ADOPTED LEVELS for 3He
Authors: J.E. Purcell, C.G. Sheu | Citation: Nucl. Data Sheets 130 1 (2015) | Cutoff date: 30-Jun-2015
Full ENSDF file | Adopted Levels (PDF version)
| S(p)= 5493.477 keV 2 | |||||
| Reference: 2012WA38 |
| References: | |||
| A | 1H(6Li,α) | B | 2H(p,γ) |
| C | 2H(p,p),(p,n),1H(d,d),(d,n), | D | 3H β- decay |
| E | 3He(γ,p),3He(γ,n) | F | 3He(E,E) |
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) |
| 0.0 | AB D F | 1/2+ | STABLE |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | 1/2+ | STABLE | μ=-2.127625306 25 (2012Mo42) 3He binding energy: 7718.0428 keV 23; S(p)=5493.4768 keV 23 using mass excess values from (2012Wa38). |
The isotope 3He was probably first observed in 1933-34. See (2012Th01) and references therein. That 3He has spin 1/2 is reported in (1949Do24,1950Di11).
Calculations show that the ground state wave functions of 3H and 3He consist of a spatially symmetric S state (≈90%), a d state (≈9%), a mixed symmetry S’ state (≈1%) and a small p state (<0.1%). See (1979Sa15,1986Is01,1987Er07,1993Wu08,2002Ho09).
The ratio |ct of the asymptotic d state to S state of 3He is -0.0389 42. This value is the inverse square of the uncertainty weighted average of the two most recent measurements (1995Ay03,1997Ri07,1997Sc31).
The charge and magnetic rms radii for 3He are rc=1.959 fm 30 and rm=1.965 fm 153 (1994Am07). See (2005Go26) for electric and magnetic form factors for 3H and 3He as well as t=0, 1 form factors and comparison with theory. See the reaction 3He(e,e)3He below for more details.
The magnetic moment, μ=-2.127625306 25, is from Table XLI of (2012Mo42)