Isotopes of nihonium

Short description: Nuclides with atomic number of 113 but with different mass numbers

Main isotopes of Chemistry:nihonium (113Nh) | Iso­tope | Decay

|

| abun­dance | half-life (t1/2) | mode | pro­duct
278Nh  | syn | 1.4 ms  | α | 274Rg
282Nh  | syn  | 73 ms  | α  | 278Rg
283Nh  | syn  | 75 ms  | α  | 279Rg
284Nh  | syn  | 0.91 s  | α  | 280Rg
EC | 284Cn
285Nh  | syn  | 4.2 s  | α  | 281Rg
286Nh  | syn  | 9.5 s  | α  | 282Rg
287Nh[1] | syn  | 5.5 s?  | α  | 283Rg
290Nh[2] | syn  | 2 s?  | α  | 286Rg
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Nihonium (113Nh) is a synthetic element. Being synthetic, a standard atomic weight cannot be given and like all artificial elements, it has no stable isotopes. The first isotope to be synthesized was 284Nh as a decay product of 288Mc in 2003. The first isotope to be directly synthesized was 278Nh in 2004. There are 6 known radioisotopes from 278Nh to 286Nh, along with the unconfirmed 287Nh and 290Nh. The longest-lived isotope is 286Nh with a half-life of 9.5 seconds.

## Contents

* 1 List of isotopes
* 2 Isotopes and nuclear properties
* 2.1 Nucleosynthesis
* 2.1.1 Cold fusion
* 2.1.2 Hot fusion
* 2.1.3 As decay product
* 2.2 Theoretical calculations
* 2.2.1 Evaporation residue cross sections
* 3 References

## List of isotopes

Nuclide
| Z | N | Isotopic mass (u)
[n 1][n 2] | Half-life
| Decay
mode
[n 3] | Daughter
isotope
| Spin and
parity

|
|
|
|
|
|
|

278Nh[3] | 113  | 165  | 278.17058(20)#  | 2.0+2.7
−0.7 ms | α | 274Rg  |
282Nh  | 113  | 169  | 282.17567(39)#  | 61+73
−22 ms[4] | α  | 278Rg  |
283Nh[n 4] | 113  | 170  | 283.17657(52)#  | 123+80
−35 ms[4] | α  | 279Rg  |
284Nh[n 5] | 113  | 171  | 284.17873(62)#  | 0.90+0.07
−0.06 s[4] | α (≥99%)  | 280Rg  |
EC (≤1%)[4] | 284Cn
285Nh[n 6] | 113  | 172  | 285.17973(89)#  | 2.1+0.6
−0.3 s[4] | α (82%)  | 281Rg  |
SF (18%)[4] | (various)
286Nh[n 7] | 113  | 173  | 286.18221(72)#  | 9.5 s  | α  | 282Rg  |
287Nh[n 8] | 113  | 174  | 287.18339(81)#  | 5.5 s  | α  | 283Rg  |
290Nh[n 9] | 113  | 177  |  | 2 s?  | α  | 286Rg  |

1. ↑ ( ) - Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
2. ↑ # - Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
3. ↑ Modes of decay:  EC: | Electron capture

|

4. ↑ Not directly synthesized, occurs as decay product of 287Mc
5. ↑ Not directly synthesized, occurs as decay product of 288Mc
6. ↑ Not directly synthesized, occurs in decay chain of 293Ts
7. ↑ Not directly synthesized, occurs in decay chain of 294Ts
8. ↑ Not directly synthesized, occurs in decay chain of 287Fl; unconfirmed
9. ↑ Not directly synthesized, occurs in decay chain of 290Fl and 294Lv; unconfirmed

## Isotopes and nuclear properties

### Nucleosynthesis

Super-heavy elements such as nihonium are produced by bombarding lighter elements in particle accelerators that induce fusion reactions. Whereas most of the isotopes of nihonium can be synthesized directly this way, some heavier ones have only been observed as decay products of elements with higher atomic numbers.[5]

Depending on the energies involved, the former are separated into "hot" and "cold". In hot fusion reactions, very light, high-energy projectiles are accelerated toward very heavy targets (actinides), giving rise to compound nuclei at high excitation energy (~40–50 MeV) that may either fission or evaporate several (3 to 5) neutrons.[6] In cold fusion reactions, the produced fused nuclei have a relatively low excitation energy (~10–20 MeV), which decreases the probability that these products will undergo fission reactions. As the fused nuclei cool to the ground state, they require emission of only one or two neutrons, and thus, allows for the generation of more neutron-rich products.[5] The latter is a distinct concept from that of where nuclear fusion claimed to be achieved at room temperature conditions (see cold fusion).[7]

#### Cold fusion

Before the synthesis of nihonium by the RIKEN team, scientists at the Institute for Heavy Ion Research (Gesellschaft für Schwerionenforschung) in Darmstadt, Germany also tried to synthesize nihonium by bombarding bismuth-209 with zinc-70 in 1998. No nihonium atoms were identified in two separate runs of the reaction.[8] They repeated the experiment in 2003 again without success.[8] In late 2003, the emerging team at RIKEN using their efficient apparatus GARIS attempted the reaction and reached a limit of 140 fb. In December 2003 – August 2004, they resorted to "brute force" and carried out the reaction for a period of eight months. They were able to detect a single atom of 278Nh.[9] They repeated the reaction in several runs in 2005 and were able to synthesize a second atom,[10] followed by a third in 2012.[11]

The table below contains various combinations of targets and projectiles which could be used to form compound nuclei with Z=113.

Target | Projectile | CN | Attempt result

|
|
|

208Pb  | 71Ga | 279Nh | Reaction yet to be attempted
209Bi  | 70Zn | 279Nh | Successful reaction
238U  | 45Sc | 283Nh | Reaction yet to be attempted
237Np  | 48Ca | 285Nh | Successful reaction
244Pu  | 41K | 285Nh | Reaction yet to be attempted
250Cm  | 37Cl | 287Nh | Reaction yet to be attempted
248Cm  | 37Cl | 285Nh | Reaction yet to be attempted

#### Hot fusion

In June 2006, the Dubna-Livermore team synthesised nihonium directly by bombarding a neptunium-237 target with accelerated calcium-48 nuclei, in a search for the lighter isotopes 281Nh and 282Nh and their decay products, to provide insight into the stabilizing effects of the closed neutron shells at N = 162 and N = 184:[12]

23793Np \+ 4820Ca → 282113Nh \+ 3 10n

Two atoms of 282Nh were detected.[12]

#### As decay product

List of nihonium isotopes observed by decay  Evaporation residue | Observed nihonium isotope

|

294Lv, 290Fl ? | 290Nh ?[2]
287Fl ? | 287Nh ?[13]
294Ts, 290Mc | 286Nh[14]
293Ts, 289Mc | 285Nh[14]
288Mc | 284Nh[15]
287Mc | 283Nh[15]
286Mc | 282Nh

Nihonium has been observed as a decay product of moscovium (via alpha decay). Moscovium currently has five known isotopes; all of them undergo alpha decays to become nihonium nuclei, with mass numbers between 282 and 286. Parent moscovium nuclei can be themselves decay products of tennessine. It may also occur as a decay product of flerovium (via electron capture), and parent flerovium nuclei can be themselves decay products of livermorium.[16] For example, in January 2010, the Dubna team (JINR) identified nihonium-286 as a product in the decay of tennessine via an alpha decay sequence:[14]

294117Ts → 290115Mc \+ 42He
290115Mc → 286113Nh \+ 42He

### Theoretical calculations

#### Evaporation residue cross sections

The below table contains various targets-projectile combinations for which calculations have provided estimates for cross section yields from various neutron evaporation channels. The channel with the highest expected yield is given.

DNS = Di-nuclear system; σ = cross section

Target | Projectile | CN | Channel (product) | σmax | Model | Ref

|
|
|
|
|
|

209Bi  | 70Zn | 279Nh | 1n (278Nh) | 30 fb | DNS | [17]
238U  | 45Sc | 283Nh | 3n (280Nh) | 20 fb | DNS | [18]
237Np  | 48Ca | 285Nh | 3n (282Nh) | 0.4 pb | DNS | [19]
244Pu  | 41K | 285Nh | 3n (282Nh) | 42.2 fb | DNS | [18]
250Cm  | 37Cl | 287Nh | 4n (283Nh) | 0.594 pb | DNS | [18]
248Cm  | 37Cl | 285Nh | 3n (282Nh) | 0.26 pb | DNS | [18]

## References

1. ↑ Hofmann, S.; Heinz, S.; Mann, R.; Maurer, J.; Münzenberg, G.; Antalic, S.; Barth, W.; Burkhard, H. G. et al. (2016). "Remarks on the Fission Barriers of SHN and Search for Element 120". Exotic Nuclei. pp. 155–164. ISBN 9789813226555.
2. ↑ 2.0 2.1 Hofmann, S.; Heinz, S.; Mann, R.; Maurer, J.; Münzenberg, G.; Antalic, S.; Barth, W.; Burkhard, H. G. et al. (2016). "Review of even element super-heavy nuclei and search for element 120". The European Physics Journal A 2016 (52). doi:10.1140/epja/i2016-16180-4.
3. ↑ Morita, Kosuke; Morimoto, Kouji; Kaji, Daiya; Haba, Hiromitsu; Ozeki, Kazutaka; Kudou, Yuki; Sumita, Takayuki; Wakabayashi, Yasuo et al. (15 October 2012). "New Result in the Production and Decay of an Isotope, 278 113, of the 113th Element" (in en). Journal of the Physical Society of Japan 81 (10): 103201. doi:10.1143/JPSJ.81.103201. ISSN 0031-9015. Bibcode: 2012JPSJ...81j3201M. https://journals.jps.jp/doi/abs/10.1143/JPSJ.81.103201. Retrieved 29 June 2023.
4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Oganessian, Yu. Ts.Expression error: Unrecognized word "et". (2022). "New isotope 286Mc produced in the 243Am+48Ca reaction". Physical Review C 106 (64306): 064306. doi:10.1103/PhysRevC.106.064306. Bibcode: 2022PhRvC.106f4306O.
5. ↑ 5.0 5.1 Armbruster, Peter; Münzenberg, Gottfried (1989). "Creating superheavy elements". Scientific American 34: 36–42.
6. ↑ Barber, Robert C.; Gäggeler, Heinz W.; Karol, Paul J.; Nakahara, Hiromichi; Vardaci, Emanuele; Vogt, Erich (2009). "Discovery of the element with atomic number 112 (IUPAC Technical Report)". Pure and Applied Chemistry 81 (7): 1331. doi:10.1351/PAC-REP-08-03-05.
7. ↑ Fleischmann, Martin; Pons, Stanley (1989). "Electrochemically induced nuclear fusion of deuterium". Journal of Electroanalytical Chemistry and Interfacial Electrochemistry 261 (2): 301–308. doi:10.1016/0022-0728(89)80006-3.
8. ↑ 8.0 8.1 "Search for element 113" , Hofmann et al., GSI report 2003. Retrieved on 3 March 2008
9. ↑ Morita, Kosuke; Morimoto, Kouji; Kaji, Daiya; Akiyama, Takahiro; Goto, Sin-Ichi; Haba, Hiromitsu; Ideguchi, Eiji; Kanungo, Rituparna et al. (2004). "Experiment on the Synthesis of Element 113 in the Reaction 209Bi(70Zn, n)278113". Journal of the Physical Society of Japan 73 (10): 2593–2596. doi:10.1143/JPSJ.73.2593. Bibcode: 2004JPSJ...73.2593M.
10. ↑ Barber, Robert C.; Karol, Paul J; Nakahara, Hiromichi; Vardaci, Emanuele; Vogt, Erich W. (2011). "Discovery of the elements with atomic numbers greater than or equal to 113 (IUPAC Technical Report)". Pure and Applied Chemistry 83 (7): 1485. doi:10.1351/PAC-REP-10-05-01.
11. ↑ K. Morita; Morimoto, Kouji; Kaji, Daiya; Haba, Hiromitsu; Ozeki, Kazutaka; Kudou, Yuki; Sumita, Takayuki; Wakabayashi, Yasuo et al. (2012). "New Results in the Production and Decay of an Isotope, 278113, of the 113th Element". Journal of the Physical Society of Japan 81 (10): 103201. doi:10.1143/JPSJ.81.103201. Bibcode: 2012JPSJ...81j3201M.
12. ↑ 12.0 12.1 Oganessian, Yu. Ts.; Utyonkov, V.; Lobanov, Yu.; Abdullin, F.; Polyakov, A.; Sagaidak, R.; Shirokovsky, I.; Tsyganov, Yu. et al. (2007). "Synthesis of the isotope 282113 in the 237Np+48Ca fusion reaction". Physical Review C 76 (1): 011601(R). doi:10.1103/PhysRevC.76.011601. Bibcode: 2007PhRvC..76a1601O. http://nrv.jinr.ru/pdf_file/PhysRevC_76_011601.pdf.
13. ↑ Hofmann, S.; Heinz, S.; Mann, R.; Maurer, J.; Münzenberg, G.; Antalic, S.; Barth, W.; Burkhard, H. G. et al. (2016). "Remarks on the Fission Barriers of SHN and Search for Element 120". Exotic Nuclei. pp. 155–164. ISBN 9789813226555.
14. ↑ 14.0 14.1 14.2 Oganessian, Yu. Ts.; Abdullin, F. Sh.; Bailey, P. D.; Benker, D. E.; Bennett, M. E.; Dmitriev, S. N.; Ezold, J. G.; Hamilton, J. H. et al. (2010). "Synthesis of a New Element with Atomic Number Z=117". Physical Review Letters 104 (14): 142502. doi:10.1103/PhysRevLett.104.142502. PMID 20481935. Bibcode: 2010PhRvL.104n2502O.
15. ↑ 15.0 15.1 Oganessian, Yu. Ts.; Penionzhkevich, Yu. E.; Cherepanov, E. A. (2007). "Heaviest Nuclei Produced in 48Ca-induced Reactions (Synthesis and Decay Properties)". AIP Conference Proceedings. 912. pp. 235–246. doi:10.1063/1.2746600.
16. ↑ Sonzogni, Alejandro. "Interactive Chart of Nuclides". National Nuclear Data Center: Brookhaven National Laboratory. http://www.nndc.bnl.gov/chart/reCenter.jsp?z=113&n=173.
17. ↑ Feng, Zhao-Qing; Jin, Gen-Ming; Li, Jun-Qing; Scheid, Werner (2007). "Formation of superheavy nuclei in cold fusion reactions". Physical Review C 76 (4): 044606. doi:10.1103/PhysRevC.76.044606. Bibcode: 2007PhRvC..76d4606F.
18. ↑ 18.0 18.1 18.2 18.3 Feng, Z.; Jin, G.; Li, J. (2009). "Production of new superheavy Z=108-114 nuclei with 238U, 244Pu and 248,250Cm targets". Physical Review C 80 (5): 057601. doi:10.1103/PhysRevC.80.057601.
19. ↑ Feng, Z; Jin, G; Li, J; Scheid, W (2009). "Production of heavy and superheavy nuclei in massive fusion reactions". Nuclear Physics A 816 (1–4): 33–51. doi:10.1016/j.nuclphysa.2008.11.003. Bibcode: 2009NuPhA.816...33F.

* Isotope masses from:
* M. Wang et al. (2012). "The AME2012 atomic mass evaluation (II). Tables, graphs and references.". Chinese Physics C 36 (12): 1603–2014. doi:10.1088/1674-1137/36/12/003. Bibcode: 2012ChPhC..36....3M. http://amdc.in2p3.fr/masstables/Ame2012/Ame2012b-v2.pdf.
* Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A 729: 3–128, doi:10.1016/j.nuclphysa.2003.11.001, Bibcode: 2003NuPhA.729....3A, https://hal.archives-ouvertes.fr/in2p3-00020241/document
* Isotopic compositions and standard atomic masses from:
* Wieser, Michael E. (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry 78 (11): 2051–2066. doi:10.1351/pac200678112051.
* Half-life, spin, and isomer data selected from the following sources.
* Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A 729: 3–128, doi:10.1016/j.nuclphysa.2003.11.001, Bibcode: 2003NuPhA.729....3A, https://hal.archives-ouvertes.fr/in2p3-00020241/document
* National Nuclear Data Center. "NuDat 2.x database". Brookhaven National Laboratory. http://www.nndc.bnl.gov/nudat2/.
* Lide, David R., ed (2004). "11. Table of the Isotopes". CRC Handbook of Chemistry and Physics (85th ed.). Boca Raton, Florida: CRC Press. ISBN 978-0-8493-0485-9.

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