Direct Evidence of Octupole Deformation in Neutron-Rich Ba 144
The neutron-rich nucleus Ba-144 (t(1/2) = 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 inter...
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| creator | 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. A. Crawford, H. L. Cromaz, M. David, H. M. Dickerson, C. Gregor, E. T. Harker, J. Hoffman, C. R. Kay, B. P. Kondev, F. G. Korichi, A. Lauritsen, T. Macchiavelli, A. O. Pardo, R. C. Richard, A. Riley, M. A. Savard, G. Scheck, M. Seweryniak, D. Smith, M. K. Vondrasek, R. Wiens, A. |
| description | The neutron-rich nucleus Ba-144 (t(1/2) = 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 Ba-144 beam on a 1.0-mg/cm(2) Pb-208 target. The measured value of the matrix element, < 3(1)(-)parallel to M(E3)parallel to 0(1)(+)> = 0.65((+17)(-23)) eb(3/2,) corresponds to a reduced Bd(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. |
| doi_str_mv | 10.1103/PhysRevLett.116.112503 |
| format | Article |
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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. A. ; Crawford, H. L. ; Cromaz, M. ; David, H. M. ; Dickerson, C. ; Gregor, E. T. ; Harker, J. ; Hoffman, C. R. ; Kay, B. P. ; Kondev, F. G. ; Korichi, A. ; Lauritsen, T. ; Macchiavelli, A. O. ; Pardo, R. C. ; Richard, A. ; Riley, M. A. ; Savard, G. ; Scheck, M. ; Seweryniak, D. ; Smith, M. K. ; Vondrasek, R. ; Wiens, A.</creator><creatorcontrib>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. A. ; Crawford, H. L. ; Cromaz, M. ; David, H. M. ; Dickerson, C. ; Gregor, E. T. ; Harker, J. ; Hoffman, C. R. ; Kay, B. P. ; Kondev, F. G. ; Korichi, A. ; Lauritsen, T. ; Macchiavelli, A. O. ; Pardo, R. C. ; Richard, A. ; Riley, M. A. ; Savard, G. ; Scheck, M. ; Seweryniak, D. ; Smith, M. K. ; Vondrasek, R. ; Wiens, A.</creatorcontrib><description>The neutron-rich nucleus Ba-144 (t(1/2) = 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 Ba-144 beam on a 1.0-mg/cm(2) Pb-208 target. The measured value of the matrix element, < 3(1)(-)parallel to M(E3)parallel to 0(1)(+)> = 0.65((+17)(-23)) eb(3/2,) corresponds to a reduced Bd(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.</description><identifier>ISSN: 0031-9007</identifier><identifier>EISSN: 1079-7114</identifier><identifier>DOI: 10.1103/PhysRevLett.116.112503</identifier><language>eng</language><publisher>American Physical Society</publisher><subject>Nuclear Experiment ; Physics</subject><ispartof>Physical review letters, 2016-03, Vol.116 (11), Article 112503</ispartof><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c291t-3ae15d673e912c6a00c862a85e06756c46de30456031ceb1ef5509d08d84b1703</citedby><cites>FETCH-LOGICAL-c291t-3ae15d673e912c6a00c862a85e06756c46de30456031ceb1ef5509d08d84b1703</cites><orcidid>0000-0002-6468-8292</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,776,780,881,2863,2864,27901,27902</link.rule.ids><backlink>$$Uhttps://in2p3.hal.science/in2p3-01303476$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Bucher, B.</creatorcontrib><creatorcontrib>Zhu, S.</creatorcontrib><creatorcontrib>Wu, C. Y.</creatorcontrib><creatorcontrib>Janssens, R. V. F.</creatorcontrib><creatorcontrib>Cline, D.</creatorcontrib><creatorcontrib>Hayes, A. B.</creatorcontrib><creatorcontrib>Albers, M.</creatorcontrib><creatorcontrib>Ayangeakaa, A. D.</creatorcontrib><creatorcontrib>Butler, P. A.</creatorcontrib><creatorcontrib>Campbell, C. M.</creatorcontrib><creatorcontrib>Carpenter, M. P.</creatorcontrib><creatorcontrib>Chiara, C. J.</creatorcontrib><creatorcontrib>Clark, J. A.</creatorcontrib><creatorcontrib>Crawford, H. L.</creatorcontrib><creatorcontrib>Cromaz, M.</creatorcontrib><creatorcontrib>David, H. M.</creatorcontrib><creatorcontrib>Dickerson, C.</creatorcontrib><creatorcontrib>Gregor, E. T.</creatorcontrib><creatorcontrib>Harker, J.</creatorcontrib><creatorcontrib>Hoffman, C. R.</creatorcontrib><creatorcontrib>Kay, B. P.</creatorcontrib><creatorcontrib>Kondev, F. G.</creatorcontrib><creatorcontrib>Korichi, A.</creatorcontrib><creatorcontrib>Lauritsen, T.</creatorcontrib><creatorcontrib>Macchiavelli, A. O.</creatorcontrib><creatorcontrib>Pardo, R. C.</creatorcontrib><creatorcontrib>Richard, A.</creatorcontrib><creatorcontrib>Riley, M. A.</creatorcontrib><creatorcontrib>Savard, G.</creatorcontrib><creatorcontrib>Scheck, M.</creatorcontrib><creatorcontrib>Seweryniak, D.</creatorcontrib><creatorcontrib>Smith, M. K.</creatorcontrib><creatorcontrib>Vondrasek, R.</creatorcontrib><creatorcontrib>Wiens, A.</creatorcontrib><title>Direct Evidence of Octupole Deformation in Neutron-Rich Ba 144</title><title>Physical review letters</title><description>The neutron-rich nucleus Ba-144 (t(1/2) = 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 Ba-144 beam on a 1.0-mg/cm(2) Pb-208 target. The measured value of the matrix element, < 3(1)(-)parallel to M(E3)parallel to 0(1)(+)> = 0.65((+17)(-23)) eb(3/2,) corresponds to a reduced Bd(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.</description><subject>Nuclear Experiment</subject><subject>Physics</subject><issn>0031-9007</issn><issn>1079-7114</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNpNkF9Lw0AQxA9RsFa_gty7RHdzf5K8CLWtVghWij4f18uGnqS5ckkL_fZGKuLDMjDMDMuPsVuEe0QQD--bY7eiQ0l9Pxh6uFSBOGMjhKxIMkR5zkYAApMCILtkV133BQCY6nzEHmc-kuv5_OArah3xUPOl6_e70BCfUR3i1vY-tNy3_I32fQxtsvJuw58sRymv2UVtm45ufnXMPp_nH9NFUi5fXqeTMnFpgX0iLKGqdCaowNRpC-ByndpcEehMaSd1RQKk0sOXjtZItVJQVJBXuVxjBmLM7k67G9uYXfRbG48mWG8Wk9L4Nt0JAyhAyEwfcEjrU9rF0HWR6r8KgvlhZv4xGwxtTszENxo_X5Q</recordid><startdate>20160317</startdate><enddate>20160317</enddate><creator>Bucher, B.</creator><creator>Zhu, S.</creator><creator>Wu, C. Y.</creator><creator>Janssens, R. V. 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K.</creator><creator>Vondrasek, R.</creator><creator>Wiens, A.</creator><general>American Physical Society</general><scope>AAYXX</scope><scope>CITATION</scope><scope>1XC</scope><orcidid>https://orcid.org/0000-0002-6468-8292</orcidid></search><sort><creationdate>20160317</creationdate><title>Direct Evidence of Octupole Deformation in Neutron-Rich Ba 144</title><author>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. A. ; Crawford, H. L. ; Cromaz, M. ; David, H. M. ; Dickerson, C. ; Gregor, E. T. ; Harker, J. ; Hoffman, C. R. ; Kay, B. P. ; Kondev, F. G. ; Korichi, A. ; Lauritsen, T. ; Macchiavelli, A. O. ; Pardo, R. C. ; Richard, A. ; Riley, M. A. ; Savard, G. ; Scheck, M. ; Seweryniak, D. ; Smith, M. 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A.</au><au>Savard, G.</au><au>Scheck, M.</au><au>Seweryniak, D.</au><au>Smith, M. K.</au><au>Vondrasek, R.</au><au>Wiens, A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Direct Evidence of Octupole Deformation in Neutron-Rich Ba 144</atitle><jtitle>Physical review letters</jtitle><date>2016-03-17</date><risdate>2016</risdate><volume>116</volume><issue>11</issue><artnum>112503</artnum><issn>0031-9007</issn><eissn>1079-7114</eissn><abstract>The neutron-rich nucleus Ba-144 (t(1/2) = 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 Ba-144 beam on a 1.0-mg/cm(2) Pb-208 target. The measured value of the matrix element, < 3(1)(-)parallel to M(E3)parallel to 0(1)(+)> = 0.65((+17)(-23)) eb(3/2,) corresponds to a reduced Bd(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.</abstract><pub>American Physical Society</pub><doi>10.1103/PhysRevLett.116.112503</doi><orcidid>https://orcid.org/0000-0002-6468-8292</orcidid><oa>free_for_read</oa></addata></record> |
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| title | Direct Evidence of Octupole Deformation in Neutron-Rich Ba 144 |
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