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Low-lying isomeric levels in 75Cu

Journal Article · · Physical Review C
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  1. Grand Accelerateur National d'Ions Lourds (GANIL)
  2. CEA, France
  3. GSI-Hemholtzzentrum fur Schwerionenforschung, Darmstadt, Germany
  4. University of Warsaw
  5. University of Tennessee, Knoxville (UTK)
  6. CNRS/IN2P3, Caen, France
  7. Nuclear Physic Institute, Czech Republic
  8. Universite de Lyon, France
  9. IFIN, Bucharest-Magurele, Romania
  10. University of Surrey, UK
  11. Daresbury Laboratory, UK
  12. ORNL
  13. Technische Universitat Darmstadt, Germany
  14. Institut Pluridisciplinaire Hubert Curien, Strasbourg, France
+ Show Author Affiliations
Isomeric low-lying states were identified and investigated in the 75Cu nucleus. Two states at 61.8(5)- and 128.3(7)-keV excitation energies with half-lives of 370(40)- and 170(15)-ns were assigned as 75m1Cu and 75m2Cu, respectively. The measured half-lives combined with the recent spin assignment of the ground state allow one to deduce tentatively spin and parity of the two isomers and the dominant multipolarities of the isomeric transitions with respect to the systematics of the Cu isotopes. Shell-model calculations using an up-to-date effective interaction reproduce the evolution of the 1/2 , 3/2 , and 5/2 states for the neutron-rich odd-mass Cu isotopes when filling the g9/2. The results indicate a significant change in the nuclear structure in this region, where a single-particle 5/2 state coexists with more and more collective 3/2 and 1/2 levels at low excitation energies.
Research Organization:
Oak Ridge National Laboratory (ORNL); Holifield Radioactive Ion Beam Facility
Sponsoring Organization:
SC USDOE - Office of Science (SC)
DOE Contract Number:
AC05-00OR22725
OSTI ID:
974642
Journal Information:
Physical Review C, Journal Name: Physical Review C Journal Issue: 3 Vol. 81; ISSN 0556-2813
Country of Publication:
United States
Language:
English

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Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
EXCITATION
GROUND STATES
ISOMERIC TRANSITIONS
ISOMERS
NUCLEAR STRUCTURE
PARITY
SPIN