**ADOPTED LEVELS for ^{3}H**

__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)

Q(β-)=18.5906 keV 32 | S(n)= 6257.233 keV 2 | ||||

Reference: 2012WA38 |

References: | |||

A | ^{1}H(^{6}He,α) | B | ^{2}H(n,γ) E=THERMAL |

C | ^{2}H(n,n) | D | ^{3}H(γ,n),(γ,NN) |

E | ^{3}H(E,E) |

E(level) (keV) | XREF | J^{π}(level) | T_{1/2}(level) |

0.0 | AB | 1/2+ | 12.32 y 2 % β ^{-} = 100 |

__Additional Level Data and Comments__:

E(level) | J^{π}(level) | T_{1/2}(level) | Comments |

0.0 | 1/2+ | 12.32 y 2 % β ^{-} = 100 | μ=+2.978962467 26^{3}H binding energy: 8481.7986 keV 24; S(n)=6257.2327 keV 22 using mass excess values from (2012Wa38).E(level): ^{3}H binding energy: 8481.7986 keV 24; S(n)=6257.2327 keV 22 using mass excess values from (2012Wa38). |

The discovery of hydrogen isotope

^{3}H with an estimate of its mass was reported in 1934; see (2012Th01) for a historical review. In (1947Bl31,1947Bl32) it is shown that the spin of^{3}H is 1/2 and the ratio of the magnetic moment of^{3}H to that of the proton is found to be 1.0671. For the^{3}H spin, see also (1949Di31).Calculations show that the ground state wave functions of

^{3}H and^{3}He 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 |c

_{t}of the asymptotic d state to S state of^{3}H is -0.041831. This value is the inverse square of the uncertainty weighted average of the two most recent measurements (1993Ge04,1994Ko29). The following table lists references reporting values for |c_{t}:Also see (1988Fr01) where it was noted that there is a strong correlation between the triton and deuteron asymptotic ratios. Using several models, they obtained |c

_{t}/|c_{d}=1.684. Using this ratio value and |c_{d}=0.02564from (1990Ro02) gives |c_{t}=-0.043012.The charge and magnetic rms radii for

^{3}H are r_{c}=1.755 fm86and r_{m}=1.840 fm181(1994Am07). See (2005Go26) for electric and magnetic form factors for^{3}H and^{3}He as well as isoscalar and isovector versions and comparison with theory. Also see the reaction^{3}H(e,e)^{3}H below for more details.Triton magnetic moment, μ

_{t}=+2.97896246726μ_{N}. This value is obtained from a measurement of the ratio of the triton to proton magnetic moments μ_{t}/μ_{p}=1.066639915130(2011Ne15) and the value of the proton magnetic moment μ_{p}=+2.79284735623μ_{N}reported in (2014Ol01). Also see Table XLI of (2012Mo42) which gives μ_{t}=2.97896244838.