Examination of nuclear chirality with a magnetic moment measurement of the I=9 isomeric state in 128Cs

作者：Grodner, E.^*; Kowalczyk, M.; Kisielinski, M.; Srebrny, J.; Prochniak, L.; Droste, Ch; Rohozinski, S. G.; Chen, Q. B.; Ionescu-Bujor, M.; Ur, C. A.; Recchia, F.; Meng, J.; Zhang, S. Q.; Zhao, P. W.; Georgiev, G.; Lozeva, R.; Fiori, E.; Aydin, S.; Nalecz-Jawecki, A.

来源：Physical Review C - Nuclear Physics, 2022, 106(1): 014318.

DOI：10.1103/PhysRevC.106.014318

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The g factor of the isomeric I = 9(+) bandhead of the yrast states in Cs-128 is obtained from the time differential perturbed angular distribution measurement performed with the electromagnet at IPN Orsay. An external magnetic field of 2.146 T at the target position was attained with GAMIPE reaction chamber surrounded by four high-purity germanium detectors, of which two were low-energy photon spectrometer type. The results are in accordance with pi h(11/2) circle times nu h(11/)(2)(-1) I = 9(+) bandhead assignment and are discussed in the context of chiral interpretation of the Cs-128 nucleus as a composition of the odd proton, odd neutron, and even-even core with their angular momentum vectors. The obtained g-factor value was compared with predictions of the particle-rotor model. The experimental g factor corresponds to the nonchiral geometry of the isomeric bandhead. This observation indicates the existence of the chiral critical frequency in Cs-128 and may explain the absence of the chiral doublet members for I < 13<(h)over bar>.

• 单位
  北京大学; 北京航空航天大学; i