Observation of Spin-Dependent Charge Symmetry Breaking in Λn Interaction: Gamma-Ray Spectroscopy of He Λ4

(J-PARC E13 Collaboration)

研究成果: Article査読

54 被引用数 (Scopus)

抄録

The energy spacing between the spin-doublet bound state of HeΛ4(1+,0+) was determined to be 1406±2±2 keV, by measuring γ rays for the 1+→0+ transition with a high efficiency germanium detector array in coincidence with the He4(K-,π-)HeΛ4 reaction at J-PARC. In comparison to the corresponding energy spacing in the mirror hypernucleus HΛ4, the present result clearly indicates the existence of charge symmetry breaking (CSB) in ΛN interaction. By combining the energy spacings with the known ground-state binding energies, it is also found that the CSB effect is large in the 0+ ground state but is vanishingly small in the 1+ excited state, demonstrating that the ΛN CSB interaction has spin dependence.

本文言語English
論文番号222501
ジャーナルPhysical review letters
115
22
DOI
出版ステータスPublished - 2015 11 24

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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