Active target studies of the α p -process at CRIB

D. Kahl, T. Hashimoto, N. N. Duy, S. Kubono, H. Yamaguchi, D. N. Binh, A. A. Chen, S. Cherubini, S. Hayakawa, J. J. He, H. Ishiyama, N. Iwasa, L. H. Khiem, Y. K. Kwon, S. Michimasa, T. Nakao, S. Ota, T. Teranishi, H. Tokieda, Y. WakabayashiT. Yamada, L. Y. Zhang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Citations (Scopus)


The αp-process is a sequence of (α, p)(p, γ) reactions important to the nuclear trajectory to higher masses in type I X-ray bursts. Specifically, the αp-process is schematically pure helium-burning, and thus unlike pure hydrogen-burning processes, does not require slow β+ decays. Explosive helium burning is responsible for the observed short rise-times of X-ray bursts but ultimately gives way to the rp-process as the Coulomb barrier increases. Because the stellar reaction rates of these (α, p) reactions are poorly known over the relevant astrophysical energies, we performed systematic studies of the 18Ne(α,p), 22Mg(α,p) and 30S(α,p) reactions at the Center for Nuclear Study (CNS) low-energy radioactive ion beam separator, called CRIB. We produce the radioactive beams in-flight and scan the center-of-mass energy down into the Gamow Window using a thick target in inverse kinematics. The helium target gas also serves as part of the detector system, an active target, which was newly designed for these measurements. The active target, which uses gas electron multiplier (GEM) foils, allows for higher beam injection rates than previous multi-sampling and tracking proportional counters (MSTPC). We present a summary of our recent results from these active target experiments at CRIB.

Original languageEnglish
Title of host publicationOrigin of Matter and Evolution of Galaxies 2013 - Proceedings of the 12th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG 2013
PublisherAmerican Institute of Physics Inc.
Number of pages8
ISBN (Print)9780735412286
Publication statusPublished - 2014
Event12th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG 2013 - Tsukuba, Japan
Duration: 2013 Nov 182013 Nov 21

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Other12th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG 2013


  • In-flight RIBs
  • X-ray bursts
  • active target
  • nuclear clusters
  • resonant scattering
  • rp-process
  • α p-process

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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