First Observation of the ΛN Tensor Interaction

ZHOU Shu-Hua; ZHOU Jing; MENG Qiu-Ying

Chinese Physics C> 2005, Vol. 29> Issue(7) : 627-631

First Observation of the ΛN Tensor Interaction

China Institute of Atomic Energy,Beijing 102413,China2 Department of Physics,Tohoku University,Sendai 980-8578,Japan3 Department of Physics Osaka University,Toyonaka 5560-0043,Japan4 Department of Physics Kyoto University,Kyoto 606-85023,Japan5 Brookhaven National Laboratory,Upton,New York 11973,USA6 GSI,Darmstadt D-64291,Germany7 Carnegie Mellon University,Pittsburgh,Pennsylvania 15213,USA8 Department of Physics,University of Freiburg,Freiburg 79104,Germany9 Institute of Particle and Nuclear Studies,KEK,Tsukuba 305-0801,Japan10 Dapartment of Physics,Gifu University,Gifu 501-1193,Japan11 Dapartment of Physics,Hampton University,Hampton,Virginia 23668,USA12 RIKEN,Wako 351-0198,Japan

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Abstract：
In a 16ΛO γ-ray spectroscopy experiment with HYPERBALL, two γ-ray transitions from the 6.6MeV excited 1－2 state to both ground-states spin-doublet members 1－1 and 0－ have been observed. The measured ground-state doublet spacing is 26.4 ± 1.6(stat) ± 0.5(syst)keV. Thus a small but nonzero strength of the tensor interaction between a Λ and a nucleon is deduced to be T=+0.03MeV. The excitation energy of the 1－2 state is also determined to be 6561.7 ± 1.1(stat) ± 1.7(syst) keV.

References

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ZHOU Shu-Hua, ZHOU Jing and MENG Qiu-Ying. First Observation of the ΛN Tensor Interaction[J]. Chinese Physics C, 2005, 29(7): 627-631.

ZHOU Shu-Hua, ZHOU Jing and MENG Qiu-Ying. First Observation of the ΛN Tensor Interaction[J]. Chinese Physics C, 2005, 29(7): 627-631. shu

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Received: 2005-01-21
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

First Observation of the ΛN Tensor Interaction

Corresponding author: ZHOU Shu-Hua,

China Institute of Atomic Energy,Beijing 102413,China2 Department of Physics,Tohoku University,Sendai 980-8578,Japan3 Department of Physics Osaka University,Toyonaka 5560-0043,Japan4 Department of Physics Kyoto University,Kyoto 606-85023,Japan5 Brookhaven National Laboratory,Upton,New York 11973,USA6 GSI,Darmstadt D-64291,Germany7 Carnegie Mellon University,Pittsburgh,Pennsylvania 15213,USA8 Department of Physics,University of Freiburg,Freiburg 79104,Germany9 Institute of Particle and Nuclear Studies,KEK,Tsukuba 305-0801,Japan10 Dapartment of Physics,Gifu University,Gifu 501-1193,Japan11 Dapartment of Physics,Hampton University,Hampton,Virginia 23668,USA12 RIKEN,Wako 351-0198,Japan

Received Date: 2005-01-21
Accepted Date: 1900-01-01
Available Online: 2005-07-05

Abstract: In a 16ΛO γ-ray spectroscopy experiment with HYPERBALL, two γ-ray transitions from the 6.6MeV excited 1－2 state to both ground-states spin-doublet members 1－1 and 0－ have been observed. The measured ground-state doublet spacing is 26.4 ± 1.6(stat) ± 0.5(syst)keV. Thus a small but nonzero strength of the tensor interaction between a Λ and a nucleon is deduced to be T=+0.03MeV. The excitation energy of the 1－2 state is also determined to be 6561.7 ± 1.1(stat) ± 1.7(syst) keV.