New &beta;-delayed proton decays in the rare-earth region near the proton drip line

	New β-delayed proton decays in the rare-earth region near the proton drip line
	Xu, Shuwei; Li, Zhankui; Xie, Yuanxiang; Yu, Yong; Pan, Qiangyan; Wang, Chunfang; Xing, Jianping; Ma, Ruichang; Ge, Yuanxiu; Zhang, Tianmei
刊名	Science in China, Series A: Mathematics, Physics, Astronomy
	2000
卷号	43 页码:885-891
ISSN号	1006-9283
英文摘要	The β-delayed proton precursors ¹²⁵Nd, ¹²⁸Pm, ¹²⁹Sm, ¹³⁷Gd and ¹³⁹Dy near the proton drip line were produced by the irradiation of ⁹²Mo, ⁹⁶Ru and ¹⁰⁶Cd with an ³⁶Ar beam, and conclusively identified for the first time by using proton-gamma coincidence in combination with a He-jet tape transport system. Their half-lives were determined to be 0.60(15)s, 1.0(3)s, 0.55(10)s, 2.2(2)s and 0.6 (2)s, respectively. The measured energy spectra of β-delayed protons and estimated proton branching ratios to the final states in "daughter" nuclei for the precursors ¹²⁵Nd, ¹²⁹Sm, ¹³⁷Gd and ¹³⁹Dy, as well as the previously reported ones for the precursors ¹³⁵Gd and ¹²¹Ce, were fitted by a statistical model calculation. The ground-state spins and parities of ¹²¹Ce, ¹²⁵Nd, ¹²⁹Sm, ¹³⁵Gd, ¹³⁷Gd and ¹³⁹Dy were then assigned as 5/2^± , 5/2^± , 1/2^± (or 3/2⁺) ,5/2⁺ ,7/2^± and 7/2, respectively. The consistency between the experimental spin-parity assignment and the predicted Nilsson diagrams indirectly indicates that the ground states of ¹²¹Ce, ¹²⁵Nd, ¹²⁹Sm, ¹³⁵Gd, ¹³⁷Gd and ¹³⁹Dy are highly deformed with β₂ [similar to] 0.3.
出版者	Science in China Press
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/64363]
专题	中国科学院近代物理研究所
作者单位	Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
推荐引用方式 GB/T 7714	Xu, Shuwei,Li, Zhankui,Xie, Yuanxiang,et al. New β-delayed proton decays in the rare-earth region near the proton drip line[J]. Science in China, Series A: Mathematics, Physics, Astronomy,2000,43:885-891.
APA	Xu, Shuwei.,Li, Zhankui.,Xie, Yuanxiang.,Yu, Yong.,Pan, Qiangyan.,...&Zhang, Tianmei.(2000).New β-delayed proton decays in the rare-earth region near the proton drip line.Science in China, Series A: Mathematics, Physics, Astronomy,43,885-891.
MLA	Xu, Shuwei,et al."New β-delayed proton decays in the rare-earth region near the proton drip line".Science in China, Series A: Mathematics, Physics, Astronomy 43(2000):885-891.