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Chinese Physics C> 2000, Vol. 24> Issue(5) : 418-425 

Octupole Deformation in Neutron Rich 145,147 La Nuclei

  •  Department of Physics, Tsinghua University, Beijing, 100084, China2 Department of Physics, Vanderbilt University, Nashville, TN 37235, USA3 Department of Physics, Mississippi State University, MS 39762, USA4 Idaho National Engineering Laboratory, Idaho Falls, ID 83415, USA5 Lawrence Berkeley Laboratory, Berkeley, CA 94720, USA6 Joint Institute for Nuclear Research, Dubna 141980, Russia

  • The level schemes with high spin states in neutron-rich145,147La nuclei have been established from the study of prompt γ-rays emitted in the spontaneous fission of 252Cf. Many new levels and γ transitions have been idenfified. The highest spin states in both nuclei were expanded up to(41/2+)and (43/2－)respectively. The alternating parity band structures and strong E1 transitions between negative-and positive-parity bands show strong octupole deformation. The collective bands observed in 145La give evidence for co-existence and competition between symmetric and asymmetric shapes. From the systematic comparison with the neighboring isotones, the s=+i bands in both nuclei most probably originate from the single particle πh11/2 orbital coupling with the neighboring even-even cores, respectively. Band crossing of the πh11/2 bands was found aroundω≈0.26—0.30MeV and these backbends are related to the alignment of two i13/2 neutrons from cranked shell model calculations.
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    [1] Nazarewicz W. Olanders P. Ragnarsson I et al. Nucl. Phys，1984, A429:269[2] Nazarewiri W, Olanders P. Nucl. Phys，1985, A441:420[3] Leander G A, Nazarewicz W, Olanders P et al. Phys. Lett.，1985, 8152;284[4] 7H11 ShenqJiang. Trends in Nucl. Phys，1992, 9(2):8 (朱胜江.核物理动态,1992,9(2):8)[5] ZHU ShengJiang, Lee. 1 Y. High Energy Phys. and Nucl. Phys. (in Chinese),1993, 17:353 (朱胜江，Lee. 1. Y.高能物理与核物理,1993.17:353)[6] Hamilton J H, Rarrrayya A V, Zhu 5 J et al. Prog. Part. Nucl. Phys.，1995, 35:635[7] 13entaleb M, Schulz N, Lubkiewiu et al. Z. Phys.,1994, A348:245[8] Zhu S J, Hanulton J H, Ramayya A V et al. J. Phys,1997, G23:L77[9] Zhu S J，Wang M G, Hamiltcm J H et al. Chin. Phys. Lett.,1997. 14:569[10] Zhu S J, Lu Q H, Hamilton J H et al. Phys Lett.1995, 8357;273[11] ilrban W, Jones M A, Durell J L et al. Nucl. Phys..1997, A613:107[12] Jones M A, Urban W, Durell J L et al. Nucl. Phys..1996, A605:133[13] Phillips W R, Ahmad I, Emling H et al. Phys. Rev. Lett..1986, 57:3257[14] ZHC: LingYan. ZHU ShengJiang, LI Ming et al. High Energy Phys and Nucl.Phys. (in Chinese).1998, 22:885 (朱凌燕，朱胜江.李明等高能物理与核物理,1998.22:885)[15] Phillips W R, Janssetu R V F, Ahrnad 1 et al. Phys. Lett,198ti,B212:402[16] Pfeiffer 13 et al. Z. Phys..1978, A287:191[17] Mateosian E D, Peker L A. Nucl. Data Sheets, 1992, 66:712[18] WANG MuGe. Research on High Spin States in Neutron-Rich 145,147 La Nuclei,Thesis for Master Degree, Tsinqhua University, 1996, 6(王牧歌,丰中子核 145,147 La 高自旋嚎谕究.油华大学硕士学位论文.1996.6)[19] urban w, Phillips w R. Durell J L et al. Phys.Rev.,1997,C54;945[20] Arvaeineia R J , Cole J D. Greenwood R C et al. Phys Rev.,1993, 048:566

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ZHU ShengJiang, WANG MuGe, ZHU LingYan, LI Ming, GAN CuiYun, YANG LiMing, M Sakhaee, Pau Sanli, DENG JingKang and LONG GuiLu. Octupole Deformation in Neutron Rich 145,147 La Nuclei[J]. Chinese Physics C, 2000, 24(5): 418-425.
ZHU ShengJiang, WANG MuGe, ZHU LingYan, LI Ming, GAN CuiYun, YANG LiMing, M Sakhaee, Pau Sanli, DENG JingKang and LONG GuiLu. Octupole Deformation in Neutron Rich 145,147 La Nuclei[J]. Chinese Physics C, 2000, 24(5): 418-425. shu
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Received: 1999-03-02
Revised: 1900-01-01
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Octupole Deformation in Neutron Rich 145,147 La Nuclei

    Corresponding author: ZHU ShengJiang,
  • Department of Physics, Tsinghua University, Beijing, 100084, China2 Department of Physics, Vanderbilt University, Nashville, TN 37235, USA3 Department of Physics, Mississippi State University, MS 39762, USA4 Idaho National Engineering Laboratory, Idaho Falls, ID 83415, USA5 Lawrence Berkeley Laboratory, Berkeley, CA 94720, USA6 Joint Institute for Nuclear Research, Dubna 141980, Russia
  • Received Date: 1999-03-02
  • Accepted Date: 1900-01-01
  • Available Online: 2000-04-05

Abstract: The level schemes with high spin states in neutron-rich145,147La nuclei have been established from the study of prompt γ-rays emitted in the spontaneous fission of 252Cf. Many new levels and γ transitions have been idenfified. The highest spin states in both nuclei were expanded up to(41/2+)and (43/2－)respectively. The alternating parity band structures and strong E1 transitions between negative-and positive-parity bands show strong octupole deformation. The collective bands observed in 145La give evidence for co-existence and competition between symmetric and asymmetric shapes. From the systematic comparison with the neighboring isotones, the s=+i bands in both nuclei most probably originate from the single particle πh11/2 orbital coupling with the neighboring even-even cores, respectively. Band crossing of the πh11/2 bands was found aroundω≈0.26—0.30MeV and these backbends are related to the alignment of two i13/2 neutrons from cranked shell model calculations.

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