Direct evidence of octupole deformation in neutron-rich 144Ba

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.

doi:10.1103/PhysRevLett.116.112503

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

Journal Article · Thu Mar 17 00:00:00 EDT 2016 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.116.112503· OSTI ID:1260475

Bucher, B. ^[1]; Zhu, S. ^[2]; Wu, C. Y. ^[1]; Janssens, R. V. F. ^[2]; Cline, D. ^[3]; Hayes, A. B. ^[3]; Albers, M. ^[2]; Ayangeakaa, A. D. ^[2]; Butler, P. A. ^[4]; Campbell, C. M. ^[5]; Carpenter, M. P. ^[2]; Chiara, C. J. ^[6]; Clark, J. ^[2]; Crawford, H. L. ^[7]; Cromaz, M. ^[5]; David, H. M. ^[2]; Gregor, E. T. ^[8]; Kondev, F. G. ^[2]; Harker, J. ^[6]; Hoffman, C. R. ^[2] more »

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Rochester, Rochester, NY (United States)
Univ. of Liverpool, Liverpool (United Kingdom)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Maryland, College Park, MD (United States)
Ohio Univ., Athens, OH (United States)
Univ. of West of Scotland, Paisley (United Kingdom); Scottish Univ. Physics Alliance, Glasgow (United Kingdom)
Argonne National Lab. (ANL), Argonne, IL (United States); IN2P3-CNRS, Orsay Campus (France)
Florida State Univ., Tallahassee, FL (United States)
Univ. of the West of Scotland, Paisley (United Kingdom); Scottish Univ., Physics Alliance, Glasgow (United Kingdom)
Univ. of Notre Dame, Notre Dame, IN (United States)

©=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+

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Research Organization:: 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 Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science - Office of Nuclear Physics; National Science Foundation (NSF)

Grant/Contract Number:: AC52-07NA27344; AC02-06CH11357; AC02-05CH11231; FG02-94ER40834

OSTI ID:: 1260475

Alternate ID(s):: OSTI ID: 1242331; OSTI ID: 1379235; OSTI ID: 1392459

Report Number(s):: LLNL-JRNL-676868; PRLTAO

Journal Information:: Physical Review Letters, Vol. 116, Issue 11; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 104 works

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Microscopic core-quasiparticle coupling model for spectroscopy of odd-mass nuclei with octupole correlations Sun, W.; Quan, S.; Li, Z. P. Physical Review C, Vol. 100, Issue 4 https://doi.org/10.1103/physrevc.100.044319	journal	October 2019
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Title: Direct evidence of octupole deformation in neutron-rich ¹⁴⁴Ba