Электронный каталог

Статья

Xu, X.-D.
Isospin Symmetry Breaking Disclosed in the Decay of Three-Proton Emitter *2*0Al / X.-D.Xu, A.Fomichev, L.V.Grigorenko, [a.o.]. – Text : electronic // Physical Review Letters. – 2025. – Vol. 135, No. 2. – P. 022502. – URL: https://doi.org/10.1103/hkmy-yfdk. – Bibliogr.: 51.

The previously unknown nucleus *2*0Al has been observed for the first time by detecting its in-flight decays. Tracking trajectories of all decay products with silicon microstrip detectors allowed for a conclusion that *2*0Al is unbound with respect to three-proton (3⁢𝑝) emission. The 3⁢𝑝-decay energy of the *2*0Al ground state has been determined to be 1.93(&sup(+0.12 )&sub(−0.10))  MeV through a detailed study of angular correlations of its decay products, *1*7Ne +𝑝+𝑝+𝑝. This value is significantly smaller than the predictions inferred from the isospin symmetry by using the known neutron separation energy of its mirror nucleus *2*0N , which indicates a possible isospin symmetry breaking in the mirror nuclei *2*0Al and *2*0N . This observed isospin symmetry breaking is supported by the calculations of the continuum embedded theoretical frameworks, describing the observed *2*0Al ground state as a 1⁢𝑝 𝑠-wave state with a spin-parity of 1*−, which differs from the spin-parity (2−) of the *2*0N ground state. The *2*0Al ground state decays by sequential 1⁢𝑝−2⁢𝑝 emission via the intermediate ground state of *1*9Mg , which is the first observed case of “daughter” 2⁢𝑝 radioactivity following 1⁢𝑝 decay of the parent state.



ОИЯИ = ОИЯИ (JINR)2025