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
- 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, Zhenyu
- 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.
DOIAbstract
International audienceThe β-decay half-lives of 110 neutron-rich isotopes of the elements from Rb37 to Sn50 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,...
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