Elastic Scattering of Deuterons by Lithium-7

Abstract

The elastic scattering of deuterons by lithium-7 nuclei has been investigated in the energy region from Ed=0A0 to 1.80 MeV. The scattering cross sections tend to be lower than the Rutherford value below about 0.85 MeV, and then rise to values several times the Rutherford value for higher energies. A conspicuous anomaly in the scattering cross section occurs near 1 MeV, where the reaction cross sections also show resonances, while there is no prominent scattering anomaly corresponding to the reaction resonances near 0.80 MeV. The apparent presence of broad overlapping energy levels in the compound nucleus, together with the incomplete nature of the data on the various reaction cross sections, has prevented a detailed theoretical analysis of the elastic scattering over the energy region investigated. An s-wave analysis, however, does provide an adequate fitting of the scattering angular distributions up to about 1 MeV, and the relatively sharp scattering anomaly near 1 MeV appears to be due to £-wave deuterons. When elastic-scattering data over a wider energy region and more accurate reaction cross sections become available, it may be possible to extract more quantitative information from the present data. .

Deuteron-induced nucleon transfer reactions within anab initioframework: First application top-shell nuclei

“…7 (blue dash-dotted line). Compared to the (d, 7 Li) NCSM/RGM results (green dashed line), the first peak is roughly the same (save for differences in the energy grids used in the two calculations) while the second becomes much more pronounced and narrower due to the inclusion of the 9 Be eigenstates, which have also the effect of bringing the calculated differential cross section closer in magnitude to the experimental data of Ford [39]. In this experiment, the 7 Li(d,d) 7 Li cross section shows an enhancement at about 0.8 MeV and a resonance around 1 MeV, which were found to be compatible with deuterons traveling in Sand P -wave, respectively.…”

“…Here, we will compare the differential cross section at the deuteron c.m. scattering angle of 90 • of Ford [39] with the results of calculations performed within a model space spanned exclusively by d− 7 Li channel states, as well as with those obtained by further including either 9 Be eigenstates or p− 8 Li channel states.…”

“…Li cross section below the deuteron breakup energy has been measured with the aim to investigate the resonant states of 9 Be above the d+ 7 Li threshold [39][40][41]. Here, we will compare the differential cross section at the deuteron c.m.…”

Measurement of the differential cross sections of natLi(d,d0) for EBS purposes

“…The excitation functions were produced while the experiment was carried out and for 6 Li and 7 Li are presented in figs. 1a, 1b and 1c, along with the only existing measurement of the differential cross section of the 7 Li(d,d 0 ) elastic scattering [1].…”

“…1c. The excitation function of 7 Li at 140 o along with the cross section measurement by J.L.C.Ford [1] at 125 o (1964, the only existing differential cross section measurement in literature [1]).…”