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Title: Evolution of structure and shapes in 158Er to ultrahigh spin

Journal Article · · Physical Review. C
ORCiD logo [1];  [2];  [2];  [3];  [4];  [3];  [5];  [6];  [1];  [7];  [3];  [3];  [6];  [8];  [9];  [3];  [10];  [10];  [3];  [10] more »;  [7];  [11];  [12];  [13];  [14];  [3];  [8];  [8];  [10];  [10]; ORCiD logo [15];  [16];  [17];  [18];  [19];  [3];  [20];  [3];  [21];  [10];  [8];  [22] « less
  1. STFC Daresbury Lab., Warrington (United Kingdom)
  2. Florida State Univ., Tallahassee, FL (United States)
  3. Univ. of Liverpool (United Kingdom)
  4. Florida State Univ., Tallahassee, FL (United States); California Polytechnic State Univ. (CalPoly), San Luis Obispo, CA (United States)
  5. Univ. of Zululand, KwaDlangezwa (South Africa)
  6. Florida State Univ., Tallahassee, FL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  7. Univ. of Notre Dame, IN (United States)
  8. Argonne National Lab. (ANL), Argonne, IL (United States)
  9. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Maryland, College Park, MD (United States); DEVCOM Army Research Lab., Adelphi, MD (United States)
  10. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  11. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of Oslo (Norway)
  12. U.S. Naval Academy, Annapolis, MD (United States)
  13. Univ. of North Carolina, Chapel Hill, NC (United States); Duke Univ., Durham, NC (United States)
  14. STFC Daresbury Lab., Warrington (United Kingdom); Univ. of Liverpool (United Kingdom)
  15. Univ. of Notre Dame, IN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  16. STFC Daresbury Lab., Warrington (United Kingdom); Rapiscan Systems, Stoke-on-Trent (United Kingdom)
  17. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of York (United Kingdom)
  18. Univ. of Liverpool (United Kingdom); Sellafield Ltd, Seascale (United Kingdom)
  19. Univ. of Tennessee, Knoxville, TN (United States)
  20. Florida State Univ., Tallahassee, FL (United States); Nuclear Regulatory Commission, Rockville, MD (United States)
  21. Univ. of Liverpool (United Kingdom); STFC Daresbury Lab., Warrington (United Kingdom)
  22. Lund Univ. (Sweden)
+ Show Author Affiliations

The level structure of 158Er has been studied using the Gammasphere spectrometer via the 114Cd(48Ca, 4$$n$$) reaction at 215 MeV with both thin (self-supporting) and thick (backed) targets. The level scheme has been considerably extended with more than 200 new transitions and six new rotational structures, including two strongly coupled high-$$K$$ bands. Configuration assignments for the new structures are based on their observed alignments, $B(M1)/B(E2)$ ratios of reduced transition probabilities, excitation energies, and comparisons with neighboring nuclei and theoretical calculations. With increasing angular momentum, this nucleus exhibits Coriolis-induced alignments of both neutrons and protons before it then undergoes a rotation-induced transition from near-prolate collective rotation to a noncollective oblate configuration. This transition occurs via the mechanism of band termination around spin $45ℏ$ in three rotational structures. Two distinct lifetime branches, consistent with the crossing of a collective “fast” rotational structure by an energetically favored “slow” terminating sequence, are confirmed for the positive-parity states, and similar behavior is established in the negative-parity states. Weak-intensity, high-energy transitions are observed to feed into the terminating states. At the highest spins, three collective bands with high dynamic moments of inertia and large quadrupole moments were identified. These bands are interpreted as triaxial strongly deformed structures and mark a return to collectivity at ultrahigh spin.

Research Organization:
University of North Carolina, Chapel Hill, NC (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE
Grant/Contract Number:
FG02-97ER41041; FG02-97ER41033; AC02-06CH11357; FG02-94ER40834; AC02-05CH11231; FG02-96ER40983; AC05-00OR22725
OSTI ID:
1973177
Alternate ID(s):
OSTI ID: 1973078; OSTI ID: 2216999; OSTI ID: 2328532; OSTI ID: 2377424
Journal Information:
Physical Review. C, Vol. 107, Issue 5; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
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spectrometers & spectroscopic techniques