Effect of cluster polarization on the spectrum of the 7Li nucleus and on the reaction 6Li(n, 3H)4He

Three-cluster model of radiative capture reactions in seven-nucleon systems. Effects of cluster polarization

“…We now slightly modify the microscopic model whose details are presented in [38,39]. The novelty of the present model is that we included a mixture of states with different total spins S and total orbital momenta L. In [38,39], we restricted ourselves with the total spin S = 1/2, and, thus, the total orbital momentum was a good quantum number.…”

“…Second, in our recent works [38,39], we formulated a microscopic three-cluster model which was specially designed to consider the polarizability of interacting clusters. We called it the cluster polarization.…”

“…In our early works [40][41][42], we demonstrated that the collective monopole and quadrupole polarizations have very large effects on the radiative capture and photodisintegration reactions. Here, we consider a more important and prominent type of polarization, as it was shown in [38,39]. As in [38,39], we will use the three-cluster configuration 4 He + d + p ( 4 He + d + n) to consider the binary channels 4 He + 3 He and 6 Li + p ( 4 He + 3 H and 6 Li + n) in 7 Be ( 7 Li).…”

“…Here, we consider a more important and prominent type of polarization, as it was shown in [38,39]. As in [38,39], we will use the three-cluster configuration 4 He + d + p ( 4 He + d + n) to consider the binary channels 4 He + 3 He and 6 Li + p ( 4 He + 3 H and 6 Li + n) in 7 Be ( 7 Li). Similarly to [38,39], we take the polarizability of clusters 6 Li and 3 He ( 3 H) represented by the two-cluster configurations 4 He + d and d + p (d + n), respectively, into account.…”

“…As in [38,39], we will use the three-cluster configuration 4 He + d + p ( 4 He + d + n) to consider the binary channels 4 He + 3 He and 6 Li + p ( 4 He + 3 H and 6 Li + n) in 7 Be ( 7 Li). Similarly to [38,39], we take the polarizability of clusters 6 Li and 3 He ( 3 H) represented by the two-cluster configurations 4 He + d and d + p (d + n), respectively, into account. We assume that the polarizability of these clusters affects the cross sections or the astrophysical S factor of the capture reactions in the low-energy region.…”