Phys.Rev. C 104, 064604 (2021)

K.P.Santhosh, T.Jose

Theoretical investigation on double-α decay from radioactive nuclei

RADIOACTIVITY ^219,220Ac, ^220,221Th, ²²²Pa(2α), (⁸Be); calculated Q(2α), T_1/2. ^{144,145,146,148}Nd, ^147,148,149, ^150,152Sm, ^151,153Eu, ^{152,154,155,156}Gd, ^156,158,160Dy, ^{162,164,166,167,168}Er, ¹⁶⁹Tm, ^{168,170,171,172,173,174,176}Yb, ^175,176Lu, ^{174,176,177,178,179,180}Hf, ^180,181Ta, ^{180,182,183,184,186}W, ^185,187Re, ^{184,186,187,188,189,190,192}Os, ^191,193Ir, ^{190,192,194,195,196}Pt, ¹⁹⁷Au, ^{196,198,199,200,201,202}Hg, ²⁰³Tl, ^{204,206,207,208}Pb, ²⁰⁹Bi, ²³²Th, ²³¹Pa, ^234,235,238U(2α); calculated Q(2α), T_1/2 for nuclides in the naturally occuring isotopic composition of elements, with and without deformation effects. ²¹⁵At, ^{194,210,211,215,216,217,218}Rn, ^{209,210,211,215,216,217,218,219}Fr, ^{209,210,211,216,217,218,219,220}Ra, ^{209,210,211,217,218,219,220,221}Ac, ^{211,218,219,220,221,222}Th, ^{218,219,220,221,222,223}Pa, ^{219,220,221,222,223,224}U, ^{220,221,222,223,224,225,226}Np; calculated Q(2α), T_1/2. ^{191,192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226}At, ^{193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228}Rn, ^{197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232}Fr, ^{208,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239}Th, ^{212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,240,241}Pa, ^{201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235}Ra, ^{205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,237}Ac, ^{215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,240,241,242,243}U, ^{219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,240,241,242,243,244,245}Np(2α); ^{191,192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226}At(⁸Be); calculated Q(2α), T_1/2 with and without the deformation effects. ^200,203Os, ^208,212Hg, ^206,208Tl, ^{204,206,208,210}Pb, ^208,209Bi, ^212,216Po, ^216,220Ra, ²⁶⁶Hs, ^280,286,288Cn; calculated shell correction energies and compared with theoretical values from three other methods in literature. Calculations used modified generalized liquid drop model (MGLDM), and Coulomb and proximity potential model (CPPM) with different preformation factors for double α decay. Comparison with available values reported in 2021Tr07: Nucl. Phys. Atom. Energy 22, p.121 (2021).

doi: 10.1103/PhysRevC.104.064604