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  • Y. M. Xing
  • K. A. Li
  • Y. H. Zhang
  • X. H. Zhou
  • M. Wang
  • Yu A. Litvinov
  • K. Blaum
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  • S. Kubono
  • G. Martínez-Pinedo
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  • R. J. Chen
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  • R. S. Mao
  • M. Si
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  • Y. J. Yuan
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  • G. Audi
  • T. Uesaka
  • Y. Yamaguchi
  • T. Yamaguchi
  • A. Ozawa
  • C. Fröhlich
  • F. K. Thielemann
  • B. H. Sun
  • Y. Sun
  • A. C. Dai
  • F. R. Xu
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Original languageEnglish
Number of pages6
Pages (from-to)358-363
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Journal publication date10 Jun 2018
Volume781
Early online date7 Apr 2018
DOIs
Publication statusPublished - 10 Jun 2018

Abstract

Using isochronous mass spectrometry at the experimental storage ring CSRe in Lanzhou, the masses of 82Zr and 84Nb were measured for the first time with an uncertainty of ∼10 keV, and the masses of 79Y, 81Zr, and 83Nb were re-determined with a higher precision. The latter are significantly less bound than their literature values. Our new and accurate masses remove the irregularities of the mass surface in this region of the nuclear chart. Our results do not support the predicted island of pronounced low α separation energies for neutron-deficient Mo and Tc isotopes, making the formation of Zr–Nb cycle in the rp-process unlikely. The new proton separation energy of 83Nb was determined to be 490(400) keV smaller than that in the Atomic Mass Evaluation 2012. This partly removes the overproduction of the p-nucleus 84Sr relative to the neutron-deficient molybdenum isotopes in the previous νp-process simulations.

Notes

© 2018 The Authors. Published by Elsevier B.V. This manuscript is made available under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International licence (CC BY-NC-ND 4.0). For further details please see: https://creativecommons.org/licenses/by-nc-nd/4.0/

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