Korichi A, Wilson A N, Hannachi F, Lopez-Martens A, Rejmund M, Schück C, Vieu C, Chmel G, Görgen A, Hübel H, Rossbach D, Schönwasser S, Bergström M, Nyakó B M, Timár J, Bazzacco D, Lunardi S, Rossi-Alvarez C, Bednarczyk P, Kintz N, Naguleswaran S, Astier A, Cullen D M, Sharpey-Schafer J F, Lauritsen T, Wadsworth R
Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, IN2P3-CNRS et université Paris XI, F-91405 Orsay cedex, France.
Phys Rev Lett. 2001 Mar 26;86(13):2746-9. doi: 10.1103/PhysRevLett.86.2746.
The linear polarization of gamma rays between excited and yrast superdeformed (SD) states in 190Hg was measured using the four-element CLOVER detectors of the EUROBALL IV gamma-ray spectrometer. This measurement shows in a model-independent way that the interband transitions which compete with the highly collective in-band quadrupole transitions are largely enhanced electric dipoles. Not only do these results represent the first measurement of the multipolarity of transitions between different SD states, but they also provide strong evidence for the interpretation of the structures in the SD minimum of the A approximately 190 region in terms of octupole excitations.
利用欧洲球IV型γ射线谱仪的四元件CLOVER探测器，测量了190Hg中激发态与yrast超形变（SD）态之间γ射线的线性极化。该测量以一种与模型无关的方式表明，与高度集体性的带内四极跃迁相竞争的带间跃迁主要是增强电偶极跃迁。这些结果不仅是对不同SD态之间跃迁多极性的首次测量，而且还为用八极激发来解释A约为190区域SD极小值处的结构提供了有力证据。
