First measurement of S-30 + alpha resonant elastic scattering for the S-30(alpha, p) reaction rate
- Authors
- Kahl, D.; Yamaguchi, H.; Kubono, S.; Chen, A. A.; Parikh, A.; Binh, D. N.; Chen, J.; Cherubini, S.; Duy, N. N.; Hashimoto, T.; Hayakawa, S.; Iwasa, N.; Jung, H. S.; Kato, S.; Kwon, Y. K.; Nishimura, S.; Ota, S.; Setoodehnia, K.; Teranishi, T.; Tokieda, H.; Yamada, T.; Yun, C. C.; Zhang, L. Y.
- Issue Date
- Jan-2018
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW C, v.97, no.1
- Journal Title
- PHYSICAL REVIEW C
- Volume
- 97
- Number
- 1
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/45365
- DOI
- 10.1103/PhysRevC.97.015802
- ISSN
- 2469-9985
2469-9993
- Abstract
- Background: Type I x-ray bursts are the most frequently observed thermonuclear explosions in the galaxy, resulting from thermonuclear runaway on the surface of an accreting neutron star. The S-30(alpha, p) reaction plays a critical role in burst models, yet insufficient experimental information is available to calculate a reliable, precise rate for this reaction. Purpose: Our measurement was conducted to search for states in Ar-34 and determine their quantum properties. In particular, natural-parity states with large alpha-decay partial widths should dominate the stellar reaction rate. Method: We performed the firstmeasurement of S-30 + alpha resonant elastic scattering up to a center-of-mass energy of 5.5 MeV using a radioactive ion beam. The experiment utilized a thick gaseous active target system and silicon detector array in inverse kinematics. Results: We obtained an excitation function for S-30(alpha,alpha) near 150 degrees. in the center-of-mass frame. The experimental data were analyzed with R-matrix calculations, and we observed three new resonant patterns between 11.1 and 12.1 MeV, extracting their properties of resonance energy, widths, spin, and parity. Conclusions: We calculated the resonant thermonuclear reaction rate of 30S(alpha, p) based on all available experimental data of Ar-34 and found an upper limit about one order of magnitude larger than a rate determined using a statistical model. The astrophysical impact of these two rates has been investigated through one-zone postprocessing type I x-ray burst calculations. We find that our new upper limit for the S-30(alpha, p)Cl-33 rate significantly affects the predicted nuclear energy generation rate during the burst.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Natural Sciences > Department of Physics > 1. Journal Articles
![qrcode](https://api.qrserver.com/v1/create-qr-code/?size=55x55&data=https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/45365)
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.