The polarization observables are sensitive to the two nucleón (2NF) and three-nucleon structures (3NF) of the nuclei. The aim of the deuteron spin structure (DSS) experiment is to obtain polarization ...observables in dp elastic scattering at large CMS angles (> 60°) and in dp breakup. Of great importance is the study of polarizations observables in these reactions at intermediate energies because the experimental and theoretical data are very scarce. In this review, results of vector and tensor analyzing powers obtained at JINR Nuclotron at 800 MeV will be presented.
•The heavy-ion storage ring project, the Rare-RI Ring, is ongoing at the RIKEN RI Beam Factory.•The Rare-RI Ring will enable precision isochronous mass spectrometry of r-process nuclei.•A resonant ...Schottky pick-up will be used for the precise tuning of isochronous optics of the storage ring.•Simulation results of 3D electromagnetic field calculations show a high sensitivity of stored single-ion detection.
The new heavy-ion storage ring project Rare-RI Ring at the RIKEN RI Beam Factory launched in 2012 aims at precision isochronous mass spectrometry for single ions of exotic nuclides. To precisely tune the storage-ring ion optical conditions to the isochronous field setting, Schottky noise pick-up technique will be employed. Pillbox-type resonant cavity, similar to the Schottky pick-up system successfully operating at the experimental storage ring ESR at GSI, is adopted for the pick-up probe. To determine the design values of the cavity, we systematically performed a simulation study of three-dimensional electromagnetic field calculations in the high frequency region. High shunt impedance obtained in the simulation will enable us to detect stored single ions with charge down to q≃15.
We have combined the low-energy neutron detector WINDS (Wide-angle Inverse-kinematics Neutron Detectors for SHARAQ) and the SAMURAI spectrometer at RIKEN Nishina Center RI Beam Factory (RIBF) in ...order to perform (p,n) reactions in inverse kinematics for unstable nuclei in the mass region around A∼100. In this setup, WINDS is used for detecting recoil neutrons and the SAMURAI spectrometer is used for tagging decay channel of heavy residue. The first experiment by using the setup was performed to study Gamow–Teller transitions from 132Sn in April 2014. The atomic number Z and mass-to-charge ratio A/Q of the beam residues were determined from the measurements of time of flight, magnetic rigidity and energy loss. The obtained A/Q and Z resolutions were σA/Q=0.14% and σZ=0.22, respectively. Furthermore, owing to the large momentum acceptance (50%) of SAMURAI, the beam residues associated with the γ, 1n and 2n decay channel were measured in the same magnetic field setting. The kinematic loci of the measured recoil neutron energy and laboratory angle are clearly seen. It shows that the excitation energy up to about 20MeV can be reconstructed.
Preliminary results on the angular distributions of the vector
A
y
and tensor
A
yy
, A
xx
analyzing powers in dp elastic scattering at the energy of 800 MeV are presented. The measurements have been ...performed on Internal Target Station of the JINR Nuclotron using polarized deuteron beam from new source of polarized ions. The experimental data are compared with the preliminary calculations obtained within framework of relativistic multiple scattering approach.
Short-lived 46Cr, 50Fe and 54Ni were studied by isochronous mass spectrometry at the HIRFL-CSR facility in Lanzhou. The measured precision mass excesses (ME) of 46Cr, 50Fe and 54Ni are ...−29471(11) keV, −34477(6) keV and −39278(4) keV, respectively. The superallowed 0+→0+β-decay Q values were derived to be QEC(Cr46)=7604(11) keV, QEC(Fe50)=8150(6) keV and QEC(Ni54)=8731(4) keV. The values for 50Fe and 54Ni are by one order of magnitude more precise than the adopted literature values. By combining the existing half-lives and branching ratios, we obtained the corrected Ft values to be Ft(Fe50)=3103(70) s and Ft(Ni54)=3076(50) s. The main contribution to the Ft uncertainties is now due to β-decay branching ratios, still, more high-precision measurements of the half-lives, the masses, and especially the branching ratios are needed in order to satisfy the requirements for a stringent CVC test.
Polybutylene succinate (Bionolle) and cellulose triacetate (CTA) were solvent-cast blended with chloroform. Homogeneous blend films were obtained over a wide range of composition. The structure and ...properties of the blend films were investigated using various apparatuses. From Fourier transform infrared spectroscopy, wide-angle X-ray, and thermal measurements, it was found that the miscibility of Bionolle (BN) with CTA is excellent. In other words, in CTA-rich samples, it was found that BN molecules in the CTA matrix do not form a crystalline state, but forms an amorphous state. Therefore, the mechanical properties of the CTA-rich samples do not indicate the singularity before and after the melting point of pure BN. When CTA-rich samples were heated above the glass transition temperature of CTA, the BN molecules were eluted from the CTA matrix.
Three precise measurements for elastic pd scattering at 135 MeV/A have been performed with the three different experimental setups. The cross sections are described well by the theoretical ...predictions based on modern nucleon-nucleon forces combined with three-nucleon forces. Relativistic Faddeev calculations show that relativistic effects are restricted to backward angles. This result supports the two measurements recently reported by RIKEN and contradicts the KVI data.
Dp
breakup reaction is investigated in the energy range 300-500 MeV at the Internal Target of the Nuclotron using unpolarized and polarized beams by DSS collaboration. The goal of the study is to ...obtain information about nucleon-nucleon correlations at short distances, non-nucleonic degrees of freedom and relativistic effects. A part of the breakup data at 300 MeV and 400 MeV has been obtained in kinematics where relativistic effects would have a significant contribution.
BigRIPS as a high resolution spectrometer for pionic atoms Nishi, T.; Berg, G.P.A.; Dozono, M. ...
Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms,
12/2013, Letnik:
317
Journal Article
Recenzirano
We are presently working on a new project ‘pionic atom factory project’ at RIBF. The project aims at precision spectroscopy of the energy spectrum of the pionic atom for a wide range of elements, ...using missing-mass spectroscopy of the (d,3He) reaction near the π- emission threshold. For this project, we developed a new ion optics for BigRIPS using the dispersion-matching method. In this optics the BigRIPS beam line is used as a high resolving-power forward angle spectrometer to momentum-analyze 3He. We are aiming for a spectral resolution of <400keV (FWHM). An overview of the new optics and the result of a pilot experiment are reported.
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