High-resolution hypernuclear spectroscopy at Jefferson Lab, Hall A
Abstract
The experiment E94-107 in Hall A at Jefferson Lab started a systematic study of high resolution hypernuclear spectroscopy in the 0p-shell region of nuclei such as the hypernuclei produced in electroproduction on 9Be, 12C and 16O targets. In order to increase counting rates and provide unambiguous kaon identification two superconducting septum magnets and a ring-imaging Cherenkov detector were added to the Hall A standard equipment. The high-quality beam, the good spectrometers and the new experimental devices allowed us to obtain very good results. For the first time, measurable strength with sub-MeV energy resolution was observed for the core-excited states of Lambda 12B. A high-quality Lambda 16N hypernuclear spectrum was likewise obtained. A first measurement of the Lambda binding energy for Lambda 16N, calibrated against the elementary reaction on hydrogen, was obtained with high precision, 13.76 +/- 0.16 MeV. Similarly, the first Lambda 9Li hypernuclear spectrum shows general agreement with theory (distorted-wave impulse approximation with the SLA and BS3 electroproduction models and shell-model wave functions). Some disagreement exists with respect to the relative strength of the states making up the first multiplet. A Lambda separation energy of 8.36 MeV was obtained, in agreement with previous results. It has been shown that the electroproduction of hypernuclei can provide information complementary to that obtained with hadronic probes and the gamma-ray spectroscopy technique.
Cite
@article{arxiv.1807.09720,
title = {High-resolution hypernuclear spectroscopy at Jefferson Lab, Hall A},
author = {Jefferson Lab Hall A Collaboration and F. Garibaldi and A. Acha and P. Ambrozewicz and K. A. Aniol and P. Beturin and H. Benaoum and J. Benesch and P. Y. Bertin and K. I. Blomqvist and W. U. Boeglin and H. Breuer and P. Brindza and P. Bydzovsky and A. Camsonne and C. C. Chang and J. -P. Chen and Seonho Choi and E. A. Chudakov and E. Cisbani and S. Colilli and L. Coman and F. Cusanno and B. J. Craver and G. De Cataldo and C. W. de Jager and R. De Leo and A. P. Deur and C. Ferdi and R. J. Feuerbach and E. Folts and S. Frullani and O. Gayou and F. Giuliani and J. Gomez and M. Gricia and J. O. Hansen and D. Hayes and D. W. Higinbotham and T. K. Holmstrom and C. E. Hyde and H. F. Ibrahim and M. Iodice and X. Jiang and L. J. Kaufman and K. Kino and B. Kross and L. Lagamba and J. J. LeRose and R. A. Lindgren and M. Lucentini and D. J. Margaziotis and P. Markowitz and S. Marrone and D. G. Meekins and Z. E. Meziani and K. McCormick and R. W. Michaels and D. J. Millener and T. Miyoshi and B. Moffit and P. A. Monaghan and M. Moteabbed and C. Munoz Camacho and S. Nanda and E. Nappi and V. V. Nelyubin and B. E. Norum and Y. Okasyasu and K. D. Paschke and C. F. Perdrisat and E. Piasetzky and V. A. Punjabi and Y. Qiang and B. Raue and P. E. Reimer and J. Reinhold and B. Reitz and R. E. Roche and V. M. Rodriguez and A. Saha and F. Santavenere and A. J. Sarty and J. Segal and A. Shahinyan and J. Singh and S. Sirca and R. Snyder and P. H. Solvignon and M. Sotona and R. Subedi and V. A. Sulkosky and T. Suzuki and H. Ueno and P. E. Ulmer and G. M. Urciuoli and E. Voutier and B. B. Wojtsekhowski and X. Zheng and C. Zorn},
journal= {arXiv preprint arXiv:1807.09720},
year = {2019}
}
Comments
27 pages, 18 figures, submitted to Physical Review C