Excitation Functions for Nuclear Reactions between Complex Nuclei. I. Neutron Emission

1963 ◽  
Vol 130 (5) ◽  
pp. 1990-1995 ◽  
Author(s):  
G. R. Choppin ◽  
T. J. Klingen
Keyword(s):  
Nuclear Reactions ◽  
Neutron Emission ◽  
Excitation Functions ◽  
Complex Nuclei

Investigation of excitation functions of deuteron induced nuclear reactions on lead

2008 ◽  
Vol 276 (3) ◽  
pp. 835-841 ◽  
Author(s):  
F. Ditrói ◽  
F. Tárkányi ◽  
S. Takács ◽  
M. S. Uddin ◽  
M. Hagiwara ◽  
...  
Keyword(s):  
Nuclear Reactions ◽  
Excitation Functions

ABSOLUTE STANDARDIZATION OF RADIOACTIVE NEUTRON SOURCES: II. THE USE OF THE F19(α, n)Na22 REACTION

1959 ◽  
Vol 37 (5) ◽  
pp. 550-556 ◽  
Author(s):  
K. W. Geiger
Keyword(s):  
Nuclear Reactions ◽  
Emission Rate ◽  
Neutron Emission ◽  
National Research Council ◽  
Neutron Output ◽  
Neutron Sources ◽  
Neutron Thermalization ◽  
Γ Rays ◽  
Absolute Standardization ◽  
Good Agreement

Fluorine has only one stable isotope, F19. If neutrons are produced by the F19(α, n)Na22 reaction the neutron output can be calculated from the yield of the resulting radioactive Na22. The growth of Na22 (half-life, 2.58 years) has been measured in a neutron source consisting originally of 1.6 curies Po210 mixed with CaF2 powder. Since Na22 is a positron emitter, discrimination against γ-rays from Po210 and from nuclear reactions could be achieved by detecting the two positron annihilation quanta in coincidence. The Na22 growth has been followed over 20 months and is in agreement with the theoretical growth curve. Comparison with a calibrated Na22 source yielded a neutron emission rate of (10.70 ± 0.25) × 104 sec−1. This resulted in a neutron emission rate of (3.16 ± 0.10) × 106 sec−1 for the Ra-α-Be source of the National Research Council, in good agreement with (3.22 ± 0.05) × 106 sec−1 obtained by a neutron thermalization method.

Excitation functions of deuteron-induced nuclear reactions on natural platinum up to 24 MeV

2015 ◽  
Vol 362 ◽  
pp. 151-162 ◽  
Author(s):  
Mayeen Uddin Khandaker ◽  
Hiromitsu Haba ◽  
Masashi Murakami ◽  
Naohiko Otuka ◽  
Hasan Abu Kassim
Keyword(s):  
Nuclear Reactions ◽  
Excitation Functions

Excitation functions of proton induced nuclear reactions on 85Rb

1980 ◽  
Vol 31 (3) ◽  
pp. 141-151 ◽  
Author(s):  
Takayoshi Horiguchi ◽  
Hiroshi Noma ◽  
Yasukazu Yoshizawa ◽  
Hirokatsu Takemi ◽  
Hiromi Hasai ◽  
...  
Keyword(s):  
Nuclear Reactions ◽  
Excitation Functions

A study of pre-equilibrium emission in α-induced reactions on 121,123Sb

1991 ◽  
Vol 69 (11) ◽  
pp. 1376-1382 ◽  
Author(s):  
B. P. Singh ◽  
H. D. Bhardwaj ◽  
R. Prasad
Keyword(s):  
Compound Nucleus ◽  
Mass Number ◽  
Neutron Emission ◽  
Theoretical Calculations ◽  
Exciton Model ◽  
Excitation Functions ◽  
Stacked Foil Technique ◽  
Equilibrium Emission ◽  
Charged Particle Emission ◽  
Foil Technique

Excitation functions for the 121Sb (α, n)+ 123Sb(α, 3n),,21Sb(α, 2n)+ 123Sb(α, 4n), 121Sb(α, 4n), 121Sb(α, 3np), and 123Sb(α, n) reactions are measured in the energy range 30–60 MeV using the stacked foil technique. In the cases of the 121Sb(α, n)+ 123Sb(α, 3n) and 121Sb(α, 2n)+ 123Sb(α, 4n) reaction pairs, the excitation functions for individual reactions were deduced using theoretical calculations. Excitation functions are also calculated theoretically using the compound-nucleus model with and without the inclusion of a pre-equilibrium emission. As expected, inclusion of a pre-equilibrium contribution based on the exciton model along with compound-nucleus calculations using the Hauser–Feshbach formalism reproduces well the measured excitation functions. Analysis of the data indicates a preference for a first chance neutron emission over charged-particle emission, and interesting trends in the energy and mass-number dependence of the pre-equilibrium fraction are observed.

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