Mass measurements of neutron-deficient Y, Zr, and Nb isotopes and their impact on rp and nu p nucleosynthesis processes

Xing, Y. M. and Li, K. A. and Zhang, Y. H. and Zhou, X. H. and Wang, M. and Litvinov, Yu. A. and Blaum, K. and Wanajo, S. and Kubono, S. and Martinez-Pinedo, G. and Sieverding, A. and Chen, R. J. and Shuai, R. and Fu, C. Y. and Yan, X. L. and Huang, W. J. and Xu, X. and Tang, X. D. and Xu, H. S. and Bao, T. and Chen, X. C. and Gao, B. S. and He, J. J. and Lam, Y. H. and Li, H. F. and Liu, J. H. and Ma, X. W. and Mao, R. S. and Si, M. and Sun, M. Z. and Tu, X. L. and Wang, Q. and Yang, J. C. and Yuan, Y. J. and Zeng, Q. and Zhang, P. and Zhou, X. and Zhan, W. L. and Litvinov, S. and Audi, G. and Uesaka, T. and Yamaguchi, Y. and Yamaguchi, T. and Ozawa, A. and Frohlich, C. and Rauscher, T. and Thielemann, F. -K. and Sun, B. H. and Sun, Y. and Dai, A. C. and Xu, F. R.. (2018) Mass measurements of neutron-deficient Y, Zr, and Nb isotopes and their impact on rp and nu p nucleosynthesis processes. Physics Letters B, 781. pp. 358-363.

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Using isochronous mass spectrometry at the experimental storage ring CSRe in Lanzhou, the masses of Zr-82 and Nb-84 were measured for the first time with an uncertainty of similar to 10 keV, and the masses of (79)y, Zr-81, and Nb-83 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 alpha 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 Nb-83 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 Sr-84 relative to the neutron-deficient molybdenum isotopes in the previous vp-process simulations. (C) 2018 The Authors. Published by Elsevier B.V.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Rauscher, Thomas and Thielemann, Friedrich-Karl
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:13 Aug 2018 11:07
Deposited On:13 Aug 2018 11:07

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