Microscopic study of the low-energy3H(d, n)4He reaction

Abstract

Abstract.We have studied the 3H(d, n)'~He reaction at low energies within a multi-channel resonating-group calculation based on many-body n + e and d + 3H configurations and pseudo-states as well as on an effective nucleonnucleon interaction containing central, spin-orbit, and tensor components. The low-energy fusion cross section is excellently reproduced within our approach.

Two-pole structure of the 3/2+resonance ofHe5Csótó1, Lovas2, At3 1993Phys. Rev. Lett.402372View full textAdd to dashboardCite

“…These data have been reproduced in Ref. [13], and we can also reproduce the very similar phase shifts of a -f p scattering [19]. Indeed, with a slight reduction of the coupling strength, we can also produce a similar a+n curve (dashed line), but, at the same time, the agreement int^-d breaks down.…”

“…In choosing the parameters we rely on Bliige and Langanke [12,13], who calculated astrophysical S factors in a similar model. So, for the central term of the interaction we employed the Minnesota force given in Ref.…”

“…Since the resulting distance between the t -\-d and a -h n thresholds, 19.6 MeV, somewhat differs from experiment (17.6 MeV), we fixed our energy scale to the t^d threshold, and cared about the quality of description only in this region. We set the free space-exchange parameter [14] to u = 0.835 [12,13], and used the spin-orbit force of Reichstein and Tang [15], with strength and width of -224.8 MeV and 0.707 fm, respectively. We followed Ref.…”

“…We followed Ref. [13] also in adopting a slightly modified version of the tensor interaction of Heiss and Hackenbroich [16].…”

Ab Initio Nuclear Reaction Theory with Applications to Astrophysics

“…Consensus on the physics mechanism behind this enhancement is not been reached yet [125], largely because of the difficulty of determining the absolute value of the bare cross section. Past theoretical investigations of these fusion reactions include various R-matrix analyses of experimental data at higher energies [126,127,128,129] as well as microscopic calculations with phenomenological interactions [130,131,132]. However, in view of remaining experimental challenges and the large role played by theory in extracting the astrophysically important information, it is highly desirable to achieve a microscopic description of the 3 H(d,n) 4 He and 3 He(d,p) 4 He fusion reactions that encompasses the dynamic of all five nucleons and is based on the fundamental underlying physics: the realistic interactions among nucleons and the structure of the fusing nuclei.…”