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Becchetti, F. D.; Fields, Chris; Raymond, R. S.; Bhang, H.; Overway, D.

doi:10.1103/physrevc.24.2401

Cited by 9 publications

(4 citation statements)

References 20 publications

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“…The upper limit on DDÈ is 1 order of magnitude better than the previous upper limit of 0.04 obtained by Freer et al We note that the ghost of the 8 Be ground state [31][32][33][34] only contributes at the level of 6 Â 10 À5 , which is below the present sensitivity.…”

contrasting

confidence: 67%

Improved Limit on DirectαDecay of the Hoyle State

et al. 2012

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The current evaluation of the triple-reaction rate assumes that the decay of the 7.65 MeV, 0 þ state in 12 C, commonly known as the Hoyle state, proceeds sequentially via the ground state of 8 Be. This assumption is challenged by the recent identification of two direct -decay branches with a combined branching ratio of 17ð5Þ%. If correct, this would imply a corresponding reduction in the triple-reaction rate with important astrophysical consequences. We have used the 11 Bð 3 He; dÞ reaction to populate the Hoyle state and measured the decay to three particles in complete kinematics. We find no evidence for direct -decay branches, and hence our data do not support a revision of the triple-reaction rate. We obtain an upper limit of 5 Â 10 À3 on the direct decay of the Hoyle state at 95% C.L., which is 1 order of magnitude better than a previous upper limit.

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confidence: 67%

Improved Limit on DirectαDecay of the Hoyle State

et al. 2012

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“…From this rather remarkable feature it is possible to determine the ground state strength from a measurement well above the peak. This behavior is the well known "ghost anomaly" expected both from theory [20] and observed in previous experiments on the 8 Be system [21]. This implies that previous measurements, which have ignored the anomaly, have overestimated the 2 1 strength by at least 20%.…”

Section: Discussionsupporting

confidence: 69%

Measurement of the full excitation spectrum of the 7Li(p,γ)αα reaction at 441 keV

et al. 2018

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A current challenge for ab initio calculations is systems that contain large continuum contributions such as 8 Be. We report on new measurements of radiative decay widths in this nucleus that test recent Green's function Monte Carlo calculations.Traditionally, γ ray detectors have been utilized to measure the high energy photons from the 7 Li(p, γ)αα reaction. However, due to the complicated response function of these detectors it has not yet been possible to extract the full γ ray spectrum from this reaction. Here we present an alternative measurement using large area Silicon detectors to detect the two α particles, which provides a practically background free spectrum and retains good energy resolution.The resulting spectrum is analyzed using a many-level multi channel R-matrix parametrization. Improved values for the radiative widths are extracted from the R-matrix fit. We find evidence for significant non-resonant continuum contributions and tentative evidence for a broad 0 + resonance at 12 MeV.

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“…The shape of this tail is, as the energy increases, determined by the competition between the increasing denominator in the ground-state line shape and (in the numerator) the rapidly increasing penetration factor for the α-α breakup through the Coulomb barrier [38][39][40][41]. This blown-up high-energy tail of the 8 Be ground-state distribution is what is known as the ghost of the 8 Be ground state.…”

Section: Breakup Through the Ghost Of The 8 Be Ground Statementioning

confidence: 99%