O. Borodina

Observation of H Λ 4 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 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.

HYPERNUCLEAR SPECTROSCOPY WITH HEAVY ION BEAMS: THE HypHI PROJECT AT GSI AND FAIR

The HypHI experiment for precise hypernuclear spectroscopy with induced reactions of stable heavy ion beams and rare isotope beams is currently under preparation at GSI. The main goal of the HypHI project is to study neutron and proton rich hypernuclei and to measure directly hypernuclear magnetic moments at GSI and FAIR. In the first HypHI experiment (Phase 0) planned in 2009, the feasibility of precise hypernuclear spectroscopy with heavy ion beams will be demonstrated by observing π- decay channels of , and with 6Li projectiles at 2 A GeV impinging on a 12C target. An overview of the HypHI project and the details of the Phase 0 experiment will be discussed.

Hypernuclear Decay Pion Spectroscopy at Mainz Microtron

Sho NAGAO1∗, Patrick ACHENBACH2, Naoki ARAI1, Carlos Ayerbe GAYOSO2, Ralph BOHM2, Olga BORODINA2,3, Damir BOSNAR4, Vakkas BOZKURT3, Luka DEBENJAK5, Michael O. DISTLER2, Anselm ESSER2, Ivica FRISCIC4, Yuu FUJII1, Toshiyuki GOGAMI1, Mar GOMEZ RODRIGUEZ2, Satoshi HIROSE1, Hiroki KANDA1, Masashi KANETA1, Eunhee KIM3, Junichiro KUSAKA1, Amur MARGARYAN6, Harald MERKEL2, Ulrich MULLER2, Satoshi N. NAKAMURA1, Josef POCHODZALLA2, Christophe RAPPOLD3, Joerg REINHOLD7, Takehiko R. SAITO2,3,8, Alicia Sanchez LORENTE8, Salvador Sanchez MAJOS2, Bjorn Soren SCHLIMME2, Matthias SCHOTH2, Florian SCHULZ2, Concettina SFIENTI2, Simon SIRCA5, Liguang TANG9, Michaela THIEL2, Kyo TSUKADA1, Daisuke UCHIYAMA1 A1 hypernuclear collaboration

Recent Studies of the Strangeness Physics at MAMI-C

Kyo Tsukada1, Patrick Achenbach2, Naoki Arai1, Carlos Ayerbe Gayoso2, Ralph Bohm2, Olga Borodina2,3, Damir Bosnar4, Vakkas Bozkurt3, Luka Debenjak5, Michael O. Distler2, Anselm Esser2, Ivica Friscic3, Yuu Fujii1, Toshiyuki Gogami1, Mar Gomez Rodriguez2, Osamu Hashimoto1, Satoshi Hirose1, Hiroki Kanda1, Masashi Kaneta1, Eunhee Kim3, Junichiro Kusaka1, Kazushige Maeda,1 Amur Margaryan6, Harald Merkel2, Ulrich Muller2, Sho Nagao1, Satoshi N. Nakamura1, Josef Pochodzalla2, Christophe Rappold3,7, Joerg Reinhold8, Takehiko R. Saito2,3,7, Alicia Sanchez Lorente7, Salvador Sanchez Majos2, Bjorn Soren Schlimme2, Matthias Schoth2, Florian Schulz2, Concettina Sfienti2, Simon Sirca5, Liguang Tang9, Michaela Thiel2 A1 hypernuclear collaboration

High precision mass measurements of hypernuclei achievements and perspectives

A. Essera, S. Nagaoe, F. Schulza, P. Achenbacha, C. Ayerbe Gayosoa, R. Bohma, O. Borodinaa,b, D. Bosnarc, A. Botvinag, V. Bozkurtb, L. Debenjakd , M.O. Distlera, I. Friscicc, Y. Fujiie, T. Gogamie, M. Gomez Rodrigueza, O. Hashimotoe∗, S. Hirosee, H. Kandae, M. Kanetae, E. Kimb, Y. Kohla, J. Kusakae, A. Margaryan f , H. Merkela, M. Mihovilovicd , U. Mullera, S.N. Nakamurae, J. Pochodzalla†a,g, C. Rappoldb, J. Reinholdh, T.R. Saitoa,b,g, A. Sanchez Lorenteg, S. Sanchez Majosa, B.S. Schlimmea, M. Schotha, C. Sfientia, S. Sircad , L. Tangi, M. Thiela, K. Tsukadae, A. Webera, K. Yoshidab