A new measurement of the astrophysical 8Li(d, t)7Li reaction

The8Li(p,α)5He reaction at low energies, andMendes1, Lépine‐Szily2, Descouvemont3 et al. 2012Phys. Rev. C

“…This is interpreted, in an R-matrix analysis, as a superposition of two overlapping resonances, one of them being an s wave. A broad peak is also observed in the 8 Li(d, t) 7 Li reaction [29] and increases the reaction rate. Our low-energy data also provide evidence for the role of a subthreshold state in the S factor.…”

Three-triton states in9Li

“…In the 9 Li case, positive parity states correspond to higher nordal states, and this could be one of the reasons for the (slightly) large radius. However, it is not enhanced compared with the neutron-halo structure in 11 Li or Hoyle state in 12 C, and it is smaller than the yrast 1/2 + state (2.71 fm). It is also shown that the second 1/2 + state is affected when three triton states are coupled to the α+t+n+n basis states.…”

“…Another example is 10 Be; although all the low-lying states of 10 Be have been found to be well described by the combination of three molecular-orbits for the two valence neutrons around two α-clusters [9], the α+t+t cluster structure is found to coexist with the α+α+n+n structure around E x = 15 MeV, close to the corresponding threshold [10]. The existence of 7 Li+t cluster configuration of 10 Be has been reported in the recent experiment with 8 Li(d, t) 7 Li reaction [11,12], and since the 7 Li nucleus is well-known to be described as α+t cluster structure, the resonance state is considered to have the α+t+t cluster configuration. This is one of the first example that completely different cluster configurations of triton-type (α + t + t) and α type (α+α+n+n) coexist in a single nucleus around the same energy region.…”

“…Furthermore, not only α clusters, but also various other types of clusters are expected to appear in the excited states of neutron-rich nuclei around the corresponding threshold energies. One recent example is α+α+t structure; the third 3/2 − state of 11 B at E x = 8.56 MeV has been discussed to have the α+α+t structure from both theoretical and experimental sides [8]. Another example is 10 Be; although all the low-lying states of 10 Be have been found to be well described by the combination of three molecular-orbits for the two valence neutrons around two α-clusters [9], the α+t+t cluster structure is found to coexist with the α+α+n+n structure around E x = 15 MeV, close to the corresponding threshold [10].…”