ProbingMo93mIsomer Depletion with an Isomer Beam,Physical Review Letters

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ProbingMo93mIsomer Depletion with an Isomer Beam
Physical Review Letters ( IF 8.6 ) Pub Date : 2022-06-17 , DOI: 10.1103/physrevlett.128.242502
S Guo _{1,

2} , B Ding _{1,

2} , X H Zhou _{1,

2} , Y B Wu ₃ , J G Wang _{1,

2} , S W Xu _{1,

2} , Y D Fang _{1,

2} , C M Petrache ₄ , E A Lawrie _{5,

6} , Y H Qiang ₁ , Y Y Yang _{1,

2} , H J Ong _{1,

2,

7,

8} , J B Ma _{1,

2} , J L Chen _{1,

2} , F Fang _{1,

2} , Y H Yu _{1,

2} , B F Lv ₁ , F F Zeng ₁ , Q B Zeng ₁ , H Huang ₁ , Z H Jia ₁ , C X Jia ₁ , W Liang ₉ , Y Li ₉ , N W Huang ₁₀ , L J Liu ₁₀ , Y Zheng _{1,

2} , W Q Zhang _{1,

2} , A Rohilla ₁ , Z Bai _{1,

2} , S L Jin _{1,

2} , K Wang _{1,

2} , F F Duan _{1,

2} , G Yang _{1,

2} , J H Li ₁ , J H Xu ₁ , G S Li _{1,

2} , M L Liu _{1,

2} , Z Liu _{1,

2} , Z G Gan _{1,

2} , M Wang _{1,

2} , Y H Zhang _{1,

2}

Affiliation

Key Laboratory of High Precision Nuclear Spectroscopy, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China.
School of Nuclear Science and Technology, University of Chinese Academy of Science, Beijing 100049, People's Republic of China.
Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany.
University Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France.
iThemba LABS, National Research Foundation, P.O. Box 722, 7131 Somerset West, South Africa.
Department of Physics and Astronomy, University of the Western Cape, P/B X17, Bellville ZA-7535, South Africa.
Joint Department for Nuclear Physics, Lanzhou University and Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
Research Center for Nuclear Physics, Osaka University, Osaka 567-0047, Japan.
Hebei University, Baoding 071001, People's Republic of China.
Department of Physics, Huzhou University, Huzhou 313000, China.

The isomer depletion of

{}^{93 m}{Mo}

was recently reported [Chiara et al., Nature (London) 554, 216 (2018)] as the first direct observation of nuclear excitation by electron capture (NEEC). However, the measured excitation probability of 1.0(3)% is far beyond the theoretical expectation. In order to understand the inconsistency between theory and experiment, we produce the

{}^{93 m}{Mo}

nuclei using the

{}^{12}C ({}^{86}{Kr}, 5 n)

reaction at a beam energy of 559 MeV and transport the reaction residues to a detection station far away from the target area employing a secondary beam line. The isomer depletion is expected to occur during the slowdown process of the ions in the stopping material. In such a low

γ

-ray background environment, the signature of isomer depletion is not observed, and an upper limit of

2 \times 10^{- 5}

is estimated for the excitation probability. This is consistent with the theoretical expectation. Our findings shed doubt on the previously reported NEEC phenomenon and highlight the necessity and feasibility of further experimental investigations for reexamining the isomer depletion under low