TY - JOUR
T1 - Structure of the neutron-rich nucleus Mg 30
AU - Nishibata, H.
AU - Tajiri, K.
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.
AU - Tsunoda, N.
AU - Otsuka, T.
N1 - Funding Information:
This work was supported by JSPS KAKENHI Grants of JP25247039, JP15H03659, JP17H02891, JP18K13574, JP18KK0084, and JP19H01926. The present experiment was performed under the program number S1391 at TRIUMF. TRIUMF receives federal funding via a contribution agreement through the National Research Council of Canada.
Funding Information:
The authors are grateful to the TRIUMF staff for their excellent support and the target development. The authors thank Dr. N. Hinohara for valuable discussions and comments on the CHFB LQRPA calculation. This work was supported by JSPS KAKENHI Grants of JP25247039, JP15H03659, JP17H02891, JP18K13574, JP18KK0084, and JP19H01926. The present experiment was performed under the program number S1391 at TRIUMF. TRIUMF receives federal funding via a contribution agreement through the National Research Council of Canada.
Publisher Copyright:
© 2020 American Physical Society.
PY - 2020/11/25
Y1 - 2020/11/25
N2 - Structure of the neutron-rich nucleus Mg30, which is located close to the region of the N=20 "island of inversion,"has been investigated by β-γ spectroscopy of spin-polarized Na30. From the detailed γ-γ coincidence relations, nine new states have been established in Mg30. The spin-polarization of Na30 enabled firm spin-parity assignments for seven states in Mg30 by means of the spatial asymmetry of β-ray counts in coincidence with the Mg30γ rays. Based on the experimental information, it is shown that various characteristic structures coexist in Mg30: (i) the ground-state vibrational-like band, (ii) the deformed band built on the 02+ state at 1.788 MeV, (iii) the γ-vibrational band built on the 23+ state at 3.543 MeV, and (iv) four states around 5 MeV associated with large β-transition probabilities: 1+ and 2+ states with spherical nature, 1+ and 2+ states with collective nature. The experimental results are compared with three theoretical calculations of the CHFB + LQRPA, the AMD + GCM, and the large-scale shell model with the EEdf1 interaction. All these theories reasonably reproduce the three bands.
AB - Structure of the neutron-rich nucleus Mg30, which is located close to the region of the N=20 "island of inversion,"has been investigated by β-γ spectroscopy of spin-polarized Na30. From the detailed γ-γ coincidence relations, nine new states have been established in Mg30. The spin-polarization of Na30 enabled firm spin-parity assignments for seven states in Mg30 by means of the spatial asymmetry of β-ray counts in coincidence with the Mg30γ rays. Based on the experimental information, it is shown that various characteristic structures coexist in Mg30: (i) the ground-state vibrational-like band, (ii) the deformed band built on the 02+ state at 1.788 MeV, (iii) the γ-vibrational band built on the 23+ state at 3.543 MeV, and (iv) four states around 5 MeV associated with large β-transition probabilities: 1+ and 2+ states with spherical nature, 1+ and 2+ states with collective nature. The experimental results are compared with three theoretical calculations of the CHFB + LQRPA, the AMD + GCM, and the large-scale shell model with the EEdf1 interaction. All these theories reasonably reproduce the three bands.
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U2 - 10.1103/PhysRevC.102.054327
DO - 10.1103/PhysRevC.102.054327
M3 - Article
AN - SCOPUS:85097179820
SN - 2469-9985
VL - 102
JO - Physical Review C
JF - Physical Review C
IS - 5
M1 - 054327
ER -