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Resonant structure of 18Na and the N = 8 shell

Journal Article · · Physical Review. C
DOI:https://doi.org/10.1103/vktj-1wkr· OSTI ID:3000765
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  1. Peking University, Beijing (China)
  2. Michigan State Univ., East Lansing, MI (United States)
  3. Michigan State Univ., East Lansing, MI (United States); High Point Univ., High Point, NC (United States)
  4. Washington Univ., St. Louis, MO (United States)
  5. Michigan State Univ., East Lansing, MI (United States); Univ. of Naples Federico II (Italy)
  6. University of Chinese Academy of Sciences, Beijing (China)
  7. Fudan Univ., Shanghai (China)
  8. Sun Yat-Sen Univ. (China)
+ Show Author Affiliations
The resonant structure of the proton-unbound nucleus 18Na has been studied via knockout reactions of a 20Mg beam on a 9Be target. Three resonant states in 18Na are identified through the invariant-mass reconstruction of 17Ne+1⁒𝑝 events, including the 1$$^βˆ’_1$$ ground state with one-proton decay energy of 1.38(2) MeV. In comparison with the low-lying states in the mirror neutron-rich nucleus 18N, the 1$$^βˆ’_1$$ ground state and 2$$^βˆ’_1$$ excited state with πœ‹β’(1⁒𝑑5/2)3 βŠ— 𝜈⁒1⁒𝑝1/2 configurations in 18Na likely correspond to different proton seniorities, 𝜈=3 and 1, respectively, while the 0$$^βˆ’_1$$ and 1$$^βˆ’_2$$ states with πœ‹β’(1⁒𝑑5/2)2⁒(2⁒𝑠1/2) βŠ— 𝜈⁒1⁒𝑝1/2 configuration show obvious Thomas-Ehrman shifts. With the more-precise atomic mass of 18Na, the one-neutron separation energy 𝑆𝑛⁑(19Na)=20.31⁒(2)⁒MeV is derived. Based on the systematics of the differences in experimental one-neutron separation energy in the isotopic chains from 𝑍=9 to 12, the shell effects at 𝑁=8 for proton-rich nuclei are discussed.
Research Organization:
Washington Univ., St. Louis, MO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
FG02-87ER40316
OSTI ID:
3000765
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 2 Vol. 112; ISSN 2469-9985; ISSN 2469-9993
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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