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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:
 [1];  [2];  [3];  [2];  [2]; ORCiD logo [1];  [4];  [5];  [6];  [7];  [8];  [1]; ORCiD logo [2];  [2];  [2];  [9];  [2];  [2];  [2];  [2] more »;  [2];  [2];  [10];  [2];  [11];  [11];  [2];  [2];  [11];  [11];  [2];  [11];  [2];  [2];  [12];  [11];  [13];  [2];  [14];  [9];  [15];  [15];  [16];  [17];  [18];  [19];  [20];  [21];  [22];  [23];  [23] « less
  1. Chinese Academy of Sciences (CAS), Lanzhou (China). CAS Key Lab. of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science, Inst. of Modern Physics; GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  2. Chinese Academy of Sciences (CAS), Lanzhou (China). CAS Key Lab. of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science, Inst. of Modern Physics
  3. Chinese Academy of Sciences (CAS), Lanzhou (China). CAS Key Lab. of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science, Inst. of Modern Physics; GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany). ExtreMe Matter Inst. EMMI
  4. Max-Planck-Inst. für Kernphysik, Heidelberg (Germany)
  5. Sophia Univ., Chiyoda-ku, Tokyo (Japan). Dept. of Engineering and Applied Sciences; Inst. of Physical and Chemical Research (RIKEN), Wako (Japan). iTHES Research Group
  6. Chinese Academy of Sciences (CAS), Lanzhou (China). CAS Key Lab. of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science, Inst. of Modern Physics; Univ. of Tokyo (Japan). Center for Nuclear Study
  7. GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Technische Univ. Darmstadt (Germany). Inst. fur Kernphysik
  8. Technische Univ. Darmstadt (Germany). Inst. fur Kernphysik; GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  9. Univ. Paris-Sud, Orsay (France). Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM); Univ. Paris-Saclay, Gif-sur-Yvette (France)
  10. Chinese Academy of Sciences (CAS), Lanzhou (China). CAS Key Lab. of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science, Inst. of Modern Physics, and Key Lab. of Optical Astronomy, National Astronomical Observatories
  11. Chinese Academy of Sciences (CAS), Lanzhou (China). CAS Key Lab. of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science, Inst. of Modern Physics; Univ. of Chinese Academy of Sciences, Beijing (China)
  12. Chinese Academy of Sciences (CAS), Lanzhou (China). CAS Key Lab. of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science, Inst. of Modern Physics; Univ. of Science and Technology of China, Hefei (China). Research Center for Hadron Physics, National Lab. of Heavy Ion Accelerator Facility in Lanzhou
  13. Chinese Academy of Sciences (CAS), Lanzhou (China). CAS Key Lab. of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science, Inst. of Modern Physics; Univ. of Chinese Academy of Sciences, Beijing (China)
  14. GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  15. RIKEN, Saitama (Japan). Nishina Center
  16. Saitama Univ. Saitama (Japan). Dept. of Physics
  17. Univ. of Tsukuba, Ibaraki (Japan). Inst. of Physics
  18. North Carolina State Univ., Raleigh, NC (United States)
  19. Univ. of Hertfordshire, Hatfield (United Kingdom). Centre for Astrophysical Research
  20. Univ. of Basel (Switzerland). Dept. of Physics
  21. Beihang Univ., Beijing (China). School of Physics and Nuclear Energy Engineering
  22. Shanghai Jiao Tong Univ. (China). Dept. of Physics and Astronomy
  23. Peking Univ., Beijing (China). School of Physics, State Key Lab. of Nuclear Physics and Technology
Publication Date:
Research Org.:
North Carolina State Univ., Raleigh, NC (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1437859
Alternate Identifier(s):
OSTI ID: 1499316
Grant/Contract Number:  
SC0010263
Resource Type:
Journal Article: Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 781; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
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. United States: N. p., 2018. Web. doi:10.1016/j.physletb.2018.04.009.
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. United States. doi:10.1016/j.physletb.2018.04.009.
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. Sat . "Mass measurements of neutron-deficient Y, Zr, and Nb isotopes and their impact on rp and νp nucleosynthesis processes". United States. doi:10.1016/j.physletb.2018.04.009.
@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. Section B},
issn = {0370-2693},
number = C,
volume = 781,
place = {United States},
year = {2018},
month = {4}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.physletb.2018.04.009

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