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Berlin 2005 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 38: Kernphysik/Spektroskopie

HK 38.1: Group Report

Wednesday, March 9, 2005, 14:00–14:30, TU MA004

Structure studies of the neutron-rich isotopes 17C, 16C and 15C — •H. G. Bohlen1, W. von Oertzen1,2, R. Kalpakchieva3, T. N. Massey4, A. A. Ogloblin5, G. de Angelis6, M. Milin7, Ch. Schulz1, Tz. Kokalova1, and C. Wheldon11Hahn-Meitner-Institut, Berlin — 2Freie Universität, Berlin — 3FLNR, JINR, Dubna — 4Dept. Phys. Astr, Ohio University — 5Kurchatov Institute, Moscow — 6INFN, LNL, Legnaro — 7RBI, Zagreb

Nothing was known about excited states of 17C above the neutron threshold (Sn= 0.729 MeV). We observed thirteen new states up to 16.3 MeV excitation energy with a resolution of 0.25 MeV using the three-neutron transfer reaction 14C(12C,9C)17C at 231 MeV incident energy (the reaction Q-value is Q0= -46.930 MeV). The (12C,9C) reaction has also been used on 12C and 13C targets, and excited states of 15C and 16C have been populated up to 19 MeV and 17.4 MeV, respectively. In the comparison of excitation energies, widths and cross sections of states, a striking correspondence of states in the three isotopes is revealed for ten groups of states, when the spectra of 16C and 15C are shifted in excitation energy by a constant value. This behavior could be understood in the weak-coupling model, assuming an almost complete decoupling between cores and (sd)3 neutron configurations populated in the three-neutron transfer. The structure of 17C states is further investigated in shell-model calculations and by comparison to 19O levels. The neutron decay of the observed resonances in the three carbon isotopes could be understood using the parentage between the structure of mother and daughter states as derived in the weak-coupling model.

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