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22 Ne( α , γ /n)

22 Ne( α , γ /n). 22 Ne( α ,n) 25 Mg reaction is the main source of neutrons for s-process - s-process is the origin of nuclides heavier than iron. We intend to conduct the direct reaction of 22 Ne( α ,n) 25 Mg .

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22 Ne( α , γ /n)

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  1. 22Ne(α,γ/n) • 22Ne(α,n)25Mg reaction is the main source of neutrons for s-process • - s-process is the origin of nuclides heavier than iron • We intend to conduct the direct reaction of 22Ne(α,n)25Mg • competition from 22Ne(α,γ)26Mg, so we need to measure the two rates • Coulomb barrier at low energy - which is where we have the most important contribution to reaction rates • Need to know the quantum numbers of the relevant resonances - Natural parity will be preferentially populated in 26Mg states • Data sets and evaluated reaction rates are considerably different from one another • - positions, widths and strengths of the resonances

  2. Some data sets

  3. Monte Carlo and Calc. (I)

  4. Monte Carlo and Calc. (II)

  5. Detector Configuration • Anti-coincidence (veto) configuration to suppress cosmic-ray-induced background • At least, we need four detectors, so that we can do angular distributions • - In order to get the Quantum number of the resonances • - DWBA calculations to constraint the spins

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