N14(n,d)C13,

Peter Fessenden

¹

,

D.R. Maxson

²

Abstract

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.

Measurement of 14N (n,t)12C Reaction Cross Section in the Energy Range of 5.0 to 10.6 MeV

“…refs. [6][7][8][9][10] and studies were directed towards the measurement of the angular distributions of emitted tritons.…”