Speaker
Description
In the past ten years, a series of experiments have been done at the HIRFL-RIBLL1 facility for studying the exotic decays of extremely proton-rich nuclei in sd-shell. Beta-delayed proton and two-proton decays from 20;21Mg, 22;23Al, 22;23;24Si, 26;27P, 27;28;29S have been measured by the continuous implantation-decay method using silicon array combined with gamma-ray detectors [1]. With high detection efficiency, low energy threshold and good statistics, a great number of new decays have been observed and rich information on the -decay spectroscopy (e.g. half-life, decay energy, branching ratio, etc.) has been obtained. Some interesting results related topics will be addressed, including: 1) the beta-delayed two-proton decay of 22Si as well as its mass[2], and large isospin asymmetry in 22Si/22O mirror Gamow-Teller transitions [3]; 2) the branching ratios of proton and gamma decays from the low-lying excited state of 27P and 26Si [4,5], as well as astrophysical reaction rates of 26Si(p,) [6] and 25Al(p, )[5] related to the abundance issue of 26Al in the Milky Way, 3) strongly isospin-mixed doublet in 26Si observed in beta-delayed two-proton decay of 26P [7], and so on. More details will be presented in the conference.
References
[1] L.J. Sun et al., Nucl. Instrum. Methods Phys. Res. A 804, 1-7 (2015).
[2] X.X. Xu et al., Phys. Lett. B 766, 312-316 (2017).
[3] J. Lee et al., Phys. Rev. Lett. 125, 192503 (2020).
[4] L.J. Sun et al., Phys. Rev. C 99, 064312 (2019).
[5] P.F. Liang et al., Phys. Rev. C 101, 024305 (2020).
[6] L.J. Sun et al., Phys. Lett. B 802, 135213 (2020).
[7] J.J. Liu et al., Phys. Rev. Lett. 129, 242502 (2022).
