The study of the reduced α-width and ANC of 16O states through its sequential breakup

Adhikari, S.; Basu, Chinmay

doi:10.1016/j.physletb.2009.11.009

Cited by 17 publications

(16 citation statements)

References 44 publications

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“…A typical value of the ANC using the effective range expansion is |C b | ≃ 2 × 10 4 fm −1/2 . It is significantly smaller than those obtained from the α-transfer reactions, |C b | = (1.14 ∼ 1.82) × 10 5 fm −1/2 [16,17,18,19], and those from other theoretical calculations; e.g., Sparenberg obtained |C b | = 1.445 × 10 5 fm −1/2 from phase-equivalent super-symmetric potentials [20], and Dufour and Descouvemont did |C b | = 1.26 × 10 5 fm −1/2 from generator coordinate method [21]. The difference of the ANC values will be consequential in an estimate of the E2 transition of 12 C(α,γ) 16 O at E G .…”

Section: Introductionmentioning

confidence: 57%

Elastic α−C12 scattering at low energies with the sharp resonant 03+ state of
Ando
¹

2020
Phys. Rev. C

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The elastic α-12 C scattering for l = 2 at low energies is studied in effective Lagrangian approach. We explicitly include two resonant 2 + 2 and 2 + 3 states of 16 O in the scattering amplitude and fit the parameters to the phase shift data. We also study three contributions from higher order, the resonant 2 + 1 state of 12 C, the resonant 2 + 4 state of 16 O, and a vertex correction of the initial and final state interactions of the amplitude for the 2 + 3 state of 16 O, by imposing three conditions at the very low energies where the phase shift data are not available, and calculate the asymptotic normalization coefficient (ANC) for the sub-threshold 2 + 1 state of 16 O. We find that the previously reported small and large values of the ANC can be reproduced depending on the imposed conditions, but we obtain a large error bar to the large ANC value reported from the α transfer reactions.

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Section: Introductionmentioning

confidence: 57%

Elastic α−C12 scattering at low energies with the sharp resonant 03+ state of
Ando
¹

2020
Phys. Rev. C

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“…This is about five orders of magni-41 tude below the sensitivity achieved by the most advanced is substantially larger than those determined by the precise sub-Coulomb transfer reactions [12,13]. Currently, reported experimental values of the GS ANC range from 13.9 ± 2.4 fm −1/2 to 3390 fm −1/2 [11,[14][15][16]. In light of this large discrepancy between GS ANC values and the consistent values for the 2 + ANC determined through sub-Coulomb transfer reactions, a value of 58 fm −1/2 for the GS ANC was adopted in that work [3].…”

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confidence: 89%

“…Four independent investigations, in addition to the present work, have been performed previously to study the GS ANC. Adhikari and Basu[14] found a very small ANC of 13.9 ± 2.4 fm −1/2 by analyzing the O 16 breakup on 208 Pb. Subsequently, they updated the GS ANC to be 637 ± 86 fm −1/2 via the 12 C( 7 Li, t)16 O reaction us-TABLE I.…”

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confidence: 99%

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Constraining the External Capture to the O16 Ground State and the E2
Shen
¹
,
deBoer
²
,
Li
³

et al. 2020
Phys. Rev. Lett.

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The 12 C(α, γ) 16 O reaction is one of the most crucial reactions in nuclear astrophysics. The E2 external capture to the O 16 ground state (GS) has not been emphasized in previous analyses but may make a significant contribution to the 12 C(α, γ) 16 O cross section depending on the value of the GS asymptotic normalization coefficient (ANC). In the present work, we determine this ANC to be 337±45 fm −1/2 through the 12 C( 11 B, 7 Li) 16 O reaction using a high-precision magnetic spectrograph. This sheds light on the existing large discrepancy of more than two orders of magnitude between the previously reported ANC values. Based on the new ANC, we experimentally constrain the GS external capture and show that through interference with the high energy tail of the 2 + subthreshold state, a substantial enhancement in the GS SE2(300) factor can be obtained (70±7 keV b) compared to that of a recent review (45 keV b), resulting in an increase of the total S-factor from 140 keV b to 162 keV b, which is now in good agreement with the value obtained by reproducing supernova nucleosynthesis calculations with the solar-system abundances. This work emphasizes that the external capture contribution for the ground state transition cannot be neglected in future analyses of the 12 C(α, γ) 16 O reaction.

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“…In addition to ( 6 Li, d), ( 7 Li, t) and ( 11 B, 7 Li), other transfer systems, such as ( 16 O, 12 C) and ( 20 Ne, 16 O), also have potential for investigating α-cluster structure and α induced reactions of astrophysical interest. To date the ANC of the 16 O GS has been extensively investigated.…”

Section: Experimental Techniquesmentioning

confidence: 99%

An indirect technique in nuclear astrophysics: alpha-cluster transfer reaction

Shen

Liu

2022

EPJ Web Conf.

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Helium(4He, or α)is the second most abundant element in the observable Universe. The α-particle induced reactions such as(α, γ), (α, n) and (α, p) play a crucial role in nuclear astrophysics, especially for understanding stellar heliumburning. Because of the strong Coulomb repulsion, it is greatly hindered to directly measure the cross sections for these α-capture reactions at stellar energies. Alpha-cluster transfer reaction is a powerful tool for investigation of astrophysical(α, γ), (α, n)and(α, p)reactions since it can preferentially populate the natural-parity states with an α-cluster structure which dominantly contribute to these astrophysical α-capture reactions during stellar heliumburning. In this paper, we reviewthe theoretical scheme, theexperimental technique, astrophysical applications and the future perspectives of such approach based on α-cluster transfer reactions.

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The study of the reduced α-width and ANC of 16O states through its sequential breakup

Cited by 17 publications

References 44 publications

Elastic α−C12 scattering at low energies with the sharp resonant 03+ state of
Ando
¹

2020
Phys. Rev. C

Elastic α−C12 scattering at low energies with the sharp resonant 03+ state of
Ando
¹

2020
Phys. Rev. C

Constraining the External Capture to the O16 Ground State and the E2
Shen
¹
,
deBoer
²
,
Li
³

et al. 2020
Phys. Rev. Lett.

An indirect technique in nuclear astrophysics: alpha-cluster transfer reaction

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The study of the reduced α-width and ANC of 16O states through its sequential breakup

Cited by 17 publications

References 44 publications

Elastic α−C12 scattering at low energies with the sharp resonant 03+ state of Ando1 2020Phys. Rev. C

Elastic α−C12 scattering at low energies with the sharp resonant 03+ state of Ando1 2020Phys. Rev. C

Constraining the External Capture to the O16 Ground State and the E2 Shen1, deBoer2, Li3 et al. 2020Phys. Rev. Lett.

An indirect technique in nuclear astrophysics: alpha-cluster transfer reaction

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Product

Resources

About

Elastic α−C12 scattering at low energies with the sharp resonant 03+ state of
Ando
¹

2020
Phys. Rev. C

Elastic α−C12 scattering at low energies with the sharp resonant 03+ state of
Ando
¹

2020
Phys. Rev. C

Constraining the External Capture to the O16 Ground State and the E2
Shen
¹
,
deBoer
²
,
Li
³

et al. 2020
Phys. Rev. Lett.