SEARCH FOR SUCCESSIVE NEUTRON CAPTURE REACTIONS ON Mg26, Si30, AND Cr54

1957 ◽  
Vol 35 (2) ◽  
pp. 176-179 ◽  
Author(s):  
L. P. Roy ◽  
L. Yaffe
Keyword(s):  
Cross Section ◽  
Neutron Capture ◽  
Capture Cross Section ◽  
Second Order ◽  
Capture Cross ◽  
Neutron Capture Cross Section ◽  
Maximum Value ◽  
The Cross ◽  
Intense Neutron ◽  
Stable Nuclides

Stable nuclides exposed to intense neutron fluxes may produce second order reactions by successive capture of two neutrons. This method has been applied in the present work in an attempt to determine the pile neutron capture cross section of three unstable nuclides, namely: Mg27, Si31, and Cr55. A maximum value of 0.04 barn has been obtained for the cross section of Mg27. Assuming that Si32 and Cr56 are long-lived, minimal ratios of 600 and 270 years/barn respectively were obtained for [Formula: see text]

scholarly journals Work on the neutron standards since the completion of the standards evaluation

2020 ◽  
Vol 239 ◽  
pp. 08001
Author(s):  
Allan Carlson
Keyword(s):  
Cross Section ◽  
Neutron Capture ◽  
Capture Cross Section ◽  
Neutron Cross Section ◽  
Capture Cross ◽  
Neutron Capture Cross Section ◽  
Paper Work ◽  
The Cross

An evaluation of the neutron standards that included the neutron cross section standards was recently completed. It is important to maintain experimental programs to increase the quality and extend the database for the neutron cross section standards in order to improve evaluations of them. In this paper work will be reported on new or continuing efforts on the cross section standards including that on the 30 keV Maxwellian averaged cross section for the 197Au(n,γ) reaction that is now a standard and is used in neutron capture cross section measurements as a standard for reactions important for astrophysics.

THERMAL NEUTRON CAPTURE CROSS SECTION OF Ce142

1956 ◽  
Vol 34 (8) ◽  
pp. 1023-1026 ◽  
Author(s):  
L. P. Roy ◽  
L. Yaffe
Keyword(s):  
Thermal Neutron ◽  
Cross Section ◽  
Neutron Capture ◽  
Capture Cross Section ◽  
Activation Method ◽  
Thermal Neutron Capture ◽  
Capture Cross ◽  
Neutron Capture Cross Section ◽  
A Value ◽  
The Cross

The cross section of Ce142 has been determined by the activation method and found to be 0.95 ± 0.05 barns relative to a value of σCo59 = 36.3 barns. Disintegration rates were determined by a 4π counter. The value obtained agrees with that of Katcoff etal. (1949) also obtained by the activation method but differs markedly from that of Pomerance (1952).

REACTOR NEUTRON-CAPTURE CROSS SECTION OF 18-MINUTE Rb88

1958 ◽  
Vol 36 (5) ◽  
pp. 731-736 ◽  
Author(s):  
J. C. Roy ◽  
P. J. Berry ◽  
L. P. Roy
Keyword(s):  
Beta Decay ◽  
Cross Section ◽  
Neutron Capture ◽  
Capture Cross Section ◽  
Activation Method ◽  
Reactor Neutron ◽  
Capture Cross ◽  
Neutron Capture Cross Section ◽  
The Cross ◽  
Thermal Cross Section

The reactor neutron-capture cross section of 18-minute Rb88 has been determined by an activation method. The yield of Rb89 formed by successive neutron capture in Rb87 was determined by counting the beta rays emitted by its daughter, 51-day Sr89. In these experiments Sr89 is also produced by the Sr88(n, γ)Sr89 reaction from the Sr88 contamination in the rubidium target and from Sr88 formed by the beta decay of Rb88. Corrections for the contributions from these sources to the yield of Sr89 have been measured experimentally. The reactor neutron-capture cross section of Sr88 has been measured to be 5.8 mb. for the conditions of the experiment. Taking 0.12 ± 0.3 barn for the thermal cross section of Rb87, the cross section of Rb88 was found to be 1.0 ± 0.3 barn for reactor neutrons.

Measurements of the neutron capture cross section of 243Am around 23.5 keV

2021 ◽  
pp. 1-6
Author(s):  
Yu Kodama ◽  
Tatsuya Katabuchi ◽  
Gerard Rovira ◽  
Atsushi Kimura ◽  
Shoji Nakamura ◽  
...  
Keyword(s):  
Cross Section ◽  
Neutron Capture ◽  
Capture Cross Section ◽  
Capture Cross ◽  
Neutron Capture Cross Section

THERMAL NEUTRON CAPTURE CROSS-SECTION OF Na23 AND Mn55

1953 ◽  
Vol 31 (3) ◽  
pp. 204-206 ◽  
Author(s):  
Rosalie M. Bartholomew ◽  
R. C. Hawkings ◽  
W. F. Merritt ◽  
L. Yaffe
Keyword(s):  
Thermal Neutron ◽  
Cross Section ◽  
Cross Sections ◽  
Neutron Capture ◽  
Half Life ◽  
Capture Cross Section ◽  
Thermal Neutron Capture ◽  
Capture Cross ◽  
Neutron Capture Cross Section ◽  
Capture Cross Sections

The thermal neutron capture cross sections of Na23 and Mn55 have been determined using the activation method. The values are 0.53 ± 0.03 and 12.7 ± 0.3 barns respectively with respect to σAul97 = 93 barns. These agree well with recent pile oscillator results. The half-life for Mn56 is found to be 2.576 ± 0.002 hr.

scholarly journals The 236U neutron capture cross-section measured at the n_TOF CERN facility

2017 ◽  
Vol 146 ◽  
pp. 11054
Author(s):  
M. Mastromarco ◽  
M. Barbagallo ◽  
M.J. Vermeulen ◽  
N. Colonna ◽  
S. Altstadt ◽  
...  
Keyword(s):  
Cross Section ◽  
Neutron Capture ◽  
Capture Cross Section ◽  
Capture Cross ◽  
Neutron Capture Cross Section
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