利用^(15)N(d,p)^(16)N反应研究^(16)F低能级质子宽度

Proton Width of^(16)F Low-lying State from^(15)N(d,p)^(16)N

^(16)F是质子滴线附近的奇特原子核,它的所有态均不稳定,会发生质子衰变。目前^(16)F前4个态的自旋宇称及激发能已通过实验精确测定,但能级宽度仍存在较大分歧。本工作通过^(15)N(d,p)^(16)N反应角分布的高精度测量,确定了^(16)N基态和前3个激发态的谱因子;进而根据镜像核的电荷对称性,用^(16)N的中子谱因子导出了^(16)F基态和前3个激发态的质子宽度分别为(29.9±4.1)keV、(108±13)keV、(5.04±0.48)keV和(14.5±1.4)keV。本工作通过一个独立的实验方法为^(16)F的质子宽度提供了一个重要的交叉检验。

^(16)F is an exotic nucleus near the proton drip line.All states of^(16)F are unstable and can decay by proton emission.Up to now,the spin-parity values and excitation energy of the four low-lying states in^(16)F have been determined by experiment.However,discrepancies still exist among proton widths.The^(15)N(d,p)^(16)N angular distributions were measured precisely.The neutron spectroscopic factors of^(16)N ground state and first three excited states were determined.The proton widths of the four low-lying states of^(16)F were deduced to be(29.9±4.1)keV,(108±13)keV,(5.04±0.48)keV and(14.5±1.4)keV,respectively,according to the charge symmetry of mirror nuclei.The present results provide important crosscheck for the proton widths of^(16)F experimentally.