Collective Band Structure and Origin of Enhanced<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>E</mml:mi><mml:mn>1</mml:mn><mml:mn /></mml:math>Decays in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>18</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>

Gai, M.; Rugari, S. L.; France, R. H.; Lund, Brian J.; Zhao, Z.; Bromley, D. A.; Lincoln, Bryan; Smith, William Hayden; Zarcone, M. J.; Kessel, Q. C.

doi:10.1103/physrevlett.62.874

Cited by 17 publications

(6 citation statements)

References 16 publications

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“…A somewhat similar argumentation has recently been given by Gai et al [16]. On the basis of our argumentation one might also expect a stronger configuration mixing in the 0~" and 2~ states than predicted in the microscopic studies.…”

Section: Reduced E2 Transition Probabilitiessupporting

confidence: 60%

“…We like to mention that Gai et al [16] have suggested another possible explanation for the theoretical overestimation of the B(E2,4~ ~2~) transition strength. These authors argued that the 4~ state at 4.07 MeV, which is also rather collective, mixes strongly with the 4~-state and that the various contributions to the transition matrix elements cancel noticeably.…”

Section: Reduced E2 Transition Probabilitiesmentioning

confidence: 95%

“…These authors argued that the 4~ state at 4.07 MeV, which is also rather collective, mixes strongly with the 4~-state and that the various contributions to the transition matrix elements cancel noticeably. Furthermore, Gai et al [16] suggest that the 4~-state is missing in the microscopic calculations. (If this is true, the 4 + state calculated at 5.65 MeV might correspond to the experimental 4~ state at 6.27 MeV, in variance to the assignment in this paper.)…”

Section: Reduced E2 Transition Probabilitiesmentioning

confidence: 98%

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Microscopic multichannel calculation of the molecular dipole degree of freedom in the18O nucleus

Funck

Grund

Langanke

1989

Z. Physik A - Atomic Nuclei

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Strong B(E1) transitions have been recently observed between states in the 180 nucleus which follow roughly the energy sequence of a dimolecular e + 14C rotator. These findings have been interpreted by Gai et al. as evidence for a molecular dipole degree of freedom being present in the 180 nucleus. However, this idea was contradicted by the results of a microscopic multichannel calculation performed by Descouvemont and Baye which was based on elastic e + ~4C and inelastic e + 14 C (2 +) many-body cluster wave functions. We have improved this study by performing a microscopic multichannel calculation including additionally a n + 170 many-body fragmentation in order to enlarge our model space by those shell model components which dominate the structure of the (positive parity) 180 ground state band. Like Descouvemont and Baye we find a positive parity e + 14C molecular band in 180 and, additionally, a rather strong collectivity in the lowest 1-, 3-, and 5-states in 180. However, since the internal structure is different within these states, the calculated states should not be interpreted as a negative parity e + 14C molecular band. In this perspective, the microscopic multichannel calculations do not support the hypothesis of a molecular dipole degree of freedom being present in the tsO nucleus.

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Section: Reduced E2 Transition Probabilitiessupporting

confidence: 60%

Section: Reduced E2 Transition Probabilitiesmentioning

confidence: 95%

Section: Reduced E2 Transition Probabilitiesmentioning

confidence: 98%

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Microscopic multichannel calculation of the molecular dipole degree of freedom in the18O nucleus

Funck

Grund

Langanke

1989

Z. Physik A - Atomic Nuclei

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“…The nucleus 18 O has been an important testing ground for our understanding of the clustering in N = Z nuclei. It is of importance and interest to investigate how the extra neutrons affect and enrich the clustering, since the core nucleus 16 O has the famous 12 C + α cluster states [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Monopole and dipole transitions of the cluster states of 18O

Baba,

Kimura

2020

Preprint

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On the basis of an extended antisymmetrized molecular dynamics calculation, we study the cluster structure and the of the 0 + and 1 − states of 18 O. We discuss that several different kinds of the cluster states appear in the excitation spectrum, and their monopole and dipole transitions are interesting fingerprints of unique cluster structure. We show that the monopole/dipole transitions are enhanced for the 14 C+α cluster states, while they are hindered for the molecular-orbit state.We also point out that the ratio of the electric and isoscalar monopole transition strengths gives a good hint for the structure of the excited states.

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“…Of course, mixing occurs between 2p and 4p-26 states, but that mixing can be understood [2]. Recent B(E2) measurements [4,5] cast doubt on the dominant 4p-26 assignment for the 4+ at 7.12 MeV. A new measurement and the implications are discussed in an even more recent paper [6].…”

mentioning

confidence: 98%

Configuration off18O}(7.12 MeV,4+

Koltenuk

1995

Phys. Rev. C

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Alpha-particle widths calculated in a potential model demonstrate that the 7.12-MeV, 42 state of 0 has about the right alpha width for the dominant four-particletwo-hole 4+ state.PACS number(s): 21.10.3x, 21.60.Cs, 23.40.Hc, 27.20.+n In i 0, it has been known for a long time [1,2] that all the positive-parity states [3] below 8 MeV excitation can be understood as those arising from an (sd) shell-model space plus one collective state of each J" = 0+, 2+, and

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Collective Band Structure and Origin of EnhancedE1Decays inO18

Cited by 17 publications

References 16 publications

Microscopic multichannel calculation of the molecular dipole degree of freedom in the18O nucleus

Microscopic multichannel calculation of the molecular dipole degree of freedom in the18O nucleus

Monopole and dipole transitions of the cluster states of 18O

Configuration off18O}(7.12 MeV,4+

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