NEUTRONS AND GAMMA RAYS FROM Po210–B10(α,n) AND Po210–B11(α,n) SOURCES

1962 ◽  
Vol 40 (1) ◽  
pp. 33-48 ◽  
Author(s):  
K. W. Geiger ◽  
C. J. D. Jarvis

The neutron energy spectra from Po–B10(α,n) and Po–B11(α,n) sources have been determined by the nuclear emulsion method and with a proton recoil spectrometer. Gamma spectra have also been measured. The Po–B10 neutron spectrum extends to an energy of 6.0 Mev and shows two peaks, at 1.0 and 3.0 Mev. The lines in the gamma spectrum are not in coincidence with neutrons but are caused by competing reactions. The Po–B11 neutron spectrum shows one peak at 2.7 Mev; the maximum energy observed is 5.0 Mev. One γ-ray line at 2.32 Mev with an intensity of 5% of the neutron emission rate is detected in the gamma–neutron coincidence measurements. The experimental neutron energy spectra have been compared with calculated spectra and are compatible with the gamma measurements, as well as with published level schemes for the residual N13 and N14 nuclei. In the case of the Po–B10 source only one-third of the neutrons are produced by the B10(α,n)N13 reaction and the remainder has to be accounted for by the B10(α,np)C12 reaction.

2016 ◽  
Vol 19 (4) ◽  
pp. 131-136
Author(s):  
Thu Thi Ai Nguyen

For the design of ADS (Accelerator Driven System), it is important to study neutron spectra and details of nuclear reactions induced by neutrons. Furthermore, neutron energy and angular distribution data are important for a correct simulation of the propagation of particles inside a spallation target and the geometrical distribution of the outgoing neutron flux. Many experimental results are available for thin targets and massive targets additional studies of neutron spectra and neutron production were investigated to design target for ADS with incident proton energies up to 3 GeV. In our study, the angular distribution and the neutron energy spectra are reported for the (p,n) reaction on target nuclei such as Pb, U, W with energy from 50 MeV to 350 MeV calculated with database of JENDL-HE 2007. We obtain a set of data about the angular distribution and energy spectra of produced neutrons on some heavy targets with energy ranges as stated above. From the results of neutron spectra, the paper also gives many comments to recommend a choice of materials for target and energies for accelerating proton beam . From the angle distribution of neutrons generated in (p, n) reactions on the different targets with the different energies of proton, the solutions to arrange the reflection bars in reactor proposed. A comparison is also made to improve the reliability for calculation of the paper.


1976 ◽  
Vol 28 (2) ◽  
pp. 270-281 ◽  
Author(s):  
P. K. Sarkar ◽  
K. N. Kirthi ◽  
A. K. Ganguly

1995 ◽  
Vol 37 (10) ◽  
pp. 1187-1196 ◽  
Author(s):  
B Wolle ◽  
U Gerstel ◽  
K Hubner ◽  
L -G Eriksson ◽  
G Sadler ◽  
...  

1970 ◽  
Vol 9 (4) ◽  
pp. 454-507 ◽  
Author(s):  
D. Okrent ◽  
W. B. Loewenstein ◽  
A. D. Rossin ◽  
A. B. Smith ◽  
B. A. Zolotar ◽  
...  

2001 ◽  
Vol 72 (1) ◽  
pp. 759-766 ◽  
Author(s):  
Göran Ericsson ◽  
L. Ballabio ◽  
S. Conroy ◽  
J. Frenje ◽  
H. Henriksson ◽  
...  

Author(s):  
Noriaki Nakao ◽  
Shingo Taniguchi ◽  
Sayed H. Rokni ◽  
Stefan Roesler ◽  
Markus Brugger ◽  
...  

2008 ◽  
Vol 35 (7) ◽  
pp. 1296-1300 ◽  
Author(s):  
Sylena E. Smith ◽  
Xiaodong Sun ◽  
C. Alan Ford ◽  
Audeen W. Fentiman

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