학술논문
Study of proton resonances in 18 Ne via resonant elastic scattering of 17 F + p and its astrophysical implication in the stellar reaction of 14 O(α, p)17 F
Document Type
Original Paper
Author
He, J. J.; Hu, J.; Xu, S. W.; Chen, Z. Q.; Zhang, X. Y.; Wang, J. S.; Wang, H. W.; Tian, W. D.; Yu, X. Q.; Zhang, L. Y.; Li, L.; Yang, Y. Y.; Ma, P.; Zhang, X. H.; Su, J.; Li, E. T.; Hu, Z. G.; Guo, Z. Y.; Xu, X.; Yuan, X. H.; Lu, W.; Yu, Y. H.; Zang, Y. D.; Ye, S. W.; Ye, R. P.; Chen, J. D.; Jin, S. L.; Du, C. M.; Wang, S. T.; Ma, J. B.; Liu, L. X.; Bai, Z.; Li, X. Q.; Lei, X. G.; Sun, Z. Y.; Zhang, Y. H.; Zhou, X. H.; Xu, H. S.
Source
The European Physical Journal A: Hadrons and Nuclei. May 2011 47(5):1-8
Subject
Language
English
ISSN
1434-6001
1434-601X
1434-601X
Abstract
The stellar 14 O (α, p) 17 F 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 18 Ne have been investigated efficiently by utilizing a technique of proton resonant elastic scattering with a 17 F radioactive-ion (RI) beam and a thick proton target. A 4.22 MeV/nucleon 17 F 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 ΔE-E silicon telescope at center-of-mass scattering angles of θc.m. ≈ 175° ± 5°, θc.m. ≈ 152° ± 8°, respectively. Several proton resonances in 18 Ne were observed, and their resonant parameters have been determined by an R-matrix analysis of the differential cross-sections. A doublet structure around 7.10 MeV has been identified and thought to be one state at 7.05 MeV (2+ ) and another one at 7.12 MeV (4+ ). The presently calculated total reaction rates of 14 O (α, p) 17 F are, at least, a factor of 1.2 ∼ 1.9 larger than the previous ones in a temperature region of 1.7 ∼ 3.0 GK mainly owing to the contribution from the 7.05 MeV (2+ ) state. This result implies that this breakout reaction may play a more important role than previously expected.