T=1 states in20Ne as compound resonances induced by the p+19F reactions

New determination of proton spectroscopic factors and reduced widths for $^{8}$Be states in the $16.5-18.0$ MeV excitation energy region via the study of the $^{7}$Li($^{3}$He,d)$^{8}$Be transfer reaction at E$_{lab}$ $=\ 20$ MeV

“…As can be seen in this figure, the 2 + (16.626) state is then much more populated than the 2 + (16.922) upper state in the 7 Li( 3 He,d)8 Be proton stripping reaction at bombarding energy, E lab = 20 MeV. Indeed, the ratio of the peak intensities (peak content areas) for these states, I 16.626 I 16.922 , amounts here to 5.3 for θ lab = 35 • and increases with decreasing the observation angle (see Figs (1,2)…”

“…That is, in reactions where the 7 Li + p configuration is favoured, the 2 + (16.626) state was observed to be typically much strongly populated relative to the weaker 2 + (16.922) state. This was particularly the case in the 7 Li(d,n) 8 Be proton stripping reaction (see reference [40] and references [1][2][3][4][5][6] therein). The measured neutron angular distributions from the latter reaction for high deuteron bombarding energy [41], never published in details, were found to have the following characteristics: (i) in the case of the 2 + (16.922) state, the neutron angular distribution showed strong forward peaking consistently with a ℓ = 1 stripping scheme with a differential cross section value of about 23 mb/sr at θ lab = 0 • , (ii) that of the 2 + (16.922) upper state was found to be essentially isotropic with an average cross section value of ∼ 0.87 mb/sr, hence a ratio (dσ/dΩ) 16.626 (dσ/dΩ) 16.922 ≃ 26.44.…”

“…The spectroscopic information on nuclear energy levels (excitation energies, spectroscopic factors, particle reduced widths,..) is crucial in nuclear physics regarding the structure of light and heavier nuclei. It is intensively used for describing, modeling and elucidating many nuclear structure problems such as isobaric analogue states, rotational bands, isospin mixing, two-level systems, α-particle clustering or exotic nuclear states (see [1][2][3][4][5] and references therein). This information is also of great interest to nuclear astrophysics where nuclear levels of particular structure often play a prominent role in big bang and/or in stellar nucleosyntheses (BBN, SN) [6][7][8].…”

New determination of proton spectroscopic factors and reduced widths forBe8states in the 16.5–18.0 MeV excitation energy region via the study of theLi7(Belhout1, Ouichaoui2, Beaumevieille3 et al. 2017Phys. Rev. CSelf Cite4000View full textAdd to dashboardCite

“…That is, in reactions where the 7 Li + p configuration is favoured, the 2 + (16.626) state was observed to be typically much strongly populated relative to the weaker 2 + (16.922) state. This was particularly the case in the 7 Li(d,n) 8 Be proton stripping reaction (see reference [40] and references [1][2][3][4][5][6] therein). The measured neutron angular distributions from the latter reaction for high deuteron bombarding energy [41], never published in details, were found to have the following characteristics: (i) in the case of the 2 + (16.922) state, the neutron angular distribution showed strong forward peaking consistently with a ℓ = 1 stripping scheme with a differential cross section value of about 23 mb/sr at θ lab = 0 • , (ii) that of the 2 + (16.922) upper state was found to be essentially isotropic with an average cross section value of ∼ 0.87 mb/sr, hence a ratio (dσ/dΩ) 16.626 (dσ/dΩ) 16.922 ≃ 26.44.…”

“…It is intensively used for describing, modeling and elucidating many nuclear structure problems such as isobaric analogue states, rotational bands, isospin mixing, two-level systems, α-particle clustering or exotic nuclear states (see [1][2][3][4][5] and references therein). This information is also of great interest to nuclear astrophysics where nuclear levels of particular structure often play a prominent role in big bang and/or in stellar nucleosyntheses (BBN, SN) [6][7][8].…”