Positive-Parity Linear-Chain Molecular Band in C16

Shape of C13 studied by the real-time evolution method

“…The structure of the Hoyle state and its analogous states in neighboring nuclei has been one of the major topics in recent decades [2][3][4][5][6][7][8][9][10][11][12][13][14]. In the highly excited region of carbon isotopes, a different type of clustering, the linear chain of α particles, has also been intensively discussed [15][16][17][18][19][20][21][22][23][24][25][26][27][28]. Among the carbon isotopes, 13 C is of particular importance as the system composed of three α particles (bosons) plus a valence nucleon (fermion).…”

Radioactive ion beam physics related to HIAF

“…中国科学院 上海应用物理研究所的研究组 [20] 用多体输运理论 预言了通过偶极矩共振谱识别轻核中α-集团结构的 可能性. 最近, 北京大学的研究组 [21] 在 16 http://engine.scichina.com/doi/10.1360/SSPMA-2020-0282 得RIB束流的能量(动量)分散能够在磁谱仪最后的 聚焦面上基本消除, 而RIB在次级物理靶上破碎后 核芯碎片的物理动量分布却能够在最后的聚焦面 上展宽. 这样消色差匹配的结果, 首次实现了RIB条 件下核芯碎片纵向动量分布的精确测量 [22] .…”

Observation of the near-threshold intruder $0^-$ resonance in $^{12}$Be

“…Although the reordering of some closethreshold orbits can be reproduced phenomenologically by the simple potential model (Woods-Saxon form) [16][17][18], the systematic description and understanding of the open quantum system require explicit treatment of the effective interactions and coupling to the continuum [19]. Over the years, particular attention has been paid to narrow resonances at the vicinity of the particle-separation threshold [14,[20][21][22][23], associated with phenomena such as resonance trapping [13], aligned eigenstates [14] and Efimov states [15].…”

“…The coincidence between the protons with the projectile-like Be ions emitting within 4 • is essential to select the reaction channel and to reduce the background. The protons were identified by their time of flight from the target to the annular silicon detector [22,39]. More details of the experimental setup can be found in [39].…”

“…The differential cross section shown in Fig. 2 was extracted from the corresponding resonant peak at each angular bin [22]. The systematic uncertainty is estimated to be around 10%, contributed mainly from a reasonable variation of the 11 Be cuts (∼ 6%), the influence of the fitting procedure (∼ 5%) and the uncertainty in target thickness (∼ 2%).…”