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Title: Using spin alignment of inelastically excited nuclei in fast beams to assign spins: The spectroscopy of 13O as a test case

Journal Article · · Physical Review C
ORCiD logo [1];  [1];  [1];  [2];  [2];  [1];  [3];  [4];  [5];  [5];  [6];  [6];  [6];  [6];  [7];  [6];  [6];  [6];  [6];  [6] more »;  [6];  [8];  [9];  [9];  [9];  [10] « less
  1. Washington Univ., St. Louis, MO (United States)
  2. Washington Univ., St. Louis, MO (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. TRIUMF, Vancouver, BC (Canada)
  4. Universite Paris-Saclay, Orsay (France). IJCLab; Centre National de la Recherche Scientifique (CNRS), Paris (France). Inst. National de Physique Nucleaire et de Physique des Particules (IN2P3)
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  6. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
  7. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.; Air Force Institute of Technology, Wright-Patterson AFB, OH (United States)
  8. Univ. of Connecticut, Storrs, CT (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  9. Univ. of Connecticut, Storrs, CT (United States)
  10. Western Michigan Univ., Kalamazoo MI (United States)
+ Show Author Affiliations

Excited states in O 13 were investigated using inelastic scattering of an E / A = 69.5 MeV O 13 beam off of a Be 9 target. The excited states were identified in the invariant-mass spectra of the decay products. Both single-proton and sequential two-proton decays of the excited states were examined. Furthermore, for a number of the excited states, the protons were emitted with strong anisotropy where emissions transverse to the beam axis are favored. The measured proton-decay angular distributions were compared to predictions from distorted-wave Born-approximation calculations of the spin alignment which was shown to be largely independent of the excitation mechanism. The deduced O 13 level scheme is compared to ab initio no-core shell model with continuum predictions. The lowest-energy excited states decay isotropically consistent with predictions of strong proton 1 s 1 / 2 structure. Above these states in the level scheme, we observed a number of higher-spin states not predicted within the model. Possibly these are associated with rotational bands built on deformed cluster configurations predicted by antisymmetrized molecular dynamics calculations. The spin alignment mechanism is shown to be useful for making spin assignments and may have widespread use.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
NSERC; National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC52-07NA27344; FG02-04ER41320; FG02-87ER40316; NA0002135; SC0013365; SC0014552
OSTI ID:
1821280
Report Number(s):
LLNL-JRNL--823932; 1037110
Journal Information:
Physical Review C, Journal Name: Physical Review C Journal Issue: 2 Vol. 104; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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