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

  • 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.
  • [1] Hofmann S. Radiochimica Acta, 1995, 70/71 : 932 Moller P, Nix J R, Myers W D et al. At. Data Nucl. Data Tables, 1995, 59:1853 XU Shu-Wei, XIE Yuan-Xi, LI Zhan-Kui et al. Z. Phys.,1996, M56:227; Science in China, 1997,A27(5) :434 (in Chinese)(徐树威,谢元祥,李占奎等.中国科学,1997,A,27(5):434)4 XU S W, LI Z K, XIE Y X et al. Phys. Rev., 1997, C60:061302(R)5 Larsson P O, Batisch T, Kirchner R et al. Z. Phys., 1983, A314 : 96 Livingston K, W d P J, Davis N J et al. Phys. Rev., 1993, C48:31137 Beraud R. Emsallem A, #196;kje J et al. Third INRP3-RIKEN Symposium on Heavy Ion Collisions, Tokyo, Japan, 1994,102; Workshop IGISOL-6,Dubna. Russia, 1997, 598 Iimura H, Katakura J, Kitao K et al. Nucl. Data Sheets, 1997, 80 :8959 Homsh#966;j P, Wilsky K, Hansen P G et al. Nucl. Phys., 1972, A187 :609; Hardy J C. Phys. Lett., 1982, B109: 24210 James A N, Momsm T P, Nolan P J et al. In: Eastham D A and Joy A eds. Nuclear Structure Appendix, Daresbury Annual Report 1985/86. Warrington, UK: Daresbury Laboratory. 1986, 10311 Mascrop R, Campbell M, Gelletly W et al. Nucl. Phys., 1989, A499 : 56512 Paul E S, Davis S, Vaska P et al., J. Physics (Landon), 1993, G19:86113 Nitschke J M, Cable M D, Zeite W D. Z. Phys., 1983, A312:26514 Lister C J, Varley B J, Moscrop R et al. Phys. Rev. Lett, 1985, 55: 81015 XU Shu-Wei, XIE Yuan-Xiang, LI Zhan-Kui et al. Phys. Rev., 1997, C56: 1157; XU Shu-Wei, XIE Yuan-Xiang, LI Zhan-Kui et al. Science in China, 1998,A28(5) :433(in Chinese)(徐树威,谢元祥,李占奎等.中国科学,1998,A,28(5): 433)16 Takahashi K, Yamada M, Kondoh T. At. Data Nucl. Data Tables; 1973, 12: 10117 Horiguchi T, Tachibana T, Katakuxa J. Charts of the Nuclides, 199618 Hirsch M, Staudt A, Muto K et al. At. Data Nucl. Data Tables, 1993, 53: 16519 Moller P, Nix J R, Kratz K-L. At. Data Nucl. Data Tables, 1997, 66 : 13120 Winn W G, Gutbd H H, Blann M. Nucl. Phys., 1972, A188:42321 Arseniev D A, Sobiczewski A, Solview V G. Nucl. Phys., 1969, A126 : 1522 BengtsonT, Ragnarsson I. Nucl. Phys., 1985, A436:14; Firestone R B. Table of Isotopes, 8th ed. 1996, Vol. Ⅱ,Appedix H, H-7 and H-823 Audi G. Bersillon O, Blachot J et al. Nucl. Phys., 1997, A624:1
  • [1] Hofmann S. Radiochimica Acta, 1995, 70/71 : 932 Moller P, Nix J R, Myers W D et al. At. Data Nucl. Data Tables, 1995, 59:1853 XU Shu-Wei, XIE Yuan-Xi, LI Zhan-Kui et al. Z. Phys.,1996, M56:227; Science in China, 1997,A27(5) :434 (in Chinese)(徐树威,谢元祥,李占奎等.中国科学,1997,A,27(5):434)4 XU S W, LI Z K, XIE Y X et al. Phys. Rev., 1997, C60:061302(R)5 Larsson P O, Batisch T, Kirchner R et al. Z. Phys., 1983, A314 : 96 Livingston K, W d P J, Davis N J et al. Phys. Rev., 1993, C48:31137 Beraud R. Emsallem A, #196;kje J et al. Third INRP3-RIKEN Symposium on Heavy Ion Collisions, Tokyo, Japan, 1994,102; Workshop IGISOL-6,Dubna. Russia, 1997, 598 Iimura H, Katakura J, Kitao K et al. Nucl. Data Sheets, 1997, 80 :8959 Homsh#966;j P, Wilsky K, Hansen P G et al. Nucl. Phys., 1972, A187 :609; Hardy J C. Phys. Lett., 1982, B109: 24210 James A N, Momsm T P, Nolan P J et al. In: Eastham D A and Joy A eds. Nuclear Structure Appendix, Daresbury Annual Report 1985/86. Warrington, UK: Daresbury Laboratory. 1986, 10311 Mascrop R, Campbell M, Gelletly W et al. Nucl. Phys., 1989, A499 : 56512 Paul E S, Davis S, Vaska P et al., J. Physics (Landon), 1993, G19:86113 Nitschke J M, Cable M D, Zeite W D. Z. Phys., 1983, A312:26514 Lister C J, Varley B J, Moscrop R et al. Phys. Rev. Lett, 1985, 55: 81015 XU Shu-Wei, XIE Yuan-Xiang, LI Zhan-Kui et al. Phys. Rev., 1997, C56: 1157; XU Shu-Wei, XIE Yuan-Xiang, LI Zhan-Kui et al. Science in China, 1998,A28(5) :433(in Chinese)(徐树威,谢元祥,李占奎等.中国科学,1998,A,28(5): 433)16 Takahashi K, Yamada M, Kondoh T. At. Data Nucl. Data Tables; 1973, 12: 10117 Horiguchi T, Tachibana T, Katakuxa J. Charts of the Nuclides, 199618 Hirsch M, Staudt A, Muto K et al. At. Data Nucl. Data Tables, 1993, 53: 16519 Moller P, Nix J R, Kratz K-L. At. Data Nucl. Data Tables, 1997, 66 : 13120 Winn W G, Gutbd H H, Blann M. Nucl. Phys., 1972, A188:42321 Arseniev D A, Sobiczewski A, Solview V G. Nucl. Phys., 1969, A126 : 1522 BengtsonT, Ragnarsson I. Nucl. Phys., 1985, A436:14; Firestone R B. Table of Isotopes, 8th ed. 1996, Vol. Ⅱ,Appedix H, H-7 and H-823 Audi G. Bersillon O, Blachot J et al. Nucl. Phys., 1997, A624:1
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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.
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. shu
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Nen β-Delayed Proton Decays in the Rare-Enrth Region Near the Proton Drip Line

    Corresponding author: XU Shu-Wei,
  • Institute of Modern Physics,Tthe Chinese Acadmy of Sciences,Lanzhou 730000,China

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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