K. Hosseini
2016 Journal of fusion energy  
The obtained results for the two most important light nuclei reactions, T(d,n)^4He, ^3He(d,p)^4He are compared with other theoretical formulas and experimental data.  ...  Table 2 Y p ( ) E d = N d (E d )Ω ∫ 0 x 0 dσ(E d (x)) dΩ ρ(x)dx (1) 其中 Nd(Ed)是能量为 Ed的氘离子数; Ω是探测器的固 体角; x0是氘离子束在材料中的最大射程; ρ(x)为在 x 处 3 He 的浓度; dσ(E d (x)) dΩ 是在深度 x 处氘能量为 Ed (x)时 3 He (d, p) 4 He 核反应的微分散射截面  ...  在高温和高氦浓度环境下, 图 1 探测角为 1 168°时不同能量氘的 3 He (d, p) 4 He 核反应微分散射截面 Fig.1 Differential cross-section of 3 He (d, p) 4 He nuclear reaction versus the deuteron energy with the detection angele of 168°0 图 3  ... 
doi:10.1007/s10894-016-0105-y fatcat:cwkdaefun5ffvanxue2j56jq5u

η-^4 He interaction from the d d →η ^4 He reaction near threshold [article]

Ju-Jun Xie, Wei-Hong Liang, Eulogio Oset
2018 arXiv   pre-print
experimental ^4 He density.  ...  We analyze the data on the total cross sections for the dd →η^4 He reaction close to threshold and look for possible η ^4 He bound states.  ...  The cross section then becomes σ = M 2 d M4 He 9πs |A| 2 |1 −ṼG| 2 | p η || p d |e −2β 2 | p η | 2 , (17) where we have used |V P | 2 = 2 9 |A| 2 | p d | 2 . (18) This allows us to perform a fit to the  ... 
arXiv:1805.12532v2 fatcat:5nszu5nayfchpcvjul2swr4a6i

Effects of D and He implantation depth on D retention in tungsten under simultaneous D–He ion irradiation

T J Finlay, J W Davis, K Sugiyama, V Kh Alimov, A A Haasz
2016 Physica Scripta  
The effects of addition of ~3% He + in simultaneous D-He irradiation at various D and He ion energies were studied for polycrystalline W at 300 and 500 K.  ...  Combinations of 250-750 eV/D + and 500-1000 eV/He + were used to vary the D and He ion range relative to each other.  ...  D-only and simultaneous (SIM) D-He irradiations with 2.00-3.78% He + were performed at 3.24-6.65×10 19 D/m 2 flux, ~5×10 23 D/m 2 fluence, 300 and 500 K ± 50 K, 250-750 eV/D + and 500-1000 eV/He + .  ... 
doi:10.1088/0031-8949/t167/1/014042 fatcat:kh4pqr6hd5bunekemaey7bb3eq

Carbon influx in He and D plasmas in DIII-D

N.H Brooks, G.L Jackson, W.P West, M.E Fenstermacher, R.C Isler, C.J Lasnier, A Ramsey, M.R Wade, D.G Whyte, R.D Wood
1999 Journal of Nuclear Materials  
Plasma 2.2 x 1018 1 . 9~ 1018 6.1 x 1018 6.7 x io15 1.2 x 1016 1.4 x 1016 8.5 x 1016 2.4 x 1017 He Plasma GENERAL ATOMICS REPORT GA-A22880 CARBON INFLUX IN HE AND D PLASMAS IN DIII-D  ...  Recycling emission from both D (Da at 656 nm) and He (He11 at 468 nm) is measured simultaneously along several identical chords in both the upper and lower divertor.  ... 
doi:10.1016/s0022-3115(98)00547-9 fatcat:svdctwivnzd4xjf22wwxucao7q


1990 Le Journal de Physique Colloques  
The d-d configuration in 4He is taken as a superposition of S and D states. The D-state component has been extensively studied by various authors 161.  ...  The expansion of the transition amplitude into terms with definite P gives w h e r e d d and d are the 2~ and 6~i spin projections.  ... 
doi:10.1051/jphyscol:1990648 fatcat:jmr2drhb7zhfxl4j3tt5kqorsq

Effect of He on D retention in W exposed to low-energy, high-fluence (D, He, Ar) mixture plasmas

M.J. Baldwin, R.P. Doerner, W.R. Wampler, D. Nishijima, T. Lynch, M. Miyamoto
2011 Nuclear Fusion  
PISCES • NRA D conc. profiles : D( 3 He,p)α, 2.5 MeV 3 He + (WR Wampler --SNL). • D restricted at surface (<50 nm) in mixed D 2 --He plasma, compared to pure D 2 . • He pretreat gives similar effect, but  ...  (D 2 -αHe) T s = 473 K, E ion = 50 eV (D 2 ) T s = 473 K, E ion = 50 eV, Φ D+ = 5-8 x10 26 m -2 Single step (D, He) exposure ---(He) T s = 473 K, E ion = ~30-50 eV Two step, He pretreat, D plasma exposure  ...  φ D(He) /φ D , is increasingly effecOve as Φ He passes ~10 24 m --2 , in both D 2 --He plasma, and pretreat He, D 2 plasma, cases. • Interconnected return pathways to PMI surface due to nanobubble growth  ... 
doi:10.1088/0029-5515/51/10/103021 fatcat:m42ijc54ofe4joukpvfszmlkxa

Improved 𝑫−𝑯𝒆 𝟑 Fusion Reaction Characteristics Parameters

Ali K. Taki, Raad H. Majeed, Mustafa K. Jassim
2017 Ibn AL- Haitham Journal For Pure and Applied Science  
The most likely fusion reaction to be practical is Deuterium and Helium-3 (𝐷𝐻𝑒 3 ), which is highly desirable because both Helium -3 and Deuterium are stable and the reaction produces a 14 𝑀𝑒𝑉 proton  ...  Theoretical models By definition, the reaction rate 𝑹 for reaction 𝒊 in a space independent problem is given by 𝑹 = 𝒏 𝑫 𝒏 𝑯𝒆 ∭ 𝒇(𝒗 � �⃗ 𝑫 )𝑭(𝒗 � �⃗ 𝑯𝒆 ) 𝒈 𝒅𝝈 𝒊 𝒅𝜴 𝒅𝜴𝒅𝒗 � �⃗ 𝑫  ...  In the Bernstein -Comisar formalism, one can introduce the dummy variable 𝐸 by use of a Dirac Delta distribution, so that 𝑹 = 𝒏 𝑫 𝒏 𝑯𝒆 ∭ 𝒇(𝒗 � �⃗ 𝑫 )𝑭(𝒗 � �⃗ 𝑯𝒆 ) 𝒈 𝒅𝝈 𝒊 𝒅𝜴 𝜹�𝑬 −  ... 
doaj:f03389e01de14851ba4ab93162f8cffd fatcat:opr2l2yhqfcfdm6cvy7qmmzy4m

High pressure line shapes of the Rb D 1 and D 2 lines for 4 He and 3 He collisions

Wooddy S. Miller, Christopher A. Rice, Gordon D. Hager, Mathew D. Rotondaro, Hamid Berriche, Glen P. Perram
2016 Journal of Quantitative Spectroscopy and Radiative Transfer  
The 3 He broadening rate for the D 2 line is 4% larger than the 4 He rate, and 14% higher for the D 1 line, reflecting the higher relative speed.  ...  Line shapes for the Rb D 1 (5 2 S 1=2 25 2 P 1=2 ) and D 2 (5 2 S 1=2 25 2 P 3=2 ) transitions with 4 He and 3 He collisions at pressures of 500-15,000 Torr and temperatures of 333-533 K have been experimentally  ...  Figs. 5 and 6 illustrate the observed line shapes for both the Rb D 2 and D 1 lines for 4 He and 3 He pressures of 500-15,000 Torr at 343 K.  ... 
doi:10.1016/j.jqsrt.2016.06.027 fatcat:nrujmbhhkng7hkskafvkjfmitm

ÉTUDE SUR LES RÉACTIONS 10B(d, α)24He ET 9Be(3He, α)24He

1966 Le Journal de Physique Colloques  
Nous avons étudié les réactions loB(d, cc) 24He et gBe(3He,a)24He par la détection  ...  D.) et WAGGONER (M. A.), Physics Letters, 1964, 12, no 1. 45. FIG. 1. -Spectres en énergie des particules u [3] BRONSON (J. D.), SIMPSON (W. D.), JACKSON (W.  ...  - Avec "~( d , a) 2 4He à 9 MeV, les niveaux d'excitation supérieure peuvent être observés.  ... 
doi:10.1051/jphyscol:1966149 fatcat:ygvl3crubbgy7nr6avqa5hjisq

An Approach to D-3He Fusion

1997 The Journal of the Institute of Electrical Engineers of Japan  
太 陽 内 のD(p,γ)3He反 応 に よ るヘ リウ ム3は 太 陽 風 の 一 部 と して 月面 に 到達 す る。 これ ら の 粒 子 は 月 面 の 岩 石 に 激 突 し て,岩 石 の 表 面 か ら 20-30nm程 度 の深 さに埋 め 込 まれ る。  ...  2.2ヘ リウ ム3の 人 工 資 源 これ まで に,ヘ リウ ム3を 人 工 的 に増 殖 す べく6Li(p, α)3He反 応 の 利 用 が 検 討 さ れ た(1)。  ... 
doi:10.1541/ieejjournal.117.30 fatcat:r5cexm3tfvdpjfo7p5fivkjadi


W. M. Mew
1899 Journal of the American Chemical Society  
must become a part of his very being, if he too wishes to do his share, however small, toward completing and rounding out the still unfinished structure?  ...  T h e answer is plain: "he can do this only by comprehending the spirit of the science, by learning its great theories, not as mere mnemonic efforts, THE MICROSCOPY OF DRINKING WATER.  ... 
doi:10.1021/ja02058a014 fatcat:n2p3vruzmjf7ji2ayq6epr6ii4

The3H(d,γ)5He Reaction forEc.m.≤ 300 keV

C.E. Parker, C.R. Brune, T.N. Massey, J.E. O'Donnell, A.L. Richard, D.B. Sayre, C. Elster, D.R. Phillips, C.D. Roberts
2016 EPJ Web of Conferences  
The 3 H(d, γ) 5 He reaction has been measured using a 500-keV pulsed deuteron beam incident on a stopping titanium tritide target at Ohio University's Edwards Accelerator Laboratory.  ...  A stilbene scintillator and an NE-213 scintillator have been used to detect the neutrons from the 3 H(d, n) 4 He reaction using both the pulse-shape discrimination and TOF techniques.  ...  However, about 1 in 10 4 times in a deuterium-tritium environment, the 3 H(d, γ) 5 He reaction can occur.  ... 
doi:10.1051/epjconf/201611303005 fatcat:7n7lrxqbkveohhudsivb24fasq

On the galactic evolution of D and He-3

Elisabeth Vangioni-Flam, Keith A. Olive, Nikos Prantzos
1994 Astrophysical Journal  
We consider various models for the chemical evolution of the Galaxy to test the feasibility for the destruction of D without the overproduction of ^3He and overall metallicity.  ...  The determined abundances of primordial ^4He and ^7Li provide a basis with which to test the standard model of big bang nucleosynthesis in conjunction with the other two light element isotopes D and ^3He  ...  In the IRA, an analogous expression to (13) was derived in Olive et al. (1990) (D + 3 He) (D + 3 He) p = D D p g 3 −1 (16) so that the model dependence of D/D p feeds into (D + 3 He).  ... 
doi:10.1086/174171 fatcat:krl4lvtytjhonewk6ifei6mneu

Investigation of the $$^3 He(\vec d ,p)^4 He$$ reaction between 1 and 13 MeV

M. Bittcher, W. Gr�ebler, V. K�nig, P. A. Schmelzbach, B. Vuaridel, J. Ulbricht
1990 Few-body systems  
High-precision measurements of the cross section, the vector analyzing power iTtl and the three tensor-analyzing powers T2o, T21 , and T22 of the 3He(d, p)*He reaction have been performed in the energy  ...  The Q-value of the 3He(d, p)4He reaction is + 18.35 MeV.  ...  The d-3He entrance channel leads to a highly excited SLi nucleus.  ... 
doi:10.1007/bf01091705 fatcat:7mpukxpz7jf7tbmptwvky6ayu4
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