Thermal neutron capture gamma rays from sulfur isotopes: Experiment and theory

Raman, S.; Carlton, R. F.; Wells, J.C.; Jurney, E.T.; Lynn, J. E.

doi:10.1103/physrevc.32.18

Cited by 70 publications

(44 citation statements)

References 43 publications

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“…Our thermal 34 S capture cross section is in good agreement with the recommended value [2]. Our 36 S result is consistent with the previous measurement of Raman et al [3].…”

Section: Methodssupporting

confidence: 93%

Measurement of direct neutron capture by neutron-rich sulfur isotopes

et al. 1997

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“…Our thermal 34 S capture cross section is in good agreement with the recommended value [2]. Our 36 S result is consistent with the previous measurement of Raman et al [3].…”

Section: Methodssupporting

confidence: 93%

Measurement of direct neutron capture by neutron-rich sulfur isotopes

et al. 1997

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“…The value W, j, can be written in terms of the Wigner W-coefficients and vector-coupling coefficients, and numerical values of Wj jj have been tabulated in ref. 17 ). Finally, the quantity 6f is the spectroscopic factor for the fractionation of the single-particle bound state into the final state f. The ideal situation in which eq.…”

Section: V) Rmentioning

confidence: 99%

“…Recent explicit work on the comparison of channel capture with the fuller version of slow-neutron direct capture (which 1s known as potential capture) as calculated in the optical model framework, with special reference to the sulfur Isotopes, is given in ref. 17 ). Briefly, within the optical model the radial dipole integral [eq.…”

Section: Optical Model Comparisons With the Channel-capture Formulamentioning

confidence: 99%

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Applications and Misapplications of the Channel-Capture Formalism of Direct Neutron Capture

Raman

Lynn

1986

Neutron Induced Reactions

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Abstract:We discuss the channel-capture approximation of slow neutron direct-capture theory. We show that this approximation gives a generally good representation of the neutron capture cross sections for several electric dipole transitions in a broad range of nuclides from A = 9 to A -136; these are mostly near-spherical nuclei. Despite this body of agreement, we examine the accuracy we can expect from the simple channel-capture theory. Comparison with calculations of the potentialcapture cross section from physically more realistic optical model calculations show that, in general, the channel-capture cross section can be up to -40% in error. In cases where the expected channel-capture cross section is much smaller than the "hard-sphere" capture cross-section estimate, the disagreement with potential capture can be much worse than this. Also, in these cases, compound-nucleus capture can be of comparable or greater magnitude. These effects have been shown to completely undermine recent attempts to determine nuclear interaction radii for targets, such as 12 C and 9 Be, by application of the channel-capture formula to capture cross-section data.

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“…It is estimated that the r-process nucleosynthesis in very neutron-rich nuclei is dominated by the direct process since the formation of the compound states is not likely in neutron-rich nuclei due to small neutron separation energy and small level density at the threshold [3,15,16]. Direct neutron capture calculations [15][16][17][18][19][20][21][22][23] often assumes a simple potential picture in which the initial and final states are described as scattering and bound single-particle states. However, one can expect that the new dipole excitation modes may affect the direct neutron capture process likewise in the case of the compound process.…”

Section: Introductionmentioning

confidence: 99%