4.5 Article

Isomeric states observed in heavy neutron-rich nuclei populated in the fragmentation of a 208Pb beam

Journal

PHYSICAL REVIEW C
Volume 84, Issue 4, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.84.044313

Keywords

-

Funding

  1. EPSRC (UK)
  2. AWE plc. (UK)
  3. EU (EURONS) [506065]
  4. Swedish Research Council
  5. Polish Ministry of Science and Higher Education
  6. Bulgarian Science Fund
  7. US Department of Energy [DE-FG02-91ER-40609]
  8. Spanish Ministerio de Ciencia e Innovacion [FPA2009-13377-C02-02]
  9. German BMBF
  10. Hungarian Science Foundation
  11. Italian INFN
  12. Science and Technology Facilities Council [ST/F012012/1, ST/J000132/1, EP/D003628/1, ST/F006950/1] Funding Source: researchfish
  13. STFC [ST/J000132/1, EP/D003628/1, ST/F012012/1, ST/F006950/1] Funding Source: UKRI
  14. Direct For Mathematical & Physical Scien
  15. Division Of Physics [1068217] Funding Source: National Science Foundation

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Heavy neutron-rich nuclei were populated via the fragmentation of a E/A = 1 GeV Pb-208(82) beam. Secondary fragments were separated and identified and subsequently implanted in a passive stopper. By the detection of delayed gamma rays, isomeric decays associated with these nuclei have been identified. A total of 49 isomers were detected, with the majority of them observed for the first time. The newly discovered isomers are in Hg-204,205(80), Au-201,202,204,205(79), Pt-197,203,204(78), Ir-195,199-203(77), Os-193,197-199(76), Re-196(75), W-190,191(74), and Ta-189(73). Possible level schemes are constructed and the structure of the nuclei discussed. To aid the interpretation, shell-model as well as BCS calculations were performed.

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