12C(15N, 14C)13N reaction at 81 MeV. Competition between one and two particle transfers

Rudchik, A.T.; Rudchik, A.A.; Kutsyk, O.E.; Kemper, K. W.; Rusek, K.; Piasecki, E.; Trzcińska, A.; Kliczewski, S.; Koshchy, E.I.; Pirnak, Val.M.; Ponkratenko, O. A.; Strojek, I.; Plujko, V. A.; Sakuta, S.B.; Siudak, R.; Ilyin, A.P.; Stepanenko, Yu.M.; Shyrma, Yu.O.; Uleshchenko, V.V.

doi:10.1016/j.nuclphysa.2019.121638

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…The cross-sections for populating the ground, 2 + 1 , and 0 + 2 states may be used for applications beyond measuring the E0 branching ratio of the Hoyle state. 13 N, as well as the mirror nucleus 13 C, have been discussed as a candidate for showing cluster states of the form 3α + p (3α + n) near their α thresholds [24][25][26][27]. The present experiments were conducted between 1.86-2.13 MeV above the 9 B+α threshold (9.495 MeV) in 13 N. Studies of other nuclei around 12 C have shown that R-matrix fits of crosssections around these energies can provide useful information on cluster configurations, e.g.…”

Section: Discussionmentioning

confidence: 99%

High precision proton angular distribution measurements of $^{12}$C(p,p') for determination of the $E0$ decay branching ratio of the Hoyle state

Cook,

Chevis,

Eriksen

et al. 2022

Preprint

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Background In stellar environments, carbon is produced exclusively via the 3α process, where three α particles fuse to form 12 C in the excited Hoyle state, which can then decay to the ground state. The rate of carbon production in stars depends on the radiative width of the Hoyle state. While not directly measurable, the radiative width can be deduced by combining three separately measured quantities, one of which is the E0 decay branching ratio. The E0 branching ratio can be measured by exciting the Hoyle state in the 12 C(p, p ) reaction and measuring the pair decay of both the Hoyle state and the first 2 + state of 12 C.Purpose To reduce the uncertainties in the carbon production rate in the universe by measuring a set of proton angular distributions for the population of the Hoyle state (0 + 2 ) and 2 + 1 state in 12 C in 12 C(p, p ) reactions between 10.20 and 10.70 MeV, used in the determination of the E0 branching ratio of the Hoyle state.Method Proton angular distributions populating the ground, first 2 + , and the Hoyle states in 12 C were measured in 12 C(p,p') reactions with a silicon detector array covering 22 • < θ < 158 • in 14 small energy steps between 10.20 and 10.70 MeV with a thin (60 µg/cm 2 ) nat C target.Results Total cross-sections for each state were extracted and the population ratio between the 2 + 1 and Hoyle state determined at each energy step. By appropriately averaging these cross-sections and taking their ratio, the equivalent population ratio can be extracted applicable for any thick 12 C target that may be used in pair-conversion measurements. This equivalent ratio agreed with a direct measurement performed with a thick target.Conclusions We present a general data set of high-precision 12 C(p, p ) cross-sections that make uncertainties resulting from the population of the 2 + 1 and 0 + 2 states by proton inelastic scattering negligible for any future measurements of the E0 branching ratio in 12 C. Implications for future measurements are discussed, as well as possible applications of this data set for investigating cluster structures in 13 N.

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Section: Discussionmentioning

confidence: 99%

High precision proton angular distribution measurements of $^{12}$C(p,p') for determination of the $E0$ decay branching ratio of the Hoyle state

Cook,

Chevis,

Eriksen

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…The cross sections for populating the ground, 2 + 1 , and 0 + 2 states may be used for applications beyond measuring the E 0 branching ratio of the Hoyle state. 13 N, as well as the mirror nucleus 13 C, have been discussed as a candidate for showing cluster states of the form 3α + p (3α + n) near their α thresholds [24][25][26][27]. The present experiments were conducted between 1.86 and 2.13 MeV above the 9 B +α threshold (9.495 MeV) in 13 N. Studies of other nuclei around 12 C have shown that R-matrix fits of cross sections near the α removal threshold can provide useful information on cluster configurations, e.g., [28,29].…”

Section: Discussionmentioning

confidence: 99%

High-precision proton angular distribution measurements of C12(p,p′) for the determination of the
Cook
¹
,
Chevis
²
,
Simpson
³

et al. 2021
Phys. Rev. C
4
0
4
0
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Background: In stellar environments, carbon is produced exclusively via the 3α process, where three α particles fuse to form 12 C in the excited Hoyle state, which can then decay to the ground state. The rate of carbon production in stars depends on the radiative width of the Hoyle state. While not directly measurable, the radiative width can be deduced by combining three separately measured quantities, one of which is the E 0 decay branching ratio. The E 0 branching ratio can be measured by exciting the Hoyle state in the 12 C(p, p ) reaction and measuring the pair decay of both the Hoyle state and the first 2 + state of 12 C. Purpose: We aim to reduce the uncertainties in the carbon production rate in the universe by measuring a set of proton angular distributions for the population of the Hoyle state (0 + 2 ) and 2 + 1 state in 12 C in 12 C(p, p ) reactions between 10.20 and 10.70 MeV, used in the determination of the E 0 branching ratio of the Hoyle state. Method: Proton angular distributions populating the ground, first 2 + , and the Hoyle states in 12 C were measured in 12 C(p, p ) reactions with a silicon detector array covering 22 • < θ < 158 • in 14 small energy steps between 10.20 and 10.70 MeV with a thin (60 μg/cm 2 ) nat C target. Results: Total cross sections for each state were extracted and the population ratio between the 2 + 1 and Hoyle state determined at each energy step. By appropriately averaging these cross sections and taking xtheir ratio, the equivalent population ratio can be extracted applicable for any thick 12 C target that may be used in pairconversion measurements. This equivalent ratio agreed with a direct measurement performed with a thick target. Conclusions: We present a general data set of high-precision 12 C(p, p ) cross sections that make uncertainties resulting from the population of the 2 + 1 and 0 + 2 states by proton inelastic scattering negligible for any future measurements of the E 0 branching ratio in 12 C. Implications for future measurements are discussed, as well as possible applications of this data set for investigating cluster structures in 13 N.

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12C(15N, 14C)13N reaction at 81 MeV. Competition between one and two particle transfers

Cited by 2 publications

References 11 publications

High precision proton angular distribution measurements of $^{12}$C(p,p') for determination of the $E0$ decay branching ratio of the Hoyle state

High precision proton angular distribution measurements of $^{12}$C(p,p') for determination of the $E0$ decay branching ratio of the Hoyle state

High-precision proton angular distribution measurements of C12(p,p′) for the determination of the
Cook
¹
,
Chevis
²
,
Simpson
³

et al. 2021
Phys. Rev. C
4
0
4
0
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12C(15N, 14C)13N reaction at 81 MeV. Competition between one and two particle transfers

Cited by 2 publications

References 11 publications

High precision proton angular distribution measurements of $^{12}$C(p,p') for determination of the $E0$ decay branching ratio of the Hoyle state

High precision proton angular distribution measurements of $^{12}$C(p,p') for determination of the $E0$ decay branching ratio of the Hoyle state

High-precision proton angular distribution measurements of C12(p,p′) for the determination of the Cook1, Chevis2, Simpson3 et al. 2021Phys. Rev. C4040View full textAdd to dashboardCite

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High-precision proton angular distribution measurements of C12(p,p′) for the determination of the
Cook
¹
,
Chevis
²
,
Simpson
³

et al. 2021
Phys. Rev. C
4
0
4
0
View full text Add to dashboard Cite