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

Xing, Y. M.; Li, K. A.; Zhang, Y. H.; Zhou, X. H.; Wang, M.; Litvinov, Yu. A.; Blaum, K.; Wanajo, S.; Kubono, S.; Martínez-Pinedo, G.; Sieverding, A.; Chen, R. J.; Shuai, P.; Fu, C. Y.; Yan, X. L.; Huang, W. J.; Xu, X.; Tang, X. D.; Xu, H. S.; Bao, T.; Chen, X. C.; Gao, B. S.; He, J. J.; Lam, Y. H.; Li, H. F.; Liu, J. H.; Ma, X. W.; Mao, R. S.; Si, M.; Sun, M. Z.; Tu, X. L.; Wang, Q.; Yang, J. C.; Yuan, Y. J.; Zeng, Q.; Zhang, P.; Zhou, X.; Zhan, W. L.; Litvinov, S.; Audi, G.; Uesaka, T.; Yamaguchi, Y.; Yamaguchi, T.; Ozawa, A.; Fröhlich, C.; Rauscher, T.; Thielemann, F. -K.; Sun, B. H.; Sun, Y.; Dai, A. C.; Xu, F. R.

doi:10.1016/j.physletb.2018.04.009

Title: Mass measurements of neutron-deficient Y, Zr, and Nb isotopes and their impact on rp and νp nucleosynthesis processes

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.

Authors:

Xing, Y. M.; Li, K. A.; Zhang, Y. H.; Zhou, X. H.; Wang, M.;

; Blaum, K.; Wanajo, S.; Kubono, S.; Martínez-Pinedo, G.; Sieverding, A.; Chen, R. J.;

; Fu, C. Y.; Yan, X. L.; Huang, W. J.; Xu, X.; Tang, X. D.; Xu, H. S.; Bao, T. more »

Publication Date:: Fri Jun 01 00:00:00 EDT 2018

Research Org.:: North Carolina State University, Raleigh, NC (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1437859

Alternate Identifier(s):: OSTI ID: 1499316

Grant/Contract Number:: SC0010263

Resource Type:: Published Article

Journal Name:: Physics Letters B

Additional Journal Information:: Journal Name: Physics Letters B Journal Volume: 781 Journal Issue: C; Journal ID: ISSN 0370-2693

Publisher:: Elsevier

Country of Publication:: Netherlands

Language:: English

Subject:: 36 MATERIALS SCIENCE; 07 ISOTOPE AND RADIATION SOURCES

Citation Formats


                    Xing, Y. M., Li, K. A., Zhang, Y. H., Zhou, X. H., Wang, M., Litvinov, Yu. A., Blaum, K., Wanajo, S., Kubono, S., Martínez-Pinedo, G., Sieverding, A., Chen, R. J., Shuai, P., Fu, C. Y., Yan, X. L., Huang, W. J., Xu, X., Tang, X. D., Xu, H. S., Bao, T., Chen, X. C., Gao, B. S., He, J. J., Lam, Y. H., Li, H. F., Liu, J. H., Ma, X. W., Mao, R. S., Si, M., Sun, M. Z., Tu, X. L., Wang, Q., Yang, J. C., Yuan, Y. J., Zeng, Q., Zhang, P., Zhou, X., Zhan, W. L., Litvinov, S., Audi, G., Uesaka, T., Yamaguchi, Y., Yamaguchi, T., Ozawa, A., Fröhlich, C., Rauscher, T., Thielemann, F. -K., Sun, B. H., Sun, Y., Dai, A. C., and Xu, F. R. Mass measurements of neutron-deficient Y, Zr, and Nb isotopes and their impact on rp and νp nucleosynthesis processes.  Netherlands: N. p., 2018. 
Web.  doi:10.1016/j.physletb.2018.04.009.

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                    Xing, Y. M., Li, K. A., Zhang, Y. H., Zhou, X. H., Wang, M., Litvinov, Yu. A., Blaum, K., Wanajo, S., Kubono, S., Martínez-Pinedo, G., Sieverding, A., Chen, R. J., Shuai, P., Fu, C. Y., Yan, X. L., Huang, W. J., Xu, X., Tang, X. D., Xu, H. S., Bao, T., Chen, X. C., Gao, B. S., He, J. J., Lam, Y. H., Li, H. F., Liu, J. H., Ma, X. W., Mao, R. S., Si, M., Sun, M. Z., Tu, X. L., Wang, Q., Yang, J. C., Yuan, Y. J., Zeng, Q., Zhang, P., Zhou, X., Zhan, W. L., Litvinov, S., Audi, G., Uesaka, T., Yamaguchi, Y., Yamaguchi, T., Ozawa, A., Fröhlich, C., Rauscher, T., Thielemann, F. -K., Sun, B. H., Sun, Y., Dai, A. C., & Xu, F. R. Mass measurements of neutron-deficient Y, Zr, and Nb isotopes and their impact on rp and νp nucleosynthesis processes.  Netherlands.  https://doi.org/10.1016/j.physletb.2018.04.009

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                    Xing, Y. M., Li, K. A., Zhang, Y. H., Zhou, X. H., Wang, M., Litvinov, Yu. A., Blaum, K., Wanajo, S., Kubono, S., Martínez-Pinedo, G., Sieverding, A., Chen, R. J., Shuai, P., Fu, C. Y., Yan, X. L., Huang, W. J., Xu, X., Tang, X. D., Xu, H. S., Bao, T., Chen, X. C., Gao, B. S., He, J. J., Lam, Y. H., Li, H. F., Liu, J. H., Ma, X. W., Mao, R. S., Si, M., Sun, M. Z., Tu, X. L., Wang, Q., Yang, J. C., Yuan, Y. J., Zeng, Q., Zhang, P., Zhou, X., Zhan, W. L., Litvinov, S., Audi, G., Uesaka, T., Yamaguchi, Y., Yamaguchi, T., Ozawa, A., Fröhlich, C., Rauscher, T., Thielemann, F. -K., Sun, B. H., Sun, Y., Dai, A. C., and Xu, F. R. Fri .  
"Mass measurements of neutron-deficient Y, Zr, and Nb isotopes and their impact on rp and νp nucleosynthesis processes".  Netherlands.  https://doi.org/10.1016/j.physletb.2018.04.009.

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@article{osti_1437859,

  title        = {Mass measurements of neutron-deficient Y, Zr, and Nb isotopes and their impact on rp and νp nucleosynthesis processes},

  author       = {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 Martínez-Pinedo, G. and Sieverding, A. and Chen, R. J. and Shuai, P. 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 Fröhlich, C. and Rauscher, T. and Thielemann, F. -K. and Sun, B. H. and Sun, Y. and Dai, A. C. and Xu, F. R.},

  abstractNote = {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.},

  doi          = {10.1016/j.physletb.2018.04.009},

  journal      = {Physics Letters B},

  number       = C,

  volume       = 781,

  place        = {Netherlands},

  year         = {Fri Jun 01 00:00:00 EDT 2018},

  month        = {Fri Jun 01 00:00:00 EDT 2018}

}

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Fig. 1. : (a) Part of the revolution time spectrum. The nuclides of interest are indicated with red letters; the peaks with possible isomer mixture not resolved in this work are shown with blue letters. Bottom: Differences between the re-determined mass excess values from this work (M E _{E Xmore » P} ) and those from AME′12 [41]. Note that each of the M E_{E X P} values in Fig. 1(b) is re-determined by using the other 27 references, while the M E _{E X P} values in Fig. 1(c) are determined by using all 28 nuclides for mass calibration (see text for details). The gray shadows represent the 1σ errors from AME′12. (For interpretation of the colors in the figure(s), the reader is referred to the web version of this article.)

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