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Light charged particles as gateway to hyperdeformation

Journal Article · · Acta Physica Polonica. Series B
OSTI ID:1407056
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  1. Univ. of Copenhagen (Denmark). The Niels Bohr Inst.
  2. Univ. of Copenhagen (Denmark). The Niels Bohr Inst.; Univ. Autonoma de Madrid (Spain)
  3. Univ. of Copenhagen (Denmark). The Niels Bohr Inst.; Univ. of Oslo (Norway)
  4. Univ. of Bonn (Germany)
  5. MTA Atomki, Debrecen (Hungary)
  6. Univ. of Debrecen (Hungary)
  7. Univ. di Milano (Italy); Istituto Nazionale di Fisica Nucleare (INFN), Milano (Italy)
  8. CNRS/IN2P3, Strasbourg (France)
  9. CNRS/IN2P3, Lyon (France)
  10. CENBG, Bordeaux-Gradignan (France)
  11. CNRS/IN2P3, Orsay (France)
  12. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  13. Inst. of Nuclear Physics (PAN), Krakow (Poland)
  14. Univ. of Manchester (United Kingdom)
  15. KTH Royal Inst. of Technology, Stockholm (Sweden)
  16. Univ. of Liverpool (United Kingdom)
  17. Istituto Nazionale di Fisica Nucleare (INFN), Legnaro (Italy)
  18. Univ. di Napli (Italy); Istituto Nazionale di Fisica Nucleare (INFN), Milano (Italy)
  19. iThemba LABS, Sommerset West (South Africa)
  20. Forschungszentrum Julich (Germany)
  21. Russian Academy of Sciences (RAS), St. Petersburg (Russian Federation). Ioffe Physical Technical Inst.
  22. Univ. of Camerino (Italy)
+ Show Author Affiliations
The Euroball-IV γ-detector array, equipped with the ancillary charged particle detector array DIAMANT was used to study the residues of the fusion reaction 64Ni + 64Ni → 128Ba at Ebeam = 255 and 261 MeV, in an attempt to reach the highest anguar momentum and verify the existence of predicted hyperdeformed rotational bands. No discrete hyperdeformed bands were identified, but nevertheless a breakthrough was obtained a systematic search for rotational ridge structure with very large moments of inertia J (2) ≥ 100 ℏ2 MeV(-1) , in agreement with theoretical predictions for hyperdeformed shapes. Evidence for hyperdeformiation was obtained by charged particle + γ-ray gating, selectiong triple correlated ridge structures in the continuum of each of the nuclei, 118Te, 124Xe and 124,125Cs. In 7 additional nuclei, rotational ridges were also identified with J(2) = 71-77ℏ2 Mev(-1) , which most probably correspond to surperdeformed shape. The angular distributions of the emitted charged particles show an excess in forward direction over expectations from pure compound evaporation, which may indicate that in-complete fusion plays an important role in the population of very elongated shapes.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1407056
Journal Information:
Acta Physica Polonica. Series B, Journal Name: Acta Physica Polonica. Series B Journal Issue: 4 Vol. 38; ISSN 0587-4254
Publisher:
Jagiellonian UniversityCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS