First results on ~(76)Ge neutrinoless double beta decay from CDEX-1 experiment
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摘要
We report the first results on ~(76)Ge neutrinoless double beta decay from stage one of the China dark-matter experiment(CDEX).A p-type point-contact high-purity germanium detector with a mass of 994 g has been installed to detect neutrinoless double beta decay events, as well as to directly detect dark matter particles. An exposure of 304 kg d has been analyzed over a wide spectral band from 500 keV to 3 MeV. The average event rate obtained was about 0.012 counts per keV per kg per day over the 2.039 MeV energy range. The half-life of ~(76)Ge neutrinoless double beta decay derived based on this result is T~(0ν)1/2>6.4×10~(22) yr(90% C.L.). An upper limit on the effective Majorana-neutrino mass of 5.0 eV has been achieved.
We report the first results on ~(76)Ge neutrinoless double beta decay from stage one of the China dark-matter experiment(CDEX).A p-type point-contact high-purity germanium detector with a mass of 994 g has been installed to detect neutrinoless double beta decay events, as well as to directly detect dark matter particles. An exposure of 304 kg d has been analyzed over a wide spectral band from 500 keV to 3 MeV. The average event rate obtained was about 0.012 counts per keV per kg per day over the 2.039 MeV energy range. The half-life of ~(76)Ge neutrinoless double beta decay derived based on this result is T~(0ν)1/2>6.4×10~(22) yr(90% C.L.). An upper limit on the effective Majorana-neutrino mass of 5.0 eV has been achieved.
We report the first results on ~(76)Ge neutrinoless double beta decay from stage one of the China dark-matter experiment(CDEX).A p-type point-contact high-purity germanium detector with a mass of 994 g has been installed to detect neutrinoless double beta decay events, as well as to directly detect dark matter particles. An exposure of 304 kg d has been analyzed over a wide spectral band from 500 keV to 3 MeV. The average event rate obtained was about 0.012 counts per keV per kg per day over the 2.039 MeV energy range. The half-life of ~(76)Ge neutrinoless double beta decay derived based on this result is T~(0ν)1/2>6.4×10~(22) yr(90% C.L.). An upper limit on the effective Majorana-neutrino mass of 5.0 eV has been achieved.
引文
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3 Q.R.Ahmad,et al.(SNO Collaboration),Phys.Rev.Lett.89,011301(2002).
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6 T.Akiri,et al.(LBNE Collaboration),arXiv:1110.6249.
7 S.M.Bilenky,and C.Giunti,Mod.Phys.Lett.A 27,1230015(2012),arXiv:1203.5250.
8 M.Agostini,et al.(GERDA Collaboration),Phys.Rev.Lett.111,122503(2013),arXiv:1307.4720.
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16 C.E.Aalseth,et al.(IGEX Collaboration),Phys.Rev.C 59,2108(1999).
17 K.J.Kang,et al.(CDEX Collaboration),Front.Phys.8,412(2013),arXiv:1303.0601.
18 J.P.Cheng,S.Y.Wu,Q.Yue,and M.B.Shen,Physics 40,149(2011).
19 K.J.Kang,J.P.Cheng,Y.H.Chen,Y.J.Li,M.B.Shen,S.Y.Wu,and Q.Yue,J.Phys.-Conf.Ser.203,012028(2010).
20 K.J.Kang,et al.(CDEX Collaboration),Chin.Phys.C 37,126002(2013),arXiv:1305.0401.
21 W.Zhao,et al.(CDEX Collaboration),Phys.Rev.D 88,052004(2013),arXiv:1306.4135.
22 S.K.Liu,et al.(CDEX Collaboration),Phys.Rev.D 90,032003(2014),arXiv:1403.5421.
23 Q.Yue,et al.(CDEX Collaboration),Phys.Rev.D 90,091701(R)(2014),arXiv:1404.4946.
24 W.Zhao,et al.(CDEX Collaboration),Phys.Rev.D 93,092003(2016),arXiv:1601.04581.
25 S.K.Liu,et al.(CDEX Collaboration),arXiv:1610.07521.
26 Y.C.Wu,X.Q.Hao,Q.Yue,Y.J.Li,J.P.Cheng,K.J.Kang,Y.H.Chen,J.Li,J.M.Li,Y.L.Li,S.K.Liu,H.Ma,J.B.Ren,M.B.Shen,J.M.Wang,S.Y.Wu,T.Xue,N.Yi,X.H.Zeng,Z.Zeng,and Z.H.Zhu,Chin.Phys.C 37,086001(2013).
27 Z.Zeng,J.Su,H.Ma,H.Yi,J.Cheng,Q.Yue,J.Li,and H.Zhang,J.Radioanal.Nucl.Chem.301,443(2014).
28 Z.M.Zeng,H.Gong,Q.Yue,and J.M.Li,Nucl.Inst.Methods Phys.Res.Sect.A-Accel.Spect.Detectors Assoc.Equip.804,108(2015).
29 H.Jiang,Q.Yue,Y.L.Li,K.J.Kang,Y.J.Li,J.Li,S.T.Lin,S.K.Liu,H.Ma,J.L.Ma,J.Su,H.Tsz-King Wong,L.T.Yang,W.Zhao,and Z.Zeng,Chin.Phys.C 40,096001(2016),arXiv:1601.04305.
30 M.Agostini,et al.(GERDA Collaboration),J.Phys.G-Nucl.Part.Phys.40,035110(2013).
31 V.I.Tretyak,and Y.G.Zdesenko,Atomic Data Nucl.Data Tables 61,43(1995).
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33 F.Smkovic,V.Rodin,A.Faessler,and P.Vogel,Phys.Rev.C 87,045501(2013).
34 D.V.Forero,M.Tórtola,and J.W.F.Valle,Phys.Rev.D 86,073012(2012),arXiv:1205.4018.