Improved precision on the experimental 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>E</mml:mi><mml:mn>0</mml:mn></mml:mrow></mml:math>
 decay branching ratio of the Hoyle state

Kibédi, T.; Reed, M. W.; Stuchbery, A.E.; Cook, K. J.; Akber, A.; Alshahrani, B.; Avaa, A. A.; Banerjee, K.; Berriman, Annette; Bezzina, L. T.; Bignell, L. J.; Buete, J.; Carter, I. P.; Coombes, B. J.; Dowie, J. T. H.; Dasgupta, M.; Evitts, L. J.; Garnsworthy, A. B.; Gerathy, M. S. M.; Gray, Tom J.; Hinde, David; Hoang, T.; Hota, S. S.; Ideguchi, E.; Jones, P.; Lane, G. J.; McCormick, B. P.; Mitchell, A. J.; Palalani, N.; Palazzo, T.; Ripper, Margie; Simpson, E. C.; Smallcombe, J.; Swinton-Bland, B. M. A.; Tanaka, T.; Tornyi, T.; Vries, M. de

doi:10.1103/physrevc.102.024320

Cited by 17 publications

(45 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(4) by a factor of 2; the present data (Table I) agree within 2%. Finally, using the recommended Γ π ðE0Þ=Γ [25], the adopted Γ E0 π , and our Γ rad =Γ values, the radiative width of the Hoyle state is Γ rad ¼ 5.1ð6Þ × 10 −3 eV. This result suggests a significantly higher radiative width than currently adopted.…”

mentioning

confidence: 63%

“…The higher proton energy was employed to shift the inelastically scattered protons to ∼1.5 MeV, well above the detecting threshold. Proton angular distribution measurements [25] suggest that the ratio of the excitation of the 4.44 and 7.65 MeV states is essentially the same at 10.5 and 10.7 MeV. In the present experiments a beam intensity of 5 nA was used, keeping the total count rate below 3 kHz.…”

mentioning

confidence: 92%

“…Combining all previous measurements [20][21][22][23][24], a value of Γ π ðE0Þ=Γ ¼ 6.7ð6Þ × 10 −6 was adopted [1]. This value has been further improved by a new pair conversion measurement at the Australian National University [25] and a Γ π ðE0Þ=Γ ratio of 7.6ð4Þ × 10 −6 was recommended.…”

mentioning

confidence: 99%

“…(3) and using numerical values from Table I, we again obtain Γ E2 γ =Γ ¼ 6.1ð6Þ × 10 −4 . Using the theoretical total conversion coefficient, α tot ðE2; 3.21 MeVÞ ¼ 8.77ð13Þ × 10 −4 [40] and the recommended value of Γ π ðE0Þ=Γ [25], we obtain Γ rad =Γ ¼ 6.2ð6Þ × 10 −4 . This value is more than 3σ away from the currently recommended Γ rad =Γ value [1].…”

mentioning

confidence: 99%

See 3 more Smart Citations

Radiative Width of the Hoyle State from γ -Ray Spectroscopy

et al. 2020

Self Cite

View full text Add to dashboard Cite

The cascading 3.21 and 4.44 MeV electric quadrupole transitions have been observed from the Hoyle state at 7.65 MeV excitation energy in 12 C, excited by the 12 Cðp; p 0 Þ reaction at 10.7 MeV proton energy. From the proton-γ-γ triple coincidence data, a value of Γ rad =Γ ¼ 6.2ð6Þ × 10 −4 was obtained for the radiative branching ratio. Using our results, together with Γ E0 π =Γ from Eriksen et al. [Phys. Rev. C 102, 024320 (2020)] and the currently adopted Γ π ðE0Þ values, the radiative width of the Hoyle state is determined as Γ rad ¼ 5.1ð6Þ × 10 −3 eV. This value is about 34% higher than the currently adopted value and will impact models of stellar evolution and nucleosynthesis.

show abstract

mentioning

confidence: 63%

mentioning

confidence: 92%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Radiative Width of the Hoyle State from γ -Ray Spectroscopy

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Of particular interest is 12 C, which exhibits shell-model and α-cluster structures. The Hoyle state in 12 C is the archetypal α-cluster state [3], remaining the focus of considerable study, including efforts to measure its direct [4,5,6,7,8,9], γ [10] and E0 decay branching ratios [11]. Such decay branches are astrophysically significant; the Hoyle state mediates the 3α reaction producing 12 C. The 3α reaction rate requires an accurate description of the Hoyle-state properties (e.g., resonance energy E r , partial and total widths, Γ i and Γ) and their evolution with excitation energy.…”

mentioning

confidence: 99%

Investigating the predicted breathing-mode excitation of the Hoyle state

Li,

Smit,

Adsley

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

Knowledge of the low-lying monopole strength in 12 C-the Hoyle state in particular-is crucial for our understanding of both the astrophysically important 3α reaction and of α-particle clustering. Multiple theoretical models have predicted a breathing mode of the Hoyle State at E x ≈ 9 MeV, corresponding to a radial in-phase oscillation of the underlying α clusters. The 12 C(α, α ′ ) 12 C and 14 C(p, t) 12 C reactions were employed to populate states in 12 C in order to search for this predicted breathing mode. A selfconsistent, simultaneous analysis of the inclusive spectra with R-matrix lineshapes, together with angular distributions of chargedparticle decay, yielded clear evidence for excess monopole strength at E x ≈ 9 MeV which is highly collective. Reproduction of the experimentally observed inclusive yields using a fit, with consistent population ratios for the various broad states, required an additional source of monopole strength. The interpretation of this additional monopole resonance as the breathing-mode excitation of the Hoyle state would provide evidence supporting a D 3h symmetry for the Hoyle state itself. The excess monopole strength may complicate analysis of the properties of the Hoyle state, modifying the temperature dependence of the 3α rate at T 9 2 and ultimately, the predicted nucleosynthesis in explosive stars.

show abstract

Clusters in light nuclei: history and recent developments

Lombardo,

Dell’Aquila

2023

Riv. Nuovo Cim.

View full text Add to dashboard Cite

In this review, we discuss recent advancements in the study of clustering phenomena occurring in light nuclei, and their influence on nuclear structure, dynamics, and astrophysics. In the introduction, we outline the historical steps leading to the concept of $$\alpha $$ α -clusterization in nuclei and provide a comprehensive description of the evolution of nuclear models capable to describe clustering aspects in nuclear systems and of the main experiments and discoveries leading to the development of this research field. We also describe some spectroscopic techniques that are used to establish the clustered nature of a given nuclear state. Some relevant experimental and theoretical findings recently reported both in experimental and theoretical works are discussed in the text. We put emphasis on recent achievements and remaining problems in the description of the structure of light isotopes, from helium to neon, including both self- and non-self-conjugate nuclei. Particular attention to the implication in the nuclear astrophysics context and to clustering effects in the dynamics of nuclear reactions is pursued all along the review.

show abstract

Improved precision on the experimental E0 decay branching ratio of the Hoyle state

Cited by 17 publications

References 41 publications

Radiative Width of the Hoyle State from γ -Ray Spectroscopy

Radiative Width of the Hoyle State from γ -Ray Spectroscopy

Investigating the predicted breathing-mode excitation of the Hoyle state

Clusters in light nuclei: history and recent developments

Contact Info

Product

Resources

About