Populating α-unbound states in 16 O via 19 F ( p , α y ) 16 O reaction

• Published in: EPJ Web of conferences Vol. 290; p. 3003
• Main Authors: Távora, V.G., Tengblad, O., Borge, M.J.G., Briz, J.A., Fernandez Ruiz, D., Jensen, E.A.M., Nerio, A.N., Perea, A.
• Format: Journal Article
• Language: English
• Published: 2023
• ISSN: 2100-014X; 2100-014X
• DOI: 10.1051/epjconf/202329003003

The
12
C
(α, y)
16
O
reaction is important in the production of universal
16
O
, but its cross-section at the relevant energies of static helium burning is complex and uncertain. The total cross-section originates from a sum of resonance tails and direct captures, making the contributions of sub-threshold states difficult to estimate. One proposed method to estimate these contributions involves determining relevant reduced α-widths of the sub-threshold states through indirect measurements. Therefore,
19
F
(
p
, α
y
)
16
O
reaction was used to populate α-unbound states in
16
O
using a 2.6 MeV proton beam on a
CaF
2
target. A detection system consisting of single and telescope configurations of Si detectors was used to detect 2α-particles and a
12
C
particle in coincidence. Scintillator detectors were included in the setup to study the de-excitation of the states populated in
16
O
to the ground state. Under good event conditions a preliminar indentification of the particles detected has been conducted.