HAO Xin1**, ZHU Li-Hua2,1, WU Xiao-Guang3, HE Chuang-Ye3, ZHENG Yun3, LI Li-Hua3, SUN Hui-Bin1, LI Guang-Sheng3
1College of Physics and Technology, Shenzhen University, Shenzhen 518060 2School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191 3China Institute of Atomic Energy, Beijing 102413
Shape Evolution in Rotating 178Os
HAO Xin1**, ZHU Li-Hua2,1, WU Xiao-Guang3, HE Chuang-Ye3, ZHENG Yun3, LI Li-Hua3, SUN Hui-Bin1, LI Guang-Sheng3
1College of Physics and Technology, Shenzhen University, Shenzhen 518060 2School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191 3China Institute of Atomic Energy, Beijing 102413
摘要In order to investigate the evolution of X(5) in rotating 178Os, an experiment populating 178Os via the fusion evaporation reaction 154Sm(29Si,5n)178Os was performed at the HI−13 tandem accelerator at the China Institute of Atomic Energy (CIAE). Lifetimes of excited states above 8+ in the yrast band in 178Os have been measured using the Doppler shift attenuation method. Lifetimes above 12+ states were measured for the first time. The deduced transitional quadruple moments (Qt), together with the previous data using the recoil distance Doppler shift (RDDS) method are compared with theoretical calculations based on the X(5) model and the interaction Boson model (IBM). Above the 10+ states, the Qt values fit well with the X(5) predictions. The present result suggests that the shape of a nucleus 178Os keeps X(5) critical point symmetry as spin increases to at least 14+. The shape change of 178Os with spin increasing is similar to that of 176Os.
Abstract：In order to investigate the evolution of X(5) in rotating 178Os, an experiment populating 178Os via the fusion evaporation reaction 154Sm(29Si,5n)178Os was performed at the HI−13 tandem accelerator at the China Institute of Atomic Energy (CIAE). Lifetimes of excited states above 8+ in the yrast band in 178Os have been measured using the Doppler shift attenuation method. Lifetimes above 12+ states were measured for the first time. The deduced transitional quadruple moments (Qt), together with the previous data using the recoil distance Doppler shift (RDDS) method are compared with theoretical calculations based on the X(5) model and the interaction Boson model (IBM). Above the 10+ states, the Qt values fit well with the X(5) predictions. The present result suggests that the shape of a nucleus 178Os keeps X(5) critical point symmetry as spin increases to at least 14+. The shape change of 178Os with spin increasing is similar to that of 176Os.
[1] Iachello F 2000 Phys. Rev. Lett. 85 3580
[2] Iachello F 2001 Phys. Rev. Lett. 87 052502
[3] Casten R F, Zamfir N V 2001 Phys. Rev. Lett. 87 052503
[4] Krucken R, Albanna B, Bialik C, Casten R F, Cooper J R, Dewald A, Zamfir N V, Barton C J, Beausang C W, Caprio M A, Hecht A A, Klug T, Novak J R, Pietralla N and Brentano P Von 2002 Phys. Rev. Lett. 88 232501
[5] Tonev D, Dewald A, Klug T, Petkov P, Jolie J, Fitzler A, Moller O, Heinze S, Brentano P Von and Casten R F 2004 Phys. Rev. C 69 034334
[6] Hutter C, Krucken R, Aprahamian A, Barton C J, Beausang C W et al 2003 Phys. Rev. C 67 054315
[7] McCutchan E A, Zamfir N V, Casten R F, Caprio M A, Ai H, Amro H, Beausang C W, Hecht A A, Meyer D A and Ressler J J 2005 Phys. Rev. C 71 024309
[8] Dewald A, Moller O, Saha B, Jessen K, Fitzler A, Melon B et al 2005 J. Phys. G 31 S1427
[9] Zamfir N V, von Brentano P, Casten R F and Jolie J 2002 Phys. Rev. C 66 021304
[10] Werner V, von Brentano P, Casten R F and Jolie J 2002 Phys. Lett. B 527 55
[11] http://radware.phy.ornl.gov/
[12] Casten R F, Brenner D S and Haustein P E 1987 Phys. Rev. Lett. 58 658
[13] Moller O, Petkov P, Melon B, Dewald, Fitzler A, Jolie J, Tonev D, Christen S, Saha B, Zell K O and Heidemann M 2005 Phys. Rev. C 72 034306
[14] Gascon J, Yu C H, Hagemann G B, Carpenter M C, Espino J M, Iwata Y, Komatsubara T, Nyberg J, Ogaza S, Sletten G, Tjom P O and Radford D C 1990 Nucl. Phys. A 513 344
[15] Zieglers, Biersack and Littmark 1985 The Stopping Power and Range of Ions in Matter (New York: Pergamon) vol 1
[16] Nazarewicz W and Ragnarsson I 1996 Handbook on Nuclear Properties (Oxford: Clarendon)
[17] Bonatsos D, Lenis D, Minkov N, Raychev P P and Terziev P A 2004 Phys. Rev. C 69 014302
[18] Iachello F, Arima A 1978 The Interacting Boson Model (Cambridge: Cambridge University)
[19] Regan P H 2003 Phys. Rev. Lett. 90 152502
[20] Hao X, Zhu L H, Wu X G, He C Y, Pan B, Zheng Y, Wang L L, Wang L, Li X Q, Liu Y, Ding H B, Li Z Y, Zhang J F, Sun H B and Li G S 2011 J. Phys. G 38 025102
MA Ke-Yan, LU Jing-Bin, YANG Dong, LI Jian, WANG Hui-Dong, LIU Yun-Zuo, WU Xiao-Guang, ZHU Li-Hua, ZHENG Yun, HE Chuang-Ye. High Spin States of 113In[J]. 中国物理快报, 2012, 29(6): 62102-062102.
[15]
WANG Lie-Lin, LU Jing-Bin, YANG Dong, MA Ke-Yan, ZHOU Yin-Hang, YIN Li-Chang, WU Xiao-Guang, WEN Shu-Xian, LI Guang-Sheng, YANG Chun-Xiang. High-Spin Structure in Odd-Odd 160Lu Nucleus[J]. 中国物理快报, 2012, 29(6): 62103-062103.
2011, Vol. 28 
