التفاصيل البيبلوغرافية
| العنوان: |
Nuclear Astrophysics at ISAC with DRAGON: Initial Studies. |
| المؤلفون: |
Olin, Art, Bishop, Shawn, Buchmann, Lothar, Chatterjee, Mohan L., Chen, Alan, D’Auria, John M., Engel, Sabine, Gigliotti, Dario, Greife, Uwe, Hunter, Don, Hussein, Ahmed, Hutcheon, Dave, Jewett, Cybele, King, Jim, Kubono, Shigeru, Lamey, Michael, Laird, Alison M., Lewis, Rachel, Liu, Wenjie, Michimasa, Shin'ichiro |
| المصدر: |
AIP Conference Proceedings; 2002, Vol. 637 Issue 1, p119, 5p |
| مصطلحات موضوعية: |
NUCLEAR astrophysics, NUCLEAR research laboratories |
| مستخلص: |
The new DRAGON recoil separator facility, designed and built to measure directly the rates of radiative proton and alpha capture reactions important for nuclear astrophysics, is now in operation at the TRIUMF-ISAC radioactive beams facility in Vancouver, Canada. Experiments have been conducted for the first time on the [sup 21]Na(p,γ)[sup 22]Mg reaction. The evolution of nova explosions, and particularly their [sup 22]Na abundance, depends sensitively on this reaction rate. The radioactive [sup 21]Na beam with an intensity of up to 5 × 10[sup 8]/s was directed onto a windowless hydrogen gas target ( 3.8 × 10[sup 18] H atoms/cm²). Prompt reaction gamma rays were detected using a BGO array and separated reaction products detected using a silicon strip detector at the end of the 20.8 m recoil mass separator. Yield measurements recording simultaneously singles and coincident signals were performed by scanning in energy over the known resonance reported previously in [sup 22]Mg at E[sub cm] = 212 keV, and in addition, over a strong resonance observed at E[sub cm] ≈ 822 keV. Known resonances in the [sup 21]Ne(p, γ [sup 22]Na, [sup 20]Ne(p,γ) [sup 21]Na, and [sup 24]Mg(p,γ[sup )25] A1 reactions have been used to calibrate the DRAGON. Studies are in progress to further define the performance of the DRAGON facility. Status of the data analysis and results from system performance studies will be presented along with a brief description of the new ISAC and DRAGON facilities. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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