EVIDENCE FOR LOW-MOMENTUM-TRANSFER PROCESS IN K41 (α,n)Sc44m,g REACTIONS FROM RANGE MEASUREMENTS OF PRODUCTS

1961 ◽  
Vol 39 (3) ◽  
pp. 697-705 ◽  
Author(s):  
Taku Matsuo ◽  
T. T. Sugihara
Keyword(s):  
Momentum Transfer ◽  
Compound Nucleus ◽  
Transfer Process ◽  
Ground State ◽  
Energy Region ◽  
Thick Target ◽  
Alpha Particles ◽  
Direct Reaction ◽  
Range Distribution ◽  
Lower Limits

Average forward ranges have been measured for the product nuclides Sc43, Sc44m, and Sc44g as produced in the reactions K41(α,xn) with alpha particles in the energy region 23 to 39 Mev. These ranges, which are determined by a thick target – thick catcher technique, indicate that the (α,n)-produced isomers are formed in part by a low-momentum-transfer process above 30 Mev, its contribution being larger for the ground-state nuclide Sc44g. From a thick target –thin catcher experiment at 40 Mev, it is found that the range distribution for Sc43 is that expected for a compound-nucleus reaction. Normalizing the Sc44m and Sc44g activity distributions to that of Sc43 for the catchers farthest from the target, we estimate the lower limits for the contribution of a direct-reaction low-momentum-transfer process to the formation of Sc44m and Sc44g at 40 Mev to be about 30% and 46% respectively.

THE ANGULAR DISTRIBUTION AND YIELD OF THE REACTION F19(p, α0)O16

1957 ◽  
Vol 35 (2) ◽  
pp. 155-167 ◽  
Author(s):  
R. L. Clarke ◽  
E. B. Paul
Keyword(s):  
Angular Distribution ◽  
Least Squares ◽  
Cross Sections ◽  
Legendre Polynomial ◽  
Ground State ◽  
Energy Region ◽  
Alpha Particles ◽  
Angular Distributions ◽  
Method Of Least Squares ◽  
Channel Spin

The yield of the ground state alpha particles from the F19(p, α0)O16 reaction has been studied from an energy of 1.3 Mev. to 2.7 Mev. The observed angular distributions were analyzed in terms of a Legendre polynomial expansion by the method of least squares. Six resonances were found in the energy region studied, at bombarding energies of 1.358 Mev., 1.709 Mev., 1.853 Mev., 2.11 Mev., 2.31 Mev., and 2.58 Mev. The widths and peak cross sections of these resonances are respectively: (54 ± 10 kev., 46 ± 5 mb.), (140 ± 5 kev., 55 ± 6 mb.), (132 ± 5 kev., 77 ± 8 mb.), (75 ± 25 kev., 10 ± 2 mb.), (80 ± 25 kev., 32 ± 5 mb.), and (300 ± 25 kev., 51 ± 10 mb.). Their spins, parities, channel spin mixtures, and partial widths are discussed.

Recoil studies of the reaction 12C(p,pn)11C from threshold to 85 MeV

1968 ◽  
Vol 46 (2) ◽  
pp. 267-277 ◽  
Author(s):  
S. Hontzeas
Keyword(s):  
Momentum Transfer ◽  
Compound Nucleus ◽  
Energy Region ◽  
Transfer Mechanism ◽  
Large Momentum Transfer ◽  
Vector Model ◽  
Angular Distributions ◽  
Large Momentum ◽  
Beam Direction ◽  
Evaporation Mechanism

In order to survey the features of the simple 12C(p,pn)11C reaction from threshold to 85 MeV, data were obtained for average projected ranges of 11C along and perpendicular to the beam direction. The data from threshold to 45 MeV provide evidence for a large momentum transfer mechanism of the compound nucleus type. In the 45–85 MeV energy region the data were analyzed in terms of a vector model consistent with the cascade–evaporation mechanism. More detailed information regarding differential ranges and angular distributions are needed if the recoil parameters are to provide conclusive results.

EPR Study on the complex formed by charge-transfer process between ground-state acceptor chloranil and nine donors

2010 ◽  
Vol 16 (5) ◽  
pp. 397-403
Author(s):  
Shi Ji-Liang ◽  
Zhou Cheng-Ming ◽  
Yi Hu-Nan ◽  
Qiu Zhi-Hai ◽  
Fu Yao-Hong ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Transfer Process ◽  
Ground State ◽  
Charge Transfer Process

scholarly journals Alpha?Particles from the Reaction 7Li(p,g)8Be(a)4He

1960 ◽  
Vol 13 (2) ◽  
pp. 116 ◽  
Author(s):  
DS Gemmell
Keyword(s):  
Ground State ◽  
Alpha Particles ◽  
Particle Spectrum ◽  
Dispersion Formula

The OI:-particle spectrum from the reaction 7Li(p,y)8Be*(0I:)4He has been determined in coincidence with y-rays_ The results indicate that, apart from the broad 2� 9 MeV level, there are no additional levels between the ground state and 7 MeV with intensities greater than 3 per cent. of the 2 . 9 MeV level. It is shown that the shape of the 2 -9 MeV level can be fitted satisfactorily by a dispersion formula if a large value for the reduced width of the level is assumed.

Direct-reaction effects in compound-nucleus and multistep compound reactions

1989 ◽  
Vol 193 (1) ◽  
pp. 195-205 ◽  
Author(s):  
H Nishioka ◽  
H.A Weidenmüller ◽  
S Yoshida
Keyword(s):  
Compound Nucleus ◽  
Direct Reaction

Thick target total bremsstrahlung spectra of lead compounds in the photon energy region 1–10 keV by 90Sr beta particles

2017 ◽  
Vol 130 ◽  
pp. 1-6
Author(s):  
Suhansar Jit Sharma ◽  
Tajinder Singh ◽  
Doordarshi Singh ◽  
Amrit Singh ◽  
A.S. Dhaliwal
Keyword(s):  
Photon Energy ◽  
Energy Region ◽  
Thick Target ◽  
Beta Particles ◽  
Lead Compounds

Tunable spectra and charge transfer process of benzodifurandione-based polymer by sulfur substitution

RSC Advances ◽  
2015 ◽  
Vol 5 (24) ◽  
pp. 18492-18500 ◽  
Author(s):  
Chaofan Sun ◽  
Dawei Qi ◽  
Yuanzuo Li ◽  
LinPo Yang
Keyword(s):  
Density Functional Theory ◽  
Charge Transfer ◽  
Charge Transport ◽  
Transport Properties ◽  
Transfer Process ◽  
Ground State ◽  
Density Functional ◽  
Charge Transfer Process ◽  
Functional Theory ◽  
Ground State Geometry

The ground state geometry, optical and charge transport properties of benzodifurandione-based PPV (BDPPV) have been studied with density functional theory methods.

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