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Title: Isomeric Character of the Lowest Observed 4 + State in S 44

Journal Article · · Physical Review Letters
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  1. Florida State Univ., Tallahassee, FL (United States). Dept. of Physics
  2. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab., Dept. of Physics and Astronomy
  3. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
  4. National Heavy Ion Accelerator (GANIL), Caen (France)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Division
  6. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.; Central Michigan Univ., Mount Pleasant, MI (United States). Dept. of Physics

Previous experiments observed a 4+ state in the N=28 nucleus S44 and suggested that this state may exhibit a hindered E2-decay rate, inconsistent with being a member of the collective ground state band. We populate this state via two-proton knockout from a beam of exotic Ar46 projectiles and measure its lifetime using the recoil distance method with the GRETINA γ-ray spectrometer. The result, 76(14)stat(20)syst ps, implies a hindered transition of B(E2;4+→2$$+\atop{1}$$)=0.61(19) single-particle or Weisskopf units strength and supports the interpretation of the 4+ state as a K=4 isomer, the first example of a high-K isomer in a nucleus of such low mass.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC02-05CH11231; NA0000979; PHY-1064819; PHY-1401574; PHY-1102511
OSTI ID:
1379702
Alternate ID(s):
OSTI ID: 1341936
Journal Information:
Physical Review Letters, Vol. 118, Issue 5; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 10 works
Citation information provided by
Web of Science

References (17)

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journal January 2009
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