Optical model analysis of scattering of 14 MeV neutrons by light nuclei

Lutz, H.F.; Mason, J.B.; Karvelis, M.D.

doi:10.1016/0029-5582(63)90893-9

Cited by 34 publications

(2 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…21,22 The optical potential employed in the program is shown in Table II along with the values for the parameters used in the present experiment. The parameters for the 14.1-MeV neutrons incident on N 14 are identical, except for a slightly larger radius used in the present case, to the optical-model parameters determined by Lutz 23 for #+N 14 elastic scattering at 14 MeV. The elastic-scattering parameters for the outgoing <2+C 13 channel were not available, so the form-factor parameters were taken to be the same as those found by Smith and Ivash in their analysis of light nuclei.…”

Section: Methodsmentioning

confidence: 97%

N14(n,d)C13,
Fessenden
¹
,
Maxson
²

1967
Phys. Rev.

View full text Add to dashboard Cite

A triple-coincidence counter telescope consisting of two thin silicon surface-barrier dE/dx detectors (114 fj. total thickness) and a Csl E detector was used with a pulse-multiplier particle-discrimination system to detect the charged particles emanating from nuclear reactions induced by 14.1-or 14.8-MeV neutrons. Angular distributions of the outgoing charged particles from the ground-state transitions of N 14 («,d)C 13 and ~N u (n,t)C 12 were measured out to a center-of-mass angle of 100° for 14.1-MeV incident neutrons. The (n,d) distribution was fitted with two / = 1 theoretical curves calculated from the Butler and distorted-wave Born-approximation (DWBA) theories. The (n,t) results were fitted by two 1-2 curves calculated from the double-stripping theory of Newns and the diffraction theory of Dar, .and were compared to previous results obtained for C 12 (He 3 ,£)N 14 . Charged particles corresponding to the excited-state transitions N 14 (M)C 13 (£* = 3.68 MeV) and W*(n,t)C 12 (£^ = 4.43 MeV) were detected at forward angles. Angular distributions for the W b (n,d)C u (E x = 0) reaction were measured out to 60 degrees for E»=14.1 and 14.8 MeV. The 14.8-MeV data were fitted with Butler and DWBA curves for / = 1, but the 14.1-MeV data were inconsistent with a pure-direct-reaction interpretation. The results agree with previous measurements on the inverse C u (d,n)W b reaction, and indicate that a compound-nucleus mechanism contributes strongly near 14.9 MeV of excitation in the N 16 compound nucleus. Absolute reduced widths 0 2 and spectroscopic factors C 2 S were extracted from the fits to the N 14,16 (w,d) (E x -0) reactions.

show abstract

Section: Methodsmentioning

confidence: 97%

N14(n,d)C13,
Fessenden
¹
,
Maxson
²

1967
Phys. Rev.

View full text Add to dashboard Cite

show abstract

“…The parameters for this potential were primarily taken from Ref. [15], which gives an OMP obtained by fitting cross section data from the 9 Be(n,n) reaction at 14 MeV and is a reasonable approximation to the present case. The depth, radius, and diffuseness parameters of the real potential (V OM , r OM , and a OM ), the surface imaginary potential (W S , r S , and a S ), and the spin-orbit potential (V SO , r SO , and a SO ) are presented in Table I.…”

Section: Direct Capture Calculationmentioning

confidence: 99%

Polarization asymmetries in theBe9(γ,n0)reaction

et al. 2015

View full text Add to dashboard Cite

Measurements of the 9 Be(γ,n 0 ) reaction were performed using nearly 100% linearly polarized, high-intensity, and nearly-monoenergetic γ-ray beams having energies between 5.5 MeV and 15.5MeV at the High Intensity γ-ray Source (HIγS) located at Duke University and Triangle Universities Nuclear Laboratory. Eighteen liquid scintillator detectors were used to measure neutron yields parallel and perpendicular to the plane of beam polarization. Polarization asymmetries, which are the differences between yields observed in detectors located in-plane and out-of-plane divided by their sums, were measured for the neutrons which left the residual nucleus ( 8 Be) in its ground state, termed the n 0 group. Asymmetries between 0.4 to 0.7 were discovered over this energy region in addition to a clear trend of increasing asymmetries with increasing beam energy. A prediction of the polarization asymmetry based on a pure E1 direct capture model shows good agreement with the experimental measurements. These data and the prediction could be of interest for methods that rely on neutron measurements following photofission to identify the presence of special nuclear material.

show abstract