直接观测到^{11}Be 中的质子发射。

Direct Observation of Proton Emission in ^{11}Be.

机构信息

Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA.

National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.

出版信息

Phys Rev Lett. 2019 Aug 23;123(8):082501. doi: 10.1103/PhysRevLett.123.082501.

DOI:10.1103/PhysRevLett.123.082501

PMID:31491233

Abstract

The elusive β^{-}p^{+} decay was observed in ^{11}Be by directly measuring the emitted protons and their energy distribution for the first time with the prototype Active Target Time Projection Chamber in an experiment performed at ISAC-TRIUMF. The measured β^{-}p^{+} branching ratio is orders of magnitude larger than any previous theoretical model predicted. This can be explained by the presence of a narrow resonance in ^{11}B above the proton separation energy.

摘要

首次利用 ISAC-TRIUMF 上的主动靶时间投影室原型，通过直接测量发射质子及其能量分布，观察到了难以捉摸的β^{-}p^{+}衰变。所测量的β^{-}p^{+}分支比比任何先前的理论模型预测都大几个数量级。这可以通过质子分离能上方^{11}B 中存在窄共振来解释。