Talk:Isotopes of calcium

message: According to Wolfram Alpha, which uses much the same sources as this article, Calcium 40 has a half-life of 3E21 years. Which is wrong -- Wolfram Alpha or the article?William Jockusch (talk) 20:45, 22 October 2010 (UTC)
replies: text: I've revised it back to just "Stable".  None of the other isotope tables distinguish theoretically stable from observationally stable, so, unless you want to change all the theoretically unstable isotopes to "observationally stable", this should be left as is XinaNicole (talk) 08:09, 5 July 2011 (UTC)

text: coincidence -- first non-valence (3d) electrons, first neutron-heavy nuclei ?? Calcium-40 is the most massive nucleus to remain stable with equal numbers of protons & neutrons.  All heavier nuclei "prefer" excess neutrons.  And, all heavier nuclei-cum-atoms "stick" electrons into interior, non-valence (d,f) orbitals.  Is that coincidence, between the physics occurring within the nucleus, and between the same and surrounding electrons, significant ? 66.235.38.214 (talk) 05:28, 17 October 2012 (UTC)
thread_title: Talk

message: Is Ca-46 stable?  — Preceding unsigned comment added by 59.126.202.81 (talk) 13:26, 13 August 2012 (UTC)
replies: text: Yes, observationally. Theoretically it can decay by double beta decay to Ti-46, but this has never been observed. Double sharp (talk) 03:13, 2 November 2012 (UTC)

text: The possibility of the Beta minus decay can occur to atoms which have rather loosely bound extra neutrons, since it is then a fairly low energy differential process for them to become a proton and then combine with with another extra neutron to become an integrated deuteron particle. However such a process should be such as to cause the resultant deuteron to be better integrated into the nucleus and thus have a lower retained free energy value. It would also have to be a part of the dynamics of the rotational angular momentum balancing process existing in the nucleus related to its level of rotation. The decay mode is not supposed to be temperature sensitive and therefore not sensitive to the translational velocity of the atoms. The occurrence of high numbers of extra neutrons in an atom is noted to occur in the case of the EE atoms which are better suited by number to the creation of a balanced nuclear structure.WFPM (talk) 03:43, 3 December 2012 (UTC)

text: Below the existence of the isotope EE29Ca40, with 96.941% constituency, the isotope EE20Ca48 is noted in Nubase to decrease to be the lowest mass defect value (-44,214 Kev) of the isotopes of 20Ca Calcium. However it is weakly B- radioactive and eventually decays to EE22Ti48. Also,EO20Ca47 And EO20Ca45 are  both more radioactive and decay to EOTi47 and EOTi45 respectively. However the extra neutron of EE20Ca46 is sufficiently bound to its position in the nucleus (at -43135 Kev) such that it doesn't decay to OE21Sc46 (at -41757 Kev). This data would imply that these isotopes had achieved these extra neutron accumulation conditions during some nuclear accumulation process after which they were permitted to a later time period of decay. It also implies the continued existence of  the capability of maintaining the physical construction properties of the nucleus over a considerable time period.WFPM (talk) 21:51, 8 December 2012 (UTC)
thread_title:  Ca-46 

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