6533b821fe1ef96bd127b5df

RESEARCH PRODUCT

Ground-state binding energy of HΛ4 from high-resolution decay-pion spectroscopy

Y. TakahashiConcettina SfientiM. O. DistlerMasashi KanetaJ. BeričičS. BleserHarald MerkelU. MüllerSimon ŠIrcaM. MihovilovicPatrick AchenbachM. SteinenR. BöhmL. G. TangW. KusakaIvica FriščićS. AulenbacherYu FujiiDamir BosnarMichaela ThielS. KegelJ. PochodzallaAnselm EsserA. Sanchez LorenteY. KohlH. FonvieilleA. WeberA. TyukinM. SchothHiroki KandaF. SchulzKyo TsukadaToshiyuki GogamiL. CorreaB. S. SchlimmeSho NagaoAmur MargaryanSatoshi NakamuraManami Fujita

subject

PhysicsNuclear and High Energy PhysicsSpectrometer010308 nuclear & particles physicsBinding energy01 natural sciencesNuclear physicsPion0103 physical sciencesSymmetry breaking010306 general physicsSpectroscopyGround stateMicrotronOrder of magnitude

description

Abstract A systematic study on the Λ ground state binding energy of hyperhydrogen H Λ 4 measured at the Mainz Microtron MAMI is presented. The energy was deduced from the spectroscopy of mono-energetic pions from the two-body decays of hyperfragments, which were produced and stopped in a 9Be target. First data, taken in the year 2012 with a high resolution magnetic spectrometer, demonstrated an almost one order of magnitude higher precision than emulsion data, while being limited by systematic uncertainties. In 2014 an extended measurement campaign was performed with improved control over systematic effects, increasing the yield of hypernuclei and confirming the observation with two independent spectrometers and two targets of different thicknesses. The analysis of these data is in agreement with the previously published value for the H Λ 4 binding energy as well as with a consistent re-analysis of the 2012 data. When compared to the He Λ 4 binding energy from emulsion data, a large charge symmetry breaking effect in the A = 4 hypernuclear system is confirmed.

yearjournalcountryeditionlanguage
2016-10-01Nuclear Physics A
https://doi.org/10.1016/j.nuclphysa.2016.03.015