Two new excited bands built on the πh11/2 configuration have been identified in Nd135 in addition to the known πh11/2 band. The energy spectra of the excited bands and the available electromagnetic transition probabilities are in good agreement with theoretical results obtained using quasiparticle-plus-triaxial-rotor model calculations. The properties of the bands identify them as tilted precession bands instead of wobbling bands. Our results give a new insight into the interpretation of the low-lying bands in odd-A mass nuclei, and can stimulate future studies to address the nuclear triaxiality.
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The authors thank Dr. Q. B. Chen for very useful discussions. This work has been supported by the Academy of Finland under the Finnish Centre of Excellence Programme (2012–2017); by the Special Research Assistant Project of the Chinese Academy of Sciences; by the EU 7th Framework Programme Project No. 262010 (ENSAR); by the National Research Foundation of South Africa (Grants No. 116666 and No. 109134), and by the French Ministry of Foreign Affairs and the Ministry of Higher Education and Research, France (PHC PROTEA Grant No. 42417SE); by the National Research, Development and Innovation Fund of Hungary (Project No. K128947), as well as by the European Regional Development Fund (Contract No. GINOP-2.3.3-15-2016-00034); by the Polish National Science Centre (NCN) Grant No. 2013/10/M/ST2/00427; by the Swedish Research Council under Grant No. 621-2014-5558; and by the National Natural Science Foundation of China (Grants No. 11505242, No. 11305220, No. U1732139, No. 11775274, and No. 11575255). The use of germanium detectors from the GAMMAPOOL is acknowledged. I.K. was supported by National Research, Development and Innovation Office-NKFIH, contract No. PD 124717.
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