Interaction of 4.1-Mev Neutrons with Nuclei

Walt, M.; Beyster, J.R.

doi:10.1103/physrev.98.677

Cited by 97 publications

(11 citation statements)

References 10 publications

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“…Other groups have also measured differential elastic scattering t A portion of a doctoral dissertation submitted by James E. Wills cross sections in the energy range below 4.8 Mev. [11][12][13][14] A re-examination of the narrow level with better energy resolution, and additional data on the angular distributions was felt worthwhile in order to determine the detailed properties of these levels in C 13 . Recent work on the mirror reaction C l2 -\~p has been extended to higher energies 15 making a direct comparison of the N 13 -C 13 excited states possible.…”

Section: Introductionmentioning

confidence: 99%

Scattering of Fast Neutrons fromC12andF19

et al. 1958

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High-resolution total cross-section measurements were made in the vicinity of the neutron scattering resonance occurring in C 12 at (2.076±0.008)-Mev bombarding energy with a total width of 7 kev. These data, coupled with differential cross-section measurements in the same energy range, lead to the assignment of D5/2 to this state in C 13 . Angular distributions of neutrons scattered from C 12 measured between 1.45 and 4.10 Mev were analyzed in terms of partial waves. The resulting phase shifts indicate that the D 3 / 2 state occurring at 2.95 Mev has a width of 90 kev, while the D z /2 state at 3.67 Mev has a width of 1.69 Mev.Total cross-section measurements for fluorine, having resolutions of 20 and 70 kev, indicate the presence of resonances at 1.10 and 2.25 Mev, as well as some structure above 3 Mev not previously reported. Angular distributions were measured between 0.66 and 2.92 Mev.

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Section: Introductionmentioning

confidence: 99%

Scattering of Fast Neutrons fromC12andF19

et al. 1958

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“…These and other heterogeneous scintillators for the detection of fast and slow neutrons are discussed in Sections 13.1.6. and 7. Walt and Beyster (1955) have used a neutron detector, consisting of nine plastic scintillator spheres, each 0-1 in. diameter, separated from each other by about 1 cm of clear quartz and coupled to a DuMont 6467 photomultiplier, for measurements over a limited range of neutron energies from 2 to 4-1 MeV.…”

Section: Heterogeneous Scintillators For N|y Discriminationmentioning

confidence: 99%

Applications of Organic Scintillators

Birks

1964

The Theory and Practice of Scintillation Counting

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“…The density of all levels for a particular excitation energy U is given by the summation £/p(tf,/) = p(E0, (8) where p(U) is given by Bloch 21 in the form p(C7) = [ < rD r -(96ir)*]-1 exp[x(2J7/38)*], (9) and 8 was shown by Ross 22 to be given by l/«=l/5n+l/«p. …”

Section: Distribution Of the Angular Momenta Among The Nuclear Levelsmentioning

confidence: 99%

Distribution of the Angular Momenta, Level Spacings, and Neutron Widths ofAl28

Hibdon

1959

Phys. Rev.

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The neutron total cross section from about 1 kev to 450 kev shows the presence of sixty-six peaks, seven of which are of the s-wave variety. Thirteen resonances are attributable to J=0, twenty-one to /=1, eighteen to J = 2, ten to / = 3, and three to 7=4. This distribution is in agreement with the theoretical distribution for a value of 2CT S=2O-2 = 6. The density of all levels for this energy interval is 146 Mev" 1 and the average level spacing of the nucleons is 0.48 Mev. The neutron widths vary from 1 to 7 kev and the distribution of the reduced widths appears to agree with an exponential distribution and is also in fair agreement with the Porter-Thomas distribution. The level spacings also agree with an exponential distribution. As obtained from the reduced widths averaged over both values of /, the value of the strength function for 1=0 is 0.05, averaged over all values of / for /= 1 it is 0.49, and for 1 -2 it is too large in comparison with the ^-wave strength function. The particularly low value of the cross section below 30 kev and the shape of the wings of the 35-kev resonance can be explained by a multiple-level computation of the interference of the s-wave levels. On the basis of the results of the present analyses, the levels are about equally divided between the odd and even values of /. 7 Roher, Newson, Gibbons, and Cap, Phys. Rev. 95, 302(A) (1954).

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Interaction of 4.1-Mev Neutrons with Nuclei

Cited by 97 publications

References 10 publications

Scattering of Fast Neutrons fromC12andF19

Scattering of Fast Neutrons fromC12andF19

Applications of Organic Scintillators

Distribution of the Angular Momenta, Level Spacings, and Neutron Widths ofAl28

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