Structure of neutron-rich oxygen isotopes

Autor: Mikael Meister, K. Riisager, Andreas Stolz, B. Sitar, Karin Markenroth, U. Datta Pramanik, S.K. Mandal, Haik Simon, Yolanda Prezado, Thomas Baumann, J. Fernández-Vázquez, M. Mocko, G. Muenzenberg, A. Ozawa, Heiko Scheit, Thomas Aumann, D. Cortina-Gil, P. Strmen, G. Schrieder, Takashi Ohtsubo, I. Szarka, R. Janik, Björn Jonson, H. Weick, J. Benlliure, L. M. Fraile, L. V. Chulkov, Hans Geissel, J. Gerl, K. Suemmerer, Christian Forssén, K. Itahashi, R. Schneider, F. Hammache, María José García Borge
Rok vydání: 2005
Předmět:
Zdroj: Digital.CSIC. Repositorio Institucional del CSIC
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Cortina-Gil, D, Fernandez-Vazquez, J, Aumann, T, Baumann, T, Benlliure, J, Borge, M J G, Chulkov, L V, Datta Pramanik, U, Forssén, C, Fraile, L M, Geissel, H, Gerl, J, Hammache, F, Itahashi, K, Janik, R, Jonson, B, Mandal, S, Markenroth, K, Meister, M, Mocko, M, Muenzenberg, G, Ohtsubo, T, Ozawa, A, Prezado, Y, Riisager, K V, Scheit, H, Schneider, R, Schrieder, G, Simon, H, Sitar, B, Stolz, A, Strmen, P, Suemmerer, K, Szarka, I & Weick, H 2005, ' Structure of neutron-rich oxygen isotopes ', J. Phys. G., vol. 31, pp. S1629-1632 .
Popis: 4 pages, 1 table, 2 figures.
One-nucleon removal reactions at relativistic energies have been used as a spectroscopic tool for obtaining information about the ground state of neutron-rich oxygen isotopes. Using the FRS at GSI, the longitudinal momentum distributions of the emerging fragments after breakup were measured along with the one-nucleon removal cross-sections. The relative contributions of the remaining fragments in their ground and excited states have been determined for a few cases from measurements of gamma rays in coincidence with the longitudinal momentum distribution.. The controversial case of O-23 has been directly addressed. Comparison of our exclusive momentum distributions for the one-neutron removal channel to theoretical momentum distributions calculated with an Eikonal model for the knockout process rendered a spin and parity of I-pi = 1/2(+) for the O-23 ground state. This result resolves the existent experimental discrepancy and supports sub-shell closure at N = 14 with a fairly pure 2s(1/2) neutron in O-23.
Databáze: OpenAIRE
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