Quest for two-proton radioactivity

Deepika Pathak; Pardeep Singh; Hiteshwar Parshad; Harjeet Kaur; Sudhir R. Jain

doi:10.1140/epjp/s13360-022-02354-x

EPJ

Quest for two-proton radioactivity

Deepika Pathak¹, Pardeep Singh², Hiteshwar Parshad¹, Harjeet Kaur¹^d and Sudhir R. Jain³^,4^,5

¹ Department of Physics, Guru Nanak Dev University, 143 005, Amritsar, India
² Swami Swatantranand Memorial College, 143 531, Dinanagar, India
³ Nuclear Physics Division, Bhabha Atomic Research Centre, 400 085, Mumbai, India
⁴ Homi Bhabha National Institute, Training School Complex, 400 094, Mumbai, India
⁵ UM-DAE Centre for Excellence in Basic Sciences, 400 098, Mumbai, India

Received: 2 November 2021
Accepted: 5 January 2022
Published online: 25 February 2022

Abstract

Two-proton emission half-lives (

T_{1 / 2}^{2 p}

$T_{1/2}^{2p}$ values) of nuclei are determined employing the interaction potential involving Coulomb and proximity potentials. We compare

T_{1 / 2}^{2 p}

$T_{1/2}^{2p}$ values with those calculated using the empirical method, and to assess the precision of the present model in reproducing the experimental half-lives, a comparison is made with experimental ones as well. In light and medium mass region, we have reported few nuclei, viz.

^{22}

$^{22}$ Si,

^{26}

$^{26}$ S,

^{30}

$^{30}$ Ar,

^{34}

$^{34}$ Ca,

^{36, 38}

$^{36,38}$ Ti,

^{40, 42}

$^{40,42}$ Cr,

^{52}

$^{52}$ Zn,

^{58, 60}

$^{58,60}$ Ge,

^{62}

$^{62}$ Se and

^{64, 66, 68}

$^{64,66,68}$ Kr, as two-proton emitters. Moreover, such radioactivity in

^{60}

$^{60}$ Ge and

^{68}

$^{68}$ Kr nuclei can be identified experimentally. However, we require disintegration energy (

Q_{2 p}

$Q_{2p}$ values) as an input in order to predict the

T_{1 / 2}^{2 p}

$T_{1/2}^{2p}$ values of experimentally unknown even–even superheavy nuclei (SHN), and employing periodic orbit theory within microscopic–macroscopic formalism, we have calculated

Q_{2 p}

$Q_{2p}$ values of these nuclei whose atomic number lies between 118 and 126. Subsequently, we determine the logarithmic values of

T_{1 / 2}^{2 p}

$T_{1/2}^{2p}$ ’s for even–even unknown SHN and compare the obtained results with those calculated exploiting the empirical method. Also, the study of spontaneous fission half-lives,

α

$\alpha$ -decay half-lives and branching ratios leads us to establish that no signatures of two-proton radioactivity exist in the superheavy region. We believe that such predictions may help in the experimental identification of 2p-radioactivity in the laboratory.

15th European Conference on Atoms Molecules and Photons (ECAMP)
June 30 to July 4, 2025
Innsbruck, Austria

EPJ

Quest for two-proton radioactivity

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