Delayed Neutrons from High Energy Fission-Spallation Reactions

2005 ◽  
Author(s):  
D. Ridikas
Keyword(s):  
High Energy ◽  
Delayed Neutrons ◽  
Spallation Reactions

scholarly journals New Beryllium results in halo stars from Keck/HIRES spectra

2009 ◽  
Vol 5 (S268) ◽  
pp. 231-236
Author(s):  
Ann Merchant Boesgaard ◽  
Jeffrey A. Rich ◽  
Emily M. Levesque ◽  
Brendan P. Bowler
Keyword(s):  
Galactic Halo ◽  
Massive Stars ◽  
High Energy ◽  
High Signal ◽  
Signal To Noise ◽  
Interstellar Gas ◽  
Halo Stars ◽  
Spallation Reactions ◽  
Blue Straggler ◽  
The Galaxy

AbstractWe have obtained high-resolution, high signal-to-noise Keck spectra to determine Be abundances in over 100 stars in the Galactic halo. The stellar metallicities range from [Fe/H] = −0.50 to −3.50. Using this large sample, we have examined the trends of Be with Fe and Be with O. We find a real dispersion in Be at a given [O/H] that indicates that Be may not be a good cosmochronometer. Our results indicate that the dominant production mechanism for Be changes as the Galaxy ages. In the early eras of the Galaxy, when massive stars become supernovae, Be is produced from the acceleration of energetic CNO atoms which bombard protons in the vicinity of supernovae. Later spallation reactions occur as high energy protons bombard CNO atoms in the interstellar gas. The change occurs near [Fe/H] = −2.2. We have found that Be is deficient in Li-deficient halo stars, which favors the blue straggler analog hypothesis.

High-energy photon induced spallation reactions in 127I

1970 ◽  
Vol 153 (1) ◽  
pp. 32-48 ◽  
Author(s):  
G.G. Jonsson ◽  
B. Persson
Keyword(s):  
High Energy ◽  
High Energy Photon ◽  
Energy Photon ◽  
Spallation Reactions

On the nucleon effective mass role to the high energy proton spallation reactions

2016 ◽  
Vol 948 ◽  
pp. 78-92 ◽  
Author(s):  
B.M. Santos ◽  
A.R.C. Pinheiro ◽  
M. Gonçalves ◽  
S.B. Duarte ◽  
R.G. Cabral
Keyword(s):  
Effective Mass ◽  
High Energy ◽  
High Energy Proton ◽  
Spallation Reactions ◽  
Energy Proton

Transmutation of129I with High Energy Neutrons Produced in Spallation Reactions Induced by Protons in Massive Target

2002 ◽  
Vol 39 (sup2) ◽  
pp. 1248-1251 ◽  
Author(s):  
V. Henzl ◽  
D. Henzlova ◽  
A. Kugler ◽  
V. Wagner ◽  
J. Adam ◽  
...  
Keyword(s):  
High Energy ◽  
Spallation Reactions

Delayed neutrons and high-energy γ-rays from decay of 87Br

1977 ◽  
Vol 293 (3) ◽  
pp. 410-424 ◽  
Author(s):  
F.M. Nuh ◽  
D.R. Slaughter ◽  
S.G. Prussin ◽  
H. Ohm ◽  
W. Rudolph ◽  
...  
Keyword(s):  
High Energy ◽  
Delayed Neutrons ◽  
Γ Rays

New study of various target neutron yields from spallation reactions using a high-energy proton beam

2019 ◽  
Vol 13 (2) ◽  
pp. 120
Author(s):  
Otman Jaï ◽  
Otman El Hajjaji ◽  
Ahmed Dadouch ◽  
Mohamed Bencheikh ◽  
Abdessamad Didi
Keyword(s):  
Proton Beam ◽  
High Energy ◽  
High Energy Proton ◽  
Spallation Reactions ◽  
Energy Proton
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