Limits on the Majorana neutrino mass and right-handed weak currents by neutrinoless double $β$ decay of $^{100} Mo$

Spectroscopic studies of neutrinoless double beta decays

(0 ν β β)

from

^{100} Mo

were made by means of ELEGANT V. The most stringent limits on the

0 ν β β

half-lives were obtained for the ground state transitions

T_{1 / 2}^{0 ν} {(m}_{ν}) > 5.5 (10.3) \times 10^{22},

T_{1 / 2}^{0 ν} (λ) > 4.2 (8.5) \times 10^{22},

and

T_{1 / 2}^{0 ν} (η) > 4.9 (9.3) \times 10^{22} yr,

with 90(68)% C.L., for the mass term

〈 m_{ν} 〉

and for the right-handed weak current terms of

〈 λ 〉

and

〈 η 〉,

respectively. Using the nuclear matrix elements of the QRPA calculation by Tomoda et al., these limits lead to upper limits of

〈 m_{ν} 〉 < 2.1 (1.5) eV,

〈 λ 〉 < 3.2 (2.5) \times 10^{- 6},

and

〈 η 〉 < 2.4 (1.9) \times 10^{- 8}

with 90(68)% C.L. Limits on other terms beyond the standard theory are also discussed.

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Limits on the Majorana neutrino mass and right-handed weak currents by neutrinoless doubleβdecay of100Mo