Spin Assignments of Superdeformed Bands in Europium

WU Chong-Shi; LI Zhong-Hua

Chinese Physics C> 2001, Vol. 25> Issue(2) : 121-128

Spin Assignments of Superdeformed Bands in Europium

WU Chong-Shi ^, ,
LI Zhong-Hua

Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, ChinaDepartment of Physics, Peking University, Beijing 100871, China

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Abstract：
A comprehensive investigation of the superdeformed bands observed in ^{142,143,144,147}Eu was given. The fluctuation in the transition energies has been removed. The smoothed transition energies were fitted by the ab-expression or its modification. The spins of these bands, except for band 4 of 147Eu, have been assigned conclusively. The exit spin in 143Eu was proud to be 29/2, different from that asserted to be determined experi- mentally but remains to be confirmed. The corresponding values in 142Eu and 144Eu(a) are 21 and 28, lower than those proposed in the literature by 6 and 8 units, respectively. Two pairs of superdeformed bands in 147 Eu, i. e. bands 1,5 and bands 2,3 were proposed to be signature partners. The exit spins are 53/2 and 63/2 for the former pair, and 43/2 and 41/2 for the latter pair. In addition, both of them have a rather large de-coupling constant(≈-1), implying they are of K=1/2 and built on the single particle level ν[651]↓ or π[530] ↑. This assignment may be helpful for the studies of the so-called identical bands and pseudospin problem. The signature partner pairs observed in 144,148Eu are not included in the investigation.

References

[1]

WU Chong–Shi. High Energy Phys. and Nucl. Phys., 1998, 22:71–77(in Chinese)(吴崇试. 高能物理与核物理,1998,22:71–77) 2 WU Chong–Shi, LI Zheng–Hua. High Energy Phys. and Nucl. Phys., 1999, 23: 797–802 (in Chinese )(吴崇试, 李中华高能物理与核物理,1999,23;797–802)3 WU Chong–Shi, ZHOU Zhi–Ning. High Energy Phys. and Nucl. Phys., 1999,23:1209–1215(in Chinese)(吴崇试,周治宁,高能物理与核物理,1999,23:1209–1215)4 WU Chong–Shi. High Energy Phys. and Nucl. Phys., 1998,22:48–53(in Chinese)(吴崇试. 高能物理与核物理,1998,22:48—53) 5 WU Chong–Shi. J. Ningxia Univ., (Nat. Sci. edition)., 1998, 19:297–299(in Chinese)(吴崇试. 宁夏大学学报(自然科学版),1998,19:297–299)6 LI Zhong–Hua, WU Chang–Shi. High Energy Phys. and Nucl, Phys., 2000, 24:71–76(in Chinese)(李中华,吴崇试. 高能物理与核物理,2000,24:71–76)7 HAN X L,WU C L. At. Data Nucl. Data Tables, 1999, 73:43–1508 WU Chong–Shi. High Energy Phys. and Nucl. Phys., 2000, 24:66–70(in Chinese)(吴崇试. 高能物理与核物理,2000,24:66–70)9 LI Z H, WU C S. Commun. Theor. Phys., 2000, 33:397–40410 Haslip D S, Knitz N, Flibotte S et al. Phys. Rev., 1998, C57:2196–220411 Atac A, Piiparinen M, Herskind B et al. Phys. Rev. Lett., 1993, 70:1069–107212 Lerma F, LaFosse D R, Devlin M et al. Phys. Rev., 1997, C56:R1671–1674 13 WU C S, CHENG L, LIN C Z et al. Phys. Rev., 1992, C45:2507–2510 14 Mullins S M, Flibotte S, Hackman G et al. Phys. Rev., 1995, C52:99–103

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WU Chong-Shi and LI Zhong-Hua. Spin Assignments of Superdeformed Bands in Europium[J]. Chinese Physics C, 2001, 25(2): 121-128.

WU Chong-Shi and LI Zhong-Hua. Spin Assignments of Superdeformed Bands in Europium[J]. Chinese Physics C, 2001, 25(2): 121-128. shu

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Received: 2000-01-04
Revised: 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

Spin Assignments of Superdeformed Bands in Europium

Corresponding author: WU Chong-Shi,

Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, ChinaDepartment of Physics, Peking University, Beijing 100871, China

Received Date: 2000-01-04

Accepted Date: 1900-01-01

Available Online: 2001-02-05

Abstract: A comprehensive investigation of the superdeformed bands observed in ^{142,143,144,147}Eu was given. The fluctuation in the transition energies has been removed. The smoothed transition energies were fitted by the ab-expression or its modification. The spins of these bands, except for band 4 of 147Eu, have been assigned conclusively. The exit spin in 143Eu was proud to be 29/2, different from that asserted to be determined experi- mentally but remains to be confirmed. The corresponding values in 142Eu and 144Eu(a) are 21 and 28, lower than those proposed in the literature by 6 and 8 units, respectively. Two pairs of superdeformed bands in 147 Eu, i. e. bands 1,5 and bands 2,3 were proposed to be signature partners. The exit spins are 53/2 and 63/2 for the former pair, and 43/2 and 41/2 for the latter pair. In addition, both of them have a rather large de-coupling constant(≈-1), implying they are of K=1/2 and built on the single particle level ν[651]↓ or π[530] ↑. This assignment may be helpful for the studies of the so-called identical bands and pseudospin problem. The signature partner pairs observed in 144,148Eu are not included in the investigation.

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