期刊
NUCLEAR PHYSICS A
卷 847, 期 1-2, 页码 66-88出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nuclphysa.2010.07.002
关键词
NUCLEAR REACTIONS H-1(Li-11, 2n2p); E=280 MeV/nucleon; H-1(Be-14, 2n2p); E=304 MeV/nucleon; measured fragment spectra; neutron spectra; (fragment)(neutron)-coin; deduced energy and angular three-body correlation coefficients; reaction mechanism features including final state interactions Comparison with three-body; wave function analysis
资金
- Helmholtz Association [HA216/EMMI]
- BMBF [06 DA 115, 06 OF 838, 06 MZ 864]
- GSI via Hochschulzusammenarbeitsvereinbarungen [DA RICK, OF ELZ, MZ KRAK]
- Polish Committee of Scientific Research [KBN/2P03B/144/10]
- CICYT [FPA2009-07387]
- RFBR [08-02-012244]
- E C [ERBCHGE-CT92-0003,, 08-02-00892]
- NSh-7235.2010.2 (NSh)
- Knut and Alice Wallenberg Foundation
- Swedish Research Council
- European Research Council
The very exotic nuclear resonance systems. He-10 and Li-13, are produced in proton-knockout reactions from relativistic beams of Li-11 and Be-14. The experimentally determined energy and angular correlations between their decay products, He-8 + n + n and Li-11 + n + n, are analyzed using an expansion of decay amplitudes in a restricted set of hyperspherical harmonics. By considering only a small number of terms it is possible to extract the expansion coefficients directly from the experimental three-body correlations. This provides a model-independent way of getting information about the decay process. on the structure of the decaying nucleus and on the quantum characteristics of the binary subsystems The results show that the He-8 + n + n relative-energy spectrum can be interpreted as consisting of two resonances, an I-pi = 0(+) ground state and an excited I-pi = 2(+) state. The Li-11 + n + n relative-energy spectrum is interpreted as an I-pi = 3/2(-) ground state overlapping with excited states having a structure similar to the 2(+) state in He-10 but spread over several states due to the coupling to the I-pi = 3/2(-) core The Li-13 data also give evidence for a contribution of a configuration where the two neutrons occupy the d-shell. (C) 2010 Elsevier B.V. All rights reserved.
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