« first day (1337 days earlier)      last day (3064 days later) » 

 
4 hours later…
3:56 PM
@Martin-マーチン <3
Hullo @NotN!
Welcome to the Table!
Hey guys I just got my second "Steward"! \o/
 
4:40 PM
@Ϻ.Λ.Ʀ. Hey! xD
 
@NotNicolaou How're you doin'?
 
Jan
4:51 PM
@Ϻ.Λ.Ʀ. Imposters!
Merry Christmas to everyone who celebrates on the 24th, btway =D
 
Oh yeah, I should pin something.
 
Jan
@Ϻ.Λ.Ʀ. *applauds*
 
@Jan ᕙ(⇀‸↼‶)ᕗ (づ。◕‿‿◕。)づ
Holmium holmium holmium, merry Christmas everyone!
6
 
5:22 PM
@Jan you there?
 
Jan
Yeah?
 
Is this statement true?
> The isotopes with even numbers of N and Z are generally more stable.
 
Jan
Dunno, it’s nuclear physics.
 
IMO it's gibberish, since half of the elements in the periodic table have odd zs.
 
Jan
I wouldn't necessarily say so.
I mean, stability of a nucleus can still be reduced even though the overall nucleus is still damn stable … and I think that there are some kinds of non-trends within radioactivity half-lives, so that even-Z isotopes have longer half-lives or whatever. But then I repeat: I am not a nuclear physicist ;)
And going to have dinner now o/
 
5:43 PM
\o
 
6:00 PM
@Ϻ.Λ.Ʀ. noradsanta.org
 
Hullo @pentavalentcarbon! Welcome to the Table!
 
6:12 PM
6
A: Why is Tin-112 stable, but indium-112 radioactive?

LoongFor isobars (i.e. nuclides with a constant mass number $A$), the binding energy $E$ as a function of the atomic number $Z$ describes a parabola, the so-called valley of β-stability (see also Weizsäcker’s formula or semi-empirical mass formula). $$E = a \cdot Z^2 + b \cdot Z + c \pm d/A^{3/4}$$ ...

 
@Loong K yeah thanks, I'll take a look.
 
@Ϻ.Λ.Ʀ. In short: yes, it's correct.
That's also a reason why you can do fission of U-235 with thermal neutrons, but not of U-238.
 
 
5 hours later…
Jan
11:07 PM
@Mart coming from someone inside the system, which Japanese unis would you suggest for good organic chemistry in general? Just so I know which to treat preferentially when looking for postdoc positions xD
 
Jan
11:51 PM
@ortho congrats on mortarboard =3
 

« first day (1337 days earlier)      last day (3064 days later) »