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

Abstract
HTML
Reference
Related

PDF

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

[1]	DONG Bao-Guo , MA Hai-Liang . Superdeformed Band Terminations in the A=40 Mass Region. Chinese Physics C, 2006, 30(S2): 106-108.
[2]	LI Ming-Liang , ZHU Sheng-Jiang . Property Analysis and Spin Assignments Superdeformed Bands in A≈150 Region. Chinese Physics C, 2006, 30(11): 1078-1082.
[3]	YU Shao-Ying , TU Ya , CHEN Yong-Shou , SHEN Cai-Wan . Theoretical Research on Traxial Superdeformed Band and High Spin State Nuclei in ¹⁶⁸Lu. Chinese Physics C, 2005, 29(3): 258-262.
[4]	LI Ming-Liang , ZHU Sheng-Jiang , XU Fu-Xin . Comparative Assignments of Spin of Superdeformed Bands. Chinese Physics C, 2005, 29(10): 954-959.
[5]	DI Yao-Min . Analysis by Synthesis of the Spin Assignment for the Superdeformed Single Bands in A≈190 Odd Nuclei. Chinese Physics C, 2003, 27(6): 503-506.
[6]	DI Yao-Min . Discussion of Spin Assignment of the Signature Partner Bands in Odd-A Superdeformed Nuclei in A≈190 Region. Chinese Physics C, 2003, 27(3): 227-232.
[7]	DI Yao-Min . Synthetical Analysis of the Spin Assignment for the Superdeformed Bands in A≈190 Region. Chinese Physics C, 2002, 26(5): 507-515.
[8]	FANG Xiang-Zheng , RUAN Tu-Nan . Phenomenological Description of Superdeformed Bands. Chinese Physics C, 2001, 25(4): 315-321.
[9]	GUO Jian-You , XU Fu-Xin , RUAN Tu-Nan . Further Discussion on the Spin-Determination of Superdeformed Bands in the A～190 Region. Chinese Physics C, 2001, 25(6): 514-520.
[10]	LIU Yu-Xin . Algebraic Model Description of High Spin Superdeformed Bands. Chinese Physics C, 2000, 24(S1): 50-53.
[11]	LI ZhongHua , WU ChongShi . Elimination of the Fluctuation in the Observed Transition Energies and Spin Assignments of the Superdeformed Bands in A≈150 Region. Chinese Physics C, 2000, 24(1): 71-76.
[12]	Liu Shuxin , Zeng Jinyan . Bandhead Moments of Inertia Systematics and Systematic Spin Assignments of Superdeformed Bands in A≈190 Region. Chinese Physics C, 1999, 23(7): 701-708.
[13]	Wu Chongshi , Zhou Zhining . Re-discussion of the Spin Assignments of the Superdeformed Bands in A≈190 Region (Ⅲ) Doubly Odd Superdeformed Nuclei. Chinese Physics C, 1999, 23(12): 1209-1215.
[14]	Wu Chongshi , Li Zhonghua . Re-discussion of the Spin Assignments of the Superdeformed Bands in A≈190 Region (Ⅱ) Odd Superdeformed Nuclei. Chinese Physics C, 1999, 23(8): 797-802.
[15]	Wu Chongshi . Improvement of the Spin Assignment of the Superdeformed Band──Elimination of the ΔI-4 Bifurcation. Chinese Physics C, 1998, 22(1): 48-54.
[16]	Wu Chongshi . Re-Discussion of the Spin Assignments of the Superdeformed Bands in A～190 Region (I) Even-Even Superdeformed Nuclei. Chinese Physics C, 1998, 22(1): 71-77.
[17]	Lei Yian , Lin Chunzhen , Zeng Jinyan . Comparison of the Spin Assignment and Experimental Determination of Superdeformed Bands. Chinese Physics C, 1997, 21(7): 648-656.
[18]	Xing Zheng , Chen Xingqu . Analysis of Identical Bands for Odd-A Superdeformed Nuclei in A～190 Mass Region. Chinese Physics C, 1995, 19(4): 354-358.
[19]	Xing Zheng , Wang Yangli , Chen Xingqu . A Simple Two-Band Mixing Model of Superdeformed Bands. Chinese Physics C, 1994, 18(1): 62-67.
[20]	CHEN Xing-Qu , XING Zheng . Phenomenological Analysis and Determination of Spins for Superdeformed Bands in the Mass-190 Region. Chinese Physics C, 1991, 15(12): 1094-1100.

Access

Get Citation

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

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

Received: 2000-01-04
Revised: 1900-01-01

Article Metric

Article Views(2742)
PDF Downloads(585)
Cited by(0)

Policy on re-use

To reuse of subscription content published by CPC, the users need to request permission from CPC, unless the content was published under an Open Access license which automatically permits that type of reuse.

通讯作者: 陈斌, bchen63@163.com

1.
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.

HTML

Reference (1)

Spin Assignments of Superdeformed Bands in Europium

Abstract：

References

Access

Article Metrics

Metrics

通讯作者: 陈斌, bchen63@163.com

Email This Article