Helium burning: Carbon and oxygen formation studied with an optical readout TPC (O-TPC)

Gai, M.; collaboration, the Uconn-Yale-Duke-Weizmann-Ptb-Uc

doi:10.1088/1742-6596/202/1/012016

Cited by 5 publications

(3 citation statements)

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“…Another approach based on selection rules is to use the reaction 12 C(γ,3α). This approach is pursued by Gai et al at the HIgS facility [44,45]. The first results indicate a 2 + resonance close to that found by the scattering experiments.…”

Section: Pos(nic Xii)011mentioning

confidence: 90%

“…As an example, there has been focus on the production of 44 Ti in core collapse supernovae. γ-lines associated with 44 Ti decay have been detected by the INTEGRAL satellite from the supernova remnant Cassiopeia A [30], and explaining the mass fraction of 44 Ti produced could be a sensitive diagnostic of such events, however, this requires that the relevant production and destruction rates are sufficiently well known. Here, it turns out the 3α-process is among the most sensitive.…”

Section: α-Reaction At High Temperaturesmentioning

confidence: 99%

“…A question was asked by Lothar Buchmann as to how one could determine the radiative width of the 2 + resonance, which may influence and dominate the reaction rate at high temperatures. One option would be the approach mentioned above using the reaction 12 C(γ,3α) [44,45]. This…”

Section: Questionsmentioning

confidence: 99%

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New experimental results for the triple-alpha reaction

Fynbo¹

2013

Proceedings of XII International Symposium on Nuclei in the Cosmos — PoS(NIC XII)

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The triple-alpha reaction is one of the key reactions in nuclear astrophysics. The reaction rate is primarily needed at temperatures of some 10 8 K typical for Helium burning in red giant stars, but the rate at very low and very high temperatures is also needed for various specialized applications. Here we discuss new experimental results relevant for determining the rate of the 3α reaction. First, we present a new improved upper limit for direct α-decay of the Hoyle state, which effectively removes this issue from the error budget of the reaction rate at Helium burning temperatures. We use the reaction 11 B(3 He,d)3α to populate the Hoyle state, and measure its decay in complete kinematics. Second, we present a new method for studying broad resonances in 12 C. We populate a resonance above the region of interest and select γ-decays of this resonance to lower lying resonances. The γ-decay is identified by measuring the final state in complete kinematics, which makes it possible to identify γ-decay to broad resonances, which is otherwise very difficult due to either background from overlapping states with different spin-parity, or due to the response of conventional gamma-detectors. By choosing the first resonance appropriately one can enhance the selectivity for each state of interest by using the selection rules of γ-decay. Our first case using this method is a search for the first 2 + resonance in 12 C, which has been the object of countless studies throughout the years. We will present clear evidence for a 2 + resonance near 11-12 MeV and tentative evidence also for a resonance at 9-10 MeV. These resonances will enhance the 3α-reaction rate at elevated temperatures.

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Section: Pos(nic Xii)011mentioning

confidence: 90%