The unbound isotopes 9,10 He
| Autor: | Herbert A. Simon, Helmut Weick, Mikhail V. Zhukov, Håkan T Johansson, Achim Richter, K. Sümmerer, G. Münzenberg, U. Datta Pramanik, Thomas Nilsson, Gunnar Nyman, Mattias Lantz, R. Kulessa, G. Ickert, C. Langer, W. Prokopowicz, H. Emling, Björn Jonson, M. J. G. Borge, H. O. U. Fynbo, A. Chatillon, Mikael Meister, L. V. Chulkov, Olof Tengblad, G. Schrieder, D. Cortina-Gil, K. Boretzky, K. Mahata, Rene Reifarth, T. LeBleis, R. Palit, Yu. Aksyutina, Christian Forssén, K. Riisager, Thomas Aumann, Stefanos Paschalis, Hans Geissel |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Johansson, H T, Aksyutina, Y, Aumann, T, Boretzky, K, Borge, M J G, Chatillon, A, Chulkov, L V, Cortina-Gil, D, Datta Pramanik, U, Emling, H, Forssén, C, Fynbo, H O U, Geissel, H, Ickert, G, Jonson, B, Kulessa, R, Langer, C, Lantz, M, LeBleis, T, Mahata, K, Meister, M, Münzenberg, G, Nillson, T, Nyman, G, Palit, R, Paschalis, S, Prokopowicz, W, Reifarth, R, Richter, A, Riisager, K, Schrieder, G, Simon, H, Sümmerer, K, Tengblad, O, Weick, H & Zhukov, M V 2010, ' The unbound isotopes 9,10 He ', Nuclear Physics A: Nuclear and Hadronic Physics, vol. 842, no. 1-4, pp. 15-32 . https://doi.org/10.1016/j.nuclphysa.2010.04.006 |
| DOI: | 10.1016/j.nuclphysa.2010.04.006 |
| Popis: | The unbound nuclei He-9 and He-10 have been produced in proton-knockout reactions from a 280 MeV/u Li-11 beam impinging on a liquid hydrogen target at the ALADIN-LAND setup at GSI. Information on their nuclear structure has been obtained from the relative-energy spectra, He-8 + n and He-8 + 2n, employing reaction models incorporating the structure of Li-11. The (8H)e + n relative-energy spectrum is dominated by a strong peak-like structure at low energy, which may be interpreted within the effective-range approximation as the result of an s-wave interaction with a neutron scattering length of -3.17(66) fm. This spectrum also shows evidence for resonance states at 1.33(8) MeV and at 2.4 MeV above the He-8 + n threshold. It is argued that the s-state might not be the He-9 ground state. For He-8 + n + n, the analysis of the relative-energy spectrum gives two alternative possibilities for an interpretation: either a narrow resonance at 1.42(10) MeV (Gamma = 1.11(76) MeV) superimposed on a correlated background, or two overlapping resonances, a ground state at 1.54(11) MeV (Gamma = 1.91(41) MeV) together with an excited state at 3.99(26) MeV (Gamma = 1.64(89) MeV). The two possible interpretations are discussed. (C) 2010 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|