对位于质子滴线之外四个中子处的奇特同位素¹³F的观测。
Observation of the Exotic Isotope ^{13}F Located Four Neutrons beyond the Proton Drip Line.
作者信息
Charity R J, Webb T B, Elson J M, Hoff D E M, Pruitt C D, Sobotka L G, Brown K W, Cerizza G, Estee J, Lynch W G, Manfredi J, Morfouace P, Santamaria C, Sweany S, Tsang C Y, Tsang M B, Zhang Y, Zhu K, Kuvin S A, McNeel D, Smith J, Wuosmaa A H, Chajecki Z
机构信息
Departments of Chemistry and Physics, Washington University, St. Louis, Missouri 63130, USA.
National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
出版信息
Phys Rev Lett. 2021 Apr 2;126(13):132501. doi: 10.1103/PhysRevLett.126.132501.
A ^{13}F resonance was observed following a charge-exchange reaction between a fast ^{13}O beam and a ^{9}Be target. The resonance was found in the invariant-mass distribution of 3p+^{10}C events and probably corresponds to a 5/2^{+} excited state. The ground state was also expected to be populated, but was not resolved from the background. The observed level decays via initial proton emissions to both the ground and first 2^{+} state of ^{12}O, which subsequently undergo 2p decay. In addition, there may also be a significant proton decay branch to the second 2^{+} level in ^{12}O. The wave function associated with the observed level may be collectivized due to coupling to the continuum as is it located just above the threshold for proton decay to the 2_{2}^{+} state of ^{12}O.
在快速的(^{13}O)束流与(^{9}Be)靶之间的电荷交换反应之后，观测到了一个(^{13}F)共振。该共振出现在(3p + ^{10}C)事件的不变质量分布中，可能对应于一个(5/2^{+})激发态。预计基态也会产生，但未从背景中分辨出来。观测到的能级通过初始质子发射衰变为(^{12}O)的基态和第一激发(2^{+})态，随后这两个态再经历双质子衰变。此外，可能还存在一个显著的质子衰变分支到(^{12}O)的第二激发(2^{+})能级。由于与连续态耦合，与观测到的能级相关的波函数可能会集体化，因为它刚好位于质子衰变为(^{12}O)的(2_{2}^{+})态的阈值之上。
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