Observation of Spin-Dependent Charge Symmetry Breaking in Λ N Interaction: Gamma-Ray Spectroscopy of He Λ 4
Year: 2015
Type: article
Abstract: The energy spacing between the spin-doublet bound state of _{Λ}^{4}He(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 ^{4}He(K^{-},π^{-})_{Λ}^{4}He reaction at J-PARC. In comparison to the corresponding energy spacing in the mirror hypernucleus _{Λ}^{4}H, 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.
Source: Physical Review Letters
Authors: T. O. Yamamoto, M. Agnello, Y. Akazawa, N. Amano, K. Aoki, E. Botta, N. Chiga, H. Ekawa, P. Evtoukhovitch, A. Feliciello, M. Fujita, T. Gogami, S. Hasegawa, S. H. Hayakawa, T. Hayakawa, R. Honda, K. Hosomi, S. H. Hwang, N. Ichige, Y. Ichikawa, M. Ikeda, K. Imai, S. Ishimoto, S. Kanatsuki, M. H. Kim, S. H. Kim, S. Kinbara, T. Koike, J. Y. Lee, S. Marcello, K. Miwa, T. Moon, T. Nagae, S. Nagao, Y. Nakada, M. Nakagawa, Y. Ogura, A. Sakaguchi, H. Sako, Y. Sasaki, S. Sato, T. Shiozaki, K. Shirotori, H. Sugimura, S. Suto, S. Suzuki, T. Takahashi, H. Tamura, K. Tanabe, K. Tanida, Z. Tsamalaidze, M. Ukai, Y. Yamamoto, S. B. Yang
Institutions: Tohoku University, Politecnico di Torino, Istituto Nazionale di Fisica Nucleare, Sezione di Torino, Kyoto University, High Energy Accelerator Research Organization, Institute of Particle and Nuclear Studies, University of Turin, Joint Institute for Nuclear Research, Japan Atomic Energy Agency, Advanced Science Research Center, The University of Osaka, Korea University, Gifu University, Seoul National University, Research Center for Nuclear Physics, The University of Osaka
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Awards: G2525816837, G2854894452, Charge symmetry breaking in Lambda-N interaction investigated via hypernuclear gamma-ray spectroscopy, Ｊ－ＰＡＲＣにおけるΞハイパー核の分光実験, G4467562189, Gamma-Ray Spectroscopy of Strange Baryon Systems, G4626119452, G4944671077, G5347037801, G6411980158, Development of a pi0 spectrometer system for hypernuclear gamma-ray spectroscopy, G7115012554, G7131363810, G8108392651, Development of a waveform readout system for germanium detectors, Study of interaction between nucleus and Xi particle via measurement of Xi atomic X rays., Study of Lambda's g-factor in a nucleus via hypernuclear gamma-ray spectroscopy
OpenAlex ID: W1873242033