TY - JOUR
T1 - Studying the (α, p)-process in X-ray bursts using radioactive ion beams
AU - Deibel, Catherine M.
AU - Alcorta, Martin
AU - Bertone, Peter F.
AU - Clark, Jason A.
AU - Greene, John
AU - Hoffman, Calem R.
AU - Jiang, Cheng Lie
AU - Kay, Benjamin P.
AU - Lee, Hye Young
AU - Pardo, Richard C.
AU - Rehm, K. Ernst
AU - Rogers, Andrew
AU - Ugalde, Claudio
AU - Zinkann, Gary
AU - Bedoor, Shadi
AU - Shetty, Dinesh V.
AU - Wuosmaa, Alan H.
AU - Lighthall, Jonathan C.
AU - Marley, Scott T.
AU - Patel, Nidhi R.
AU - Figueira, Juan Manuel
AU - Paul, Michael
PY - 2010
Y1 - 2010
N2 - In type I X-Ray Bursts (XRBs) the nuclear flow is driven towards the proton-drip line by the triple-α reaction, the (α, p)-process, and the rp-process. Along the nucleosynthetic path, the reaction flow can be stopped at so-called waiting-point nuclei. The low Qpγ value of a waiting-point nucleus leads to (p; γ)-(γ, p) equilibrium causing the flow to stall and await a β decay. However, if the temperature is high enough the competing (α, p) reaction can bypass the waiting point. This can have significant effects on the final elemental abundances, energy output, and observables such as double-peaked luminosity profiles. In the intermediate mass region 22Mg, 26Si, 30S, and 34Ar have been identified as possible candidates for waiting-point nuclei in XRBs. A method to study the (α, p)-process on intermediate mass waiting-point nuclei has been developed whereby the time-inverse reaction is studied in inverse kinematics using radioactive ion beams produced by the in-flight method at the ATLAS facility at Argonne National Laboratory. The three reactions p(29P,26Si)a, p(33Cl, 30S)a, and p(37K,34Ar)a have been studied for the first time to determine cross sections for 26Si(α, p) 29P, 30S(α, p)33Cl, and 34Ar(α, p)37K, respectively. The results and future plans will be discussed.
AB - In type I X-Ray Bursts (XRBs) the nuclear flow is driven towards the proton-drip line by the triple-α reaction, the (α, p)-process, and the rp-process. Along the nucleosynthetic path, the reaction flow can be stopped at so-called waiting-point nuclei. The low Qpγ value of a waiting-point nucleus leads to (p; γ)-(γ, p) equilibrium causing the flow to stall and await a β decay. However, if the temperature is high enough the competing (α, p) reaction can bypass the waiting point. This can have significant effects on the final elemental abundances, energy output, and observables such as double-peaked luminosity profiles. In the intermediate mass region 22Mg, 26Si, 30S, and 34Ar have been identified as possible candidates for waiting-point nuclei in XRBs. A method to study the (α, p)-process on intermediate mass waiting-point nuclei has been developed whereby the time-inverse reaction is studied in inverse kinematics using radioactive ion beams produced by the in-flight method at the ATLAS facility at Argonne National Laboratory. The three reactions p(29P,26Si)a, p(33Cl, 30S)a, and p(37K,34Ar)a have been studied for the first time to determine cross sections for 26Si(α, p) 29P, 30S(α, p)33Cl, and 34Ar(α, p)37K, respectively. The results and future plans will be discussed.
UR - http://www.scopus.com/inward/record.url?scp=84887435196&partnerID=8YFLogxK
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AN - SCOPUS:84887435196
SN - 1824-8039
JO - Proceedings of Science
JF - Proceedings of Science
T2 - 11th Symposium on Nuclei in the Cosmos, NIC 2010
Y2 - 19 July 2010 through 23 July 2010
ER -