The cross section between 1.5 and 7.8 MeV

High-resolution gamma ray spectroscopy measurements of the fast ion energy distribution in JET 4He plasmas

“…The angular distribution of the emitted neutrons in the c.m. frame is not isotropic and shows an increased forward peaking as the energy of 4 He ions is raised [20,21], which affects the Monte Carlo simulated peak shape.…”

“…In particular, data from [20,21] were used to obtain the total, as well as differential, cross section for production of the 4.44 MeV peak from the 9 Be(α, nγ ) 12 C reaction up to E α = 6 MeV (figure 2, top). The cross section is negligible below E α < 1 MeV and displays a non-trivial behaviour as a function of energy with major resonances at E α ≈ 2.0, 2.9, 4.3, 5.5 MeV.…”

The neutron continuum from the9Be+α reaction

“…This recoil spectrum was calculated from the higher energy neutron data of Ref. [2] using the same Monte Carlo Code and normalized at the high energy end of the measured recoil spectrum. Fig.…”

“…For a-energies of up to 14 MeV extensive cross section information for the production of these groups is available. The two most recent investigations by Obst et aL [1] and by Van der Zwan and Geiger [2] list earlier references.…”

The role of 13C excited states in α+9Be reaction and scattering cross sections

“…In this framework, we performed a comprehensive R-matrix fit of α+ 9 Be elastic (α 0 ) and inelastic (α 1 and α 2 ) scattering data in the energy range E 3.5 -10 MeV at several angles [23,24]. To carefully determine the partial decay widths of states above the α decay threshold we included in the fit procedure also 9 Be(α, n 0 ) 12 C gs and 9 Be(α, n 1 ) 12 C 4.44 cross section data taken from [25,26]. With the exception of 9 Be(α, n 2 ) 12 C 7.65 (that is open above E α =2.8 MeV) and radiative capture reactions, these reaction channels are the only ones open at low energies.…”