Talk:Isotopes of lawrencium

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Could ²⁶⁷
Lr be more stable or at least having a comparable t_1⁄2 to ²⁶⁶
Lr?

²⁶⁷
Lr is odd-even, while ²⁶⁶
Lr is odd-odd. I know ²⁶⁷
Lr isn't synthesized, but theoretical calculations can be made. 80.98.179.160 (talk) 11:25, 20 March 2018 (UTC)[reply]

Odd-odd isotopes may actually be more stable in this region of the chart of nuclides because the odd proton and odd neutron both hinder spontaneous fission; see ²⁷⁷Mt (half-life around 5 ms) and ²⁷⁶Mt (half-life around 0.6 s). Double sharp (talk) 14:04, 20 March 2018 (UTC)[reply]

Also note that ²⁶³Lr and ²⁶⁵Lr are expected to be the beta-stable Lr isotopes, so increasingly heavy Lr isotopes should start to suffer β⁻ decay with decreasing half-lives. Double sharp (talk) 04:06, 21 March 2018 (UTC)[reply]

Strange as I readed that odd-odd nuclides have less binding energy than the surrounding odd-even, even-odd, or even-even nuclides. 80.98.179.160 (talk) 19:26, 21 March 2018 (UTC)[reply]

Binding energy isn't everything. Yes, it means that β decay can happen to a nearby even-even nuclide, but it's not the only decay mode here. For many even-even superheavy nuclides, SF happens quite quickly as it is not hindered much: for odd-odd superheavy nuclides, it happens quite slowly, and so we have to wait for the β decay instead. That is why ²⁶⁶Lr is long-lived while its probable daughter ²⁶⁶Rf is not. Furthermore, simple calculations of binding energy only tell you that a decay can happen, not how long it will take (it may be slowed down greatly by other factors). Double sharp (talk) 00:07, 22 March 2018 (UTC)[reply]

Could you please kindly give some references that predict ²⁶³Lr and ²⁶⁵Lr to be beta-stable isotopes? Personally I would guess that the odd-A beta-stable isotopes are ^259,261Md, ^263,265No and ²⁶⁷Lr. The chart predicts ²⁶¹Md, ^263,265No and ²⁶⁷Lr to be beta stable. 129.104.241.214 (talk) 03:41, 3 December 2023 (UTC)[reply]

Not sure where I got that indeed, thanks for the correction. In this old chart ²⁶⁵Lr (but not ²⁶³Lr) is predicted to be the only beta-stable Lr isotope. I wouldn't be surprised if our predictions have improved since then. Double sharp (talk) 08:34, 13 December 2023 (UTC)[reply]

Thanks! It is a pity that we are nowhere close to being able to verfiy either of the predictions. :( 129.104.241.214 (talk) 22:00, 14 December 2023 (UTC)[reply]

Actinoid collisions for transfer reactions (e.g. ²³⁸U+²⁴⁸Cm, or better ²³⁸U+²⁵⁴Es) should allow us to probe this region. So, let's not give up yet. :D For finding ^265,267Lr alone, a long run of ²⁴⁹Bk+⁴⁸Ca would also work: one could search for the 2n channel (needed for ²⁹⁵Ts, which after seven alpha decays reaches ²⁶⁷Lr) and to avoid the 4n chain getting cut off by SF at ²⁸¹Rg or ²⁷⁷Mt. Double sharp (talk) 14:04, 28 December 2023 (UTC)[reply]

Lawrencium is the last element whose most stable isotope can be confirmed with safety

For element 91, 93, 95, 97, the most stable isotope is beta-stable.

99: beta-stable = ²⁵³Es, most stable = ²⁵²Es

101: beta-stable = ²⁵⁹Md (perhaps also ²⁶¹Md), most stable = ²⁵⁸Md

103: beta-stable = ²⁶⁵Lr or ²⁶⁷Lr, most stable = ²⁶⁶Lr

Note that the most stable isotope of nobelium is not known. 129.104.241.242 (talk) 08:50, 6 May 2024 (UTC)[reply]

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Lawrencium is the last element whose most stable isotope can be confirmed with safety

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