THE NEUTRINOLESS DOUBLE BETA-DECAY OF GE-76, SE-82, KR-86, CD-114, TE-128,TE-130 AND XE-134,XE-136 IN THE FRAMEWORK OF A RELATIVISTIC QUARK CONFINEMENT MODEL

被引:70
作者
SUHONEN, J
KHADKIKAR, SB
FAESSLER, A
机构
[1] PHYS RES LAB,AHMEDABAD 380009,GUJARAT,INDIA
[2] UNIV TUBINGEN,INST THEORET PHYS,W-7400 TUBINGEN 1,GERMANY
关键词
D O I
10.1016/0375-9474(91)90474-K
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
The half-life of the 0+ --> 0+ neutrinoless double beta decay is calculated for Ge-76, Se-82, Kr-86, Cd-114, Te-128, Te-130 and Xe-134, Xe-136 and the upper limit for the effective neutrino mass of 3.0 eV is deduced from available experimental data. In addition, the contribution of the right-handed charged weak currents to the effective weak hamiltonian is estimated. The relevant parameters attain the values \<lambda>\ < 4.1 x 10(-6) and \<eta>\ < 6.6 x 10(-8). The nucleonic weak current is treated starting from the current quark level and evaluating the quark current using relativistic quark wave functions obtained from a Dirac equation with a harmonic confinement potential. The nuclear matrix elements of the thus obtained effective weak operators are evaluated using the proton-neutron quasi-particle random phase approximation approach avoiding the use of closure and the accompanying singular neutrino potentials. The dependence of the decay half-life on the recoil effects and the p-wave contribution is analyzed. Detailed presentation of the theory is pursued.
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页码:509 / 547
页数:39
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