<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>α</mml:mi></mml:math>-cluster asymptotic normalization coefficients for nuclear astrophysics

Avila, M. L.; Rogachev, G. V.; Koshchiy, E.; Baby, L. T.; Belarge, J.; Kemper, K. W.; Kuchera, A. N.; Santiago-Gonzalez, D.

doi:10.1103/physrevc.90.042801

Cited by 16 publications

(38 citation statements)

References 13 publications

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“…We expect that the new, small uncertainty for the 1/2 + at 6.356 MeV ANC value and also the new 13 C+α elastic scattering data [18] at low energies will provide reliable reaction rate constraints that will be adequate for modern models of AGB stars. While this result does not eliminate the need for direct measurements of the 13 C(α, n) 16 O reaction cross section at as low an energy as possible, it reduces the nuclear physics uncertainties of the s-process dramatically.…”

Section: Resultsmentioning

confidence: 99%

“…In this figure an intense proton region is observed at around 1.8 MeV. This proton background corresponds to 13 C+p elastic scattering due to hydrogen contained in the target. In Fig.…”

Section: Experimental Setup and Analysismentioning

confidence: 93%

“…Details are given in Refs. [12,14]. After the energy correction due to the energy loss in the buildup material in the target, an effective energy of interaction of 7.72 MeV was calculated by taking into account the energy dependence of the cross section.…”

Section: Experimental Setup and Analysismentioning

confidence: 99%

“…The application of the sub-Coulomb α-transfer ANC technique was pioneered in Ref. [11], where the α-transfer 16 O, were constrained using this approach [13].…”

Section: Introductionmentioning

confidence: 99%

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New measurement of theαasymptotic normalization coefficient of the1/2+state inO
Avila
¹
,
Rogachev
²
,
Koshchiy
³

et al. 2015
Phys. Rev. C
Self Cite
34
6
37
1
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Background: Accurate knowledge of the 13 C(α,n) 16 O reaction cross section is important for the understanding of the s-process in AGB stars, since it is considered to be the main source of neutrons. The sub-threshold 1/2 + state at excitation energy of 6.356 MeV in 17 O has a strong influence on the reaction cross section at energies relevant for astrophysics. Several experiments have been performed to determine the contribution of this state to the 13 C(α, n) 16 O reaction rate. Nevertheless, significant discrepancies between different measurements remain.Purpose: The aim of this work is to investigate these discrepancies.Method: An 8 MeV 13 C beam (below the Coulomb barrier) was used to study the α-transfer However, some discrepancy with the most recent measurement using the Trojan Horse method remains.

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Section: Resultsmentioning

confidence: 99%

“…In this figure an intense proton region is observed at around 1.8 MeV. This proton background corresponds to 13 C+p elastic scattering due to hydrogen contained in the target. In Fig.…”

Section: Experimental Setup and Analysismentioning

confidence: 93%

Section: Experimental Setup and Analysismentioning

confidence: 99%

“…The application of the sub-Coulomb α-transfer ANC technique was pioneered in Ref. [11], where the α-transfer 16 O, were constrained using this approach [13].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

New measurement of theαasymptotic normalization coefficient of the1/2+state inO
Avila
¹
,
Rogachev
²
,
Koshchiy
³

et al. 2015
Phys. Rev. C
Self Cite
34
6
37
1
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show abstract

“…In order to define an absolute and unique value for the 13 C(α, n) 16 O data, we combined the recent and precise ANC calculation (3.6±0.7 fm −1 by [9]) and the full width for the threshold resonance (136 keV in [10]) from literature into a HOES R-matrix fit of the THM data [4] (see red curves and full symbols, respectively, in the left panel of Fig. 1).…”

Section: New Normalization Procedures From Indirect To Direct Datamentioning

confidence: 99%

Determining the ¹³C(α, n)¹⁶O absolute cross section through the concurrent application of ANC and THM and astrophysical consequences for the s-process in AGB-LMSs.

Trippella

Cognata

2017

EPJ Web Conf.

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Abstract. The 13 C(α, n) 16 O reaction is considered to be the most important neutron source for the s-process main component in low-mass asymptotic giant branch stars. No direct experimental data exist at very low energies and measurements performed through direct techniques show inconsistent results, mostly in their absolute values. In this context, we reversed the usual normalization procedure combining two indirect approaches, the asymptotic normalization coefficient and the Trojan Horse Method, to unambiguously determine the absolute value of the 13 C(α, n) 16 O astrophysical S (E)-factor in the most relevant energy-region for astrophysics. Adopting the new reaction rate for the n-source in the NEWTON s-process nucleosynthesis code, astrophysical calculations show only limited variations, less than 1%, for those nuclei whose production is considered to be totally due to slow neutron captures.

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Introduction of the new LUNA experimental setup for high precision measurement of the¹³C(α,n)¹⁶O reaction for astrophysical purposes

et al. 2017

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Abstract.The 13 C(α,n) 16 O reaction is the prevalent neutron source for the main s-process. The direct measurement of this reaction at stellar temperature (kT=8 keV) has so far not been possible due to the very low cross section at the corresponding energy. The extrapolation of the astrophysical S-factor of this reaction into the Gamow window (E α,c.m. =140-230 keV) is complicated by the large uncertainties of the lowenergy experimental data and the existence of a state of 17 O near the α-threshold that can have a large effect on low energy cross section. The aim of this paper is to introduce the new LUNA experimental setup, dedicated to the investigation of 13 C(α,n) 16 O reaction below E α,lab =400 keV.

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α-cluster asymptotic normalization coefficients for nuclear astrophysics

Abstract: Background: Many important α-particle induced reactions for nuclear astrophysics may only be

Cited by 16 publications

References 13 publications

New measurement of theαasymptotic normalization coefficient of the1/2+state inO
Avila
¹
,
Rogachev
²
,
Koshchiy
³

et al. 2015
Phys. Rev. C
Self Cite
34
6
37
1
View full text Add to dashboard Cite

New measurement of theαasymptotic normalization coefficient of the1/2+state inO
Avila
¹
,
Rogachev
²
,
Koshchiy
³

et al. 2015
Phys. Rev. C
Self Cite
34
6
37
1
View full text Add to dashboard Cite

Determining the ¹³C(α, n)¹⁶O absolute cross section through the concurrent application of ANC and THM and astrophysical consequences for the s-process in AGB-LMSs.

Introduction of the new LUNA experimental setup for high precision measurement of the¹³C(α,n)¹⁶O reaction for astrophysical purposes

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α-cluster asymptotic normalization coefficients for nuclear astrophysics

Abstract: Background: Many important α-particle induced reactions for nuclear astrophysics may only be

Cited by 16 publications

References 13 publications

New measurement of theαasymptotic normalization coefficient of the1/2+state inOAvila1, Rogachev2, Koshchiy3 et al. 2015Phys. Rev. CSelf Cite346371View full textAdd to dashboardCite

New measurement of theαasymptotic normalization coefficient of the1/2+state inOAvila1, Rogachev2, Koshchiy3 et al. 2015Phys. Rev. CSelf Cite346371View full textAdd to dashboardCite

Determining the 13C(α, n)16O absolute cross section through the concurrent application of ANC and THM and astrophysical consequences for the s-process in AGB-LMSs.

Introduction of the new LUNA experimental setup for high precision measurement of the13C(α,n)16O reaction for astrophysical purposes

Contact Info

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Resources

About

New measurement of theαasymptotic normalization coefficient of the1/2+state inO
Avila
¹
,
Rogachev
²
,
Koshchiy
³

et al. 2015
Phys. Rev. C
Self Cite
34
6
37
1
View full text Add to dashboard Cite

New measurement of theαasymptotic normalization coefficient of the1/2+state inO
Avila
¹
,
Rogachev
²
,
Koshchiy
³

et al. 2015
Phys. Rev. C
Self Cite
34
6
37
1
View full text Add to dashboard Cite

Determining the ¹³C(α, n)¹⁶O absolute cross section through the concurrent application of ANC and THM and astrophysical consequences for the s-process in AGB-LMSs.

Introduction of the new LUNA experimental setup for high precision measurement of the¹³C(α,n)¹⁶O reaction for astrophysical purposes