[en] Full text: Extremely overdense spherical tokamak plasmas are produced noninductively with electron Bernstein waves mode-converted via O-X-B scheme. When the fundamental electron cyclotron resonance (ECR) layer is located at the plasma core and the 2nd harmonic ECR layer is near the outboard vessel wall and the upper hybrid resonance layer is located between them, significant density rise is obtained with a strong gas puffing preventing hot spots and without intermittent plasma ejection phenomenon. (author)

[en] A new (e,e'K⁺) hypernuclear spectroscopy is proposed at Jefferson Lab. With a newly designed high resolution kaon spectrometer (HKS) and a new experimental configuration to reduce background electrons associated with bremsstrahlung, it is expected to realize much higher yield and hypernuclear mass resolution than those of the first successful experiment at Jefferson Lab Hall-C, which demonstrated the feasibility of hypernuclear electroproduction for Λ hypernuclear spectroscopy

[en] The binding energy of ⁷_ΛHe has been obtained for the first time with reaction spectroscopy using the (e, e'K⁺) reaction at Jefferson Lab's Hall C. A comparison among the binding energies of the A = 7 T = l iso-triplet hypernuclei, ⁷_ΛHe, ⁷_ΛLi*and ⁷_ΛBe, is made and possible charge symmetry breaking (CSB) in the ΛN potential is discussed. For ⁷_ΛHe and ⁷_ΛBe, the shifts in binding energies are opposite to those predicted by a recent cluster model calculation, which assumes that the unexplained part of the binding energy difference between ⁴_ΛH and ⁴_ΛHe, is due to the CSB of the ΛN potential. Further examination of CSB in light hypernuclear systems is required both experimentally and theoretically.

[en] We have measured the high-field magnetization of NpRhGa₅ with the tetragonal structure and found the sharp metamagnetic transition with a sharp step at 26T in the field along the [100] direction at 4.2K. The magnetization saturates above 38T, with 0.43μ_B/Np. The H-T phase diagram was determined by the magnetization curves at various temperatures

[en] Encouraged by the success of the first hypernuclear spectroscopy through the (e,e'K+) reaction (JLab E89-009), a new improved experiment with a newly developed High resolution Kaon Spectrometer (HKS) and a new configuration of the electron spectrometer is planned at the JLab Hall C. The introduction of the HKS will improve by a factor of two, the energy resolution which was limited by the previous kaon spectrometer. The hypernuclear yield and the signal to noise ratio will be also improved by a factor of 50 and 10, respectively

[en] The HKS (Jlab E01-011) experiment on spectroscopy of Lambda-hypernuclei using (e,e'K+) reaction was successfully carried out in 2005. This paper gives a brief description of the experiment and its technique and shows some of the preliminary spectra that are still under analysis.

[en] The HKS (Jlab E01-011) experiment on spectroscopy of Λ-hypernuclei using (e,e'K⁺) reaction was successfully carried out in 2005. This paper gives a brief description of the experiment and its technique and shows some of the preliminary spectra that are still under analysis