ComplexRational

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Happy First Edit Day!

@DaniloDaysOfOurLives: Thank you! ^Complex/_Rational 22:53, 28 October 2024 (UTC)

Silicon-45 and 46 discovered

New paper. Also of interest to Nucleus hydro elemon. :) Double sharp (talk) 04:26, 1 November 2024 (UTC)

@Double sharp: Cool, thanks! Fortunately this one is open-access. ^Complex/_Rational 13:50, 1 November 2024 (UTC)

Another exciting discovery, thanks! It seems like all the recent discoveries are light nuclides. For the heavier nuclides, it seems like light isotopes perform better in synthesizing Uue. Nucleus hydro elemon (talk) 13:53, 1 November 2024 (UTC)

@Nucleus hydro elemon: I suspect people stick to the heavy ones because they want the half-life of the product to be long enough to detect. ;) Double sharp (talk) 03:49, 2 November 2024 (UTC)

doi:10.1142/S0218301320500536 predicts among ^284-308Uue, ^296,300,302Uue have a half-life of >100 μs. (^297,308Uue may reach this bar or not depends on prediction used) Only ²⁹⁶Uue is a reasonable long-lived isotope to be synthesized among them. ²⁹⁷Uue requires either 2n channel, ²⁵⁰Cm, or einsteinium, while even heavier isotopes are more unlikely to produce.

On the other hand, I found lighter isotopes ^292,293Uue interesting because the whole decay chain is unknown. However, their predicted half-lives of ~30 μs is troublesome. Nucleus hydro elemon (talk) 08:22, 2 November 2024 (UTC)

If only ²⁴¹Am+⁴⁸Ca and ²³¹Pa+⁴⁸Ca would get studied. :( Double sharp (talk) 12:06, 2 November 2024 (UTC)

It does indeed seem that even-Z SHEs have been getting much of the attention lately. Meanwhile, the gap between cold and hot fusion persists for odd-Z elements, and Mt and Rg each have one isotope that has been directly synthesized... decades ago. ^Complex/_Rational 16:32, 2 November 2024 (UTC)

Since you mention ²⁶⁶Mt from 1982: Peter Armbruster and Gottfried Münzenberg both died this year. :( (Sigurd Hofmann died in 2022.) Double sharp (talk) 16:36, 2 November 2024 (UTC)

I guess the even-Z gap gets studied more because it looks like 120 is going to be easier than 119. Maybe once 120 is discovered, we'll see a renaissance of interest in the odd ones. Double sharp (talk) 16:43, 2 November 2024 (UTC)

@Double sharp: I stumbled upon this, which mentions a proposed search for ²⁷⁶Rg and ²⁷²Mt (along with ²⁵⁰Lr and ²⁵⁴Db) – though neither a reaction nor an experimental timeframe are described. If year 1 was 2020, we're in year 5, and I haven't found anything more recent, so I wonder what became of this.

There was also an SHE-related conference earlier this year at FRIB, though I don't know if the conference proceedings have been uploaded anywhere. ^Complex/_Rational 02:06, 11 November 2024 (UTC)

Well, the ⁵⁰Ti agenda happened quite similarly to the plan of those slides, with the ²⁴⁴Pu+⁵⁰Ti reaction having succeeded. Perhaps the other things happened, or perhaps it was decided that going for 120 was more exciting. Yeah, that's kind of a non-answer. ;) Double sharp (talk) 04:29, 11 November 2024 (UTC)

²⁴²Pu+⁵⁰Ti

New presentation from JINR! With ²⁸⁹Lv! And ²⁸⁰Cn! And a p2n channel leading to ²⁸⁹Mc!! Double sharp (talk) 15:19, 2 November 2024 (UTC)

@Nucleus hydro elemon: Since you just noted that lately it had mostly been light nuclides getting discovered! :D Double sharp (talk) 15:20, 2 November 2024 (UTC)

@Double sharp: Thanks for sharing the exciting news! I suppose the new isotopes could be added, but I'm not sure that WP:CALC permits computing half-lives in the absence of aggregated data and complete analysis... so a more detailed update will likely have to wait. ^Complex/_Rational 15:34, 2 November 2024 (UTC)

Yeah, I've confined myself to just adding their existence. (Well, I guess their colour in the Table of nuclides can be handwaved as obvious; computing the detailed half-life is too much, but it's too obvious that it must be <1 d. :D) Double sharp (talk) 15:34, 2 November 2024 (UTC)

As the decay chain of ²⁸⁹Lv passes through ²⁶⁹Sg, its half-life must be revised. Perhaps the most stable isotope of Sg will become ²⁶⁹Sg again. Nucleus hydro elemon (talk) 06:52, 3 November 2024 (UTC)

Wow, one more nuclide with Z:N = 2:3 found, whoopee! Discovering ²⁹⁵Og in the future would complete this huge family from ⁵He to ²⁹⁵Og, spanning from the beginning to the end of the periodic table. 129.104.65.2 (talk) 00:06, 3 November 2024 (UTC)

I'm looking forward to synthesis of ^295,296Og with ^250,251,252Cf + ⁴⁸Ca and ²⁴⁸Cm + ⁵⁰Ti. Besides that, I'm also hoping for the discovery of ²⁹³Og to clean up Ninov's mess completely. Nucleus hydro elemon (talk) 06:59, 3 November 2024 (UTC)

@Nucleus hydro elemon: You know what else I want? A sustained search for the pxn channel from ²⁴⁸Cm+⁴⁸Ca to get heavier Mc isotopes (to see if they really electron-capture their way to the middle of the island), plus sustained looks at ²⁴²Cm+⁴⁸Ca to get even lighter Lv isotopes. And the odd-Z cases too, but you already know that. I guess the dream of using ²⁵⁰Cm will have to languish in limbo for a long while. :)

I guess a sustained ²⁴⁹Cf+⁴⁸Ca campaign might well actually find ²⁹³Og in the 4n channel. Double sharp (talk) 07:03, 3 November 2024 (UTC)

²⁴⁸Cm(⁴⁸Ca,p3n)²⁹²Mc has extremely bad cross section (12 fb). I found nothing about ²⁴²Cm+⁴⁸Ca, probably because ²⁴²Cm is too unstable, even more unstable than ²⁴⁹Bk. I think ^238-240Pu+⁵⁰Ti makes more sense, but there exists only a prediction 43 years ago, which states ²³⁸Pu(⁴⁸Ca,4n)²⁸⁴Lv has a cross section of a few pb.

I have a complicated feeling towards nuclides at the island of stability, especially if they have a half-life in centuries or millennia. After formed from the EC chain, the atom will outlive any SHE researcher, so no one can know its decay properties. It might be hard to detect the existence of this long-lived atom. I don't think chemistry can be done, as chemistry done in a single atom relies on its radioactive decay, which this long-lived atom will never do in a reasonable timeframe. Nucleus hydro elemon (talk) 08:06, 3 November 2024 (UTC)

@Nucleus hydro elemon: True, but I guess an ER that has no plausible SF event following it would be quite a sign that the island's been reached at least. And yeah, ²⁴²Cm is perhaps a bit ambitious, but at least ²⁴³Cm has a half-life of a few decades and will get us most of the way. :) Double sharp (talk) 08:11, 3 November 2024 (UTC)

Found a prediction about ²⁴³Cm+^46,48Ca. It also predicts ²⁴⁵Cm+⁴⁶Ca, but this reaction is worse than ²⁴³Cm+⁴⁸Ca in all channels, so I ignored it. Cross sections are square bracketed and in pb.

• ²⁴³Cm(⁴⁸Ca,3n)²⁸⁸Lv [1.53]
• ²⁴³Cm(⁴⁸Ca,4n)²⁸⁷Lv [0.36]
• ²⁴³Cm(⁴⁸Ca,5n)²⁸⁶Lv [0.29]
• ²⁴³Cm(⁴⁶Ca,3n)²⁸⁶Lv [1.69]
• ²⁴³Cm(⁴⁶Ca,4n)²⁸⁵Lv [0.27]
• ²⁴³Cm(⁴⁶Ca,5n)²⁸⁴Lv [0.17]

Nucleus hydro elemon (talk) 09:59, 3 November 2024 (UTC)

The funny thing is that ²⁴⁴Pu+⁵⁰Ti (0.44+0.58
−0.28 pb) seems to have a larger cross-section than ²⁰⁸Pb+⁷⁰Zn (0.078+0.179
−0.065 pb). If not for the serendipitous ²⁹⁴Og atom produced in 2012 during a Ts campaign (when the ²⁴⁹Bk target had significantly decayed), I wonder if it might've been tried last decade, as it would both confirm 118 by producing its daughter ²⁹⁰Lv, and provide useful experience with ⁵⁰Ti back when people were already thinking about 119 and 120. Though looking at the trend, it seems distressingly plausible that current technology levels have simply made 119 and 120 go from "it's not gonna happen" to "sure, if you're willing to spend years and years like RIKEN did with 113"... Double sharp (talk) 08:14, 3 November 2024 (UTC)

The source I added to moscovium also discusses αxn channels, and suggests they may be more favorable to produce heavier Mc isotopes from ²⁴⁹Bk and ⁴⁸Ca. On the other side, some of the neutron deficient even–even isotopes may have very short SF half-lives (predicted by several sources and supported by observations of ²⁸⁴Fl, ²⁸²Cn, and now ²⁸⁰Cn), so they may not be readily detectable even with cross sections within experimental detection limits. ^Complex/_Rational 15:08, 3 November 2024 (UTC)

I'm kind of wondering how we should handle the successful pxn – it doesn't fit quite well with how the superheavy "isotopes of X" pages are currently handled. Well, what a happy problem to have! Double sharp (talk) 15:53, 2 November 2024 (UTC)

@Double sharp: And a happy problem to solve! Time to update island of stability next while we await detailed results. ^Complex/_Rational 16:08, 2 November 2024 (UTC)

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Plutonium-226

@ComplexRational and Nucleus hydro elemon: JINR preprint (in Russian). See p. 7: it alpha decays with a lower half-life limit of 1 ms. :) Double sharp (talk) 08:04, 9 November 2024 (UTC)

Interesting :) Its predicted alpha half-life is 1.3 ms (doi:10.1016/j.physletb.2022.137569), which is consistent with the experimental half-life >1 ms. The prediction also predicts its double alpha half-life will be 537 ms.

Looking forward to the publication and additional discoveries. Also hoping that some of the missing or poorly-studied isotopes described in NUBASE2020 are the subject of future work. ^Complex/_Rational 01:57, 11 November 2024 (UTC)

By the way, ²²²Rn is also listed in the list of nuclides predicted with shortest double alpha half-lives. With a predicted half-life of 3 years, this decay mode is observable. Unfortunately, I'm not sure is there a way to separate ²²²Rn→²¹⁸Po→²¹⁴Pb and direct ²²²Rn→²¹⁴Pb. Nucleus hydro elemon (talk) 11:15, 9 November 2024 (UTC)

If I'm understanding correctly, there should be a measurable time delay if ²¹⁸Po is produced as an intermediate product, whereas double alpha decay would feature both alphas emitted simultaneously. I haven't read many articles about this, but I'd instead think it would be harder to distinguish double alpha decay from ⁸Be cluster emission. ^Complex/_Rational 01:57, 11 November 2024 (UTC)

According to the predictions, double alpha decays (if we have method to distinguish them from two separate alpha decays) of ¹⁴⁸Sm and ¹⁵²Gd are clearly observable! (Perhaps also ¹⁵⁰Gd and ¹⁵⁴Dy, if these two nuclides are available). 129.104.241.5 (talk) 23:12, 13 November 2024 (UTC)

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Note

https://en.m.wikipedia.org/w/index.php?title=User:Infotalks23&redlink=1

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2 socks of blocked user "fasil" showed up... last link has personal style and more updates or deletions by native speakers welcome. Cenderabird (talk) 13:54, 16 November 2024 (UTC)

@Cenderabird: It's not clear to me what you're asking. If this is a content-related issue, I encourage you to fix it yourself or discuss it on the article's talk page, and if you suspect a person is inappropriately using multiple accounts, please open a sockpuppet investigation. Thanks, ^Complex/_Rational 03:47, 17 November 2024 (UTC)

Forgot to include the redirect 1998 in California in redirects for discussion

At Wikipedia:Redirects for discussion/Log/2024 November 3#1996 in California I accidentally skipped over 1998 in California in the list, so it didn't get deleted with the others. Can you delete plz. HertzDonuts (talk) 21:08, 17 November 2024 (UTC)

@HertzDonuts: Deleted, as I saw that you had tagged it along with the others, and it had the same trivial history. ^Complex/_Rational 22:50, 17 November 2024 (UTC)

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It was great to meet you. If I see any unsourced math stubs, I will alert you. Bearian (talk) 22:51, 22 November 2024 (UTC)

@Bearian: Nice meeting you as well. Feel free to drop by here (although there are still some math articles I don't dare touch), and I look forward to seeing you at future meetups. ^Complex/_Rational 23:14, 22 November 2024 (UTC)

Chemical study of nihonium and moscovium

Somehow I missed this from two months ago, but okay, better late than never. I think this is the first investigation of moscovium. (And it is also stated that there are promising methods for studying millisecond-lifetime Lv and Ts.) :) Double sharp (talk) 10:38, 27 November 2024 (UTC)

Exciting news! I think Lv is doable, but I don't think chemistry of Ts can be done if the berkelium target needed for Ts production is so hard to obtain. :(

By the way, is there any new predictions about Ts? After At is predicted to be a metal with density ~9 g/cm³, the "semimetallic" and low density of ~7 g/cm³ at the infobox of Ts looks outdated. Nucleus hydro elemon (talk) 13:19, 27 November 2024 (UTC)

@Nucleus hydro elemon: Not aware of any bulk predictions. I'm indeed convinced that Ts should be a metal, but the best source I have for that is just Andreas Hermann's guess in 2013 back when the metallic At prediction first came out. Double sharp (talk) 13:24, 27 November 2024 (UTC)

Interesting. And it looks like Mt, Ds, and Rg will continue to be ignored, even though at least Rg is arguably more accessible than Ts (easier synthesis and longer half-lives - at least of the granddaughters of Mc). ^Complex/_Rational 14:30, 27 November 2024 (UTC)

The reasoning given by their articles is there are no volatile compounds of Mt, Ds, Rg without fluorine. If we somehow managed to do SHE fluorine chemistry, then the volatile fluorides DbF₅, SgF_5,6, BhF_5,6,7 and HsF_5,6,(7,8)? can be studied. Nucleus hydro elemon (talk) 14:49, 27 November 2024 (UTC)

There's no Au hexafluoride, so I kind of doubt there is a Rg one either. Double sharp (talk) 14:57, 27 November 2024 (UTC)