New insight into the low-energy $^{9}$He spectrum
| Autor: | Golovkov, M. S., Grigorenko, L. V., Fomichev, A. S., Gorshkov, A. V., Gorshkov, V. A., Krupko, S. A., Oganessian, Yu. Ts., Rodin, A. M., Sidorchuk, S. I., Slepnev, R. S., Stepantsov, S. V., Ter-Akopian, G. M., Wolski, R., Korsheninnikov, A. A., Nikolskii, E. Yu., Kuzmin, V. A., Novatskii, B. G., Stepanov, D. N., Fortier, S., Roussel-Chomaz, P., Mittig, W. |
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| Přispěvatelé: | Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Physical Review C Physical Review C, American Physical Society, 2007, 76, pp.021605. ⟨10.1103/PhysRevC.76.021605⟩ Physical Review C, 2007, 76, pp.021605. ⟨10.1103/PhysRevC.76.021605⟩ |
| ISSN: | 2469-9985 2469-9993 |
| DOI: | 10.1103/PhysRevC.76.021605⟩ |
| Popis: | The spectrum of $^9$He was studied by means of the $^8$He($d$,$p$)$^9$He reaction at a lab energy of 25 MeV/n and small center of mass (c.m.) angles. Energy and angular correlations were obtained for the $^9$He decay products by complete kinematical reconstruction. The data do not show narrow states at $\sim $1.3 and $\sim $2.4 MeV reported before for $^9$He. The lowest resonant state of $^9$He is found at about 2 MeV with a width of $\sim $2 MeV and is identified as $1/2^-$. The observed angular correlation pattern is uniquely explained by the interference of the $1/2^-$ resonance with a virtual state $1/2^+$ (limit on the scattering length is obtained as $a > -20$ fm), and with the $5/2^+$ resonance at energy $\geq 4.2$ MeV. 5 pages, 4 figures, 2 tables |
| Databáze: | OpenAIRE |
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