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Observation of hyperhydrogen by decay-pion spectroscopy of electro-produced hypernuclei

Date:
July 3, 2015
Source:
Tohoku University
Summary:
An international team has been developing a new experimental technique - the decay-pion spectroscopy of electro-produced hypernuclei since 2011. They have now used this new technique to successfully measure atomic mass.
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A photo of A1 experimental hall of MAMI, Mainz University. Two large magnetic spectrometers (red and green) measure pions from decay of hypernuclei and another spectrometer (purple) tags kaons to select the events from hypernuclei.
Credit: Copyright Tohuku University

An international collaboration led by Prof. S.N. Nakamura (Graduate School of Science, Tohoku University), Prof. J. Pochodzalla, Dr. P. Achenbach (Mainz University) and Prof. L. Tang (Hampton University) has been developing a new experimental technique -- the decay-pion spectroscopy of electro-produced hypernuclei since 2011. This technique observes pions from two-body weak-decay of hypernuclei to measure precise masses of hypernuclei.

In a world first, the international collaboration used this new technique to successfully measure the mass of [4ΛH], which consists of one proton, two neutrons and one Λ particle.

The best resolution, 540 keV(FWHM), of the mass measurement of hypernuclei was achieved at the Jefferson Lab (USA) for [12ΛB] using the (e,e'K+) reaction by the international collaboration led by Profs. Nakamura and Tang.

However the achieved resolution by this new method is 150 keV(FWHM) which is more than three times better than the previous world record.

This new measurement will contribute greatly to solving the puzzle of the Charge Symmetry Breaking of the Λ-N interaction.

Young researchers supported by the Japan Society for the Promotion of Science (JSPS) -- the Strategic Young Researchers Overseas Visit Program for Accelerating Brain Circulation (R2201) and Core-to-Core program (21002) -- played essential roles in the success of this project.


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Materials provided by Tohoku University. Note: Content may be edited for style and length.


Journal Reference:

  1. 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. Observation ofHΛ4Hyperhydrogen by Decay-Pion Spectroscopy in Electron Scattering. Physical Review Letters, 2015; 114 (23) DOI: 10.1103/PhysRevLett.114.232501

Cite This Page:

Tohoku University. "Observation of hyperhydrogen by decay-pion spectroscopy of electro-produced hypernuclei." ScienceDaily. ScienceDaily, 3 July 2015. <www.sciencedaily.com/releases/2015/07/150703125932.htm>.
Tohoku University. (2015, July 3). Observation of hyperhydrogen by decay-pion spectroscopy of electro-produced hypernuclei. ScienceDaily. Retrieved May 24, 2017 from www.sciencedaily.com/releases/2015/07/150703125932.htm
Tohoku University. "Observation of hyperhydrogen by decay-pion spectroscopy of electro-produced hypernuclei." ScienceDaily. www.sciencedaily.com/releases/2015/07/150703125932.htm (accessed May 24, 2017).

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