Based on the framework of the Isospin-Dependent Quantum Molecular Dynamics (IQMD) model in which the initial neutron and proton densities are sampled according to the droplet model, the correlation between triton-to-3 He yield ratio (R(t/ 3 He)=Yield(t)/Yield( 3 He)) and neutron skin thickness (δnp) in neutron-rich projectile induced reactions is investigated. By changing the diffuseness parameter of neutron density distribution in the droplet model for the projectile to obtain different δnp, the relationship between δnp and the corresponding R(t/ 3 He) in semi-peripheral collisions is obtained. The calculated results show that R(t/ 3 He) has a strong linear correlation with δnp for neutron-rich 50 Ca and 68 Ni nuclei. It is suggested that R(t/ 3 He) could be regarded as a good experimental observable to extract δnp for neutron-rich nuclei because the yields of charged particles triton and 3 He can be measured quite precisely.
The fragment production in collisions of 48,50 Ca+ 12 C at 50 MeV/nucleon are simulated via the Isospin-Dependent Quantum Molecular Dynamics (IQMD) model followed by the GEMINI code. By changing the diffuseness parameter of neutron density distribution to obtain different neutron skin size, the effects of neutron skin thickness (δnp) on projectile-like fragments (PLF) are investigated. The sensitivity of isoscaling behavior to neutron skin size is studied, from which it is found that the isoscaling parameter α has a linear dependence on δnp. A linear dependence between δnp and the mean N/Z [N(Z) is neutron(proton) number] of PLF is obtained as well. The results show that thicker neutron skin will lead to smaller isoscaling parameter α and N/Z. Therefore, it may be probable to extract information of neutron skin thickness from isoscaling parameter α and N/Z.
The elastic resonance scattering protons decayed from 11B to the ground state of l0Be were measured by using the thick-target technique in inverse kinematics at the Heavy Ion Research Facility in Lanzhou (HIRFL). The obtained excitation functions were well described by a multichannel R-matrix procedure under the kinematics process assumption of resonant elastic scattering. The excitation energy of the resonant states ranges from 13.0 to 17.0 MeV, and their resonant parameters such as the resonant energy £ ,, the spin-parity J n, and the proton-decay partial width I",, were determined from R-matrix fits to the data. Two of these states around E x = 14.55 MeV [7 T = (3/2+ ,5/2+), T,, = 475 ± 80 keV] and Ex = 14.74 MeV [J" = 3 /2 ', Ep = 830 ± 145 keV], and a probably populated state at E, = 16.18 MeV [ V = ( 1 /2 ',3 /2 ') , Vp < 60 keV], are respectively assigned to the well-known states in 11B at 14.34, 15.29, and 16.43 MeV. The isospin of these three states were previously determined to be T = 3/2, but discrepancies exist in widths and energies due to the current counting statistics and energy resolution. We have compared these states with previous measurements, and the observation of the possibly populated resonance is discussed.
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