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.

arXiv comment27 pages, 18 figures, submitted to Physical Review C

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• The gamma + p to K+ + Lambda and gamma + p to K+ + Sigma0 reactions at forward angles with photon energies from 1.5 to 2.4 GeV
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• High Resolution Spectroscopy of 12B_Lambda by Electroproduction
• High Resolution Spectroscopy of 16N_Lambda by Electroproduction
• Shell-model calculations for p-shell hypernuclei
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• Hypernuclear Spectroscopy using the (e,e'K+) Reaction
• Photoproduction of $K\Lambda$ on the proton
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• Exclusive electroproduction of K+ Lambda and K+ Sigma^0 final states at Q^2 = 0.030-0.055 (GeV/c)^2
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Cited by in corpus (13)

• Jacobi no-core shell model for $p$-shell hypernuclei
• Towards the understanding of the genuine three-body interaction for p$-$p$-$p and p$-$p$-\Lambda$
• Measurement of the 3He Spin-Structure Functions and of Neutron (3He) Spin-Dependent Sum Rules at 0.035<Q^2<0.24 GeV^2
• High-resolution hypernuclear spectroscopy at Jefferson Lab, Hall A
• $K^{+}\Lambda$ photoproduction at forward angles and low momentum transfer
• Constraints from $\Lambda$ hypernuclei on the $\Lambda NN$ content of the $\Lambda$-nucleus potential
• $\Lambda$ hypernuclear potentials beyond linear density dependence
• Measurement of the generalized spin polarizabilities of the neutron in the low $Q^2$ region
• Exploring the ${\Sigma }^{+}p$ interaction by measurements of the correlation function
• The cross-section measurement for the ${}^3\text{H}(e,e^{\prime }{K}^{+})nn\Lambda$ reaction
• Spectroscopy of $A=9$ hyperlithium by the $(e,e^{\prime }{K}^{+})$ reaction
• Photoproduction of $K^{+}\Lambda$ with a Regge-plus-resonance model
• Fermi motion effects in electroproduction of hypernuclei