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Observation of Λ(4)H Hyperhydrogen by Decay-Pion Spectroscopy in Electron Scattering.
Esser, A; Nagao, S; Schulz, F; Achenbach, P; Ayerbe Gayoso, C; Böhm, R; Borodina, O; Bosnar, D; Bozkurt, V; Debenjak, L; Distler, M O; Friscic, I; Fujii, Y; Gogami, T; Hashimoto, O; Hirose, S; Kanda, H; Kaneta, M; Kim, E; Kohl, Y; Kusaka, J; Margaryan, A; Merkel, H; Mihovilovic, 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; Sirca, S; Tang, L; Thiel, M; Tsukada, K; Weber, A; Yoshida, K.
Afiliación
  • Esser A; Institut für Kernphysik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany.
  • Nagao S; Department of Physics, Tohoku University, Sendai, 980-8571, Japan.
  • Schulz F; Institut für Kernphysik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany.
  • Achenbach P; Institut für Kernphysik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany.
  • Ayerbe Gayoso C; Institut für Kernphysik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany.
  • Böhm R; Institut für Kernphysik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany.
  • Borodina O; Institut für Kernphysik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany.
  • Bosnar D; GSI Helmholtz Centre for Heavy Ion Research, D-64291 Darmstadt, Germany.
  • Bozkurt V; Department of Physics, University of Zagreb, HR-10002 Zagreb, Croatia.
  • Debenjak L; GSI Helmholtz Centre for Heavy Ion Research, D-64291 Darmstadt, Germany.
  • Distler MO; Department of Physics, University of Ljubljana, and Jozef Stefan Institute, SI-1000 Ljubljana, Slovenia.
  • Friscic I; Institut für Kernphysik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany.
  • Fujii Y; Department of Physics, University of Zagreb, HR-10002 Zagreb, Croatia.
  • Gogami T; Department of Physics, Tohoku University, Sendai, 980-8571, Japan.
  • Hashimoto O; Department of Physics, Tohoku University, Sendai, 980-8571, Japan.
  • Hirose S; Department of Physics, Tohoku University, Sendai, 980-8571, Japan.
  • Kanda H; Department of Physics, Tohoku University, Sendai, 980-8571, Japan.
  • Kaneta M; Department of Physics, Tohoku University, Sendai, 980-8571, Japan.
  • Kim E; Department of Physics, Tohoku University, Sendai, 980-8571, Japan.
  • Kohl Y; GSI Helmholtz Centre for Heavy Ion Research, D-64291 Darmstadt, Germany.
  • Kusaka J; Institut für Kernphysik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany.
  • Margaryan A; Department of Physics, Tohoku University, Sendai, 980-8571, Japan.
  • Merkel H; Yerevan Physics Institute, 375036 Yerevan, Armenia.
  • Mihovilovic M; Institut für Kernphysik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany.
  • Müller U; Institut für Kernphysik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany.
  • Nakamura SN; Institut für Kernphysik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany.
  • Pochodzalla J; Department of Physics, Tohoku University, Sendai, 980-8571, Japan.
  • Rappold C; Institut für Kernphysik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany.
  • Reinhold J; GSI Helmholtz Centre for Heavy Ion Research, D-64291 Darmstadt, Germany.
  • Saito TR; Helmholtz Institute Mainz, D-55099 Mainz, Germany.
  • Sanchez Lorente A; Department of Physics, Florida International University, Miami, Florida 33199, USA.
  • Sánchez Majos S; Institut für Kernphysik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany.
  • Schlimme BS; GSI Helmholtz Centre for Heavy Ion Research, D-64291 Darmstadt, Germany.
  • Schoth M; Helmholtz Institute Mainz, D-55099 Mainz, Germany.
  • Sfienti C; Helmholtz Institute Mainz, D-55099 Mainz, Germany.
  • Sirca S; Institut für Kernphysik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany.
  • Tang L; Institut für Kernphysik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany.
  • Thiel M; Institut für Kernphysik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany.
  • Tsukada K; Institut für Kernphysik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany.
  • Weber A; Department of Physics, University of Ljubljana, and Jozef Stefan Institute, SI-1000 Ljubljana, Slovenia.
  • Yoshida K; Department of Physics, Hampton University, Hampton, Virginia 23668, USA.
Phys Rev Lett ; 114(23): 232501, 2015 Jun 12.
Article en En | MEDLINE | ID: mdl-26196794
ABSTRACT
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 pπ≈133 MeV/c, corresponding to the unique signature for the two-body decay of hyperhydrogen Λ(4)H→(4)He+π(-), stopped inside the target. Its Λ binding energy was determined to be BΛ=2.12±0.01 (stat)±0.09 (syst)MeV with respect to the (3)H+Λ mass.
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Colección: 01-internacional Banco de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2015 Tipo del documento: Article País de afiliación: Alemania
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Colección: 01-internacional Banco de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2015 Tipo del documento: Article País de afiliación: Alemania