Spectroscopy of medium-heavy Λ hypernuclei via the(π+,K+)reaction

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Abstract

Excitation energy spectra of ${}_{\mathrm{\ensuremath{\Lambda}}}^{89}\mathrm{Y},$ ${}_{\mathrm{\ensuremath{\Lambda}}}^{51}\mathrm{V},$ and ${}_{\mathrm{\ensuremath{\Lambda}}}^{12}\mathrm{C}$ have been measured via the $({\ensuremath{\pi}}^{+}{,K}^{+})$ reaction by using the SKS spectrometer at the K6 beam line in the KEK 12-GeV Proton Synchrotron. In the ${}_{\mathrm{\ensuremath{\Lambda}}}^{89}\mathrm{Y}$ spectrum, obtained with an energy resolution of 1.65 MeV (FWHM) and in the highest statistics so far, we have succeeded in clearly observing a characteristic fine structure in heavy \ensuremath{\Lambda} hypernuclear systems and precisely obtaining a series of \ensuremath{\Lambda} single-particle energies in the very wide excitation energy range of more than 20 MeV, for the first time. Also in the ${}_{\mathrm{\ensuremath{\Lambda}}}^{51}\mathrm{V}$ spectrum, a similar structure to that of ${}_{\mathrm{\ensuremath{\Lambda}}}^{89}\mathrm{Y}$ was observed. In the ${}_{\mathrm{\ensuremath{\Lambda}}}^{12}\mathrm{C}$ spectrum, new core-excited states were clearly resolved thanks to the best energy resolution of 1.45 MeV so far achieved by using the SKS spectrometer.

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