Characterization of the proposed 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mn>4</mml:mn><mml:mtext>−</mml:mtext><mml:mi>α</mml:mi></mml:math>
 cluster state candidate in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">O</mml:mi><mml:mprescripts /><mml:none /><mml:mn>16</mml:mn></mml:mmultiscripts></mml:math>

Li, K. C. W.; Neveling, R.; Adsley, P.; Papka, P.; Smit, F. D.; Brümmer, J. W.; Diget, C. Aa.; Freer, M.; Harakeh, Mohsen; Kokalova, Tz.; Nemulodi, F.; Pellegri, L.; Rebeiro, B.; Swartz, J. A.; Triambak, S.; Zyl, J. J. van; Wheldon, C.

doi:10.1103/physrevc.95.031302

Cited by 32 publications

(37 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our excitation function shows 8 events at 15.2+ 0.2 MeV that could correspond to the 0 6 + state in 16 O analogous to the 12 C Hoyle state. This state has been observed in the past by several authors [32][33][34][35] and recently by K.C.W Li et al [36]. The other structures in the excitation function correspond to 16 O states already observed by other authors.…”

Section: Alpha Multiplicity Four Eventssupporting

confidence: 79%

Searching for states analogous to the 12C Hoyle state in heavier nuclei using the thick target inverse kinematics technique

Barbui

Hagel

Gauthier

et al. 2018

AIP Conference Proceedings

View full text Add to dashboard Cite

Identification of alpha cluster states analogous to the 12 C Hoyle state in heavier alphaconjugate nuclei can provide tests of the existence of alpha condensates in nuclei. Such states are predicted for 16 O, 20 Ne, 24 Mg,28 Si etc. at excitation energies slightly above the multi-alpha particle decay threshold, but have not yet been experimentally identified. The Thick Target Inverse Kinematics (TTIK) technique can be used to study the breakup of excited self-conjugate nuclei into many alpha particles. The reaction 20 Ne+α was studied using a 20 Ne beam at 12 MeV/nucleon from the K150 cyclotron at Texas A&M University. The TTIK method was used to study both single α-particle emission and multiple α-particle decays. Events with alpha multiplicity up to four were analyzed. The analysis of the three α -particle emission data allowed the identification of the Hoyle state and other 12 C excited states decaying into three alpha particles. The results are shown and compared with other data available in the literature. Although the statistics for events with alpha multiplicity four is low, the data show a structure at about 15.2 MeV that could indicate the existence in 16 O of a state analogous to the 12 C Hoyle state. This structure is confirmed by the re-analysis of alpha multiplicity four events from a previous experiment performed at 9.7 MeV/nucleon with a similar setup but lower granularity. Moreover, the reconstructed excitation energy of 24 Mg for these events peaks at around 34 MeV, very close to the predicted excitation energy for an excited state analogous to the 12 C Hoyle state in 24 Mg. Introduction:The alpha cluster structure of nuclei with an equal number of protons and neutrons (alpha conjugate nuclei) was categorized in 1968 by Ikeda [1] to explain some excited states not reproduced by the shell model. Since then many studies have been performed, but alpha clustering is still not completely understood especially in the medium-light and heavy systems. In the last ten years a lot of theoretical effort has been focused on the study of 0 + states built on alpha-particle cores in self-conjugate nuclei at excitation energies slightly above the multi-alpha particle decay threshold. Those states are described as diluted gases of alpha particles occupying the same 0 + orbital. They are characterized by a larger radius compared to the normal bound states so that the interaction between alpha particles is reduced. Therefore, these states can be considered as the best candidates for Bose-Einstein condensates of alpha particles in the atomic nucleus. Examples of such states are the ground state of 8 Be and the famous 12 C Hoyle state. Analogous states are predicted for 16 O, 20 Ne, 24 Mg, 28 Si etc. at excitation energies slightly above the multi-alpha particle decay threshold, but have not yet been experimentally identified [2,3].

show abstract

Section: Alpha Multiplicity Four Eventssupporting

confidence: 79%

Searching for states analogous to the 12C Hoyle state in heavier nuclei using the thick target inverse kinematics technique

Barbui

Hagel

Gauthier

et al. 2018

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…Due to the different NJL parameterizations and collision energies in the present study compared to that in Ref. [17], neither of the trajectories enters the spinodal region, i.e., (∂P/∂ρ 0 ) T < 0, as marked approximately in Fig. 7.…”

Section: Discussionmentioning

confidence: 52%

“…This means that the central region in the partonic phase doesn't pass through a first-order liquid-gas phase transition in this study. The EoS from R V = 1.1 is even stiffer, and the spinodal region disappears [17].…”

Section: Discussionmentioning

confidence: 97%

See 1 more Smart Citation

Directed flow in an extended multiphase transport model

Guo

Liu

2018

Phys. Rev. C

View full text Add to dashboard Cite

We have studied the rapidity-odd directed flow in 197 Au+ 197 Au collisions in the beam energy range from √ sNN = 7.7 to 39 GeV within the framework of an extended multiphase transport model with both partonic and hadronic mean-field potentials incorporated. Effects of the partonic scatterings, mean-field potentials, hadronization, and hadronic evolution on the directed flow are investigated, and it is found that the final directed flow is mostly sensitive to the partonic scatterings and the hadronization mechanism. Our study shows that a negative slope of the proton directed flow does not necessarily need the equation of state with a first-order phase transition. PACS numbers: 25.75.-q, 25.75.Ld, 24.10.Lx

show abstract

“…ANGCOR [14] was then employed to calculate the m-state population ratios which are used to determine the angular correlations of decay [15].…”

Section: Pos(inpc2016)040mentioning

confidence: 99%

Refuting The Nature Of The Sixth 0+ Hoyle-analogue State Candidate In 16O

Li¹,

Adsley²,

Neveling³

et al. 2017

Proceedings of the 26th International Nuclear Physics Conference — PoS(INPC2016)

Self Cite

View full text Add to dashboard Cite

+ 6 state, previously observed at E x = 15.097(5) MeV. This state is identified by several theoretical cluster calculations to be a good candidate for the 4-α cluster state, analogous to the Hoyle state in 12 C. Whilst much theoretical work has been performed to reconcile a calculated α-cluster state with this resonance, the experimental information on this state remained very scarce. To investigate this state, the 16 O(α, α ) reaction was studied at θ lab = 0 • at an incident energy of E lab = 200 MeV using the K600 magnetic spectrometer at iThemba LABS. For the first time, the decay channels of the E x = 15.097(5) MeV state were isolated using a large acceptance silicon-strip detector array at backward angles. The lineshapes of the states were analysed within a phenomenological R-matrix framework. Results indicate the presence of a resonance at E x ≈ 15 MeV which does not exhibit a J π = 0 + nature.

show abstract

Characterization of the proposed 4−α cluster state candidate in O16

Cited by 32 publications

References 25 publications

Searching for states analogous to the 12C Hoyle state in heavier nuclei using the thick target inverse kinematics technique

Searching for states analogous to the 12C Hoyle state in heavier nuclei using the thick target inverse kinematics technique

Directed flow in an extended multiphase transport model

Refuting The Nature Of The Sixth 0+ Hoyle-analogue State Candidate In 16O

Contact Info

Product

Resources

About