Talk:Isotopes of neodymium
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Problem
editHi everyone!
Look, 27.2% (142Nd) + 12.2% (143Nd) + 23.8% (144Nd) + 8.3% (145Nd) + 17.2% (146Nd) + 5.8% (148Nd) + 5.6% (150Nd) =100.10% (but not exactly 100%)
In your case the Standard atomic weight will be 144.384!
Please find and correct mistake!-Surprizi (talk) 11:34, 5 September 2021 (UTC)
- I checked and only from 142Nd we can take out 0.10% to receive Standard atomic weight — 144.242. So in my opinion 142Nd percentage should be 27.1% not 27.2%.-Surprizi (talk) 11:51, 5 September 2021 (UTC)
- Probably there's a rounding error in the table or the source. I will take a look later. ComplexRational (talk) 14:49, 5 September 2021 (UTC)
| 142Nd | 60 | 82 | 141.9077233 | 27.1% | 38.45699301 |
| 143Nd | 60 | 83 | 142.9098143 | 12.2% | 17.43499734 |
| 144Nd | 60 | 84 | 143.9100873 | 23.8% | 34.25060078 |
| 145Nd | 60 | 85 | 144.9125736 | 8.3% | 12.02774361 |
| 146Nd | 60 | 86 | 145.9131169 | 17.2% | 25.09705611 |
| 148Nd | 60 | 88 | 147.9168930 | 5.8% | 8.579179794 |
| 150Nd | 60 | 90 | 149.9208910 | 5.6% | 8.395569896 |
| Ar, stand.(Nd) | 100% | 144.242141 |
This is my calculations with corrections from 27.2% to 27.1%.-Surprizi (talk) 18:43, 5 September 2021 (UTC)
- Standard atomic weight is given in {{CIAAW2017}}[1]. In fact, this source is already present in the article. -DePiep (talk) 19:12, 5 September 2021 (UTC)
- It's because 142Nd is 27.152(40)% which was rounded to 27.2%. Double sharp (talk) 14:02, 30 December 2023 (UTC)
References
- ^ "Standard atomic weights of 14 chemical elements revised". CIAAW. 2018-06-05.
Possible α decay of several isotopes of neodymium
editAccording to [1], 143Nd (N = 83), 145Nd (N = 85) and 146Nd (N = 86) should respectively have an α decay half-life at the order of 1088 years, 1022 years and 1034 years. Given the trend, 147Nd (N = 87) may have an alpha decay partial half-life at the order of 1052 years. 148Nd (N = 88) should have an α decay half-life at the order of 1070 years. Note that alpha decay of 146Nd would be non-ignorable (having significant branching ratio) compared to the theoretical half-life of double beta decay at the order of either 1028 years given in [2], [3] or 1033 years given in [4].
139Nd (N = 79) and 149Nd (N = 89) have respectively an alpha decay energy of 0.21 MeV and 0.29 MeV, which is quite low, so alpha decay may be possible but with a partial half-life long beyond imagination. 129.104.241.214 (talk) 09:43, 4 November 2023 (UTC) and Cristiano Toàn (talk) 02:41, 26 January 2024 (UTC)
Note that 142Nd is much too stable
editIt is 1.6698 MeV lighter than the average mass of 138Ce and 146Sm. 14.52.231.91 (talk) 00:30, 16 August 2024 (UTC)
Neodymium-143
editAccording to here, 143Nd has indeed a very long half-life. Although 155Gd and 162Dy have longer alpha decay half-life among those nuclides stable to beta decay and double beta decay, perhaps their cluster decay half-lives are shorter (see here). For 143Nd, its cluster decay should be negligable compared to alpha decay. 14.52.231.91 (talk) 01:14, 16 August 2024 (UTC)