Observation of (_Λ^4)H Hyperhydrogen by Decay-Pion Spectroscopy in Electron Scattering (CROSBI ID 219100)
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Podaci o odgovornosti
Esser, A. ; Nagao, S. ; Schulz, F. ; Achenbach, P. ; Ayerbe Gayoso, C. ; Böhm, R. ; Borodina, O. ; Bosnar, Damir ; Bozkurt, V. ; Debenjak, L. ; Distler, M. O. ; Friščić, Ivica ; Fujii, Y. ; Gogami, T. ; Hashimoto, O. ; Hirose, S. ; Kanda, H. ; Kaneta, M. ; Kim, E. ; Kohl, Y. ; Kusaka, J. ; Margaryan, A. ; Merkel, H. ; Mihovilovič, M. ; Müller, U. ; Nakamura, S. N. ; Pochodzalla, J. ; Rappold, C. ; Reinhold, J. ; Saito, T. R. ; Sanchez Lorente, A. ; Sánchez Majos, S. ; Schlimme, B. S. ; Schoth, M. ; Sfienti, C. ; Širca, S. ; Tang, L. ; Thiel, M. ; Tsukada, K. ; Weber, A. ; Yoshida, K.
engleski
Observation of (_Λ^4)H Hyperhydrogen by Decay-Pion Spectroscopy in Electron Scattering
At the Mainz Microtron MAMI, the first high-resolution pion spectroscopy from decays of strange systems was performed by electron scattering off a (^9)Be target in order to study the Λ binding energy of light hypernuclei. Positively charged kaons were detected by a short-orbit spectrometer with a broad momentum acceptance at 0° forward angles with respect to the beam, efficiently tagging the production of strangeness in the target nucleus. Coincidentally, negatively charged decay pions were detected by two independent high-resolution spectrometers. About 10^3 pionic weak decays of hyperfragments and hyperons were observed. The pion momentum distribution shows a monochromatic peak at p_π ≈ 133 MeV/c, corresponding to the unique signature for the two-body decay of hyperhydrogen (_Λ^4)H→(^4)H+π^-, stopped inside the target. Its Λ binding energy was determined to be B_Λ = 2.12 ± 0.01 (stat) ± 0.09 (syst) MeV with respect to the (^3)H + Λ mass.
Electron Scattering; Hypernuclei; MAMI; KAOS; Decay-Pion Spectroscopy
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Podaci o izdanju
114
2015.
232501-1-232501-5
objavljeno
0031-9007
10.1103/PhysRevLett.114.232501