The spin-parities of the 13.35 MeV state and high-lying excited states around 20 MeV in $$^{12}$$C nucleus

Demyanova, A. S.; Starastsin, V. I.; Ogloblin, A. A.; Danilov, A. N.; Trzaska, W. H.; Heikkinen, Pauli; Belyaeva, T. L.; Goncharov, S. A.; Маслов, В. А.; Sobolev, Yuri; Gurov, Yury; Chernyshev, B. A.; Burtebaev, N.; Janseitov, D. M.; Khlebnikov, S. V.

doi:10.1140/epja/s10050-021-00515-7

Cited by 3 publications

(2 citation statements)

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“…For the state at 20.98 MeV, the J π = 3 − and T = 0 assignments were suggested, while for the 22.4 Mev state (J π = 5 − according to [205], and belonging to the ground state band as predicted by the ACM) a possible alternative J π = 6 + assignment is derived from the DWBA analysis of the angular distribution, even if the presence of a couple of states with J π = 5 − and J π = 6 + in close vicinity cannot be excluded. Under this assumption, a state at around 22.4 MeV with J π = 6 + could fit well in the Hoyle band [486].…”

Section: Clustering In 12 Cmentioning

confidence: 94%

“…A recent proton-transfer experiment 11 B( 3 He,d) 12 C at 25 MeV studied the spectroscopic properties of several excited states in 12 C up to about 23 MeV excitation energy [486]. For the state at 20.98 MeV, the J π = 3 − and T = 0 assignments were suggested, while for the 22.4 Mev state (J π = 5 − according to [205], and belonging to the ground state band as predicted by the ACM) a possible alternative J π = 6 + assignment is derived from the DWBA analysis of the angular distribution, even if the presence of a couple of states with J π = 5 − and J π = 6 + in close vicinity cannot be excluded.…”

Section: Clustering In 12 Cmentioning

confidence: 99%

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Clusters in light nuclei: history and recent developments

Lombardo,

Dell’Aquila

2023

Riv. Nuovo Cim.

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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.

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Section: Clustering In 12 Cmentioning

confidence: 94%

Section: Clustering In 12 Cmentioning

confidence: 99%

Clusters in light nuclei: history and recent developments

Lombardo,

Dell’Aquila

2023

Riv. Nuovo Cim.

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Size Isomers at Threshold States

Demyanova,

Danilov,

Starastsin

et al. 2023

Phys. Atom. Nuclei

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An overview is provided for a new class of states, which we have named as the size isomers. Such states are weakly bound and have an exotic structure (cluster states, halo/‘‘skin’’). The development of methods for measuring the radii of nuclei in their short-lived excited states led to the discovery of new classes of states. The size of a nucleus defined by the radius of its nucleon (proton and neutron) density distribution and the proton charge distribution is one of the most fundamental and important nuclear characteristics. Nuclear radius determines the basic properties of nuclei and is a consequence of the fundamental features of the strong interaction. Up to now two groups of the size isomers were identified: the excited states with halos ($${}^{9}$$Be, $${}^{11}$$Be, $${}^{13}$$C, $${}^{13}$$N) and some specific alpha-cluster states ($${}^{11}$$B, $${}^{12}$$C, $${}^{13}$$C). All the observed states are dilute, however, some indication to possible existence of more compact than the ground states was obtained as well (in $${}^{13}$$C). The phenomenon of size isomerism occurred to be not a rare one especially if we take into account rotational bands based on some of such states. The structure of size isomers is related with some new features, e.g., rotating halos, halos in continuum, different types of quasimolecular configurations. Some rudimentary signs of alpha-particle condensation (a ‘‘ghost’’ of condensate) were observed in the Hoyle state of $${}^{12}$$C, however, we cannot speak about confirmation of this ambitious theory. Analogs to the Hoyle state, expected in $${}^{11}$$B, $${}^{13}$$C, $${}^{16}$$O, $${}^{20}$$Ne near the $$\alpha$$-emission thresholds, are considered.

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