Superdeformation in the newly discovered superheavy elements

doi:10.1016/S0375-9474(00)00689-8

Nuclear Physics A

Volume 689, Issues 3–4, 2 July 2001, Pages 691-706

https://doi.org/10.1016/S0375-9474(00)00689-8 Get rights and content

Abstract

The structures of newly discovered superheavy elements with the proton number $Z=110$ –112, 114, 116, 118 and of their $α$ -decay chain nuclei are investigated using the self-consistent relativistic mean-field (RMF) theory. Extensive calculations show that the experimental data on the $α$ -decay energies are well reproduced by the RMF theory. We find sometimes shape coexistence in superheavy nuclei and a superdeformed prolate configuration becomes the ground state of the new superheavy elements. The superdeformation could lead to a slightly deeper binding and give a longer lifetime for superheavy nuclei than expected. This may be a new mechanism for the appearance of the superheavy island. A systematic comparison with other models for the calculated binding energies and deformations is carried out, and predictions on the properties of unknown neighbouring superheavy nuclei are made for further comparison with future experiments.

References (39)

Y.K. Gambhir et al.
Ann. Phys. (NY)
(1990)
S. Marcos et al.
Nucl. Phys. A
(1992)
D. Hirata et al.
Phys. Lett. B
(1993)
Y. Sugahara et al.
Nucl. Phys. A
(1994)
Zhongzhou Ren et al.
Phys. Lett. B
(1996)
T.R. Werner et al.
Phys. Lett. B
(1994)
T.R. Werner et al.
Nucl. Phys. A
(1996)
Zhongzhou Ren et al.
Phys. Rev. C
(1996)
K. Rutz et al.
Phys. Rev. C
(1997)
S.K. Patra et al.
Nucl. Phys. A
(1999)
J. Meng, N. Takigawa, private communication and to be...

P. Moeller et al.

At. Data Nucl. Data Tables

(1997)

G. Audi et al.

Nucl. Phys. A

(1993)

R. Smolanczuk

Phys. Rev. C

(1999)

W. Pannert et al.

Phys. Rev. Lett.

(1987)

S. Hofmann

Z. Phys. A

(1995)

S. Hofmann

Z. Phys. A

(1995)

S. Hofmann

Z. Phys. A

(1996)

S. Hofmann

Rep. Prog. Phys.

(1998)

Y.T. Oganessian

Nature (London)

(1999)

Cited by (70)

A self-consistent mean-field study of Z = 120 nuclei and α-decay chains of <sup>292,298,299,300,304</sup>120 isotopes
2019, Chinese Journal of Physics
Citation Excerpt :
Interestingly, 292120 (with N = 172) and 304120 (with N = 184) are closed shell nuclei with predicted neutron magic numbers. Results obtained are consistent to the earlier theoretical calculations [50–56]. Some earlier and recent calculations based on the same formalism have quite well reproduced the experimental ground state quadrupole deformations [15–17,32–37,57,58].
A self-consistent mean-field investigation is done to test the model accuracy, model dependence, and the dependence on different model parameters in the study of superheavy nuclei. This is done within the self-consistent mean-field models-the Skyrme-Hartree-Fock-Bogoliubov (HFB), and the Relativistic-Hartree-Bogoliubov (RHB) with density-dependent couplings. A systematic comparison is made with experimental data, as well as with the macro-microscopic Finite Range Droplet Model(FRDM). The bulk ground state properties and the microscopic structure of Z=120 superheavy nuclei are investigated. Further investigation is made of α-decay series for the five isotopes ^{292,298,299,300,304}120 of Z=120 nuclei. A spontaneous fission investigation is done to account the number of α-decay before spontaneous fission starts. The experimental data available for α-decay energies and half-lives are produced reasonably. The RHB model with NL3* parameter set, and with ImSahu and UNIV2 formula to calculate the α-decay half-lives is found to be the best suited for accurately predicting the ground state properties and the α-decay half-lives of the superheavy nuclei.
Nuclear data sheets for A = 251-259 (odd)
2013, Nuclear Data Sheets
Stability of superheavy nuclei against α-decay and spontaneous fission
2013, Nuclear Physics A
The stability of superheavy nuclei is mainly determined by the competition between α-decay and spontaneous fission. We investigate the half-lives of both α-decay and spontaneous fission for the heaviest nuclei with proton numbers up to $Z = 121$ . The agreement between theoretical half-lives and available experimental data is fairly well for the superheavy nuclei. Enhanced stability against spontaneous fission is found for the $Z = 119$ and $Z = 120$ isotopic chains, which are of current experimental interests. α-Decay is predicted to be the dominating decay mode for the $Z = 119$ and $Z = 120$ isotopes with estimated half-lives ranging from microseconds to milliseconds.
Investigations on ground-state properties of deformed nuclei in relativistic mean field theory with parameter set FSUGold
2010, Nuclear Physics A
In this work, we have systemically investigated the ground-state properties of the rare-earth even–even nuclei with the parameter set FSUGold that includes the isoscalar–isovector coupling to soften the symmetry energy. It is the first time that this parameter set is applied to investigate the properties of deformed nuclei. The present study is mainly focused on the nuclei with the known experimental binding energies ranging from $Z = 58$ to $Z = 70$ . The calculated binding energies, quadrupole deformations, and charge radii are in good agreement with the available experimental data. It has been shown that the parameter set FSUGold is as successful as the NL3 in reproducing the known ground-state properties of deformed nuclei.
Ground state properties and bubble structure of synthesized superheavy nuclei
2013, International Journal of Modern Physics E
Properties of Z = 120 nuclei and the α-decay chains of the <sup>292, 304</sup>120 isotopes using relativistic and nonrelativistic formalisms
2012, International Journal of Modern Physics E

View all citing articles on Scopus

View full text

Superdeformation in the newly discovered superheavy elements

Abstract

Ann. Phys. (NY)

Nucl. Phys. A

Phys. Lett. B

Nucl. Phys. A

Phys. Lett. B

Phys. Lett. B

Nucl. Phys. A

Phys. Rev. C

Phys. Rev. C

Nucl. Phys. A

At. Data Nucl. Data Tables

Nucl. Phys. A

Phys. Rev. C

Phys. Rev. Lett.

Z. Phys. A

Z. Phys. A

Z. Phys. A

Rep. Prog. Phys.

Nature (London)