Results 11 to 20 of about 3,012,109 (369)

Ab initio coupled-cluster effective interactions for the shell model: application to neutron-rich oxygen and carbon isotopes. [PDF]

Physical Review Letters, 2014
We derive and compute effective valence-space shell-model interactions from ab initio coupled-cluster theory and apply them to open-shell and neutron-rich oxygen and carbon isotopes.
G. Jansen, J. Engel, G. Hagen, Petr Navrátil, A. Signoracci   +4 more
semanticscholar   +5 more sources

Carbon Isotopes Near Drip Lines in the Relativistic Mean-Field Theory [PDF]

, 1998
We have investigated the ground-state properties of carbon isotopes in the framework of the relativistic mean-field (RMF) theory. RMF calculations have been performed with the non-linear scalar self-coupling of the $\sigma$ meson using an axially ...
A. Mueller, A. R. Bodmer, A. R. Farhan, B. D. Serot, B. D. Serot, B. D. Serot, E. Liatard, E. Roeckel, G. A. Lalazissis, G. A. Lalazissis, G. A. Lalazissis, G. Audi, H. de Vries, I. Tanihata, I. Tanihata, I. Tanihata, J. Boguta, J. Specht, J. Vervier, M. M. Sharma, M. M. Sharma, M. M. Sharma, M. M. Sharma, M. Yasue, M. Zhukov, P. G. Reinhard, P. J. Simmonds, P. Möller, P. Ring, R. J. Furnstahl, S. Mythili, W. Pöschl, Y. Horikawa, Y. K. Gambhir, Y. Sugahara, Z. Ren   +35 more
core   +5 more sources

The Emergence of Carbon Isotope Exchange

Angewandte Chemie International Edition, 2019
Significant progress in C-C bond activation with transition metals has recently enabled the development of several carbon isotope exchange reactions. These methods are based on C-C bond decarboxylative carboxylation reactions in the presence of selected transition metals and labelled carbon monoxide or carbon dioxide.
Hinsinger, Karen, Pieters, Gregory
openaire   +4 more sources

Carbon Isotopic Chemistry [PDF]

Symposium - International Astronomical Union, 1992
Isotopic molecular abundances are used to interpret Galactic chemical evolution and the properties of interstellar clouds. The isotopic chemistry of carbon plays an important role in the interpretation of these measurements. This paper reviews the recent measurements of the carbon twelve to thirteen ratio across the Galaxy and the isotopic chemistry.
openaire   +2 more sources

Stable isotope values in modern bryozoan carbonate from New Zealand and implications for paleoenvironmental interpretation [PDF]

, 2004
Bryozoan carbonate contains useful geochemical evidence of temperate shelf paleoenvironments. Stable isotope values were determined for 103 modern marine bryozoan skeletons representing 30 species from New Zealand. δ18O values range from -1.4 to 2.8 VPDB,
Anderson T. F., Boardman R. S., Bone Y., Corfield R. M., Forester R. M., Goodwin D. H., James N. P., Nelson W. A., Rao C. P., Smith A. M., Taviani M.   +10 more
core   +2 more sources

Inter-Laboratory Comparison of Measuring Organic Carbon and Stable Nitrogen Isotopes in Marine Sediments by Elemental Analysis-Isotope Ratio Mass Spectrometry

Yankuang ceshi, 2020
BACKGROUND Organic carbon and nitrogen stable isotopes (δ13C, δ15N) in marine sediments are used as effective indicators to trace the changes of air, temperature, precipitation and other parameters in different geological time. Elemental analysis-isotope
CHANG Wen-bo, LI Feng, ZHANG Yuan-yuan, HE Xing-liang   +3 more
doaj   +1 more source

Recent developments in heterocycle labeling with carbon isotopes.

Journal of labelled compounds & radiopharmaceuticals, 2018
Heterocycles play an essential role in modern pharmaceutical and agrochemical developments, representing a very common structural unit in marketed drugs. Over the 46 new drugs approved in 2017 by the FDA, 25 contain in their structure a heterocyclic core.
Antonio Del Vecchio, Gianluca Destro, F. Taran, D. Audisio   +3 more
semanticscholar   +1 more source

Carbon isotopic fractionation in molecular clouds [PDF]

Astronomy & Astrophysics, 2020
Context. Carbon fractionation has been studied from a theoretical point of view with different models of time-dependent chemistry, including both isotope-selective photodissociation and low-temperature isotopic exchange reactions. Aims. Recent chemical models predict that isotopic exchange reactions may lead to a depletion of 13C in nitrile-bearing ...
Francesco Fontani, E. Roueff, Paola Caselli, Olli Sipilä, L. Colzi, L. Colzi   +5 more
openaire   +6 more sources

Continuum discretized BCS approach for weakly bound nuclei [PDF]

, 2016
The Bardeen-Cooper-Schrieffer (BCS) formalism is extended by including the single-particle continuum in order to analyse the evolution of pairing in an isotopic chain from stability up to the drip line.
Alonso, C. E., Fortunato, L., Lay, J. A., Vitturi, A.   +3 more
core   +2 more sources

Dry season limnological conditions and basin geology exhibit complex relationships with δ13C and δ15N of carbon sources in four Neotropical floodplains. [PDF]

PLoS ONE, 2017
Studies in freshwater ecosystems are seeking to improve understanding of carbon flow in food webs and stable isotopes have been influential in this work.
Gustavo H Zaia Alves, David J Hoeinghaus, Gislaine I Manetta, Evanilde Benedito   +3 more
doaj   +1 more source