Study of proton resonances in 18Ne via resonant elastic scattering of 17F + p and its astrophysical implication in the stellar reaction of 14O(α, p)17F

被引：23

作者：

He, J. J. ^{[1
]}

Hu, J. ^{[1
,2
]}

Xu, S. W. ^{[1
]}

Chen, Z. Q. ^{[1
]}

Zhang, X. Y. ^{[1
]}

Wang, J. S. ^{[1
]}

Wang, H. W. ^{[3
]}

Tian, W. D. ^{[3
]}

Yu, X. Q. ^{[1
]}

Zhang, L. Y. ^{[1
,2
]}

Li, L. ^{[1
,2
]}

Yang, Y. Y. ^{[1
,2
]}

Ma, P. ^{[1
]}

Zhang, X. H. ^{[1
]}

Su, J. ^{[4
]}

Li, E. T. ^{[4
]}

Hu, Z. G. ^{[1
]}

Guo, Z. Y. ^{[1
]}

Xu, X. ^{[1
,2
]}

Yuan, X. H. ^{[1
]}

Lu, W. ^{[1
,2
]}

Yu, Y. H. ^{[1
]}

Zang, Y. D. ^{[1
,2
]}

Ye, S. W. ^{[1
,2
]}

Ye, R. P. ^{[1
,2
]}

Chen, J. D. ^{[1
,2
]}

Jin, S. L. ^{[1
,2
]}

Du, C. M. ^{[1
,2
]}

Wang, S. T. ^{[1
,2
]}

Ma, J. B. ^{[1
]}

Liu, L. X. ^{[1
,2
]}

Bai, Z. ^{[1
,2
]}

Li, X. Q. ^{[5
,6
]}

Lei, X. G. ^{[1
]}

Sun, Z. Y. ^{[1
]}

Zhang, Y. H. ^{[1
]}

Zhou, X. H. ^{[1
]}

Xu, H. S. ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China

[2] Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China

[3] Chinese Acad Sci, Shanghai Inst Appl Phys SINAP, Shanghai 201800, Peoples R China

[4] China Inst Atom Energy CIAE, Beijing 102413, Peoples R China

[5] Peking Univ, Sch Phys, Beijing 100871, Peoples R China

[6] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China

来源：

EUROPEAN PHYSICAL JOURNAL A | 2011年 / 47卷 / 05期

基金：

中国国家自然科学基金;

关键词：

SHORT-LIVED NUCLEI; STELLAR REACTIONS; NEUTRON-STARS; RP-PROCESS; ALPHA; O-14; NUCLEOSYNTHESIS; LANZHOU; BEAMS;

D O I：

10.1140/epja/i2011-11067-6

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：

The stellar O-14(alpha, p) F-17 reaction is thought to be one of the most important breakout reactions from the Hot CNO cycles into the rp-process in Type I X-ray bursters. In the present work, the properties of proton resonances in Ne-18 have been investigated efficiently by utilizing a technique of proton resonant elastic scattering with a F-17 radioactive-ion (RI) beam and a thick proton target. A 4.22MeV/nucleon F-17 RI beam, which was produced via a projectile-fragmentation reaction and experiencing a series of energy degradation, was separated by a Radioactive Ion Beam Line in Lanzhou (RIBLL) and bombarded a (CH2)(n) target. Energy spectra of the recoiled protons were measured by two sets of Delta E-E silicon telescope at center-of-mass scattering angles of theta(c.m.) approximate to 175 degrees +/- 5 degrees, theta(c.m.) approximate to 152 degrees +/- 8 degrees, respectively. Several proton resonances in Ne-18 were observed, and their resonant parameters have been determined by an R-matrix analysis of the differential cross-sections. A doublet structure around 7.10MeV has been identified and thought to be one state at 7.05MeV (2(+)) and another one at 7.12MeV (4(+)). The presently calculated total reaction rates of O-14(alpha, p) F-17 are, at least, a factor of 1.2 similar to 1.9 larger than the previous ones in a temperature region of 1.7 similar to 3.0 GK mainly owing to the contribution from the 7.05MeV (2(+)) state. This result implies that this breakout reaction may play a more important role than previously expected.

引用

页数：8

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