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Title: Understanding emergent collectivity and clustering in nuclei from a symmetry-based no-core shell-model perspective

Authors:
; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1351043
Grant/Contract Number:
SC0005248
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 95; Journal Issue: 4; Related Information: CHORUS Timestamp: 2017-04-10 22:22:35; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Dreyfuss, A. C., Launey, K. D., Dytrych, T., Draayer, J. P., Baker, R. B., Deibel, C. M., and Bahri, C. Understanding emergent collectivity and clustering in nuclei from a symmetry-based no-core shell-model perspective. United States: N. p., 2017. Web. doi:10.1103/PhysRevC.95.044312.
Dreyfuss, A. C., Launey, K. D., Dytrych, T., Draayer, J. P., Baker, R. B., Deibel, C. M., & Bahri, C. Understanding emergent collectivity and clustering in nuclei from a symmetry-based no-core shell-model perspective. United States. doi:10.1103/PhysRevC.95.044312.
Dreyfuss, A. C., Launey, K. D., Dytrych, T., Draayer, J. P., Baker, R. B., Deibel, C. M., and Bahri, C. Mon . "Understanding emergent collectivity and clustering in nuclei from a symmetry-based no-core shell-model perspective". United States. doi:10.1103/PhysRevC.95.044312.
@article{osti_1351043,
title = {Understanding emergent collectivity and clustering in nuclei from a symmetry-based no-core shell-model perspective},
author = {Dreyfuss, A. C. and Launey, K. D. and Dytrych, T. and Draayer, J. P. and Baker, R. B. and Deibel, C. M. and Bahri, C.},
abstractNote = {},
doi = {10.1103/PhysRevC.95.044312},
journal = {Physical Review C},
number = 4,
volume = 95,
place = {United States},
year = {Mon Apr 10 00:00:00 EDT 2017},
month = {Mon Apr 10 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevC.95.044312

Citation Metrics:
Cited by: 1work
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  • Clear evidence for symplectic symmetry in low-lying states of {sup 12}C and {sup 16}O is reported. Eigenstates of {sup 12}C and {sup 16}O, determined within the framework of the no-core shell model using the JISP16 NN realistic interaction, typically project at the 85-90% level onto a few of the most deformed symplectic basis states that span only a small fraction of the full model space. The results are nearly independent of whether the bare or renormalized effective interactions are used in the analysis. The outcome confirms Elliott's SU(3) model which underpins the symplectic scheme, and above all, points to themore » relevance of a symplectic no-core shell model that can reproduce experimental B(E2) values without effective charges as well as deformed spatial modes associated with clustering phenomena in nuclei.« less
  • Clear evidence for symplectic symmetry in low-lying states of {sup 12}C and {sup 16}O is reported. Eigenstates of {sup 12}C and {sup 16}O, determined within the framework of the no-core shell model using the J-matrix inverse scattering potential with A{<=}16 (JISP16) nucleon-nucleon (NN) realistic interaction, typically project at the 85%-90% level onto a few of the most deformed symplectic basis states that span only a small fraction of the full model space. The results are nearly independent of whether the bare or renormalized effective interactions are used in the analysis. The outcome confirms Elliott's SU(3) model which underpins the symplecticmore » scheme, and above all, points to the relevance of a symplectic no-core shell model that can reproduce experimental B(E2) values without effective charges as well as deformed spatial modes associated with clustering phenomena in nuclei.« less
  • Probing shell structure at a large neutron excess has been of particular interest in recent times. Neutron-rich nuclei between the proton shell closures Z = 20 and Z = 28 offer an exotic testing ground for shell evolution. The development of the N = 40gap between neutron fp and lg{sub 9/2} shells gives rise to highly interesting variations of collectivity for nuclei in this region. While {sup 68}Ni shows doubly magic properties in level energies and transition strengths, this was not observed in neighbouring nuclei. Especially neutron-rich Fe isotopes proved particularly resistant to calculational approaches using the canonical valence spacemore » (fpg) resulting in important deviations of the predicted collectivity. Only an inclusion of the d{sub 5/2}-orbital could solve the problem [1]. Hitherto no transition strengths for {sup 66}Fe have been reported. We determined B(E2,2{sup +}{sub 1}{yields}0{sup +}{sub 1}) values from lifetimes measured with the recoil distance Doppler-shift method using the Cologne plunger for radioactive beams at National Superconducting Cyclotron Laboratory at Michigan State University. Excited states were populated by projectile Coulomb excitation for {sup 62,64,66}Fe. The data show a rise in collectivity for Fe isotopes towards N = 40. Results [2] are interpreted by means of a modified version of the Valence Proton Symmetry [3] and compared to shell model calculations using a new effective interaction recently developed for the fpgd valence space [4].« less