Abstract
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 language | English |
|---|---|
| Title of host publication | Origin of Matter and Evolution of Galaxies 2013 - Proceedings of the 12th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG 2013 |
| Publisher | American Institute of Physics Inc. |
| Pages | 163-170 |
| Number of pages | 8 |
| ISBN (Print) | 9780735412286 |
| DOIs | |
| Publication status | Published - Jan 1 2014 |
| Event | 12th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG 2013 - Tsukuba, Japan Duration: Nov 18 2013 → Nov 21 2013 |
Publication series
| Name | AIP Conference Proceedings |
|---|---|
| Volume | 1594 |
| ISSN (Print) | 0094-243X |
| ISSN (Electronic) | 1551-7616 |
Other
| Other | 12th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG 2013 |
|---|---|
| Country | Japan |
| City | Tsukuba |
| Period | 11/18/13 → 11/21/13 |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
Cite this
Active target studies of the α p -process at CRIB. / Kahl, D.; Hashimoto, T.; Duy, N. N.; Kubono, S.; Yamaguchi, H.; Binh, D. N.; Chen, A. A.; Cherubini, S.; Hayakawa, S.; He, J. J.; Ishiyama, H.; Iwasa, N.; Khiem, L. H.; Kwon, Y. K.; Michimasa, S.; Nakao, T.; Ota, S.; Teranishi, T.; Tokieda, H.; Wakabayashi, Y.; Yamada, T.; Zhang, L. Y.
Origin of Matter and Evolution of Galaxies 2013 - Proceedings of the 12th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG 2013. American Institute of Physics Inc., 2014. p. 163-170 (AIP Conference Proceedings; Vol. 1594).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
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TY - GEN
T1 - Active target studies of the α p -process at CRIB
AU - Kahl, D.
AU - Hashimoto, T.
AU - Duy, N. N.
AU - Kubono, S.
AU - Yamaguchi, H.
AU - Binh, D. N.
AU - Chen, A. A.
AU - Cherubini, S.
AU - Hayakawa, S.
AU - He, J. J.
AU - Ishiyama, H.
AU - Iwasa, N.
AU - Khiem, L. H.
AU - Kwon, Y. K.
AU - Michimasa, S.
AU - Nakao, T.
AU - Ota, S.
AU - Teranishi, T.
AU - Tokieda, H.
AU - Wakabayashi, Y.
AU - Yamada, T.
AU - Zhang, L. Y.
PY - 2014/1/1
Y1 - 2014/1/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84903200159&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84903200159&partnerID=8YFLogxK
U2 - 10.1063/1.4874062
DO - 10.1063/1.4874062
M3 - Conference contribution
AN - SCOPUS:84903200159
SN - 9780735412286
T3 - AIP Conference Proceedings
SP - 163
EP - 170
BT - Origin of Matter and Evolution of Galaxies 2013 - Proceedings of the 12th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG 2013
PB - American Institute of Physics Inc.
ER -