Eur. Phys. J. A (2007) 31: 23-28
https://doi.org/10.1140/epja/i2006-10168-7

Regular Article - Nuclear Structure and Reactions

Super-allowed α decay above doubly-magic ¹⁰⁰Sn and properties of ¹⁰⁴Te = ¹⁰⁰Sn ⊗ α

Diakoniekrankenhaus, D-74523, Schwäbisch Hall, Germany

^* e-mail: WidmaierMohr@compuserve.de

Received: 15 November 2006
Accepted: 20 December 2006
Published online: 25 January 2007

Abstract

α-decay half-lives for ^{104, 105, 106}Te and ^{108, 109, 110}Xe close above the doubly-magic ¹⁰⁰Sn are calculated from systematic double-folding potentials. The derived α preformation factors are compared to results for ^{212, 213, 214}Po and ^{216, 217, 218}Rn above the doubly-magic ²⁰⁸Pb. α-decay energies of Q _α = 5.42±0.07MeV and 4.65±0.15MeV are predicted for ¹⁰⁴Te and ¹⁰⁸Xe; the corresponding half-lives are T _1/2 ≈ 5ns for ¹⁰⁴Te and of the order of 60μs for ¹⁰⁸Xe. Additionally, the properties of rotational bands in ¹⁰⁴Te are analyzed, and the first excited 2⁺ state in ¹⁰⁴Te is predicted at E _x = 650±40keV; it decays preferentially by γ emission with a reduced transition strength of 10 Weisskopf units to the ground state of ¹⁰⁴Te and with a minor branch by α emission to the ground state of ¹⁰⁰Sn.