(EC+

130Ndand 140Tb were produced by irradiation of 96Ru and 106Cd with 36Ar. The two nuclides were identified and studied by using a He-jet fast tape transport system in combination with X-γ and γ-γ coincidence measurements. The half-life of 130Nd was determined to be 13 ± 3s. The (EC+β +) decay scheme of 130Nd was proposed for the first time, and the spins and parities of the ground state and observed low-lying states in the daughter nucleus 130Pr were tentatively assigned. The previous (EC+β +) decay scheme of 140Tb was revised, and the spin and parity of its ground state were assigned to be 7+

New nuclide 139^{139}Tb and (EC+ β+\beta ^{+}) decay of 138,139^{138,139}Gd

The unknown isotope $^{139}$Tb and the known isotopes $^{138,139}$Gd were produced in the $^{36}$Ar+$^{106}$Cd reaction and studied by using a He-jet tape transport system in combination with X-$\gamma$ and $\gamma$-$\gamma$ coincidence measurements. The half-lives of $^{139}$Tb, $^{139g}$Gd, $^{139m}$Gd and $^{138}$Gd were determined to be 1.6(2), 5.8(9), 4.8(9) and 4.7(9) s, respectively. Partial (EC+$\beta ^{+}$) decay schemes of $^{139g}$Gd, $^{139m}$Gd and $^{138}$Gd were proposed for the first time

(EC+β+\beta^{+}) decay of 130^{130}Pm and 128^{128}Pr

$^{130}$Pm and $^{128}$Pr were produced by irradiation of $^{96}$Ru with $^{36}$Ar, and studied using a He-jet recoil tape transport system. Based on X-$\gamma$ and $\gamma$-$\gamma$ coincidence measurements, the (EC+$\beta ^{+}$) decay scheme of $^{130}$Pm was proposed for the first time and the (EC+$\beta ^{+}$) decay scheme of $^{128}$Pr was revised

Transmission-mode diamond X-ray position sensitive detector and its applications in synchrotron radiation beamlines

National audienceBackground: X-ray position sensitive detector is indispensable for beamlines at synchrotron radiation facilities. Synthetic single-crystal diamond position sensitive detectors have been developed to take advantage of next-generation synchrotron sources, which are trending toward use of high-flux beams and/or beams requiring enhanced stability and precise understanding of beam position and intensity from the front end of the beamline all the way to the sample in recent years. Purpose: It is aimed to provide accurate real-time position and flux for high-flux X-ray beams. Methods: Based on the principle of potentiometers, the transmission-mode diamond X-ray position sensitive detector works as a “solid” ionization chamber. When the X-ray beam comes into the detector’s sensitive region, electronic-holes occur due to the effect of ionization and the charges or the current pulses on the electrodes of the detector are given. According to the collected currents on the electrodes, the location of the incident X-ray can be determined by the ratio between the current difference of electrodes and the total current. Results: A signal/noise ratio of (S/N)>5×10³ and a position resolution of σ=(136±11) nm for the synthetic single-crystal diamond position sensitive detector with an active area of 2.5 mm×2.5 mm, respectively, have been obtained. The measurement precisions for the X-ray beam intensity and position linearity are less than 0.1%. Conclusion: We have demonstrated the feasibility of building a transmission-mode synthetic single-crystal diamond X-ray position sensitive detector, which could measure X-ray beam intensity and position in real time. Its performance was determined on the macromolecular crystallography beamline (BL17U1) at SSRF. Experimental data show that the diamond detector has good linear response and measurement precision of beam intensity within the whole active area

Search for β{\beta}-delayed fission of the heavy neutron-rich isotope 230Ac\mathsf{^{230}Ac}

The $^{230}$Ra has been produced via multinucleon transfer reaction and dissipative fragmentation by 60 MeV/u $^{18}$O ion irradiation of $^{232}$Th targets. The radium was radiochemically separated from the mixture of thorium and reaction products. Thin Ra sources were prepared and exposed to the mica fission track detectors, and measured by a HPGe gamma detector. It is likely that the $\beta$-delayed fission of $^{230}$Ac was observed for the first time and the $\beta$-delayed fission probability of $^{230}$Ac was tentatively found to be (1.19$\pm$0.40)$\times$10$^{-8}$

β\beta-delayed Proton Decay of 89^{89}Ru

A $\beta$-delayed proton activity with a half-life of 1.2 $\pm$ 0.2 s was assigned to $^{89}$Ru on the basis of a p-$\gamma$(X) coincidence measurement in the reaction of $^{58}$Ni ($^{36}$Ar, 2p3n ) using a He-jet tape transport system. The measured delayed-proton spectrum of $^{89}$Ru and relative proton branching ratios to the low-lying states in $^{88}$Mo were compared with statistical model calculations