Experimental investigation of 
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 condensation in light nuclei

Bishop, J.; Kokalova, Tzany; Freer, M.; Acosta, L.; Assié, M.; Bailey, S.; Cardella, G.; Curtis, N.; Filippo, E. De; Dell’Aquila, D.; Luca, S. De; Francalanza, L.; Gnoffo, B.; Lanzalone, G.; Lombardo, I.; Martorana, N. S.; Norella, S.; Pagano, A.; Pagano, E. V.; Papa, M.; Pirrone, S.; Politi, G.; Rizzo, F.; Russotto, P.; Quattrocchi, L.; Smith, Robin; Stefan, I.; Trifiró, A.; Trimarchi, M.; Verde, G.; Vigilante, M.; Wheldon, C.

doi:10.1103/physrevc.100.034320

Cited by 39 publications

(35 citation statements)

References 50 publications

(164 reference statements)

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“…It is also interesting to extend the analysis here to heavier nuclei such as 12 C, 16 O, and 20 Ne. It is particularly interesting to study the resonant and reaction properties of the Hoyle and high-lying Hoylelike states [1][2][3][4][5][6][76][77][78][79][80] with explicit treatments of the asymptotic boundary conditions.…”

Section: Discussionmentioning

confidence: 99%

Resonant and scattering states in the α+α system from the nonlocalized cluster model

Bai

Ren

2020

Phys. Rev. C

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The non-localized cluster model provides a new perspective on nuclear cluster effects and has been applied successfully to study cluster structures in various bound states and quasi-bound states (i.e., long-lived resonant states). In this work, we extend the application scope of the non-localized cluster model further to resonant and scattering states. Following the R-matrix theory, the configuration space is divided into the interior and exterior regions by a large channel radius such that the nuclear forces and the antisymmetrization effects become negligible between clusters in the exterior region. In the interior region, the picture of non-localized clustering is realized mathematically by adopting the Brink-Tohsaki-Horiuchi-Schuck-Röpke (Brink-THSR) wave functions as the bases to construct the interior wave functions. The Bloch-Schrödinger equation is used to match the interior wave functions continuously with the asymptotic boundary conditions of the resonant and scattering states at the channel radius, which leads eventually to solutions of the problem. As a first test of the formalism, the low-lying resonant states of 8 Be and the phase shifts of the α + α elastic scattering are studied. The numerical results agree well with the experimental data, which shows the validity of the theoretical framework. *

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Section: Discussionmentioning

confidence: 99%

Resonant and scattering states in the α+α system from the nonlocalized cluster model

Bai

Ren

2020

Phys. Rev. C

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“…In 16 O, the form factor for transitions from the ground state to the 15.1 MeV 0 + 6 state has not been measured. This measurement is needed since break-up measurements through the characteristic 4α final state [57,64,65] are inconclusive. Beyond oxygen, a high-multiplicity study into the decay of high energy states in 28 Si [57] assessed the equivalency of all the α-condensate decay modes.…”

Section: Discussionmentioning

confidence: 99%

“…An ideal demonstration of the clustered nature, and in particular of the α-condensate nature would be to observe an enhanced sequential α-particle emission from one α-condensate state to another. To do this, a high-energy compound nucleus reaction 12 C( 16 O, 28 Si ) was employed at beam energies of 160, 280 and 400 MeV, to populate a wide range of states in 8 Be to 28 Si [57]. By looking at the complete decay to a 7 α-particle final state, a direct search for Nα condensate states was performed by examining their complete dissociation into an Nα-particle final state.…”

Section: Oxygen-16mentioning

confidence: 99%

“…In the 12 C( 16 O, 28 Si ) study [57], to overcome the limitations of the 4α penetrability, populating this state in the 12 C( 16 O, 12 C(0 + 2 )) 16 O reaction was attempted, by reconstructing the 16 O from measuring the 12 C(0 + 2 ). From the compound nucleus, if one decay product ( 12 C(0 + 2 )) is produced which is heavily clustered, one would expect the other decay product to also be preferentially populated by heavily-clustered states.…”

Section: Oxygen-16mentioning

confidence: 99%

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The Hoyle Family: The Search for Alpha-Condensate States in Light Nuclei

et al. 2020

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Our present understanding of the structure of the Hoyle state in 12 C and other near-threshold states in α-conjugate nuclei is reviewed in the framework of the α-condensate model. The 12 C Hoyle state, in particular, is a candidate for α-condensation, due to its large radius and α-cluster structure. The predicted features of nuclear α-particle condensates are reviewed along with a discussion of their experimental indicators, with a focus on precision break-up measurements. Two experiments are discussed in detail, firstly concerning the break-up of 12 C and then the decays of heavier nuclei. With more theoretical input, and increasingly complex detector setups, precision break-up measurements can, in principle, provide insight into the structures of states in α-conjugate nuclei. However, the commonly-held belief that the decay of a condensate state will result in N α-particles is challenged. We further conclude that unambiguously characterising excited states built on α-condensates is difficult, despite improvements in detector technology. This contribution has been presented during the ceremony of the Few-Body Systems Award for young professionals.

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“…In the 12 C( 16 O, 28 Si ) study [36], to overcome the limitations of the 4α penetrability, populating this state in the 12 C( 16 O, 12 C(0 + 2 )) 16 O reaction was attempted, by reconstruct- ing the 16 O from measuring the 12 C(0 + 2 ). From the compound nucleus, if one decay product ( 12 C(0 + 2 )) is produced which is heavily clustered, one would expect the other decay product to also be preferentially populated by heavily-clustered states.…”

Section: Oxygen-16mentioning

confidence: 99%

Report on scipost_201911_00026v1

2019

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The 12 C Hoyle state is a candidate for α-condensation, due to its large volume and αcluster structure. This paper discusses precision break-up measurements and how they can elucidate α-condensate structures. Two experiments are discussed in detail, firstly concerning the break-up of 12 C and then the decays of heavier nuclei. With more theoretical input, and increasingly complex detector setups, precision break-up measurements can, in principle, provide insight into the structures of states in α-conjugate nuclei. At present, such searches have not delivered evidence for α-condensation in 12 C or 16 O.

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Experimental investigation of α condensation in light nuclei

Cited by 39 publications

References 50 publications

Resonant and scattering states in the α+α system from the nonlocalized cluster model

Resonant and scattering states in the α+α system from the nonlocalized cluster model

The Hoyle Family: The Search for Alpha-Condensate States in Light Nuclei

Report on scipost_201911_00026v1

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