Results 71 to 80 of about 23,934 (219)
Alpha clustering and the stellar nucleosynthesis of carbon [PDF]
Zeitschrift f�r Physik A: Hadrons and Nuclei, 1994 The astrophysical S--factor and reaction rates for the triple--alpha process are calculated in the direct--capture model. It is shown that the stellar carbon production is extremely sensitive to small variations in the N--N interaction.
Oberhummer, H. +6 more
openaire +3 more sources
Geostandards and Geoanalytical Research, Volume 48, Issue 4, Page 863-885, December 2024.Key Points A method is described to obtain high precision Sn isotope ratios using the double spike technique in geological reference materials containing 0.03 to 7 μg g−1 of Sn. δ122/118Sn values are reported for sixteen geological RMs. Improved precision was achieved compared with previous studies by using low concentration Sn analyte.
Dipankar Pathak, Klaus Mezger
wiley +1 more source
The s-process in stellar sites
EPJ Web of Conferences, 2018 Stars are marvellous caldrons where all the elements of the Universe (apartfrom hydrogen and helium) have been synthesized. The solar system chemical distri-butionis the result of many pollution episodes from already extinct stellar generations, occurred
Cristallo Sergio
doaj +1 more source
, 2010 Models of primordial and hyper-metal-poor stars with masses similar to the Sun experience an ingestion of protons into the hot core during the core helium flash phase at the end of their red giant branch evolution.
A. I. Karakas +20 more
core +1 more source
Galactic annihilation emission from nucleosynthesis positrons [PDF]
, 2012 The Galaxy hosts a widespread population of low-energy positrons revealed by successive generations of gamma-ray telescopes through a bright annihilation emission from the bulge region, with a fainter contribution from the inner disk. The exact origin of
Alexis, A. +4 more
core +3 more sources
Geostandards and Geoanalytical Research, Volume 48, Issue 4, Page 795-805, December 2024.Key Points Isotopic reference materials are rarely cross‐examined. An optimised regression model and MC‐ICP‐MS offer a cost‐effective way to assess the reliability of values assigned to multi‐isotope reference materials. A significant lack of consistency has been observed in the long‐standing isotopic reference materials for nickel and zinc. Calibrated
Juris Meija +4 more
wiley +1 more source
Pediatric Blood &Cancer, Volume 71, Issue 11, November 2024.Abstract An attractive flower from the island of Madagascar has in part saved the lives of thousands of children with acute lymphoblastic leukemia (ALL). Random mutations and alterations to the genome led to the evolution of genes encoding enzymes, which would provide the periwinkle flower an arsenal of secondary metabolites to survive within the ...
Jeffrey W. Taub +5 more
wiley +1 more source
Current quests in nucleosynthesis: present and future neutron-induced reaction measurements
EPJ Web of Conferences, 2014 We present some open questions in nucleosynthesis focused on the measurement of relevant neutron capture cross-sections and on new experimental methods.
Praena J. +6 more
doaj +1 more source
Statistical Methods for Thermonuclear Reaction Rates and Nucleosynthesis Simulations [PDF]
, 2014 Rigorous statistical methods for estimating thermonuclear reaction rates and nucleosynthesis are becoming increasingly established in nuclear astrophysics.
Champagne, Art E. +4 more
core +7 more sources
The Role of Rotation on the Yields of the Two γ-Ray Emitters 26Al and 60Fe Ejected by Massive Stars
The Astrophysical JournalWe show that the observed ^60 Fe/ ^26 Al flux ratio provided by the SPectrometer on INTEGRAL satellite (0.24 ± 0.04) can be reproduced only if rotation is taken into account in the computation of the stellar models.
Agnese Falla +3 more
doaj +1 more source