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Esser A, Nagao S, Schulz F, et al. Observation of Λ(4)H Hyperhydrogen by Decay-Pion Spectroscopy in Electron Scattering. Phys Rev Lett. 2015;114(23):232501doi: 10.1103/PhysRevLett.114.232501.
Esser, A., Nagao, S., Schulz, F., Achenbach, P., Ayerbe Gayoso, C., Böhm, R., Borodina, O., Bosnar, D., Bozkurt, V., Debenjak, L., Distler, M. O., Friščić, I., 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. (2015). Observation of Λ(4)H Hyperhydrogen by Decay-Pion Spectroscopy in Electron Scattering. Physical review letters, 114(23), 232501. https://doi.org/10.1103/PhysRevLett.114.232501
Esser, A, et al. "Observation of Λ(4)H Hyperhydrogen by Decay-Pion Spectroscopy in Electron Scattering." Physical review letters vol. 114,23 (2015): 232501. doi: https://doi.org/10.1103/PhysRevLett.114.232501
Esser A, Nagao S, Schulz F, Achenbach P, Ayerbe Gayoso C, Böhm R, Borodina O, Bosnar D, Bozkurt V, Debenjak L, Distler MO, Friščić I, 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 SN, Pochodzalla J, Rappold C, Reinhold J, Saito TR, Sanchez Lorente A, Sánchez Majos S, Schlimme BS, Schoth M, Sfienti C, Širca S, Tang L, Thiel M, Tsukada K, Weber A, Yoshida K. Observation of Λ(4)H Hyperhydrogen by Decay-Pion Spectroscopy in Electron Scattering. Phys Rev Lett. 2015 Jun 12;114(23):232501. doi: 10.1103/PhysRevLett.114.232501. Epub 2015 Jun 09. PMID: 26196794.
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Phys Rev Lett. 2015 Jun 12;114(23):232501. doi: 10.1103/PhysRevLett.114.232501. Epub 2015 Jun 09.

Observation of Λ(4)H Hyperhydrogen by Decay-Pion Spectroscopy in Electron Scattering.

Physical review letters

A Esser, S Nagao, F Schulz, P Achenbach, C Ayerbe Gayoso, R Böhm, O Borodina, D Bosnar, V Bozkurt, L Debenjak, M O Distler, I Friščić, Y Fujii, T Gogami, O Hashimoto, S Hirose, H Kanda, M Kaneta, E Kim, Y Kohl, J Kusaka, A Margaryan, H Merkel, M Mihovilovič, U Müller, S N Nakamura, J Pochodzalla, C Rappold, J Reinhold, T R Saito, A Sanchez Lorente, S Sánchez Majos, B S Schlimme, M Schoth, C Sfienti, S Širca, L Tang, M Thiel, K Tsukada, A Weber, K Yoshida,

Affiliations

  1. Institut für Kernphysik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany.
  2. Department of Physics, Tohoku University, Sendai, 980-8571, Japan.
  3. GSI Helmholtz Centre for Heavy Ion Research, D-64291 Darmstadt, Germany.
  4. Department of Physics, University of Zagreb, HR-10002 Zagreb, Croatia.
  5. Department of Physics, University of Ljubljana, and Jožef Stefan Institute, SI-1000 Ljubljana, Slovenia.
  6. Yerevan Physics Institute, 375036 Yerevan, Armenia.
  7. Helmholtz Institute Mainz, D-55099 Mainz, Germany.
  8. Department of Physics, Florida International University, Miami, Florida 33199, USA.
  9. Department of Physics, Hampton University, Hampton, Virginia 23668, USA.

PMID: 26196794 DOI: 10.1103/PhysRevLett.114.232501

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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