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The unbound isotopes 9,10 He
- Source :
- 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
- Publication Year :
- 2010
-
Abstract
- 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.
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- 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
- Accession number :
- edsair.doi.dedup.....8cd3bdfbd77550079c5ab54660364b7b
- Full Text :
- https://doi.org/10.1016/j.nuclphysa.2010.04.006