Merging of the island of inversion at N = 40 and N = 50
We performed a quantitative study of the nuclei with proton numbers from Z=20 (Ca) to Z=28 (Ni) and neutron numbers ranging from N=38 to 52 using the realistic shell model, which merged the descriptions of nuclei around N=40 and N=50 within an extended model space. The 21+ excitation energy (E(21+))...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-05-01
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| Series: | Physics Letters B |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269323002277 |
| _version_ | 1797843885693599744 |
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| author | J.G. Li |
| author_facet | J.G. Li |
| author_sort | J.G. Li |
| collection | DOAJ |
| description | We performed a quantitative study of the nuclei with proton numbers from Z=20 (Ca) to Z=28 (Ni) and neutron numbers ranging from N=38 to 52 using the realistic shell model, which merged the descriptions of nuclei around N=40 and N=50 within an extended model space. The 21+ excitation energy (E(21+)) is calculated for neutron-rich Cr, Fe, and Ni isotopes. The results suggest that the islands of inversion at N=40 and N=50 merge around the Cr chain, and the N=50 island of inversion is located below 78Ni. To demonstrate the prediction of the N=50 island of inversion, we calculated and compared the E(21+), B(E2;01+→21+), effective single-particle energies (ESPEs), the probability of particle-hole excitation, and the average occupations in the N=40 and N=50 isotones. Similar parabolic trends of E(21+) and B(E2;01+→21+) in the N=40 and 50 isotones are obtained. The calculated ESPEs give that the N=40 and N=50 shell gaps both increase with the variation of proton number from Z=20 (Ca) to Z=28 (Ni). However, our calculations indicate that different particle-hole excitations dominate in the ground states of the N=40 and N=50 islands of inversion, with 2p2h and 4p4h configurations being prominent in N=40 isotones, whereas 2p2h excitations are most important in the N=50 isotones. Furthermore, large occupations of the intruder quadrupole partner orbitals are also obtained in N=40 and N=50 isotones in our realistic shell model calculations. |
| first_indexed | 2024-04-09T17:13:25Z |
| format | Article |
| id | doaj.art-0cb1dd31bc704772b5b65b093d6941ac |
| institution | Directory Open Access Journal |
| issn | 0370-2693 |
| language | English |
| last_indexed | 2024-04-09T17:13:25Z |
| publishDate | 2023-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-0cb1dd31bc704772b5b65b093d6941ac2023-04-20T04:35:42ZengElsevierPhysics Letters B0370-26932023-05-01840137893Merging of the island of inversion at N = 40 and N = 50J.G. Li0CAS Key Laboratory of High Precision Nuclear Spectroscopy, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China; Correspondence to: CAS Key Laboratory of High Precision Nuclear Spectroscopy, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.We performed a quantitative study of the nuclei with proton numbers from Z=20 (Ca) to Z=28 (Ni) and neutron numbers ranging from N=38 to 52 using the realistic shell model, which merged the descriptions of nuclei around N=40 and N=50 within an extended model space. The 21+ excitation energy (E(21+)) is calculated for neutron-rich Cr, Fe, and Ni isotopes. The results suggest that the islands of inversion at N=40 and N=50 merge around the Cr chain, and the N=50 island of inversion is located below 78Ni. To demonstrate the prediction of the N=50 island of inversion, we calculated and compared the E(21+), B(E2;01+→21+), effective single-particle energies (ESPEs), the probability of particle-hole excitation, and the average occupations in the N=40 and N=50 isotones. Similar parabolic trends of E(21+) and B(E2;01+→21+) in the N=40 and 50 isotones are obtained. The calculated ESPEs give that the N=40 and N=50 shell gaps both increase with the variation of proton number from Z=20 (Ca) to Z=28 (Ni). However, our calculations indicate that different particle-hole excitations dominate in the ground states of the N=40 and N=50 islands of inversion, with 2p2h and 4p4h configurations being prominent in N=40 isotones, whereas 2p2h excitations are most important in the N=50 isotones. Furthermore, large occupations of the intruder quadrupole partner orbitals are also obtained in N=40 and N=50 isotones in our realistic shell model calculations.http://www.sciencedirect.com/science/article/pii/S0370269323002277Island of inversionRealistic shell modelExcitation energy of 21+Effective single-particle energyParticle-hole excitationAverage occupation |
| spellingShingle | J.G. Li Merging of the island of inversion at N = 40 and N = 50 Physics Letters B Island of inversion Realistic shell model Excitation energy of 21+ Effective single-particle energy Particle-hole excitation Average occupation |
| title | Merging of the island of inversion at N = 40 and N = 50 |
| title_full | Merging of the island of inversion at N = 40 and N = 50 |
| title_fullStr | Merging of the island of inversion at N = 40 and N = 50 |
| title_full_unstemmed | Merging of the island of inversion at N = 40 and N = 50 |
| title_short | Merging of the island of inversion at N = 40 and N = 50 |
| title_sort | merging of the island of inversion at n 40 and n 50 |
| topic | Island of inversion Realistic shell model Excitation energy of 21+ Effective single-particle energy Particle-hole excitation Average occupation |
| url | http://www.sciencedirect.com/science/article/pii/S0370269323002277 |
| work_keys_str_mv | AT jgli mergingoftheislandofinversionatn40andn50 |