Электронный каталог

Статья

Li, R.
*b-Delayed Spectroscopy of *8*0Ge&sub(48) and Competition Between Gamow-Teller and First-Forbidden Transitions in &sup(80g+m)Ga&sub(49) *b Decay / R.Li, Yu.G.Sobolev, S.Stukalov, [a.o.]. – Text : electronic // Physical Review C. – 2025. – Vol. 112, No. 4. – P. 044306. – URL: https://doi.org/10.1103/xtvt-qy6v.

The 𝛽-delayed spectroscopy of *8*0Ge has been studied using sources of ground and low-lying isomeric states of *8*0Ga . A hybrid 𝛾-ray spectrometer was used, composed of high-purity germanium (HPGe) detectors for low-energy 𝛾-ray detection, phoswich detectors from the PARIS array for high-energy 𝛾 rays and a plastic detector for 𝛽 tagging. The new decay level schemes are presented, with 13 and 14 states 𝛽 populated by &sup(80⁢𝑔)Ga and &sup(80⁢𝑚)Ga , respectively, being reported for the first time. We quantitatively compare summed intensities of first-forbidden and previously reported Gamow-Teller 𝛽 transitions [R. Li et al., Phys. Rev. C 111, 034303 (2025)]. The upper-limit fractions of first-forbidden transitions contributing to the decays of &sup(80⁢𝑔)Ga and &sup(80⁢𝑚)Ga are (48.0±2.7)% and (47.9±3.3)% of the observed total 𝛽 transition intensities of (78.2±2.5)% and (82.2±3.7)%, respectively. Notably, the half-lives decrease in accordance with the upper limits of (48.0±6.0)% [3.67(20) s →1.91⁢(3)⁢s] and (47.9±7.2)% [3.01(19) s →1.57⁢(1)⁢s] for 80⁢𝑔 Ga and 80⁢𝑚 Ga , respectively, when including first-forbidden transitions, in contrast to those by Gamow-Teller transitions only.



ОИЯИ = ОИЯИ (JINR)2025