Isospin symmetry in B(E2) values : Coulomb excitation study of 21Mg

Ruotsalainen, P.; Henderson, J.; Hackman, G.; Sargsyan, G. H.; Launey, K. D.; Saxena, A.; Srivastava, P. C.; Stroberg, S. R.; Grahn, Tuomas; Pakarinen, Janne; Ball, G. C.; Julin, Rauno; Greenlees, Paul; Smallcombe, J.; Andreoiu, C.; Bernier, N.; Bowry, M.; Buckner, M.; Caballero-Folch, R.; Chester, A.; Cruz, S.; Evitts, L. J.; Frederick, R.; Garnsworthy, A. B.; Holl, M.; Kurkjian, A.; Kisliuk, D.; Leach, K. G.; McGee, E.; Measures, J.; Mücher, D.; Park, J.; Sarazin, F.; Smith, J. K.; Southall, D.; Starosta, K.; Svensson, C. E.; Whitmore, K.; Williams, M.; Wu, C. Y.

doi:10.1103/physrevc.99.051301

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Ruotsalainen, P., Henderson, J., Hackman, G., Sargsyan, G. H., Launey, K. D., Saxena, A., Srivastava, P. C., Stroberg, S. R., Grahn, T., Pakarinen, J., Ball, G. C., Julin, R., Greenlees, P., Smallcombe, J., Andreoiu, C., Bernier, N., Bowry, M., Buckner, M., Caballero-Folch, R., . . . Wu, C. Y. (2019). Isospin symmetry in B(E2) values : Coulomb excitation study of 21Mg. Physical Review C, 99(5), Article 051301(R). https://doi.org/10.1103/physrevc.99.051301

Julkaistu sarjassa

Physical Review C

Tekijät

Ruotsalainen, P. |

Henderson, J. |

Hackman, G. |

Sargsyan, G. H. |

Launey, K. D. |

Saxena, A. |

Srivastava, P. C. |

Stroberg, S. R. |

Grahn, Tuomas |

Pakarinen, Janne |

Ball, G. C. |

Julin, Rauno |

Greenlees, Paul |

Smallcombe, J. |

Andreoiu, C. |

Bernier, N. |

Bowry, M. |

Buckner, M. |

Caballero-Folch, R. |

Chester, A. |

Cruz, S. |

Evitts, L. J. |

Frederick, R. |

Garnsworthy, A. B. |

Holl, M. |

Kurkjian, A. |

Kisliuk, D. |

Leach, K. G. |

McGee, E. |

Measures, J. |

Mücher, D. |

Park, J. |

Sarazin, F. |

Smith, J. K. |

Southall, D. |

Starosta, K. |

Svensson, C. E. |

Whitmore, K. |

Williams, M. |

Wu, C. Y.

Päivämäärä

2019

Oppiaine

Kiihdytinlaboratorio Accelerator Laboratory

Tekijänoikeudet

The Tz=−32 nucleus 21Mg has been studied by Coulomb excitation on 196Pt and 110Pd targets. A 205.6(1)-keV γ-ray transition resulting from the Coulomb excitation of the 52+ ground state to the first excited 12+ state in 21Mg was observed for the first time. Coulomb excitation cross-section measurements with both targets and a measurement of the half-life of the 12+ state yield an adopted value of B(E2;52+→12+)=13.3(4) W.u. A new excited state at 1672(1) keV with tentative 92+assignment was also identified in 21Mg. This work demonstrates a large difference in the B(E2;52+→12+) value between T=32, A=21 mirror nuclei. The difference is investigated in the shell-model framework employing both isospin conserving and breaking USD interactions and using modern ab initio nuclear structure calculations, which have recently become applicable in the sd shell.

Julkaisija

American Physical Society

ISSN Hae Julkaisufoorumista

2469-9985

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