Shape coexistence in the N = 19 neutron-rich nucleus 31Mg explored by β–γ spectroscopy of spin-polarized 31Na

H. Nishibata; T. Shimoda; A. Odahara; S. Morimoto; S. Kanaya; A. Yagi; H. Kanaoka; M. R. Pearson; C. D.P. Levy; M. Kimura

doi:10.1016/j.physletb.2017.01.049

Shape coexistence in the N = 19 neutron-rich nucleus ³¹Mg explored by β–γ spectroscopy of spin-polarized ³¹Na

H. Nishibata, T. Shimoda, A. Odahara, S. Morimoto, S. Kanaya, A. Yagi, H. Kanaoka, M. R. Pearson, C. D.P. Levy, M. Kimura

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

The structure of excited states in the neutron-rich nucleus ³¹Mg, which is in the region of the “island of inversion” associated with the neutron magic number N=20, is studied by β–γ spectroscopy of spin-polarized ³¹Na. Among the ³¹Mg levels below the one neutron separation energy of 2.3 MeV, the spin values of all five positive-parity levels are unambiguously determined by observing the anisotropic β decay. Two rotational bands with K^π=1/2⁺ and 1/2⁻ are proposed based on the spins and energies of the levels. Comparison on a level-by-level basis is performed between the experimental results and theoretical calculations by the antisymmetrized molecular dynamics (AMD) plus generator coordinate method (GCM). It is found that various nuclear structures coexist in the low excitation energy region in ³¹Mg.

Original language	English
Pages (from-to)	81-85
Number of pages	5
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	767
DOIs	https://doi.org/10.1016/j.physletb.2017.01.049
Publication status	Published - Apr 10 2017
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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10.1016/j.physletb.2017.01.049

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Nishibata, H., Shimoda, T., Odahara, A., Morimoto, S., Kanaya, S., Yagi, A., Kanaoka, H., Pearson, M. R., Levy, C. D. P., & Kimura, M. (2017). Shape coexistence in the N = 19 neutron-rich nucleus ³¹Mg explored by β–γ spectroscopy of spin-polarized ³¹Na. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 767, 81-85. https://doi.org/10.1016/j.physletb.2017.01.049

Shape coexistence in the N = 19 neutron-rich nucleus ³¹Mg explored by β–γ spectroscopy of spin-polarized ³¹Na. / Nishibata, H.; Shimoda, T.; Odahara, A.; Morimoto, S.; Kanaya, S.; Yagi, A.; Kanaoka, H.; Pearson, M. R.; Levy, C. D.P.; Kimura, M.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 767, 10.04.2017, p. 81-85.

Research output: Contribution to journal › Article › peer-review

Nishibata, H, Shimoda, T, Odahara, A, Morimoto, S, Kanaya, S, Yagi, A, Kanaoka, H, Pearson, MR, Levy, CDP & Kimura, M 2017, 'Shape coexistence in the N = 19 neutron-rich nucleus ³¹Mg explored by β–γ spectroscopy of spin-polarized ³¹Na', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 767, pp. 81-85. https://doi.org/10.1016/j.physletb.2017.01.049

Nishibata, H. ; Shimoda, T. ; Odahara, A. ; Morimoto, S. ; Kanaya, S. ; Yagi, A. ; Kanaoka, H. ; Pearson, M. R. ; Levy, C. D.P. ; Kimura, M. / Shape coexistence in the N = 19 neutron-rich nucleus ³¹Mg explored by β–γ spectroscopy of spin-polarized ³¹Na. In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2017 ; Vol. 767. pp. 81-85.

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title = "Shape coexistence in the N = 19 neutron-rich nucleus 31Mg explored by β–γ spectroscopy of spin-polarized 31Na",

abstract = "The structure of excited states in the neutron-rich nucleus 31Mg, which is in the region of the “island of inversion” associated with the neutron magic number N=20, is studied by β–γ spectroscopy of spin-polarized 31Na. Among the 31Mg levels below the one neutron separation energy of 2.3 MeV, the spin values of all five positive-parity levels are unambiguously determined by observing the anisotropic β decay. Two rotational bands with Kπ=1/2+ and 1/2− are proposed based on the spins and energies of the levels. Comparison on a level-by-level basis is performed between the experimental results and theoretical calculations by the antisymmetrized molecular dynamics (AMD) plus generator coordinate method (GCM). It is found that various nuclear structures coexist in the low excitation energy region in 31Mg.",

author = "H. Nishibata and T. Shimoda and A. Odahara and S. Morimoto and S. Kanaya and A. Yagi and H. Kanaoka and Pearson, {M. R.} and Levy, {C. D.P.} and M. Kimura",

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doi = "10.1016/j.physletb.2017.01.049",

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T1 - Shape coexistence in the N = 19 neutron-rich nucleus 31Mg explored by β–γ spectroscopy of spin-polarized 31Na

AU - Nishibata, H.

AU - Shimoda, T.

AU - Odahara, A.

AU - Morimoto, S.

AU - Kanaya, S.

AU - Yagi, A.

AU - Kanaoka, H.

AU - Pearson, M. R.

AU - Levy, C. D.P.

AU - Kimura, M.

PY - 2017/4/10

Y1 - 2017/4/10

N2 - The structure of excited states in the neutron-rich nucleus 31Mg, which is in the region of the “island of inversion” associated with the neutron magic number N=20, is studied by β–γ spectroscopy of spin-polarized 31Na. Among the 31Mg levels below the one neutron separation energy of 2.3 MeV, the spin values of all five positive-parity levels are unambiguously determined by observing the anisotropic β decay. Two rotational bands with Kπ=1/2+ and 1/2− are proposed based on the spins and energies of the levels. Comparison on a level-by-level basis is performed between the experimental results and theoretical calculations by the antisymmetrized molecular dynamics (AMD) plus generator coordinate method (GCM). It is found that various nuclear structures coexist in the low excitation energy region in 31Mg.

AB - The structure of excited states in the neutron-rich nucleus 31Mg, which is in the region of the “island of inversion” associated with the neutron magic number N=20, is studied by β–γ spectroscopy of spin-polarized 31Na. Among the 31Mg levels below the one neutron separation energy of 2.3 MeV, the spin values of all five positive-parity levels are unambiguously determined by observing the anisotropic β decay. Two rotational bands with Kπ=1/2+ and 1/2− are proposed based on the spins and energies of the levels. Comparison on a level-by-level basis is performed between the experimental results and theoretical calculations by the antisymmetrized molecular dynamics (AMD) plus generator coordinate method (GCM). It is found that various nuclear structures coexist in the low excitation energy region in 31Mg.

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JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

ER -

Shape coexistence in the N = 19 neutron-rich nucleus ³¹Mg explored by β–γ spectroscopy of spin-polarized ³¹Na

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