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Title: Light charged particles as gateway to hyperdeformation

Abstract

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 E beam = 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 ℏ 2 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) = 71-77ℏ 2 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.

Authors:
 [1];  [1];  [1];  [1];  [2];  [1];  [3];  [4];  [4];  [4];  [4];  [4];  [4];  [4];  [5];  [5];  [5];  [5];  [5];  [5] more »;  [5];  [5];  [5];  [6];  [7];  [7];  [7];  [7];  [7];  [7];  [7];  [7];  [8];  [8];  [8];  [8];  [8];  [8];  [8];  [8];  [8];  [8];  [8];  [8];  [9];  [10];  [10];  [10];  [11];  [11];  [11];  [11];  [11];  [12];  [12];  [12];  [13];  [13];  [13];  [13];  [13];  [14];  [15];  [15];  [16];  [16];  [17];  [18];  [18];  [19];  [19];  [20];  [20];  [21];  [22];  [22] « less
  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)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1407056
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Acta Physica Polonica. Series B
Additional Journal Information:
Journal Volume: 38; Journal Issue: 4; Journal ID: ISSN 0587-4254
Publisher:
Jagiellonian University
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Herskind, B., Hagbmann, G. B., Døssing, T., Rønn Hansen, C., Schunck, N., Sletten, G., Ødegard, S., Hübel, H., Bringel, P., Bürger, A., Neusser, A., Singh, A. K., Al-Khatib, A., Patel, S. B., Nyakó, B. M., Algora, A., Dombrádi, Z., Gál, J., Kalinka, G., Sohler, D., Molnár, J., Timár, J., Zolnai, L., Juhász, K., Bracco, A., Leoni, S., Camera, F., Benzoni, G., Mason, P., Paleni, A., Million, B., Wieland, O., Bednarczyk, P., Azaiez, F., Byrski, T., Curien, D., Dakov, O., Duchene, G., Khalfallah, F., Gall, B., Piqeras, L., Robin, J., Dudek, J., Rowley, N., Redon, N., Hannachi, F., Scheurer, J. N., Wilson, J. N., Lopez-Martens, A., Korichi, A., Hauschild, K., Roccaz, J., Siem, S., Fallon, P., Lee, I. Y., Gorgen, A., Maj, A., Kmiecik, M., Brekiesz, M., Styczen, J., Zuber, K., Lisle, J. C., Cederwall, B., Lagergren, K., Evans, A. O., Rainovski, G., De Angelis, G., La Rana, G., Moro, R., Lieder, R. M., Lieder, E. O., Gast, W., Jäger, H., Pasternak, A. A., Petrache, C. M., and Petrache, D. Light charged particles as gateway to hyperdeformation. United States: N. p., 2007. Web.
Herskind, B., Hagbmann, G. B., Døssing, T., Rønn Hansen, C., Schunck, N., Sletten, G., Ødegard, S., Hübel, H., Bringel, P., Bürger, A., Neusser, A., Singh, A. K., Al-Khatib, A., Patel, S. B., Nyakó, B. M., Algora, A., Dombrádi, Z., Gál, J., Kalinka, G., Sohler, D., Molnár, J., Timár, J., Zolnai, L., Juhász, K., Bracco, A., Leoni, S., Camera, F., Benzoni, G., Mason, P., Paleni, A., Million, B., Wieland, O., Bednarczyk, P., Azaiez, F., Byrski, T., Curien, D., Dakov, O., Duchene, G., Khalfallah, F., Gall, B., Piqeras, L., Robin, J., Dudek, J., Rowley, N., Redon, N., Hannachi, F., Scheurer, J. N., Wilson, J. N., Lopez-Martens, A., Korichi, A., Hauschild, K., Roccaz, J., Siem, S., Fallon, P., Lee, I. Y., Gorgen, A., Maj, A., Kmiecik, M., Brekiesz, M., Styczen, J., Zuber, K., Lisle, J. C., Cederwall, B., Lagergren, K., Evans, A. O., Rainovski, G., De Angelis, G., La Rana, G., Moro, R., Lieder, R. M., Lieder, E. O., Gast, W., Jäger, H., Pasternak, A. A., Petrache, C. M., & Petrache, D. Light charged particles as gateway to hyperdeformation. United States.
Herskind, B., Hagbmann, G. B., Døssing, T., Rønn Hansen, C., Schunck, N., Sletten, G., Ødegard, S., Hübel, H., Bringel, P., Bürger, A., Neusser, A., Singh, A. K., Al-Khatib, A., Patel, S. B., Nyakó, B. M., Algora, A., Dombrádi, Z., Gál, J., Kalinka, G., Sohler, D., Molnár, J., Timár, J., Zolnai, L., Juhász, K., Bracco, A., Leoni, S., Camera, F., Benzoni, G., Mason, P., Paleni, A., Million, B., Wieland, O., Bednarczyk, P., Azaiez, F., Byrski, T., Curien, D., Dakov, O., Duchene, G., Khalfallah, F., Gall, B., Piqeras, L., Robin, J., Dudek, J., Rowley, N., Redon, N., Hannachi, F., Scheurer, J. N., Wilson, J. N., Lopez-Martens, A., Korichi, A., Hauschild, K., Roccaz, J., Siem, S., Fallon, P., Lee, I. Y., Gorgen, A., Maj, A., Kmiecik, M., Brekiesz, M., Styczen, J., Zuber, K., Lisle, J. C., Cederwall, B., Lagergren, K., Evans, A. O., Rainovski, G., De Angelis, G., La Rana, G., Moro, R., Lieder, R. M., Lieder, E. O., Gast, W., Jäger, H., Pasternak, A. A., Petrache, C. M., and Petrache, D. Sun . "Light charged particles as gateway to hyperdeformation". United States. https://www.osti.gov/servlets/purl/1407056.
@article{osti_1407056,
title = {Light charged particles as gateway to hyperdeformation},
author = {Herskind, B. and Hagbmann, G. B. and Døssing, T. and Rønn Hansen, C. and Schunck, N. and Sletten, G. and Ødegard, S. and Hübel, H. and Bringel, P. and Bürger, A. and Neusser, A. and Singh, A. K. and Al-Khatib, A. and Patel, S. B. and Nyakó, B. M. and Algora, A. and Dombrádi, Z. and Gál, J. and Kalinka, G. and Sohler, D. and Molnár, J. and Timár, J. and Zolnai, L. and Juhász, K. and Bracco, A. and Leoni, S. and Camera, F. and Benzoni, G. and Mason, P. and Paleni, A. and Million, B. and Wieland, O. and Bednarczyk, P. and Azaiez, F. and Byrski, T. and Curien, D. and Dakov, O. and Duchene, G. and Khalfallah, F. and Gall, B. and Piqeras, L. and Robin, J. and Dudek, J. and Rowley, N. and Redon, N. and Hannachi, F. and Scheurer, J. N. and Wilson, J. N. and Lopez-Martens, A. and Korichi, A. and Hauschild, K. and Roccaz, J. and Siem, S. and Fallon, P. and Lee, I. Y. and Gorgen, A. and Maj, A. and Kmiecik, M. and Brekiesz, M. and Styczen, J. and Zuber, K. and Lisle, J. C. and Cederwall, B. and Lagergren, K. and Evans, A. O. and Rainovski, G. and De Angelis, G. and La Rana, G. and Moro, R. and Lieder, R. M. and Lieder, E. O. and Gast, W. and Jäger, H. and Pasternak, A. A. and Petrache, C. M. and Petrache, D.},
abstractNote = {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.},
doi = {},
journal = {Acta Physica Polonica. Series B},
number = 4,
volume = 38,
place = {United States},
year = {2007},
month = {4}
}

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