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Title: 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

Abstract

The β -decay half-lives of 110 neutron-rich isotopes of the elements from Rb 37 to Sn 50 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.

Authors:
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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Research Foundation of Korea (NRF); USDOE Office of Science - Office of Nuclear Physics
OSTI Identifier:
1255557
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 114; Journal Issue: 19; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

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, Zs., Wu, J., Baba, H., Benzoni, G., Chae, K. Y., Crespi, F. C. L., 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, Zs., Sakurai, H., Schaffner, H., Schury, P., Shibagaki, S., Steiger, K., Suzuki, H., Takeda, H., Wendt, A., Yagi, A., and 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. United States: N. p., 2015. Web. doi: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, Zs., Wu, J., Baba, H., Benzoni, G., Chae, K. Y., Crespi, F. C. L., 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, Zs., 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. United States. doi: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, Zs., Wu, J., Baba, H., Benzoni, G., Chae, K. Y., Crespi, F. C. L., 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, Zs., Sakurai, H., Schaffner, H., Schury, P., Shibagaki, S., Steiger, K., Suzuki, H., Takeda, H., Wendt, A., Yagi, A., and Yoshinaga, K. Fri . "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". United States. doi:10.1103/PhysRevLett.114.192501.
@article{osti_1255557,
title = {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},
author = {Lorusso, G. and Nishimura, S. and Xu, Z. Y. and Jungclaus, A. and Shimizu, Y. and Simpson, G. S. and Söderström, P. -A. and Watanabe, H. and Browne, F. and Doornenbal, P. and Gey, G. and Jung, H. S. and Meyer, B. and Sumikama, T. and Taprogge, J. and Vajta, Zs. and Wu, J. and Baba, H. and Benzoni, G. and Chae, K. Y. and Crespi, F. C. L. and Fukuda, N. and Gernhäuser, R. and Inabe, N. and Isobe, T. and Kajino, T. and Kameda, D. and Kim, G. D. and Kim, Y. -K. and Kojouharov, I. and Kondev, F. G. and Kubo, T. and Kurz, N. and Kwon, Y. K. and Lane, G. J. and Li, Z. and Montaner-Pizá, A. and Moschner, K. and Naqvi, F. and Niikura, M. and Nishibata, H. and Odahara, A. and Orlandi, R. and Patel, Z. and Podolyák, Zs. and Sakurai, H. and Schaffner, H. and Schury, P. and Shibagaki, S. and Steiger, K. and Suzuki, H. and Takeda, H. and Wendt, A. and Yagi, A. and Yoshinaga, K.},
abstractNote = {The β -decay half-lives of 110 neutron-rich isotopes of the elements from Rb 37 to Sn 50 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.},
doi = {10.1103/PhysRevLett.114.192501},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 19,
volume = 114,
place = {United States},
year = {2015},
month = {5}
}