The radiative capture reaction View the MathML source has been investigated in the energy range E=3.3 to 4.5 MeV. This experiment focused in particular on the cascade transition to the 0+ state at Ex=6.05 MeV in 16O and was performed by detecting the capture γ-rays with a NaI detector array at the windowless 4He gas target of the recoil mass separator ERNA in coincidence with the 16O ejectiles. The 6.05 MeV transition has been considered recently as a component accounting for up to 15% of the View the MathML source total cross section at astrophysical energies. The arrangement of the detector array yielded additional information on the γ-ray multipolarity, i.e. the ratio σE2/σE1, and it was found that the 6.05 MeV transition is entirely E2 in the studied energy range. The results for this transition are analyzed in an R-matrix formalism and extrapolated to the relevant Gamow energy of stellar helium burning, E0≃300 keV. In contrast to a previous analysis, the present extrapolation suggests a negligible contribution from this amplitude, View the MathML source. Additional data for cascade transitions to excited states at Ex=6.13, 6.92, and 7.12 MeV, respectively, as well as to the ground state were obtained and the corresponding S factors in the studied energy range are given.

Study of the 6.05 MeV cascade transition in 12C(α,γ)16O / D., Schürmann; DI LEVA, Antonino; L., Gialanella; R., Kunz; F., Strieder; N., De Cesare; M., De Cesare; A., Dʼonofrio; K., Fortak; Imbriani, Gianluca; D., Rogalla; Romano, Mario; F., Terrasi. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 703:(2011), pp. 557-561. [10.1016/j.physletb.2011.08.061]

Study of the 6.05 MeV cascade transition in 12C(α,γ)16O

DI LEVA, ANTONINO;IMBRIANI, GIANLUCA;ROMANO, MARIO;
2011

Abstract

The radiative capture reaction View the MathML source has been investigated in the energy range E=3.3 to 4.5 MeV. This experiment focused in particular on the cascade transition to the 0+ state at Ex=6.05 MeV in 16O and was performed by detecting the capture γ-rays with a NaI detector array at the windowless 4He gas target of the recoil mass separator ERNA in coincidence with the 16O ejectiles. The 6.05 MeV transition has been considered recently as a component accounting for up to 15% of the View the MathML source total cross section at astrophysical energies. The arrangement of the detector array yielded additional information on the γ-ray multipolarity, i.e. the ratio σE2/σE1, and it was found that the 6.05 MeV transition is entirely E2 in the studied energy range. The results for this transition are analyzed in an R-matrix formalism and extrapolated to the relevant Gamow energy of stellar helium burning, E0≃300 keV. In contrast to a previous analysis, the present extrapolation suggests a negligible contribution from this amplitude, View the MathML source. Additional data for cascade transitions to excited states at Ex=6.13, 6.92, and 7.12 MeV, respectively, as well as to the ground state were obtained and the corresponding S factors in the studied energy range are given.
2011
Study of the 6.05 MeV cascade transition in 12C(α,γ)16O / D., Schürmann; DI LEVA, Antonino; L., Gialanella; R., Kunz; F., Strieder; N., De Cesare; M., De Cesare; A., Dʼonofrio; K., Fortak; Imbriani, Gianluca; D., Rogalla; Romano, Mario; F., Terrasi. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 703:(2011), pp. 557-561. [10.1016/j.physletb.2011.08.061]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/412692
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