Observation of $_\Lambda ^4$H Hyperhydrogen by Decay-Pion Spectroscopy in Electron Scattering - INSPIRE

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Observation of $_\Lambda ^4$ H Hyperhydrogen by Decay-Pion Spectroscopy in Electron Scattering

A1

Collaboration

•

A. Esser
(
- Mainz U., Inst. Kernphys.
)

Jan 27, 2015

5 pages

Published in:

Phys.Rev.Lett. 114 (2015) 23, 232501

Published: Jun 9, 2015

e-Print:

1501.06823 [nucl-ex]

DOI:

10.1103/PhysRevLett.114.232501

Experiments:

MAINZ-A1

View in:

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Abstract: (APS)

At the Mainz Microtron MAMI, the first high-resolution pion spectroscopy from decays of strange systems was performed by electron scattering off a Be9 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 103 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 HΛ4→He4+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 H3+Λ mass.

21.80.+a
13.75.Ev
21.10.Dr
29.30.Ep
electron nucleus: scattering
beryllium
Lambda: hypernucleus
hypernucleus: decay
pi-: momentum spectrum
ground state: mass

References(28)

Figures(4)

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