THE GAMMA-NEUTRON CROSS SECTION FOR N14

1960 ◽  
Vol 38 (2) ◽  
pp. 231-239 ◽  
Author(s):  
J. D. King ◽  
R. N. H. Haslam ◽  
R. W. Parsons
Keyword(s):  
Theoretical Prediction ◽  
Cross Section ◽  
Sodium Iodide ◽  
Giant Resonance ◽  
Residual Activity ◽  
Neutron Cross Section ◽  
Resonance Region ◽  
X Ray ◽  
Integrated Cross Section ◽  
Iodide Crystal

The reaction N14(γ,n)N13 has been studied by irradiating dicyandiamide in the X-ray beam of a 25-Mev betatron and measuring the residual activity with a sodium iodide crystal system. The photoneutron cross section shows maxima at 11.7, 13.2, 15.2, 19.5, and 22.8 Mev, the last two being in the giant resonance region. The integrated cross section from threshold to the beginning of the giant resonance region is 1.8 Mev-mb, and this is compared with a recent theoretical prediction. During the course of the experiment, accurate measurements were made of the half-life of N13 and it was found to be 9.93 ± 0.05 minutes.

THE GAMMA-NEUTRON CROSS SECTION FOR F19

1960 ◽  
Vol 38 (8) ◽  
pp. 1069-1076 ◽  
Author(s):  
J. D. King ◽  
R. N. H. Haslam ◽  
W. J. McDonald
Keyword(s):  
Quadrupole Moment ◽  
Cross Section ◽  
Giant Resonance ◽  
Neutron Cross Section ◽  
Annihilation Radiation ◽  
Small Disturbance ◽  
X Ray ◽  
The Core ◽  
Intrinsic Quadrupole Moment ◽  
The Cross

The F19(γ,n)F18 reaction has been studied by irradiating teflon samples in the X-ray beam of a 25-Mev betatron and detecting the annihilation radiation emitted during the decay of the residual nuclei. The cross section shows maxima at 10.6 (very small), 12.4, 14.0, 16.1, 17.2, and 19.3 Mev. The peak at 12.4 Mev is possibly due to excitation of the last neutron in F19 with only a small disturbance of the core nucleons. The peaks at 14.0 and 19.1 Mev are interpreted as the components of a split giant resonance, indicating an intrinsic quadrupole moment, Q0, of approximately 0.30 × 10−21 cm2 for F19.

PHOTONEUTRON THRESHOLD AND CROSS SECTION FOR 71Lu175

1958 ◽  
Vol 36 (4) ◽  
pp. 415-418 ◽  
Author(s):  
H. J. King ◽  
L. Katz
Keyword(s):  
Cross Section ◽  
Neutron Yield ◽  
Giant Resonance ◽  
Threshold Energy ◽  
Half Width ◽  
Bremsstrahlung Energy ◽  
Resonance Cross Section ◽  
Integrated Cross Section ◽  
Peak Value

The neutron yield resulting from photoneutron reactions in Lu175 has been measured as a function of peak bremsstrahlung energy up to 23 Mev. The threshold energy for this reaction was found to be 7.77 ± 0.05 Mev. The giant resonance cross section has a peak value of 225 millibarns at 16 Mev., a half-width of 8.4 Mev., and an integrated cross section to 23 Mev. of 1.9 Mev-barns.

Total cross section measurements by X-ray detection of electron-capture residual activity

1973 ◽  
Vol 109 (2) ◽  
pp. 327-331 ◽  
Author(s):  
C.N. Chang ◽  
J.J. Kent ◽  
J.F. Morgan ◽  
S.L. Blatt
Keyword(s):  
Total Cross Section ◽  
Electron Capture ◽  
Cross Section ◽  
Residual Activity ◽  
X Ray

Photoneutron Cross Sections in 14N

1972 ◽  
Vol 50 (15) ◽  
pp. 1689-1696 ◽  
Author(s):  
R. W. Gellie ◽  
K. H. Lokan ◽  
N. K. Sherman ◽  
R. G. Johnson ◽  
J. I. Lodge
Keyword(s):  
Excited States ◽  
Cross Section ◽  
Cross Sections ◽  
Neutron Emission ◽  
Giant Resonance ◽  
Sequential Decay ◽  
Dipole Resonance ◽  
Intermediate States ◽  
Integrated Cross Section ◽  
High Degree

Photoneutron distributions from 14N have been obtained by time-of-flight methods, for bremsstrahlung end-point energies increasing in 2 MeV steps from 15.5 to 29.5 MeV. A large part of the neutron yield is associated with the sequential decay of 14N to 12C, through well-defined intermediate states of 13C, at 7.55, 8.86, and 11.80 MeV, which are unstable against neutron emission. The (γ,n0) cross section for neutron emission to the ground state of 13N is found to agree very closely with the corresponding (γ,p0) cross section, implying a high degree of isospin purity for the giant dipole resonance of 14N. It is observed that the decay of the giant resonance proceeds freely through those odd-parity excited states of the A = 13 nuclei which are single hole states formed by the removal of a p-shell nucleon from the parent 14N.The integrated cross section for all neutron-producing interactions is found to be 88 ± 5 MeV mb.

The photoneutron cross section of 151Eu, 153Eu and 156Gd in the giant resonance region

1983 ◽  
Vol 406 (2) ◽  
pp. 257-268 ◽  
Author(s):  
T.J. Boal ◽  
E.G. Muirhead ◽  
D.J.S. Findlay
Keyword(s):  
Cross Section ◽  
Giant Resonance ◽  
Resonance Region

Cross section and analyzing power measurements for the giant resonance region inPb208with 200-MeV protons

1986 ◽  
Vol 33 (6) ◽  
pp. 1943-1954 ◽  
Author(s):  
D. K. McDaniels ◽  
J. R. Tinsley ◽  
J. Lisantti ◽  
D. M. Drake ◽  
I. Bergqvist ◽  
...  
Keyword(s):  
Cross Section ◽  
Giant Resonance ◽  
Resonance Region ◽  
Power Measurements ◽  
Mev Protons ◽  
Analyzing Power

scholarly journals Neutron Cross Section Processing Methods for Improved Integral Benchmarking of Unresolved Resonance Region Evaluations

2016 ◽  
Vol 111 ◽  
pp. 06001
Author(s):  
Jonathan A. Walsh ◽  
Benoit Forget ◽  
Kord S. Smith ◽  
Forrest B. Brown
Keyword(s):  
Cross Section ◽  
Neutron Cross Section ◽  
Resonance Region ◽  
Processing Methods

scholarly journals Neutron Cross section Covariances in the Resonance region: 50,53Cr, 54,57Fe and 60Ni

2010 ◽  
Author(s):  
P. Oblozinsky ◽  
Y.-S. Cho ◽  
C.M. Mattoon ◽  
S.F. Mughabghab
Keyword(s):  
Cross Section ◽  
Neutron Cross Section ◽  
Resonance Region
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