Photodisintegration of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:mrow><mml:mn>13</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>

Cook, B.C.

doi:10.1103/physrev.106.300

Cited by 96 publications

(23 citation statements)

References 40 publications

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“…However, the 5-wave direct interaction cross-section peaks at 15 Mev. The magnitude of the cross section at the peak is quite small and, therefore, its presence cannot completely explain the broad resonance 34 in the C 13 (y,w) cross section which appears at the base of the giant resonance bump. The magnitude of the direct interaction s-wave cross section may be enhanced considerably by the inclusion of the first correction term to the single particle model.…”

Section: Discussionmentioning

confidence: 89%

Photoneutron Disintegration Below the Giant Resonance: Beryllium-9 and Carbon-13

Francis¹,

Goldman²,

Guth

1960

Phys. Rev.

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The photoneutron cross sections of Be d and C 13 have been calculated. A single particle model is used to describe the incident bound and final continuum distorted states. Using reasonable potential well parameters, the calculated Be(y,») cross section near threshold is in agreement with experiment. Cross sections for transitions to both the s\ and d\ final states in C 12 are calculated for y-ray energies below 10 Mev. The calculated cross section is three times as large as the measured value at 6.4 Mev. The thermal neutron capture cross section in C 12 was calculated and the error persisted in magnitude and sign. Origins of the inaccuracies in the model are discussed. Angular distribution and polarization formulas are presented.

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Section: Discussionmentioning

confidence: 89%

Photoneutron Disintegration Below the Giant Resonance: Beryllium-9 and Carbon-13

Francis¹,

Goldman²,

Guth

1960

Phys. Rev.

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“…The isotopie abundante of 13C is about 1%, but the (7, n) cross section is rather high [14]. If a]l ~C nue]ei populate the 15.11 MeV state, the ratio would ehange 0 is smaUer than 6~t~ z, o 6~t~ z.…”

Section: ~=E[mc~ J mentioning

confidence: 99%

Scattering of photons at the 15.11 MeV energy level in12C

Mehlig¹,

Czock

1976

Acta Physica

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The 15.11 MeV energy level in x2C was excited by bremsstrahlung. The seattered photons were detected with a total ? absorption NaI(TI)apoetrometer set at 135 ~ to the bremsstrahlung beato. The following level parameterswere obtained: ~r ~ = (17.9 :~ 0.6) barn,/'tot = (69 • 4) eV and ain t--~ (1.86 • 0.12) mb MeV. The branching ratio to the first excited state and the ground state is F?l//'?o = (3.6 + 1.0)%.

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“…It has been suggested (Cook 1957) that integrated cross sections be computed directly, and that cross sections be found by differentiation. If 10k is the directly computed integrated cross section ordinate, corresponding to the exact ordinate 1(E ok ), it is r"~f" …”

Section: See) =8 Exp[ -4(ln 2)(e-e M )2/r 2 ] S(e) =S(e) + (~E1124){mentioning

confidence: 99%

Resolution of Bremsstrahlung Experiments

Thies¹

1961

Aust. J. Phys.

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SummaryThis paper investigates how mathematical approximations and statistical errors are transmitted into computed cross sections in the analysis of experimental bremsstrahlung yield data. The resolution of bremsstrahlung experiments is defined in analogy with optical resolution and an expression for the practical evaluation of resolution is derived. Methods of cross-section computation, and smoothing and curve-fitting are discussed. ERROR INHERENT IN THE YIELD ANALYSISThe bremsstrahlung experiment measures the yield of a photonuclear reaction. The corresponding cross section is derived by a transformation calculation. This investigation is concerned with how approximations in the transformation calculation and standard errors of the original discrete set of experimental yield ordinates are propagated into the computed cross section, and how well the computed cross section portrays the true (exact) cross section. It is assumed that the bremsstrahlung spectrum is known and that experimental yield ordinates contain no other than truly statistical errors.Yield y(E Ok ) and cross section s(E) are related through the normalized bremsstrahlung distribution function P(E,E ok ) by the integral equation I EOk y(E Ok )= P(E,Eok)s(E)dE. Eth (1)EOk is the maximum energy of the speetrum, E=hv the energy of a photon interacting with a nucleus, and E th the reaction threshold. Experimental yield data are invariably given as a discrete set of yield values only and not as a continuous function. Thus the knowledge about the yield function is restricted to that of a finite number of yield ordinates, and nothing is known a priori about the behaviour of the function between these ordinates. Ei=Eoi-ttlE;, and s(Ei ); i=l, 2, .. 'J p represents a discrete set of cross-section ordinates which are to approximate ordinates S(Ei) of the exact cross section s(E). Any approximation other than

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Photodisintegration ofC13

Cited by 96 publications

References 40 publications

Photoneutron Disintegration Below the Giant Resonance: Beryllium-9 and Carbon-13

Photoneutron Disintegration Below the Giant Resonance: Beryllium-9 and Carbon-13

Scattering of photons at the 15.11 MeV energy level in12C

Resolution of Bremsstrahlung Experiments

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