Naturally occurring isotopes
| Isotope | Mass / Da | Natural abundance (atom %) | Nuclear spin (I) | Magnetic moment (μ/μN) |
|---|---|---|---|---|
| nil |
Radiosotope data
| Isotope | Mass / Da | Half-life | Mode of decay | Nuclear spin | Nuclear magnetic moment |
|---|---|---|---|---|---|
| 234Np | 234.04289 | 4.4 d | EC to234U | 0 | |
| 235Np | 235.04406 | 1.058 y | EC to235U; α to231Pa | 5/2 | |
| 236Np | 236.04657 | 155000 y | EC to236U; α to232Pa; β- to236Pu | 6 | |
| 237Np | 237.0481678 (23) | 2.14 x 106 y | α to233Pa; SF | 5/2 | 3.14 |
| 238Np | 238.05094 | 2.117 d | β- to238Pu | 2 | |
| 239Np | 239.05293 | 2.355 d | β- to239Pu | 5/2 |
References
- Naturally occurring isotope abundances: Commission on Atomic Weights and Isotopic Abundances report for the International Union of Pure and Applied Chemistry inIsotopic Compositions of the Elements 1989, Pure and Applied Chemistry, 1998,70, 217. [Copyright 1998 IUPAC]
- For further information about radioisotopes see Jonghwa Chang's (Korea Atomic Energy Research Institute)Table of the Nuclides
- Masses, nuclear spins, and magnetic moments: I. Mills, T. Cvitas, K. Homann, N. Kallay, and K. Kuchitsu inQuantities, Units and Symbols in Physical Chemistry, Blackwell Scientific Publications, Oxford, UK, 1988. [Copyright 1988 IUPAC]
NMR Properties of neptunium
Common reference compound: .
| Isotope 1 | Isotope 2 | Isotope 3 | |
|---|---|---|---|
| Isotope | 237Np | ||
| Natural abundance/% | 0 | ||
| Spin (I) | 5/2 | ||
| Frequency relative to1H = 100 (MHz) | 11.25 | ||
| Receptivity, DP, relative to1H = 1.00 | - | ||
| Receptivity, DC, relative to13C = 1.00 | - | ||
| Magnetogyric ratio, γ (107 rad T‑1 s-1) | 3.1 | ||
| Magnetic moment, μ (μN) | 2.5 | ||
| Nuclear quadrupole moment, Q/millibarn | +3886(6) and 3850(40) [Mössbauer state] | ||
| Line width factor, 1056 l (m4) | 5.6 |
References
- R.K. Harris inEncyclopedia of Nuclear Magnetic Resonance, D.M. Granty and R.K. Harris, (eds.), vol. 5, John Wiley & Sons, Chichester, UK, 1996. I am grateful toProfessor Robin Harris (University of Durham, UK) who provided much of the NMR data, which are copyright 1996 IUPAC, adapted from his contribution contained within this reference.
- J. Mason inMultinuclear NMR, Plenum Press, New York, USA, 1987. Where given, data for certain radioactive nuclei are from this reference.
- P. Pyykkö,Mol. Phys., 2008,106, 1965-1974.
- P. Pyykkö,Mol. Phys., 2001,99, 1617-1629.
- P. Pyykkö,Z. Naturforsch., 1992,47a, 189. I am grateful toProfessor Pekka Pyykkö (University of Helsinki, Finland) who provided the nuclear quadrupole moment data in this and the following two references.
- D.R. Lide, (ed.),CRC Handbook of Chemistry and Physics 1999-2000 : A Ready-Reference Book of Chemical and Physical Data (CRC Handbook of Chemistry and Physics, CRC Press, Boca Raton, Florida, USA, 79th edition, 1998.
- P. Pyykkö,personal communication, 1998, 204, 2008, 2010.