4.8 Article

γ-Ray Spectroscopy at the Limits: First Observation of Rotational Bands in 255Lr

Journal

PHYSICAL REVIEW LETTERS
Volume 102, Issue 21, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.212501

Keywords

-

Funding

  1. EU-FP6-I3 [506065]
  2. Academy of Finland [111965, 209430]
  3. E.C Marie Curie Fellowship
  4. UK EPSRC
  5. U.S. Department of Energy [DE-AC02-06CH11357]
  6. Slovak Research and Development Agency [APVV-20-006205]
  7. VEGA [1/4018/07]
  8. UK/France [EPSRC/IN2P3]
  9. CNRS/IN2P3
  10. Academy of Finland (AKA) [111965, 209430, 111965, 209430] Funding Source: Academy of Finland (AKA)
  11. Science and Technology Facilities Council [EP/D002257/1, ST/F012039/1] Funding Source: researchfish
  12. STFC [EP/D002257/1, ST/F012039/1] Funding Source: UKRI

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The rotational band structure of Lr-255 has been investigated using advanced in-beam gamma-ray spectroscopic techniques. To date, Lr-255 is the heaviest nucleus to be studied in this manner. One rotational band has been unambiguously observed and strong evidence for a second rotational structure was found. The structures are tentatively assigned to be based on the 1/2(-)[521] and 7/2(-)[514] Nilsson states, consistent with assignments from recently obtained alpha decay data. The experimental rotational band dynamic moment of inertia is used to test self-consistent mean-field calculations using the Skyrme SLy4 interaction and a density-dependent pairing force.

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