Spectroscopy of 17C and (sd)3 structures in heavy carbon isotopes

被引:28
作者
Bohlen, H. G.
Kalpakchieva, R.
von Oertzen, W.
Massey, T. N.
Ogloblin, A. A.
de Angelis, G.
Milin, M.
Schulz, Ch.
Kokalova, Tz
Wheldon, C.
机构
[1] Hahn Meitner Inst Berlin GmbH, D-14109 Berlin, Germany
[2] JINR, Flerov Lab Nucl React, RU-141980 Dubna, Russia
[3] BAS, Inst Nucl Res & Nucl Energy, BG-1784 Sofia, Bulgaria
[4] Free Univ Berlin, Fachbereich Phys, D-14195 Berlin, Germany
[5] Ohio Univ, Dept Phys & Astron, Athens, OH 45701 USA
[6] RCC Kurchatov Inst, IGNP, RU-123182 Moscow, Russia
[7] Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy
[8] Rudjer Boskovic Inst, HR-10002 Zagreb, Croatia
关键词
D O I
10.1140/epja/i2006-10275-5
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
The structure of C-17 has been investigated using the three-neutron transfer reaction (C-12, C-9) on a C-14 target at 231 MeV incident energy, the reaction Q-value is Qo = -46.930 MeV. Eleven new states up to 16.3 MeV excitation energy were identified. The same reaction has also been used on a C-12 target (Qo = -38.787 MeV), and excited states in C-15 up to 19 MeV were observed. In C-17 the three transferred neutrons populate (sd)(3) configurations on the C-14 core. The comparison of levels populated by the (C-12, C-9) reaction in C-17, C-16 and C-15 reveals a strong similarity of their properties. This concerns especially nine states in each. of the three carbon isotopes, which show practically the same excitation energies except a constant mean shift of +5.82 MeV for C-16 and +6.65 MeV for C-15 with respect to C-17. The triples of states from the three isotopes, which correspond to each other, have also similar widths and cross-section ratios. It is concluded that the same (sd)(3) structures are populated in the three carbon isotopes. The observed levels of C-17 are also compared to the levels of O-19 with known assignments and to shell model calculations, and their decay properties are discussed.
引用
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页码:279 / 302
页数:24
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