@article{8ef7766cf3cd4555af07e28d9303213d,
title = "Observation of Spin-Dependent Charge Symmetry Breaking in Λn Interaction: Gamma-Ray Spectroscopy of He Λ4",
abstract = "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.",
author = "{(J-PARC E13 Collaboration)} and Yamamoto, {T. O.} and M. Agnello and Y. Akazawa and N. Amano and K. Aoki and E. Botta and N. Chiga and H. Ekawa and P. Evtoukhovitch and A. Feliciello and M. Fujita and T. Gogami and S. Hasegawa and Hayakawa, {S. H.} and T. Hayakawa and R. Honda and K. Hosomi and Hwang, {S. H.} and N. Ichige and Y. Ichikawa and M. Ikeda and K. Imai and S. Ishimoto and S. Kanatsuki and Kim, {M. H.} and Kim, {S. H.} and S. Kinbara and T. Koike and Lee, {J. Y.} and S. Marcello and K. Miwa and T. Moon and T. Nagae and S. Nagao and Y. Nakada and M. Nakagawa and Y. Ogura and A. Sakaguchi and H. Sako and Y. Sasaki and S. Sato and T. Shiozaki and K. Shirotori and H. Sugimura and S. Suto and S. Suzuki and T. Takahashi and H. Tamura and K. Tanabe and K. Tanida",
note = "Publisher Copyright: {\textcopyright} 2015 American Physical Society.",
year = "2015",
month = nov,
day = "24",
doi = "10.1103/PhysRevLett.115.222501",
language = "English",
volume = "115",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "22",
}