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Lorusso G, Nishimura S, Xu ZY, et al. β-Decay Half-Lives of 110 Neutron-Rich Nuclei across the N=82 Shell Gap: Implications for the Mechanism and Universality of the Astrophysical r Process. Phys Rev Lett. 2015;114(19):192501doi: 10.1103/PhysRevLett.114.192501.
Lorusso, G., Nishimura, S., Xu, Z. Y., Jungclaus, A., Shimizu, Y., Simpson, G. S., Söderström, P. A., Watanabe, H., Browne, F., Doornenbal, P., Gey, G., Jung, H. S., Meyer, B., Sumikama, T., Taprogge, J., Vajta, Z., Wu, J., Baba, H., Benzoni, G., Chae, K. Y., Crespi, F. C., Fukuda, N., Gernhäuser, R., Inabe, N., Isobe, T., Kajino, T., Kameda, D., Kim, G. D., Kim, Y. K., Kojouharov, I., Kondev, F. G., Kubo, T., Kurz, N., Kwon, Y. K., Lane, G. J., Li, Z., Montaner-Pizá, A., Moschner, K., Naqvi, F., Niikura, M., Nishibata, H., Odahara, A., Orlandi, R., Patel, Z., Podolyák, Z., Sakurai, H., Schaffner, H., Schury, P., Shibagaki, S., Steiger, K., Suzuki, H., Takeda, H., Wendt, A., Yagi, A., & Yoshinaga, K. (2015). β-Decay Half-Lives of 110 Neutron-Rich Nuclei across the N=82 Shell Gap: Implications for the Mechanism and Universality of the Astrophysical r Process. Physical review letters, 114(19), 192501. https://doi.org/10.1103/PhysRevLett.114.192501
Lorusso, G, et al. "β-Decay Half-Lives of 110 Neutron-Rich Nuclei across the N=82 Shell Gap: Implications for the Mechanism and Universality of the Astrophysical r Process." Physical review letters vol. 114,19 (2015): 192501. doi: https://doi.org/10.1103/PhysRevLett.114.192501
Lorusso G, Nishimura S, Xu ZY, Jungclaus A, Shimizu Y, Simpson GS, Söderström PA, Watanabe H, Browne F, Doornenbal P, Gey G, Jung HS, Meyer B, Sumikama T, Taprogge J, Vajta Z, Wu J, Baba H, Benzoni G, Chae KY, Crespi FC, Fukuda N, Gernhäuser R, Inabe N, Isobe T, Kajino T, Kameda D, Kim GD, Kim YK, Kojouharov I, Kondev FG, Kubo T, Kurz N, Kwon YK, Lane GJ, Li Z, Montaner-Pizá A, Moschner K, Naqvi F, Niikura M, Nishibata H, Odahara A, Orlandi R, Patel Z, Podolyák Z, Sakurai H, Schaffner H, Schury P, Shibagaki S, Steiger K, Suzuki H, Takeda H, Wendt A, Yagi A, Yoshinaga K. β-Decay Half-Lives of 110 Neutron-Rich Nuclei across the N=82 Shell Gap: Implications for the Mechanism and Universality of the Astrophysical r Process. Phys Rev Lett. 2015 May 15;114(19):192501. doi: 10.1103/PhysRevLett.114.192501. Epub 2015 May 11. PMID: 26024165.
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Phys Rev Lett. 2015 May 15;114(19):192501. doi: 10.1103/PhysRevLett.114.192501. Epub 2015 May 11.

β-Decay Half-Lives of 110 Neutron-Rich Nuclei across the N=82 Shell Gap: Implications for the Mechanism and Universality of the Astrophysical r Process.

Physical review letters

G Lorusso, S Nishimura, Z Y Xu, A Jungclaus, Y Shimizu, G S Simpson, P-A Söderström, H Watanabe, F Browne, P Doornenbal, G Gey, H S Jung, B Meyer, T Sumikama, J Taprogge, Zs Vajta, J Wu, H Baba, G Benzoni, K Y Chae, F C L Crespi, N Fukuda, R Gernhäuser, N Inabe, T Isobe, T Kajino, D Kameda, G D Kim, Y-K Kim, I Kojouharov, F G Kondev, T Kubo, N Kurz, Y K Kwon, G J Lane, Z Li, A Montaner-Pizá, K Moschner, F Naqvi, M Niikura, H Nishibata, A Odahara, R Orlandi, Z Patel, Zs Podolyák, H Sakurai, H Schaffner, P Schury, S Shibagaki, K Steiger, H Suzuki, H Takeda, A Wendt, A Yagi, K Yoshinaga

Affiliations

  1. RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan.
  2. National Physical Laboratory, Teddington, Middlesex TW11 0LW, United Kingdom.
  3. Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom.
  4. Division of Theoretical Astronomy, NAOJ, 181-8588 Mitaka, Japan.
  5. Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
  6. Department of Physics, the University of Hong Kong, Pokfulam Road, Hong Kong.
  7. Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain.
  8. LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France.
  9. IRCNPC, School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China.
  10. School of Computing, Engineering and Mathematics, University of Brighton, Brighton BN2 4JG, United Kingdom.
  11. Department of Physics, Chung-Ang University, Seoul 156-756, Republic of Korea.
  12. Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, USA.
  13. Department of Physics, Tohoku University, Aoba, Sendai, Miyagi 980-8578, Japan.
  14. Departamento de Física Teórica, Universidad Autónoma de Madrid, E-28049 Madrid, Spain.
  15. Institute for Nuclear Research, Hungarian Academy of Sciences, P. O. Box 51, Debrecen H-4001, Hungary.
  16. Department of Physics, Peking University, Beijing 100871, China.
  17. INFN Sezione di Milano, I-20133 Milano, Italy.
  18. Department of Physics, Sungkyunkwan University, Suwon 440-746, Republic of Korea.
  19. Dipartimento di Fisica, Università di Milano, I-20133 Milano, Italy.
  20. Physik Department E12, Technische Universität München, D-85748 Garching, Germany.
  21. Department of Astronomy, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
  22. Institute for Basic Science, Rare Isotope Science Project, Yuseong-daero 1689-gil, Yuseong-gu, 305-811 Daejeon, Republic of Korea.
  23. Department of Nuclear Engineering, Hanyang University, Seoul 133-791, Republic of Korea.
  24. GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany.
  25. Nuclear Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
  26. Department of Nuclear Physics, R.S.P.E., Australian National University, Canberra, Australian Capital Territory 0200, Australia.
  27. Instituto de Física Corpuscular, CSIC-University of Valencia, E-46980 Paterna, Spain.
  28. Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany.
  29. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520-8120, USA.
  30. Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan.
  31. Instituut voor Kern en Stralingsfysica, KU Leuven, University of Leuven, B-3001 Leuven, Belgium.
  32. Department of Physics, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.

PMID: 26024165 DOI: 10.1103/PhysRevLett.114.192501

Abstract

The β-decay half-lives of 110 neutron-rich isotopes of the elements from _{37}Rb to _{50}Sn were measured at the Radioactive Isotope Beam Factory. The 40 new half-lives follow robust systematics and highlight the persistence of shell effects. The new data have direct implications for r-process calculations and reinforce the notion that the second (A≈130) and the rare-earth-element (A≈160) abundance peaks may result from the freeze-out of an (n,γ)⇄(γ,n) equilibrium. In such an equilibrium, the new half-lives are important factors determining the abundance of rare-earth elements, and allow for a more reliable discussion of the r process universality. It is anticipated that universality may not extend to the elements Sn, Sb, I, and Cs, making the detection of these elements in metal-poor stars of the utmost importance to determine the exact conditions of individual r-process events.

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