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Title: Direct evidence of octupole deformation in neutron-rich 144Ba

Abstract

©=0.65(+17-23) eb3/2, corresponds to a reduced B(E3) transition probability of 48(+25-34) W.u. This result represents an unambiguous determination of the octupole collectivity, is larger than any available theoretical prediction, and is consistent with octupole deformation. © 2016 American Physical Society. The neutron-rich nucleus Ba144 (t1/2=11.5 s) is expected to exhibit some of the strongest octupole correlations among nuclei with mass numbers A less than 200. Until now, indirect evidence for such strong correlations has been inferred from observations such as enhanced E1 transitions and interleaving positive- and negative-parity levels in the ground-state band. In this experiment, the octupole strength was measured directly by sub-barrier, multistep Coulomb excitation of a post-accelerated 650-MeV Ba144 beam on a 1.0-mg/cm2 Pb208 target. The measured value of the matrix element, 31-M(E3)01+

Authors:
 [1];  [2];  [1];  [2];  [3];  [3];  [2];  [2];  [4];  [5];  [2];  [6];  [2];  [7];  [5];  [2];  [8];  [2];  [6];  [2] more »;  [2];  [9];  [2];  [5];  [2];  [7];  [10];  [2];  [11];  [2];  [12];  [5];  [2] « less
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Univ. of Rochester, Rochester, NY (United States)
  4. Univ. of Liverpool, Liverpool (United Kingdom)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  6. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Maryland, College Park, MD (United States)
  7. Ohio Univ., Athens, OH (United States)
  8. Univ. of West of Scotland, Paisley (United Kingdom); Scottish Univ. Physics Alliance, Glasgow (United Kingdom)
  9. Argonne National Lab. (ANL), Argonne, IL (United States); IN2P3-CNRS, Orsay Campus (France)
  10. Florida State Univ., Tallahassee, FL (United States)
  11. Univ. of the West of Scotland, Paisley (United Kingdom); Scottish Univ., Physics Alliance, Glasgow (United Kingdom)
  12. Univ. of Notre Dame, Notre Dame, IN (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science - Office of Nuclear Physics; National Science Foundation (NSF)
OSTI Identifier:
1260475
Alternate Identifier(s):
OSTI ID: 1242331; OSTI ID: 1379235; OSTI ID: 1392459
Report Number(s):
LLNL-JRNL-676868
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:  
AC52-07NA27344; AC02-06CH11357; AC02-05CH11231; FG02-94ER40834
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 116; Journal Issue: 11; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Bucher, B., Zhu, S., Wu, C. Y., Janssens, R. V. F., Cline, D., Hayes, A. B., Albers, M., Ayangeakaa, A. D., Butler, P. A., Campbell, C. M., Carpenter, M. P., Chiara, C. J., Clark, J., Crawford, H. L., Cromaz, M., David, H. M., Gregor, E. T., Kondev, F. G., Harker, J., Hoffman, C. R., Kay, B. P., Korichi, A., Lauritsen, T., Macchiavelli, A. O., Pardo, R. C., Richard, A., Riley, M. A., Savard, G., Scheck, M., Seweryniak, D., Smith, M. K., Wiens, A., and Vondrasek, R. Direct evidence of octupole deformation in neutron-rich 144Ba. United States: N. p., 2016. Web. doi:10.1103/PhysRevLett.116.112503.
Bucher, B., Zhu, S., Wu, C. Y., Janssens, R. V. F., Cline, D., Hayes, A. B., Albers, M., Ayangeakaa, A. D., Butler, P. A., Campbell, C. M., Carpenter, M. P., Chiara, C. J., Clark, J., Crawford, H. L., Cromaz, M., David, H. M., Gregor, E. T., Kondev, F. G., Harker, J., Hoffman, C. R., Kay, B. P., Korichi, A., Lauritsen, T., Macchiavelli, A. O., Pardo, R. C., Richard, A., Riley, M. A., Savard, G., Scheck, M., Seweryniak, D., Smith, M. K., Wiens, A., & Vondrasek, R. Direct evidence of octupole deformation in neutron-rich 144Ba. United States. doi:10.1103/PhysRevLett.116.112503.
Bucher, B., Zhu, S., Wu, C. Y., Janssens, R. V. F., Cline, D., Hayes, A. B., Albers, M., Ayangeakaa, A. D., Butler, P. A., Campbell, C. M., Carpenter, M. P., Chiara, C. J., Clark, J., Crawford, H. L., Cromaz, M., David, H. M., Gregor, E. T., Kondev, F. G., Harker, J., Hoffman, C. R., Kay, B. P., Korichi, A., Lauritsen, T., Macchiavelli, A. O., Pardo, R. C., Richard, A., Riley, M. A., Savard, G., Scheck, M., Seweryniak, D., Smith, M. K., Wiens, A., and Vondrasek, R. Thu . "Direct evidence of octupole deformation in neutron-rich 144Ba". United States. doi:10.1103/PhysRevLett.116.112503. https://www.osti.gov/servlets/purl/1260475.
@article{osti_1260475,
title = {Direct evidence of octupole deformation in neutron-rich 144Ba},
author = {Bucher, B. and Zhu, S. and Wu, C. Y. and Janssens, R. V. F. and Cline, D. and Hayes, A. B. and Albers, M. and Ayangeakaa, A. D. and Butler, P. A. and Campbell, C. M. and Carpenter, M. P. and Chiara, C. J. and Clark, J. and Crawford, H. L. and Cromaz, M. and David, H. M. and Gregor, E. T. and Kondev, F. G. and Harker, J. and Hoffman, C. R. and Kay, B. P. and Korichi, A. and Lauritsen, T. and Macchiavelli, A. O. and Pardo, R. C. and Richard, A. and Riley, M. A. and Savard, G. and Scheck, M. and Seweryniak, D. and Smith, M. K. and Wiens, A. and Vondrasek, R.},
abstractNote = {©=0.65(+17-23) eb3/2, corresponds to a reduced B(E3) transition probability of 48(+25-34) W.u. This result represents an unambiguous determination of the octupole collectivity, is larger than any available theoretical prediction, and is consistent with octupole deformation. © 2016 American Physical Society. The neutron-rich nucleus Ba144 (t1/2=11.5 s) is expected to exhibit some of the strongest octupole correlations among nuclei with mass numbers A less than 200. Until now, indirect evidence for such strong correlations has been inferred from observations such as enhanced E1 transitions and interleaving positive- and negative-parity levels in the ground-state band. In this experiment, the octupole strength was measured directly by sub-barrier, multistep Coulomb excitation of a post-accelerated 650-MeV Ba144 beam on a 1.0-mg/cm2 Pb208 target. The measured value of the matrix element, 31-M(E3)01+},
doi = {10.1103/PhysRevLett.116.112503},
journal = {Physical Review Letters},
number = 11,
volume = 116,
place = {United States},
year = {2016},
month = {3}
}

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Cited by: 31 works
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    Works referencing / citing this record:

    Analytical description of shape transition in nuclear alternating parity bands
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    Impact of pear-shaped fission fragments on mass-asymmetric fission in actinides
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    Direct Evidence for Octupole Deformation in Ba 146 and the Origin of Large E 1 Moment Variations in Reflection-Asymmetric Nuclei
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    Coexistence of Reflection Asymmetric and Symmetric Shapes in Ba 144
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