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In order to study the exotic structures in unstable nuclei at around N = 8, we develop a silicon + CsI(Tl) detection array with large acceptance[1,2], which is suitable for the transfer reactions induced by radioactive beams on the proton and deuteron targets in inverse kinematics. First of all, 57(7)% d-wave and 19(7)% s-wave intruder components in the g.s. of 12Be are deduced from a new 2H(11Be, p) 12Be reaction, which is dramatically different from the g.s. of the one-neutron halo nucleus 11Be with a dominant s-wave intrusion[3,4]. Lately, 12(2)% d- and 5(2)% s-wave intruder strengths in the g.s. of 13B are determined from a new 1H(13B, d)12B reaction. The sudden change of the intruder sd-wave intensity between 13B and 12Be needs further theoretical interpretation[5]. Moreover, a new resonant state at 3.21+ 0.12− 0.04 MeV, located just 40 keV above the one-neutron separation threshold, was observed for the first time in 12Be from the 2H(11Be, p) reaction. This state is assigned a spin-parity of 0− according to the systematics of the level scheme of the N = 8 isotones and decay width analysis[6]. Recently, another new resonant state at Ex = 4.8 ± 0.1 MeV with an intrinsic width of 0.42 ± 0.28 MeV is populated by the 2H(13B, 3He) reaction via a l = 1 proton transfer for the first time.The spin-parity of 2+ is tentatively assigned to this resonance according to the analysis of its angular distributions as well as the theoretical calculations[7].
[1]Li G, Lou J L, Ye Y L, et al. Nucl Inst & Meth A, 2021, 1013, 165637.
[2]Hong‑Yu Zhu, Jian‑Ling Lou, Yan‑Lin Ye et al.,Nucl. Sci& Tech, 2023, 34,159.
[3]Chen J, Lou J L, Ye Y L, et al. Phys Lett B, 2018, 781, 412–416.
[4]Chen J, Lou J L, Ye Y L, et al. Phys Rev C, 2018, 98, 014616.
[5]Liu W, Lou J L, Ye Y L, et al. Phys Rev C, 2021, 104, 064605.
[6]Chen J, Wang S M, Fortune H T, Lou J L et al. Phys Rev C, 2021,103: L031302.
[7]Liu W, Lou J L*, Ye Y L, et al. Phys Rev C, 2022, 105, 034613.
| Section | Experimental and theoretical studies of nuclear reactions |
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