Alfredo Estrade was my collegue at NSCL where he defended his PhD thesis in TOF mass measurements. In this work, that was a collaboration between MSU and LANL, they measure the new masses of 63V, 63Cr, 66Mn and 74Ni.
Atomic masses play a very important role in nuclear astrophysics, and in particular they can be used to understand processes taking place in the crust of accreting neutron stars, where the extreme density condition drives the composition of nuclear matter towards the neutron drip line. Nuclear masses are needed to determine electron capture transition strengths as well as neutron capture rates, calculated with the Hauser-Feshbach model. Are nuclear reactions a heat source in the crust of neutron stars?
more info: http://th-www.if.uj.edu.pl/acta/vol40/pdf/v40p0695.pdf
I had never seen this version of the world map upsidedown and it makes me think how it would be and what would be different ... would we still be drinking caipirinha every day after the talks or we would be happy with a glass of vodka?
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A note or two: the experimental collaboration was also with Oak Ridge, which provided Dan Shapira's expertise working with the position sensitive MCP detectors he developed, and we also had manpower contributions from OSU and LANL. But the main part of the collaboration with Los Alamos was via the calculations of electron capture processes.
ReplyDeleteAlso, the Vanadium mass we measured was 61V. For 63V will have to wait a bit longer...