4.5 Article

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

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PHYSICAL REVIEW C
卷 106, 期 1, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.106.014318

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资金

  1. Polish National Science Centre (NCN) [2013/10/M/ST2/00427]
  2. Polish-French Collaboration COPIN-IN2P3 [06-121]
  3. National Key R&D Program of China [2018YFA0404400, 2017YFE0116700]
  4. National Natural Science Foundation of China [12070131001, 11875075, 11935003, 11975031]

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The g factor of the isomeric I = 9(+) bandhead of Cs-128 was obtained through experimental measurements and compared with the particle-rotor model. The results suggest that Cs-128 exhibits a nonchiral geometry for the isomeric bandhead and has a chiral critical frequency.
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>.

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