Precision Mass Measurements on Neutron-Rich Rare-Earth Isotopes at JYFLTRAP : Reduced Neutron Pairing and Implications for r-Process Calculations

Vilén, Markus; Kelly, J. M.; Kankainen, Anu; Brodeur, M.; Aprahamian, A.; Canete, Laetitia; Eronen, Tommi; Jokinen, Ari; Kuta, T.; Moore, Iain; Mumpower, M. R.; Nesterenko, Dmitrii; Penttilä, Heikki; Pohjalainen, Ilkka; Porter, W. S.; Rinta-Antila, Sami; Surman, R.; Voss, Annika; Äystö, Juha

doi:10.1103/physrevlett.120.262701

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Vilén, M., Kelly, J. M., Kankainen, A., Brodeur, M., Aprahamian, A., Canete, L., Eronen, T., Jokinen, A., Kuta, T., Moore, I., Mumpower, M. R., Nesterenko, D., Penttilä, H., Pohjalainen, I., Porter, W. S., Rinta-Antila, S., Surman, R., Voss, A., & Äystö, J. (2018). Precision Mass Measurements on Neutron-Rich Rare-Earth Isotopes at JYFLTRAP : Reduced Neutron Pairing and Implications for r-Process Calculations. Physical Review Letters, 120(26), Article 262701. https://doi.org/10.1103/physrevlett.120.262701

Julkaistu sarjassa

Physical Review Letters

Tekijät

Vilén, Markus |

Kelly, J. M. |

Kankainen, Anu |

Brodeur, M. |

Aprahamian, A. |

Canete, Laetitia |

Eronen, Tommi |

Jokinen, Ari |

Kuta, T. |

Moore, Iain |

Mumpower, M. R. |

Nesterenko, Dmitrii |

Penttilä, Heikki |

Pohjalainen, Ilkka |

Porter, W. S. |

Rinta-Antila, Sami |

Surman, R. |

Voss, Annika |

Äystö, Juha

Päivämäärä

2018

Oppiaine

Kiihdytinlaboratorio Accelerator Laboratory

Tekijänoikeudet

The rare-earth peak in the r-process abundance pattern depends sensitively on both the astrophysical conditions and subtle changes in nuclear structure in the region. This work takes an important step towards elucidating the nuclear structure and reducing the uncertainties in r-process calculations via precise atomic mass measurements at the JYFLTRAP double Penning trap. Nd158, Pm160, Sm162, and Gd164-166 have been measured for the first time, and the precisions for Nd156, Pm158, Eu162,163, Gd163, and Tb164 have been improved considerably. Nuclear structure has been probed via two-neutron separation energies S2n and neutron pairing energy metrics Dn. The data do not support the existence of a subshell closure at N=100. Neutron pairing has been found to be weaker than predicted by theoretical mass models. The impact on the calculated r-process abundances has been studied. Substantial changes resulting in a smoother abundance distribution and a better agreement with the solar r-process ... showmore

Julkaisija

American Physical Society

ISSN Hae Julkaisufoorumista

0031-9007

Rahoittaja(t)

Suomen Akatemia

Rahoitusohjelmat(t)

Akatemiatutkija, SA; Akatemiatutkijan tutkimuskulut, SA

Lisätietoja rahoituksesta

This work has been supported by the Academy of Finland under the Finnish Centre of Excellence Program (Nuclear and Accelerator Based Physics Research at JYFL) and by the National Science Foundation (NSF) Grants No. PHY-1419765 and No. PHY-1713857. A. K., D. A. N., and L. C. acknowledge the support from the Academy of Finland under Projects No. 275389, No. 284516, and No. 312544, and T. E. under P ... showmore

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