Non-depleted sub-continental mantle beneath the Superior Province of the Canadian Shield - Nd-Sr isotopic and trace element evidence from Midcontinent Rift basalts
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Paces, James B.↗
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Anomalous neutron yields confirmed for Ba-Mo and newly observed for Ce-Zr from spontaneous fission of Cf 252
We reinvestigated the neutron multiplicity yields of Ba-Mo, Ce-Zr, Te-Pd, and Nd-Sr from the spontaneous fission of 252 Cf by (i) using both γ -γ -γ -γ and γ -γ -γ coincidence data, (ii) using up to date level scheme structures, and (iii) crosschecking analogous energy transitions in multiple isotopes, we have achieved higher precision than previous analyses. Particular attention was given to the Ba-Mo pairs where our results clearly confirm that the Ba-Mo yield data have a second hot fission mode where 8–10, and now 11 neutron evaporation channels are observed. These are the first observations of the 11 neutron channel. These 8–11 neutron channels are observed for the first time in the Ce-Zr pairs, but are not observed in other fission pairs. The measured intensities of the second mode in Ba-Mo and Ce-Zr pairs are ~1.5(4)% and ~1.0(3)%, respectively. These high neutron number evaporation modes can be an indication of hyperdeformation and/or octupole deformation in 143-145 Ba and in 146,148 Ce at scission to give rise to such high neutron multiplicities.
252-Cf↗
Lithospheric evolution of the Northern Arabian Shield: Chemical and isotopic evidence from basalts, xenoliths and granites
The evolution of the upper-mantle and the lower-crust (the conteinental lithosphere), is the area of Israel and Sinai was studied, using the chemical composition and the Nd-Sr isotopic systematics from mantle and crustal nodules, their host basalts, and granites. The magmatism and the metasomatism making the lithosphere are related to uprise of mantle diapirs in the uppermost mantle of the area. These diapirs heated the base of the lithosphere, eroded, and replaced it with new hot material. It caused a domal uplift of the lithosphere (and the crust). The doming resulted in tensional stresses that in turn might develop transport channels for the basalt.
Stein, M.↗
Materials Data on Sr3Nd by Materials Project
Sr3Nd is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Sr is bonded to eight equivalent Sr and four equivalent Nd atoms to form distorted SrSr8Nd4 cuboctahedra that share corners with four equivalent NdSr12 cuboctahedra, corners with fourteen equivalent SrSr8Nd4 cuboctahedra, edges with six equivalent NdSr12 cuboctahedra, edges with twelve equivalent SrSr8Nd4 cuboctahedra, faces with four equivalent NdSr12 cuboctahedra, and faces with sixteen equivalent SrSr8Nd4 cuboctahedra. There are a spread of Sr–Sr bond distances ranging from 3.97–4.22 Å. There are two shorter (4.01 Å) and two longer (4.10 Å) Sr–Nd bond lengths. Nd is bonded to twelve equivalent Sr atoms to form NdSr12 cuboctahedra that share corners with six equivalent NdSr12 cuboctahedra, corners with twelve equivalent SrSr8Nd4 cuboctahedra, edges with eighteen equivalent SrSr8Nd4 cuboctahedra, faces with eight equivalent NdSr12 cuboctahedra, and faces with twelve equivalent SrSr8Nd4 cuboctahedra.
36 MATERIALS SCIENCE↗
Materials Data on SrNd3 by Materials Project
SrNd3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Sr is bonded to twelve Nd atoms to form SrNd12 cuboctahedra that share corners with six equivalent SrNd12 cuboctahedra, corners with twelve NdSr4Nd8 cuboctahedra, edges with eighteen NdSr4Nd8 cuboctahedra, faces with eight equivalent SrNd12 cuboctahedra, and faces with twelve NdSr4Nd8 cuboctahedra. There are six shorter (3.81 Å) and six longer (3.83 Å) Sr–Nd bond lengths. There are two inequivalent Nd sites. In the first Nd site, Nd is bonded to four equivalent Sr and eight Nd atoms to form distorted NdSr4Nd8 cuboctahedra that share corners with four equivalent SrNd12 cuboctahedra, corners with fourteen equivalent NdSr4Nd8 cuboctahedra, edges with six equivalent SrNd12 cuboctahedra, edges with twelve NdSr4Nd8 cuboctahedra, faces with four equivalent SrNd12 cuboctahedra, and faces with sixteen NdSr4Nd8 cuboctahedra. There are a spread of Nd–Nd bond distances ranging from 3.68–3.99 Å. In the second Nd site, Nd is bonded to four equivalent Sr and eight equivalent Nd atoms to form distorted NdSr4Nd8 cuboctahedra that share corners with four equivalent SrNd12 cuboctahedra, corners with fourteen NdSr4Nd8 cuboctahedra, edges with six equivalent SrNd12 cuboctahedra, edges with twelve equivalent NdSr4Nd8 cuboctahedra, faces with four equivalent SrNd12 cuboctahedra, and faces with sixteen NdSr4Nd8 cuboctahedra.
36 MATERIALS SCIENCE↗