Carbon radioactivity of 221Fr and 221Ra and the hindered decay of exotic odd-A emitters

doi:10.1016/0375-9474(94)90736-6

Nuclear Physics A

Volume 576, Issue 1, 22 August 1994, Pages 21-28

https://doi.org/10.1016/0375-9474(94)90736-6 Get rights and content

Abstract

By using glass detectors in 4π geometry we measured the spontaneous emission of carbon clusters from two sources of ²²¹Fr and ²²¹(Ra + Fr) produced at the on-line mass-separator ISOLDE at CERN, and obtained branching ratios λ_cl/λ_α = (8.79 ± 1.14) × 10⁻¹³ and (1.15 ± 0.91) × 10⁻¹² for ²²¹Fr and ²²¹Ra respectively. Such results exhibit a one-order-of-magnitude hindrance in respect to even-even father nuclei having the same penetrability for ¹⁴C emission.

References (13)

R. Bonetti et al.
Nucl. Phys.
(1993)
H.J. Rose et al.
Nature
(1984)
M. Hussonnois et al.
Phys. Rev.
(1990)
M. Hussonnois et al.
Phys. Rev
(1991)
E. Hourani et al.
Phys. Rev.
(1991)
P.B. Price et al.
Phys. Rev.
(1992)

There are more references available in the full text version of this article.

Cited by (26)

Cluster radioactivity in platinum isotopes
2023, Nuclear and Particle Physics Proceedings
We studied the cluster radioactivity in Platinum isotopes using different proximity potentials in the Coulomb Proximity Potential Model (CPPM). Cluster decay with cluster nuclei like ⁸Be and ¹²C from different Platinum isotopes are considered. Logarithmic values of half-life are calculated using CPPM with different proximity potentials and compared with the half-life from the Universal Decay Law (UDL).
Heavy particle radioactivity of superheavy element Z = 126
2021, Nuclear Physics A
The concept of heavy particle radioactivity is studied using modified generalised liquid drop model (MGLDM) in the superheavy element Z = 126. The eight different proximity functions and different mass excess values were used to evaluate cluster/HPR. The logarithmic half-lives using different proximity functions and mass excess values are compared with that of experiments. The HPR of ⁶⁰Ni to ¹⁰²Ru have been studied in the superheavy region ${}^{306}126$ to ${}^{326}126$ . The HPR half-lives has been compared with the different decay modes such as α-decay, β-decay and spontaneous fission. 9 HPR emitters, 4 α emitters, 1 $β^{+}$ emitter and 7 spontaneous fission nuclei were identified in the superheavy nuclei ${}^{306 - 314}126$ , ${}^{315 - 318}126$ , ${}^{319}126$ and ${}^{320 - 326}126$ respectively.
Clusters decay half-live of various heavy deformed nuclei with mass numbers in the range 221 ≤ A ≤ 242
2020, Chinese Journal of Physics
Decay half-live of several clusters between ¹⁴C and ³⁴Si emitted from various heavy deformed nuclei with mass numbers in the range 221 ≤ A ≤ 242 are calculated using nuclear Woods-Saxon (V_N(r, θ)), Coulomb (V_C(r, θ)) and rotational (V_l(r)) potentials considering deformation for both daughter and cluster and spherical configuration for them. Half-live of these decays are also obtained using a semi-empirical formula. Obtained results considering deformation are compared with the half-live of spherical configuration, results of a semi-empirical formula as well as the available experimental data. The comparison indicates that the calculated half-lives considering deformation are better agreed with the experimental data than the results of spherical configuration and the out put of semi-empirical formula. Also, The obtained results using deformation is better confirmed the Geiger-Nuttall low of alpha decay, especially for emission of light clusters as expected.
Cluster formation probability in the trans-tin and trans-lead nuclei
2010, Nuclear Physics A
Within our fission model, the Coulomb and proximity potential model (CPPM) cluster formation probabilities are calculated for different clusters ranging from carbon to silicon for the parents in the trans-tin and trans-lead regions. It is found that in trans-tin region the ¹²C, ¹⁶O, ²⁰Ne and ²⁴Mg clusters have maximum cluster formation probability and lowest half lives as compared to other clusters. In trans-lead region the ¹⁴C, ^18,20O, ²³F, ^24,26Ne, ^28,30Mg and ³⁴Si clusters have the maximum cluster formation probability and minimum half life, which show that alpha like clusters are most probable for emission from trans-tin region while non-alpha clusters are probable from trans-lead region. These results stress the role of neutron proton symmetry and asymmetry of daughter nuclei in these two cases.
Nuclear Data Sheets for A = 221
2007, Nuclear Data Sheets
The 1990 Nuclear Data Sheets for A = 221 mass chain (1990Ak05) have been updated on the basis of the experimental results from various reaction and decay studies leading to nuclides in the A = 221 (Z = 85 to 92) since July 1990 (cutoff date of the last evaluation). The results obtained from various theoretical studies are given as comments. The updated level schemes and decay schemes, and experimental decay and reaction data on which they are based, are summarized and presented for all nuclides with mass number A = 221. The adopted values of level energies, level spins and parities are given, and γ-ray energies, γ-ray intensities, as well as other nuclear properties are presented. The references, Jπ arguments, and necessary comments are given in the text. New measurements have been reported in Rn,Fr,Ra, and Ac and one new nuclide (²²¹U) has been given. All Q values have been adopted from 2003Au03.
Cluster radioactivity and very asymmetric fission through compact and creviced shapes
1998, Nuclear Physics A
The decay of radioactive nuclei which emit heavy clusters such as C, O, Ne, Mg and Si has been studied in the fission valley which leads one spherical nucleus towards two spherical touching nuclei before crossing the barrier. Assuming volume conservation, the macroscopic deformation energy has been calculated within a generalized liquid-drop model taking into account the proximity effects between the cluster and the daughter nucleus. The microscopic corrections have been introduced empirically to reproduce the experimental $Q$ values. The theoretical partial half-lives obtained within the WKB barrier penetration probability are in good agreement with the experimental data. The C, O, Ne, Mg and Si emission looks like a spontaneous fission through very asymmetric compact and creviced shapes formed at the early stage of the tunneling process.

View all citing articles on Scopus

View full text

Carbon radioactivity of 221Fr and 221Ra and the hindered decay of exotic odd-A emitters

Abstract

Nucl. Phys.

Nature

Phys. Rev.

Phys. Rev

Phys. Rev.

Phys. Rev.

Carbon radioactivity of ²²¹Fr and ²²¹Ra and the hindered decay of exotic odd-A emitters