Nen β-Delayed Proton Decays in the Rare-Enrth Region Near the Proton Drip Line

XU Shu-Wei; LI Zhan-Kui; XIE Yuan-Xiang; YU Yong; PAN Qiang-Yan; WANG Chun-Fang; XING Jian-Ping; MA Rui-Chang; CE Yuan-Xiu; WANG Xu-Dong

Chinese Physics C> 2000, Vol. 24> Issue(S1) : 73-80

Nen β-Delayed Proton Decays in the Rare-Enrth Region Near the Proton Drip Line

Institute of Modern Physics,Tthe Chinese Acadmy of Sciences,Lanzhou 730000,China

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Abstract：
The β-delayed proton precursors ¹²⁵Nd,¹²⁸Pm,¹²⁹Sm,¹³⁷Gd and ¹³⁹Dy near the proton dripline 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 esimated 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 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,respectly.The consistency between the experimental spin-parity assignment and the predicted Nilsson diagrams indirectly indicates that ground states of ¹²¹Ce,¹²⁵Nd,¹²⁹Sm,¹³⁵Gd,¹³⁷Gd and ¹³⁹Dy are highly deformed with β₂～0.3.

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XU Shu-Wei, LI Zhan-Kui, XIE Yuan-Xiang, YU Yong, PAN Qiang-Yan, WANG Chun-Fang, XING Jian-Ping, MA Rui-Chang, CE Yuan-Xiu and WANG Xu-Dong. Nen β-Delayed Proton Decays in the Rare-Enrth Region Near the Proton Drip Line[J]. Chinese Physics C, 2000, 24(S1): 73-80.

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Received: 1900-01-01
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沈阳化工大学材料科学与工程学院沈阳 110142

Nen β-Delayed Proton Decays in the Rare-Enrth Region Near the Proton Drip Line

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Nen β-Delayed Proton Decays in the Rare-Enrth Region Near the Proton Drip Line

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