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 Thu Jul 18 22:10:58 2019, Jenn, e768s, OTHER, General, Fixed, , Previous Papers 
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 Sat Jul 20 11:33:01 2019, Christian, e768s, OTHER, General, Fixed, , Previous Papers - gamma decays from states in the 4-MeV region
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Sat Jul 20 12:06:00 2019, Christian, e768s, OTHER, General, Fixed, , Previous Papers - gamma decays from states in the 4-MeV region
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Sat Jul 20 12:57:41 2019, Christian, e768s, OTHER, General, Fixed, , Previous Papers - gamma decays from states in the 4-MeV region
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Sun Jul 21 17:57:08 2019, Christian, e768s, OTHER, General, Fixed, , Previous Papers - gamma decays from states in the 4-MeV region
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Mon Jul 22 10:10:02 2019, Christian, e768s, OTHER, General, Fixed, , Previous Papers - alpha-branching ratios for states in the 4-MeV region
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Thu Jul 25 11:05:18 2019, Francois de Oliveira, e768s, OTHER, General, Fixed, , Previous Papers - alpha-branching ratios for states in the 4-MeV region
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Message ID: 5190
Entry time: Sat Jul 20 12:57:41 2019
In reply to: 5189
Reply to this: 5223
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| Author: |
Christian |
| ExpNbr: |
e768s |
| Type: |
OTHER |
| Category: |
General |
| Status: |
Fixed |
| Target-Source: |
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| Subject: |
Previous Papers - gamma decays from states in the 4-MeV region |
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2019 paper by Hall, Bardayan, et al., gamma decays of 4.14 and 4.20 states, g-g-t triple coincidences.
Abstract:
The 15O(α,γ)19Ne reaction is responsible for breakout from the hot CNO cycle in Type I x-ray bursts. Understanding the properties of resonances between Ex = 4 and 5 MeV in 19Ne is crucial in the calculation of this reaction rate. The spins and parities of these states are well known, with the exception of the 4.14- and 4.20-MeV states, which have adopted spin-parities of 9/2− and 7/2−, re- spectively. Gamma-ray transitions from these states were studied using triton-γ-γ coincidences from the 19F(3He,tγ)19Ne reaction measured with GODDESS (Gammasphere ORRUBA Dual Detectors for Experimental Structure Studies) at Argonne National Laboratory. The observed transitions from the 4.14- and 4.20-MeV states provide strong evidence that the Jπ values are actually 7/2− and 9/2−, respectively. These assignments are consistent with the values in the 19F mirror nucleus and in contrast to previously accepted assignments.
Noteworthy is that they also don't observe the 3.96MeV transition from the 4.20MeV state, consistent with our observations.
No data is given on the 4.033 MeV state [potentially see further discussion in the corresponding PhD thesis].
From the data, however, it would seem that the (3He,t) reaction does not really populate the 4033 state [otherwise, the 4033 transition should have been seen in Figure 4]. |
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