Energy levels of light nuclei A = 4

Evidence for boson-mode excitations in the16O(α,n) and20Ne(α,n) excitation functions

“…The first excited state (e*) of the free a-particle is internally symmetric [15] at 20.2 MeV with a width of about 0.7 MeV and J~=0 + (Ref. [16]). A similar structure can exist as one of the clusters in the compound nucleus.…”

Photoneutron Cross Section forHe4

“…Two broad J 7r = 1", T= 1 states are expected to dominate the photoabsorption cross section for He 4 below 30 MeV. 21 It is clear from the shape of the cross section of Fig. 1 that this is likely to be the case.…”

The (2H-d)-reactions below 200 keV

“…The data of Booth et aL [24] and McNeill and Keyser [25] were omitted because of their large error bars. 3.3 and 4.1 MeV respectively) and the smooth behaviour of the n-aHe and p-aH scattering at the relevant energies [8]. Within this approach, one is left with the "intrinsic reaction probabilities" which should be independent of energy.…”

“…Naturally these two reactions have been the objects for theoretical studies of nuclear reaction phenomena from the very beginning [4,6,7]. A long series of experimental and theoretical papers demonstrates the continuous interest in them [8,9].…”

“…In spite of a very large number of experiments [8], there is not too much which can be compared directly. Because of the very low energies more or less thick targets have been used in the experiments, ranging from a few keV to a target thickness larger than the range of the bombarding deuterons used.…”