The National Ignition Facility (NIF) i,ii at Lawrence Livermore National Laboratory is a 192 beam, 1.8 MJ 0.35 µm laser designed to drive inertial confinement fusion (ICF) capsules to ignition iii. NIF was formally dedicated in May 2009. The National Ignition Campaign, a collaborative research undertaking by LLNL, LLE, LANL, GA, and SNL, has a goal of achieving a robust burning plasma by the end of 2012. In the indirect-drive approach iv , the laser energy is converted to thermal x-rays inside a high Z cavity (hohlraum). The x rays then ablate the outer layers of a DT-filled capsule placed at the center of the hohlraum, causing the capsule to implode, compress and heat the DT and ignite.
We report the first measurement of the [Formula: see text] reaction in a polar-direct-drive exploding pusher (PDXP) at the National Ignition Facility (NIF). This work is motivated by the need to develop alternative mix diagnostics, radiochemistry being the focus here. The target is composed of a 65/35 at. % deuterium–tritium (DT) fill surrounded by a roughly [Formula: see text] thick beryllium ablator. The inner portion of the beryllium ablator is doped with 10 at. % of 10B. Radiation-hydrodynamics calculations were performed in 1D to optimize both the remaining boron rho-R and the DT neutron yield. A charged-particle transport post-processor has been developed to study α-induced reactions on the ablator material. Results indicate a large 13N production from α-induced reactions on 10B, measurable by the radiochemical analysis of a gaseous samples system at the NIF. The PDXP target N201115-001 was successfully fielded on the NIF, and nitrogen from the [Formula: see text] reaction was measured. The 13N production yield, as well as the DT neutron yield, was, however, lower than expected. Some of the reduced yields can be explained by the oblate shape, but the ratios of the various radiochemical signals are not commensurate with expectations based on a simple reduction of the 1D results. Preliminary 2D radiation-hydrodynamics computations are consistent with the experimental measurements, and work is ongoing to extend the radiochemistry analysis into higher dimensions.
Three, PO
4
3–
/HPO
4
2–
and AsO
4
3–
-incorporated, new tetranuclear
complexes of copper(II) and zinc(II) ions have been synthesized and
fully characterized. In methanol–water, reactions of H
3
cpdp (H
3
cpdp =
N
,
N
′-Bis[2-carboxybenzomethyl]-
N
,
N
′-Bis[2-pyridylmethyl]-1,3-diaminopropan-2-ol) with copper(II)
chloride in the presence of either NaOH/Na
2
HPO
4
·2H
2
O or KOH/Na
2
HAsO
4
·7H
2
O lead to the isolation of the tetranuclear complexes Na
3
[Cu
4
(cpdp)
2
(μ
4
-PO
4
)](OH)
2
·14H
2
O (
1
)
and K
2
[Cu
4
(cpdp)
2
(μ
4
-AsO
4
)](OH)·16
2
/
3
H
2
O (
2
), respectively. Similarly, the reaction of H
3
cpdp with zinc(II) chloride in the presence of NaOH/Na
2
HPO
4
·2H
2
O yields a tetranuclear
complex, Na(H
3
O)
2
[Zn
4
(cpdp)
2
(μ
4
-HPO
4
)]Cl
3
·12
1
/
2
H
2
O (
3
). All complexes
are characterized by single-crystal X-ray diffraction and other analytical
techniques, such as Fourier transform infrared and UV−vis spectroscopy,
thermogravimetric and electrochemical studies. The solid-state molecular
framework of each complex contains two monocationic [M
2
(cpdp)]
+
(M = Cu, Zn) units, which are exclusively coordinated
to either phosphate/hydrogen phosphate or arsenate groups in a unique
mode. All three complexes exhibit a μ
4
:η
1
:η
1
:η
1
:η
1
bridging mode of the PO
4
3–
/HPO
4
2–
/AsO
4
3–
groups,
with each bridging among four metal ions. The thermal properties of
all three complexes have been investigated by thermogravimetric analysis.
Low-temperature magnetic studies of complexes
1
and
2
disclose moderate antiferromagnetic interactions mediated
among the copper centers through alkoxi...
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