Phys. Rev. C 64, 044302 (2001) [15 pages]Spectroscopy of medium-heavy Λ hypernuclei via the (π+,K+) reactionReceived 23 April 2001; published 19 September 2001 Excitation energy spectra of Λ89Y, Λ51V, and Λ12C have been measured via the (π+,K+) reaction by using the SKS spectrometer at the K6 beam line in the KEK 12-GeV Proton Synchrotron. In the Λ89Y 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 Λ hypernuclear systems and precisely obtaining a series of Λ single-particle energies in the very wide excitation energy range of more than 20 MeV, for the first time. Also in the Λ51V spectrum, a similar structure to that of Λ89Y was observed. In the Λ12C 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. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.64.044302
DOI:
10.1103/PhysRevC.64.044302
PACS:
21.80.+a, 25.80.Hp
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