The g-factors and magnetic rotation in 82Rb

doi:10.1088/1674-1056/19/6/062701

中国物理B ›› 2010, Vol. 19 ›› Issue (6): 62701-062701.doi: 10.1088/1674-1056/19/6/062701

The g-factors and magnetic rotation in ⁸²Rb

袁大庆, 郑永男, 左翼, 范平, 周冬梅, 吴晓光, 竺礼华, 李广生, 许国基, 樊启文, 张锡珍, 朱升云

China Institute of Atomic Energy, Beijing 102413, China

收稿日期:2008-12-24 出版日期:2010-06-15 发布日期:2010-06-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos.~10435010 and 10375093).

The g-factors and magnetic rotation in ⁸²Rb

Yuan Da-Qing(袁大庆), Zheng Yong-Nan(郑永男), Zuo Yi(左翼), Fan Ping(范平), Zhou Dong-Mei(周冬梅), Wu Xiao-Guang(吴晓光), Zhu Li-Hua(竺礼华), Li Guang-Sheng(李广生), Xu Guo-Ji(许国基), Fan Qi-Wen(樊启文), Zhang Xi-Zhen(张锡珍), and Zhu Sheng-Yun(朱升云)^†

China Institute of Atomic Energy, Beijing 102413, China

Received:2008-12-24 Online:2010-06-15 Published:2010-06-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos.~10435010 and 10375093).

摘要/Abstract

摘要： The g-factors of the intra-band states 12, 13, 14, 15 in a magnetic-rotational band built on the 11 state in ⁸²Rb are measured for the first time by using a transient magnetic field-ion implantation perturbed angular distribution (TMF-IMPAD) method. The magnetic-rotational band in ⁸²Rb is populated by the ^{60}Ni(^{27}Al,4pn)^{ 82}Rb reaction, and the time-integral Larmor precessions are measured after recoil implantation into a polarized Fe foil. The calculation of g-factors is also carried out in terms of a semi-classical model of independent particle angular momentum coupling on the basis of the four-quasiparticle configuration \pi ( {g_{9 / 2} } )^2 \otimes \pi (p_{3 / 2} ,f_{5 / 2} ) \otimes \nu ≤ft( {g_{9 / 2} } \right). The measured and calculated g-factors are in good agreement with each other. The g-factors and deduced shear angles decrease with the increase of spin along the band. This clearly illustrates the shear effect of a step-by-step alignment of the valence protons and neutrons in magnetic rotation. The semi-classical calculation also shows that the alignment of the valence neutron angular momentum is faster than that of the valence protons, which results in a decrease of g-factors with increasing spin. The present results provide solid evidence of the shear mechanism of magnetic rotation.

Abstract: The g-factors of the intra-band states 12, 13, 14, 15 in a magnetic-rotational band built on the 11 state in ⁸²Rb are measured for the first time by using a transient magnetic field-ion implantation perturbed angular distribution (TMF-IMPAD) method. The magnetic-rotational band in ⁸²Rb is populated by the ⁶⁰Ni(²⁷Al,4pn)⁸²Rb reaction, and the time-integral Larmor precessions are measured after recoil implantation into a polarized Fe foil. The calculation of g-factors is also carried out in terms of a semi-classical model of independent particle angular momentum coupling on the basis of the four-quasiparticle configuration $\pi ( {g_{9 / 2} } )^2 \otimes \pi (p_{3 / 2} ,f_{5 / 2} ) \otimes \nu ( {g_{9 / 2} } )$. The measured and calculated g-factors are in good agreement with each other. The g-factors and deduced shear angles decrease with the increase of spin along the band. This clearly illustrates the shear effect of a step-by-step alignment of the valence protons and neutrons in magnetic rotation. The semi-classical calculation also shows that the alignment of the valence neutron angular momentum is faster than that of the valence protons, which results in a decrease of g-factors with increasing spin. The present results provide solid evidence of the shear mechanism of magnetic rotation.

Key words: ⁸²Rb, magnetic rotation, g-factor, TMF-IMPAD

中图分类号: (Electromagnetic moments)

21.10.Ky

21.10.Re (Collective levels) 25.75.-q (Relativistic heavy-ion collisions (collisions induced by light ions studied to calibrate relativistic heavy-ion collisions should be classified under both 25.75.-q and sections 13 or 25 appropriate to the light ions)) 21.10.Hw (Spin, parity, and isobaric spin) 21.60.-n (Nuclear structure models and methods) 27.50.+e (59 ≤ A ≤ 89)

袁大庆, 郑永男, 左翼, 范平, 周冬梅, 吴晓光, 竺礼华, 李广生, 许国基, 樊启文, 张锡珍, 朱升云. The g-factors and magnetic rotation in ⁸²Rb[J]. 中国物理B, 2010, 19(6): 62701-062701.

参考文献 19

[1]	Neffgen M, Baldsiefen G, Frauend? rf S, Grawe H, Heese J, H\"ubel H, Kluge H, Korichi A, Korten W, Maier K H, Mehta D, Meng J, Nenoff N, Piiparinen M, Sch\"onhofer M, Schubart R, van Severen U J, Singh N, Sletten G, Thirumala Rao B V and Willsau P 1995 Nucl. Phys. A 595 499
[2]	Hü bel H 2005 Progr. Part. Nucl. Phys. 54 1
[3]	Datta P, Chattopadhyay S, Banerjeeet P, Bhattacharya S, Dasmahapatra B, Ghosh T K, Goswami A, Pal S, Saha Sarkar M, Sen H S, Jain C, Joshi P K and Amita 2004 Phys. Rev . C 69 044317
[4]	Chmel S, Brandolini F, Ribas R V, Baldsiefen G, G\"orgen A, De Poli M, Pavan P and H\"ubel H 1997 Phys. Rev. Lett . 79 2002
[5]	Baldsiefen G, H\"ubel H, Korten W, Mehta D, Nenoff N, Thirumala Rao B V, Willsau P, Grawe H, Heese J, Kluge H, Maier K H, Schubart R, Frauendorf S and Maier H J 1994 Nucl. Phys . A 574 521
[6]	Frauendorf S 2001 Rev. Mod. Phys . 73 463
[7]	Macchiavelli A O, Clark R M, Fallon P, Deleplanque M A, Diamond R M, Kr\"ucken R, Lee I Y, Stephens F S, Asztalos S and Vetter K 1998 Phys. Rev . C 57 R1073
[8]	Clark R M and Macchiavelli A O 2000 Ann. Rev. Nucl. Part. Sci . 50 1
[9]	Schnare H, Schwengner R, Frauendorf S, D\"onau F, K\"aubler L, Prade H, Jungclaus A, Lieb K P, Lingk C, Skoda S, Eberth J, de Angelis G, Gadea A, Farnea E, Napoli D R, Ur C A and Lo Bianco G 1999 Phys. Rev. Lett . 82 4408
[10]	Schwengner R, Rainovski G, Schnare H, Wagner A, D\"onau F, Jungclaus A, Hausmann M, Iordanov O, Lieb K P, Napoli D R, de Angelis G, Axiotis M, Marginean N, Brandolini F and Rossi Alvarez C 2002 Phys. Rev . C 66 024310
[11]	D? ring J, Ulrich D, Johns G D, Johns G D, Riley M A and Tabor S L 1999 Phys. Rev. C 59 71
[12]	Zhu S Y, Luo O, Gou Z H, Zheng S G, Fan Z G, Li A L, Li G S, Wen S X, Dai Z Y, Liu X G and Wu X G 1996 Chin. J. Nucl. Phys. 18 171
[13]	Zhu S Y, Luo O, Li G S, Fan Z G, Xu Y J, Gao Z C, Wen S X, Wu X G, Liu X G, Xu G J, Zhu J Z, Chen Y S, Matsuta K, Fukuda M, Mihara M and Minamisono T 2000 Chin. Phys. Lett. 17 560
[14]	Tarasov O B and Bazin D 2003 Nucl. Inst. &Meth. Phys. Res. B 204 174
[15]	Omata K, Fujita Y, Yoshikawa N, Sekiguchi M and Shida Y 1991 Proc. IEEE 7th Real Time '91 on Computer Applications in Nuclear, Particle and Plasma Physics Jü lich, p.~243
[16]	Benczer-Koller, Hass N and Sak J 1980 Ann. Rec. Nucl. Part. Sci . 30 53
[17]	Shu N K B, Melnik D, Brennan J M, Brennan J M, Semmler W and Benczer-Koller N 1980 Phys. Rev. C 21 1828
[18]	Ribas R V 1993 Nucl. Instr. &Methods A 328 553
[19]	Speidl K H, Kenn O and Nowacki F 2005 Progr. Part. Nucl. Phys. 49 91

The g-factors and magnetic rotation in ⁸²Rb

The g-factors and magnetic rotation in ⁸²Rb

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