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$$E1$$ and $$E2$$ cross sections of the $$^{12}$$C($$alpha,gamma)^{16}$$O reaction at $$E_{cm} sim$$ 1.4 MeV using pulsed $$alpha$$ beams

Makii, Hiroyuki   ; Nagai, Yasuki; Mishima, Kenji*; Segawa, Mariko   ; Shima, Tatsushi*; Ueda, Hitoshi; Igashira, Masayuki*

The $$^{12}$$C($$alpha,gamma)^{16}$$O reaction plays an important role in stellar evolution at the stage of helium-burning. However, the cross section at low energy still has a large uncertainty mainly due to the poor determination of the $$sigma_{E2}/sigma_{E1}$$ ratio. We have installed a new system to measure the $$gamma$$-ray angular distribution of the $$^{12}$$C($$alpha,gamma)^{16}$$O reaction to accurately determine the $$sigma_{E1}$$ and $$sigma_{E2}$$. In this experiment, we used high efficiency anti-Compton NaI(Tl) spectrometers to detect a $$gamma$$-ray from the reaction with a large S/N ratio, intense pulsed $$alpha$$ beams to discriminate true events from neutron induced background with a time-of-flight method, and the monitoring system of target thickness. We succeeded in removing a background due to neutrons and could clearly detect the $$gamma$$-ray from the $$^{12}$$C($$alpha,gamma)^{16}$$O reaction with high statics.

Language

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English

Journal

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AIP Conference Proceedings 1016

Volume

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Number

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Pages

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p.215 - 220

Publication Year/Month

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2008/05

Meeting title

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10th International Symposium on Origin of Matter and Evolution of Galaxies (OMEG '07)

Held date

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2007/12

Location (city)

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Sapporo

Location (country)

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Japan

Patent information

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PDF

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Paper URL

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https://doi.org/10.1063/1.2943575

DOI for research data

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Keywords

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no keyword

Research Facility

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タンデム加速器  

Press Release

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Article of JAEA R&D Review

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Cooperating Institute

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Accesses

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- Accesses

InCites™

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Altmetrics

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