Candidates for the 5α condensed state in 20Ne

Adachi, Satoshi; Fujikawa, Yuki; Kawabata, T.; Akimune, H.; Doi, Tomoko; Furuno, T.; Harada, Takeshi; Inaba, K.; Ishida, S.; Itoh, Masatoshi; Iwamoto, Chihiro; Kobayashi, N.; Maeda, Y.; Matsuda, Y.; Murata, Mariko; Okamoto, Shintaro; Sakaue, A.; Sekiya, R.; Tamii, A.; Tsumura, M.

doi:10.1016/j.physletb.2021.136411

Cited by 25 publications

(24 citation statements)

References 35 publications

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“…The above structure change is consistent with NCM calculations [48] and the BEC four α cluster calculations using the SCM [77]. For 20 Ne, the ground state with five α clusters at the vertices of a trigonal bipyramid [78,79,80,81,82] makes a structure change near the α threshold as the excitation energy increases [36] and near the five α threshold energy well-developed gas-like α cluster BEC superfluid states [67] are expected to appear as observed in recent experiments [83,84] before the five α linear chain structure at higher energies. Fig.…”

supporting

confidence: 86%

Equivalence of generator coordinate Brink cluster model and nonlocalized cluster model and supersolidity of $α$ cluster structure in nuclei

Ohkubo

2020

Preprint

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It is found that α cluster structure has the apparently opposing dual property of crystallinity and condensation simultaneously. The mathematical equivalence of the spatially localized Brink α cluster model in the generator coordinate method (GCM) and the nonlocalized cluster model (NCM), which is also called the THSR (Tohsaki-Horiuchi-Schuck-Röpke) wave function based on the condensation of α clusters, is shown. The latter is found to be an equivalent representation of the localized cluster model and it is a natural consequence that the many NCM (THSR) calculations reproduce the proceeding cluster model calculations using the GCM and the resonating group method (RGM). Localized cluster models, which have been successfully used for more than half a century, will continue to be very powerful. The equivalence is a manifestation of the duality of incompatible aspects: crystallinity and coherent wave nature due to condensation of α clusters, i.e. the dual properties of a supersolid. The Pauli principle causes the duality. The evidence for supersolidity, the emergence of a Nambu-Goldstone mode caused by the spontaneous symmetry breaking of the global phase, is discussed.

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supporting

confidence: 86%

Equivalence of generator coordinate Brink cluster model and nonlocalized cluster model and supersolidity of $α$ cluster structure in nuclei

Ohkubo

2020

Preprint

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“…We found a large amount of inelastic scattering data 𝛼 + 20 Ne in a wide energy range 30-400 MeV [34,[38][39][40]. However, we haven't found angular distributions for the states above 8 MeV excitations in literature.…”

Section: Resultsmentioning

confidence: 99%

“…However, we haven't found angular distributions for the states above 8 MeV excitations in literature. So hypothesis proposed in [34] we can't check via MDM. Angular distributions are present for the g.s.…”

Section: Resultsmentioning

confidence: 99%

“…S. Adachi and collaborators conducted [34] the coincidence measurement of 𝛼 particles inelastically scattered from 20 Ne at 0 ∘ and decay charged particles in order to search for the alpha-particle condensed state. It was found that the newly observed states at E x = 23.6, 21.8, and 21.2 MeV in 20 Ne are strongly coupled to a candidate for the 4𝛼 condensed state in 16 O.…”

Section: Introductionmentioning

confidence: 99%

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Search for possible alpha-condensate states in $^{20}$Ne

Demyanova¹,

Danilov²,

Goncharov³

et al. 2022

Preprint

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The root mean square radii of 20 Ne in the short-lived excited states were experimentally deduced for the first time from the analyses of 𝛼+ 20 Ne diffraction scattering. Differential cross sections of the elastic and inelastic 𝛼+ 20 Ne scattering in the incident energy range from a few MeV/nucleon up to 100 MeV/nucleon were analyzed by the modified diffraction model. No significant radius enhancement for the members of K 𝜋 = 0 + 1 and K 𝜋 = 2 − bands in comparison with the ground state was observed. At the same time 20% radius enhancement was obtained for the K 𝜋 = 0 − 1 band members. Moreover, for the 0 + 2 state located above 𝛼emission threshold increased radius was observed. This result can speak in favor of possible 𝛼-condensate structure of the 0 + 2 state and can be considered as a possible analog of the famous 7.65-MeV 0 + 2 Hoyle state of 12 C.

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“…The theoretical calculation with the Gross-Pitaevskii and Hill-Wheeler equations by Yamada and Schuck [11] predicts that the kα condensed states with similar properties to the 0 + 2 state can exist in heavier self-conjugated A = 4k nuclei up to 40 Ca. The experimental searches for such α condensed states are being intensively carried out in 16 O [12][13][14][15], 20 Ne [16], 24 Mg [17], and 28 Si [18].…”

Section: Introductionmentioning

confidence: 99%

Search for $α$ condensed states in $^{13}$C using $α$ inelastic scattering

Inaba,

Sasamoto,

Kawabata

et al. 2021

Preprint

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We searched for the α condensed state in 13 C by measuring the α inelastic scattering at E α = 388 MeV at forward angles including 0 degrees. We performed the distortedwave Born-approximation calculation with the single-folding potential and the multipole decomposition analysis to determine the isoscalar transition strengths in 13 C. We found a bump structure around E x = 12.5 MeV due to the isoscalar monopole (IS0) transition. A peak-fit analysis suggested that this bump consisted of several 1/2 − states. We propose that this bump is due to the mirror state of the 13.5 MeV-state in 13 N, which dominantly decays to the α condensed state in 12 C. It was speculated that the 1/2 − states around E x = 12.5 MeV were candidates for the α condensed state, but the 3α + n orthogonality condition model suggests that the α condensed state is unlikely to emerge as the negative parity states. We also found two 1/2 + or 3/2 + states at E x = 14.5 and 16.1 MeV excited with the isoscalar dipole (IS1) strengths. We suggest that the 16.1-MeV state is a possible candidate for the α condensed state predicted by the cluster-model calculations

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Candidates for the 5α condensed state in 20Ne

Cited by 25 publications

References 35 publications

Equivalence of generator coordinate Brink cluster model and nonlocalized cluster model and supersolidity of $α$ cluster structure in nuclei

Equivalence of generator coordinate Brink cluster model and nonlocalized cluster model and supersolidity of $α$ cluster structure in nuclei

Search for possible alpha-condensate states in $^{20}$Ne

Search for $α$ condensed states in $^{13}$C using $α$ inelastic scattering

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