New measurement of the α asymptotic normalization coefficient of the 1/2+ state in 17O at 6.356 MeV that dominates the 13C(α, n)16O reaction rate at temperatures relevant for the s process

被引：35

作者：

Avila, M. L. ^{[1
]}

Rogachev, G. V. ^{[2
,3
]}

Koshchiy, E. ^{[2
,3
]}

Baby, L. T. ^{[1
]}

Belarge, J. ^{[1
]}

Kemper, K. W. ^{[1
]}

Kuchera, A. N. ^{[1
]}

Santiago-Gonzalez, D. ^{[1
]}

机构：

[1] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA

[2] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA

[3] Texas A&M Univ, Inst Cyclotron, College Stn, TX 77843 USA

来源：

PHYSICAL REVIEW C | 2015年 / 91卷 / 04期

基金：

美国国家科学基金会;

关键词：

STARS;

D O I：

10.1103/PhysRevC.91.048801

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Background: Accurate knowledge of the C-13(alpha, n)O-16 reaction cross section is important for the understanding of the s process in asymptotic giant branch stars, since it is considered to be the main source of neutrons. The subthreshold 1/2(+) state at excitation energy of 6.356 MeV in O-17 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 C-13(alpha, n)(16)Oreaction rate. Nevertheless, significant discrepancies between different measurements remain. Purpose: The aim of this work is to investigate these discrepancies. Method: An 8 MeV 13C beam (below the Coulomb barrier) was used to study the alpha-transfer reaction Li-6(C-13, d)O-17. Results: The squared Coulomb-modified asymptotic normalization coefficient of the 1/2+ state in 17O measured in this work is ((C) over tildeC(alpha-13C)(17O(1/2+)) = 3.6 +/- 0.7 fm(-1). Conclusions: Discrepancy between the results of a-transfer experiments have been resolved. However, some discrepancy with the most recent measurement using the Trojan Horse method remains.

引用

页数：4

共 18 条

[1] Constraining the 6.05 MeV 0+ and 6.13 MeV 3- Cascade Transitions in the 12C(α,γ)16O Reaction Using the Asymptotic Normalization Coefficients [J].

Avila, M. L. ;

Rogachev, G. V. ;

Koshchiy, E. ;

Baby, L. T. ;

Belarge, J. ;

Kemper, K. W. ;

Kuchera, A. N. ;

Mukhamedzhanov, A. M. ;

Santiago-Gonzalez, D. ;

Uberseder, E. .

PHYSICAL REVIEW LETTERS, 2015, 114 (07)

[2] α-cluster asymptotic normalization coefficients for nuclear astrophysics [J].

Avila, M. L. ;

Rogachev, G. V. ;

Koshchiy, E. ;

Baby, L. T. ;

Belarge, J. ;

Kemper, K. W. ;

Kuchera, A. N. ;

Santiago-Gonzalez, D. .

PHYSICAL REVIEW C, 2014, 90 (04)

[3]

Avila M. L., 2013, Clustering in 18O and ANC measurements using (6Li, d) reactions

[4] Sub-Coulomb α transfers on 12C and the 12C(α,γ)16O S factor [J].

Brune, CR ;

Geist, WH ;

Kavanagh, RW ;

Veal, KD .

PHYSICAL REVIEW LETTERS, 1999, 83 (20) :4025-4028

[5] ORIGIN OF ANOMALOUS ABUNDANCES OF THE ELEMENTS IN GIANT STARS [J].

CAMERON, AGW .

ASTROPHYSICAL JOURNAL, 1955, 121 (01) :144-160

[6] NEW DETERMINATION OF THE 13C(α, n)16O REACTION RATE AND ITS INFLUENCE ON THE s-PROCESS NUCLEOSYNTHESIS IN AGB STARS [J].

Guo, B. ;

Li, Z. H. ;

Lugaro, M. ;

Buntain, J. ;

Pang, D. Y. ;

Li, Y. J. ;

Su, J. ;

Yan, S. Q. ;

Bai, X. X. ;

Chen, Y. S. ;

Fan, Q. W. ;

Jin, S. J. ;

Karakas, A. I. ;

Li, E. T. ;

Li, Z. C. ;

Lian, G. ;

Liu, J. C. ;

Liu, X. ;

Shi, J. R. ;

Shu, N. C. ;

Wang, B. X. ;

Wang, Y. B. ;

Zeng, S. ;

Liu, W. P. .

ASTROPHYSICAL JOURNAL, 2012, 756 (02)

[7] The 13C(α, n) reaction and its role as a neutron source for the s process [J].

Heil, M. ;

Detwiler, R. ;

Azuma, R. E. ;

Couture, A. ;

Daly, J. ;

Goerres, J. ;

Kaeppeler, F. ;

Reifarth, R. ;

Tischhauser, P. ;

Ugalde, C. ;

Wiescher, M. .

PHYSICAL REVIEW C, 2008, 78 (02)

[8] ASYMPTOTIC GIANT BRANCH EVOLUTION AND BEYOND [J].

IBEN, I ;

RENZINI, A .

ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, 1983, 21 :271-342

[9] Astrophysical reaction rate for the neutron-generator reaction 13C(α,n)16O in asymptotic giant branch stars [J].

Johnson, E. D. ;

Rogachev, G. V. ;

Mukhamedzhanov, A. M. ;

Baby, L. T. ;

Brown, S. ;

Cluff, W. T. ;

Crisp, A. M. ;

Diffenderfer, E. ;

Goldberg, V. Z. ;

Green, B. W. ;

Hinners, T. ;

Hoffman, C. R. ;

Kemper, K. W. ;

Momotyuk, O. ;

Peplowski, P. ;

Pipidis, A. ;

Reynolds, R. ;

Roeder, B. T. .

PHYSICAL REVIEW LETTERS, 2006, 97 (19)

[10] DWBA analysis of the 13C(6Li, d)17O reaction at 10 MeV/nucleon and its astrophysical implications [J].

Keeley, N ;

Kemper, KW ;

Khoa, DT .

NUCLEAR PHYSICS A, 2003, 726 (1-2) :159-172

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