14N(n, α)11B reaction at 14.1 MeV

(n, ?) Reactions on light nuclei atE n =13.9 MeV

“…The angular distribution of the e o group from the reaction i 4N(n, e) iiB as presented in Figure 4a shows a strong forward peak and a slower rise at backward angles together with minima at about 60 ~ and 120 ~ and a small maximum at about 90 ~ Our measurement at E, = 13.9 MeV is in good agreement with the results at 14.1 MeV [5,7,9,10] and at 14.9 MeV [8]. The angular distribution of the a-particles leading to the first excited state of 11B (Fig.…”

“…In continuation of our previous studies of (n, c~) reactions on light nuclei, we have measured in the present experiment the reactions ~ ~N(n, e)l 1B and l~ c~)TLi at a neutron energy E, = 13.9 MeV. Up to now the reaction l*N(n, e)llB has been observed in some experiments at neutron energies near 14 MeV using cloud chambers [71, nuclear emulsions [8,9], scintillation counters [5], and counter telescopes [10,11], whereas the reaction t~ ~)TLi has been previously investigated only in one experiment at E, = 14.4 MeV [12].…”

The (n,α) reactions on11B,14N and16O with 14 MeV neutrons

“…Leroux et al [17], and Bachinger et al [14] (relative measurement, normalized at 80 ~ measured the angular distributions for e0 and el with nuclear [19] and K6nig et al [13] used counter telescopes. All measurements of the % group presented concentrate around a common shape, characterized by a marked maximum in the foreward direction and a slower rise at backward angles.…”

“…However the experimental results show no systematic trend and are even sometimes contradictory. So Rendi6 et aL [11] at 14 MeV for 19F(n, 0~)16N and Sick et al [20] for 160(n, 0~)13C above 14.8 MeV can explain their data with the assumption of compound nucleus formation, whereas in some newer papers [13][14][15][16][17][18][19] on 160(n, c~)13C and 14N(n, e)llB the experimental results can be interpreted in terms of direct reaction mechanisms. However, according to Salathe et al [21], the 14N(n, e)llB reaction for neutron energies from 15 to 19 MeV predominantly proceeds via compound nucleus formation.…”