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New results of 116Cd double beta decay study with 116CdWO4 scintillators | | F.A. Danevich
; A.Sh. Georgadze
; V.V. Kobychev
; B.N. Kropivyansky
; A.S. Nikolaiko
; O.A. Ponkratenko
; V.I. Tretyak
; S.Yu. Zdesenko
; Yu.G. Zdesenko P.G. Bizzeti
; T.F. Fazzini
; P.R. Maurenzig
; | | Date: |
1 Mar 2000 | | Journal: | Phys.Rev. C62 (2000) 045501 | | Subject: | nucl-ex | | Affiliation: | Institute for Nuclear Research, Kiev, Ukraine) P.G. Bizzeti, T.F. Fazzini, P.R. Maurenzig (Dip. di Fisica, Universita di Firenze and INFN, Firenze, Italy | | Abstract: | A new phase of 116Cd double beta decay experiment is in progress in the Solotvina Underground Laboratory. Four enriched 116CdWO4 scintillators with total mass 339 g are used in a set up, whose active shield is made of 15 natural CdWO4 crystals (20.6 kg). The background rate in the energy interval 2.5-3.2 MeV is 0.03 counts/y*kg*keV. The half-life for 2-neutrino 2-beta decay of 116Cd is measured as T{1/2}(2-neutrino) = [2.6+-0.1(stat)-0.4+0.7}(syst)]*10**19 y. The T{1/2} limits for neutrinoless 2-beta decay of 116Cd are set as T{1/2} >= 0.7(2.5)*10**23 y at 90%(68%) C.L. for transition to ground state of 116Sn, while for decays to the first 2+ and second 0+ excited levels of 116Sn as T{1/2}>=1.3(4.8)*10**22 y and >=0.7(2.4)*10**22 y with 90%(68%) C.L., respectively. For 0-neutrino 2-beta decay with emission of one or two Majorons, the limits are T{1/2}(0-neutrino M1) >=3.7(5.8)*10**21 y and T{1/2}(0-neutrino M2)>=5.9(9.4)*10**20 y at 90%(68%) C.L. Restrictions on the value of the neutrino mass, right-handed admixtures in the weak interaction, and the neutrino-Majoron coupling constant are derived as: m(neutrino)<=2.6(1.4) eV, eta <=3.9*10**-8, lambda <=3.4*10**-6, and g{M}<= 12(9.5)*10**-5 at 90%(68%) C.L., respectively. | | Source: | arXiv, nucl-ex/0003001 | | Services: | Forum | Review | PDF | Favorites | |
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