17O(α,γ)21Ne and 17O(α,n)20Ne for the weak s process

被引：0

作者：

Best, A. ^{[1
]}

Goerres, J. ^{[1
]}

Beard, M. ^{[1
]}

Couder, M. ^{[1
]}

deBoer, R. ^{[1
]}

Falahat, S. ^{[1
,2
]}

Gueray, R. T. ^{[3
]}

Kontos, A. ^{[1
]}

Kratz, K-L ^{[2
]}

LeBlanc, P. J. ^{[1
]}

Li, Q. ^{[1
]}

O'Brien, S. ^{[1
]}

Oezkan, N. ^{[3
]}

Pignatari, M. ^{[4
]}

Sonnabend, K. ^{[5
]}

Talwar, R. ^{[1
]}

Tan, W. ^{[1
]}

Uberseder, E. ^{[1
]}

Wiescher, M. ^{[1
]}

机构：

[1] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA

[2] Kacaeli Univ, Dept Phys, D-55020 Mainz, Germany

[3] Kacaeli Univ, Dept Phys, TR-41380 Umuttepe, Turkey

[4] Univ Basel, Dept Phys, CH-4056 Basel, Switzerland

[5] Goethe Univ Frankfurt, Inst Appl Phys, D-60325 Frankfurt, Germany

来源：

EXOTIC NUCLEI AND NUCLEAR/PARTICLE ASTROPHYSICS (IV): FROM NUCLEI TO STARS | 2012年 / 1498卷

基金：

美国国家科学基金会;

关键词：

Helium burning; neutron poison; s process; R matrix; PROCESS NUCLEOSYNTHESIS; NE-21;

D O I：

10.1063/1.4768509

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The ratio of the reaction rates of the competing channels O-17(alpha,gamma)Ne-21 and O-17(alpha,n)Ne-20 determines the efficiency of O-16 as a neutron poison in the s process in low metallicity rotating stars. It has a large impact on the element production, either producing elements to the mass range of A=90 in case of a significant poisoning effect or extending the mass range up to the region of A=150 if the gamma channel is of negligible strength. We present an improved study of the reaction O-17(alpha, n)Ne-20, including an independent measurement of the O-17(alpha, n(1))Ne-20 channel. A simultaneous R-Matrix fit to both the n(0) and the n(1) channels has been performed. New reaction rates, including recent data on the O-17(alpha,gamma)Ne-21 reaction, have been calculated and used as input for stellar network calculations and their impact on the s process in rotating massive stars is discussed.

引用

页码：309 / 313

页数：5

共 50 条

[1] MEASUREMENT OF THE REACTIONS 17O(α,γ)21Ne AND 17O(α, n)20Ne AND THEIR IMPACT ON THE WEAK s PROCESS
Best, A.
Gorres, J.
Beard, M.
Couder, M.
Deboer, R.
Falahat, S.
Kontos, A.
Kratz, K. -L.
Leblanc, P. J.
Li, Q.
O'Brien, S.
Talwar, R.
Tan, W.
Uberseder, E.
Wiescher, M.
Guray, R. T.
Ozkan, N.
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CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS, 2013, : 320 - 325
[2] Constraints on key 17O(?,?) 21Ne resonances and impact on the weak s process
Williams, M.
Laird, A. M.
Choplin, A.
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Davids, B.
Greife, U.
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[3] Measurement of the reaction 17O(α,n)20Ne and its impact on the s process in massive stars
Best, A.
Beard, M.
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Falahat, S.
Guray, R. T.
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Kratz, K. -L.
LeBlanc, P. J.
Li, Q.
O'Brien, S.
Ozkan, N.
Pignatari, M.
Sonnabend, K.
Talwar, R.
Tan, W.
Uberseder, E.
Wiescher, M.
PHYSICAL REVIEW C, 2013, 87 (04):
[4] First direct measurement of resonance strengths in 17O(α, γ)21Ne
Best, A.
Goerres, J.
Couder, M.
deBoer, R.
Falahat, S.
Kontos, A.
LeBlanc, P. J.
Li, Q.
O'Brien, S.
Sonnabend, K.
Talwar, R.
Uberseder, E.
Wiescher, M.
PHYSICAL REVIEW C, 2011, 83 (05):
[5] 超核Λ17O,Λ21Ne的基态结合能
黄荣宪
孔令江
广西师范大学学报(自然科学版), 1991, (01) : 6 - 9
[6] Evidence for a-cluster structure in 21Ne in the first measurement of resonant 17O + α elastic scattering
Nurmukhanbetova, A. K.
Goldberg, V. Z.
Nauruzbayev, D. K.
Golovkov, M. S.
Volya, A.
PHYSICAL REVIEW C, 2019, 100 (06)
[7] A direct measurement of the 17O(α, γ)21Ne reaction in inverse kinematics and its impact on heavy element production
Taggart, M. P.
Akers, C.
Laird, A. M.
Hager, U.
Ruiz, C.
Hutcheon, D. A.
Bentley, M. A.
Brown, J. R.
Buchmann, L.
Chen, A. A.
Chen, J.
Chipps, K. A.
Choplin, A.
D'Auria, J. M.
Davids, B.
Davis, C.
Diget, C. Aa
Erikson, L.
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Frischknecht, U.
Fulton, B. R.
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Greife, U.
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Howell, D.
Martin, L.
Mountford, D.
Murphy, A. St J.
Ottewell, D.
Pignatari, M.
Reeve, S.
Ruprecht, G.
Sjue, S.
Veloce, L.
Williams, M.
PHYSICS LETTERS B, 2019, 798
[8] EXCITED STATES OF 21NE BY 20NE(D,P)21NE
LAMBERT, M
DUMAZET, G
BEAUMEVI.H
TELLEZ, A
YAKER, M
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1968, S 24 : 645 - +
[9] 20NE(D,P)21NE AND EXCITED STATES OF 21NE
LAMBERT, M
DUMAZET, G
BEAUMEVIEILLE, H
TELLEZ, A
MEYNADIER, C
MIDY, P
VANSEN, N
NUCLEAR PHYSICS A, 1968, A112 (01) : 161 - +
[10] Measurement of the cross section for the reaction 20Ne(n,α)17O in the neutron-energy between 4 and 7 MeV
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I. P. Bondarenko
B. D. Kuzminov
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