The conjecture that ultra-high-energy cosmic rays (UHECRS) are actually strangelets is discussed. Besides the reason that strangelets can do as cosmic rays beyond the Greisen-Zatsepin-Kuzmin-cutoff, another argument t...The conjecture that ultra-high-energy cosmic rays (UHECRS) are actually strangelets is discussed. Besides the reason that strangelets can do as cosmic rays beyond the Greisen-Zatsepin-Kuzmin-cutoff, another argument to bombarding bare strange stars. It is proposed that the exotic quark surface of a bare strange star could be an effective astro-laboratory in the investigations of the extra dimensions and of the detection of ultra-high-energy neutrino fluxes. The flux of neutrinos (and other point-like particles) with energy larger than 2.3×10^20 eV could be expected to be smaller than 10^-26 cm^-2 s^-1 if there are two extra spatial dimensions.展开更多
With the construction of the neutron wall for the external target experiment at CSR, it will be possible to detect high energy neutrons. A BUU model (Li Baoan, Phys. Rev. Lett. , 88, 19(2002)192 701.) is applied to si...With the construction of the neutron wall for the external target experiment at CSR, it will be possible to detect high energy neutrons. A BUU model (Li Baoan, Phys. Rev. Lett. , 88, 19(2002)192 701.) is applied to simulate the. neutron flow in both symmetric (Ni+Ni,Pb+Pb) and asymmetric (Pb + Ni) systems.It is shown that, at the energy above iseveral hundreds of,MeV/u, the flow signals are very obvi-展开更多
Some experiments were performed on this accelerator in 2002 year.14 MeV neutrons produced by 600 kV cockroft-walton accelerator are provided for some reactions. The (n, a) and (n, 2p) reactions are very useful for pro...Some experiments were performed on this accelerator in 2002 year.14 MeV neutrons produced by 600 kV cockroft-walton accelerator are provided for some reactions. The (n, a) and (n, 2p) reactions are very useful for producing heavy neutron-rich nuclei in region not accessible from fission. Especially the (n, 2p) icaction, this exotic reaction mechanism, is more important for producing heavy neutron-rich nuclei. This year the experiments 189W was produced by using 192Os(n, a) 189W reaction, 185Hf was produced by using 186W(n, 2p)185Hf reaction. Then the decay of 189W and 185Hf was studied.展开更多
文摘The conjecture that ultra-high-energy cosmic rays (UHECRS) are actually strangelets is discussed. Besides the reason that strangelets can do as cosmic rays beyond the Greisen-Zatsepin-Kuzmin-cutoff, another argument to bombarding bare strange stars. It is proposed that the exotic quark surface of a bare strange star could be an effective astro-laboratory in the investigations of the extra dimensions and of the detection of ultra-high-energy neutrino fluxes. The flux of neutrinos (and other point-like particles) with energy larger than 2.3×10^20 eV could be expected to be smaller than 10^-26 cm^-2 s^-1 if there are two extra spatial dimensions.
文摘With the construction of the neutron wall for the external target experiment at CSR, it will be possible to detect high energy neutrons. A BUU model (Li Baoan, Phys. Rev. Lett. , 88, 19(2002)192 701.) is applied to simulate the. neutron flow in both symmetric (Ni+Ni,Pb+Pb) and asymmetric (Pb + Ni) systems.It is shown that, at the energy above iseveral hundreds of,MeV/u, the flow signals are very obvi-
文摘Some experiments were performed on this accelerator in 2002 year.14 MeV neutrons produced by 600 kV cockroft-walton accelerator are provided for some reactions. The (n, a) and (n, 2p) reactions are very useful for producing heavy neutron-rich nuclei in region not accessible from fission. Especially the (n, 2p) icaction, this exotic reaction mechanism, is more important for producing heavy neutron-rich nuclei. This year the experiments 189W was produced by using 192Os(n, a) 189W reaction, 185Hf was produced by using 186W(n, 2p)185Hf reaction. Then the decay of 189W and 185Hf was studied.
