skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Possibility of synthesizing a doubly magic superheavy nucleus

Abstract

The possibility of synthesizing a doubly magic superheavy nucleus, {sup 298}114{sub 184}, is investigated on the basis of fluctuation-dissipation dynamics. In order to synthesize this nucleus, we must generate more neutron-rich compound nuclei because of the neutron emissions from excited compound nuclei. The compound nucleus {sup 304}114 has two advantages to achieving a high survival probability. First, because of low neutron separation energy and rapid cooling, the shell correction energy recovers quickly. Secondly, owing to neutron emissions, the neutron number in the nucleus approaches that of the double closed shell and the nucleus attains a large fission barrier. Because of these two effects, the survival probability of {sup 304}114 does not decrease until the excitation energy E{sup *}=50 MeV. These properties lead to a rather high evaporation residue cross section.

Authors:
 [1]
  1. Flerov Laboratory of Nuclear Reactions, JINR, Dubna (Russian Federation)
Publication Date:
OSTI Identifier:
20991015
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevC.75.024602; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; COMPOUND NUCLEI; CROSS SECTIONS; EVAPORATION; EXCITATION; FISSION BARRIER; FLUCTUATIONS; MEV RANGE 10-100; NEUTRON EMISSION; NEUTRON SEPARATION ENERGY; NEUTRONS; NUCLEI; PROBABILITY

Citation Formats

Aritomo, Y. Possibility of synthesizing a doubly magic superheavy nucleus. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.024602.
Aritomo, Y. Possibility of synthesizing a doubly magic superheavy nucleus. United States. doi:10.1103/PHYSREVC.75.024602.
Aritomo, Y. Thu . "Possibility of synthesizing a doubly magic superheavy nucleus". United States. doi:10.1103/PHYSREVC.75.024602.
@article{osti_20991015,
title = {Possibility of synthesizing a doubly magic superheavy nucleus},
author = {Aritomo, Y.},
abstractNote = {The possibility of synthesizing a doubly magic superheavy nucleus, {sup 298}114{sub 184}, is investigated on the basis of fluctuation-dissipation dynamics. In order to synthesize this nucleus, we must generate more neutron-rich compound nuclei because of the neutron emissions from excited compound nuclei. The compound nucleus {sup 304}114 has two advantages to achieving a high survival probability. First, because of low neutron separation energy and rapid cooling, the shell correction energy recovers quickly. Secondly, owing to neutron emissions, the neutron number in the nucleus approaches that of the double closed shell and the nucleus attains a large fission barrier. Because of these two effects, the survival probability of {sup 304}114 does not decrease until the excitation energy E{sup *}=50 MeV. These properties lead to a rather high evaporation residue cross section.},
doi = {10.1103/PHYSREVC.75.024602},
journal = {Physical Review. C, Nuclear Physics},
number = 2,
volume = 75,
place = {United States},
year = {Thu Feb 15 00:00:00 EST 2007},
month = {Thu Feb 15 00:00:00 EST 2007}
}
  • In a recent paper, Aritomo discusses the possibility of forming a doubly magic superheavy nucleus using reactions with radioactive beams. I point out the suggested reactions have negligible rates.
  • The possible formation of weakly excited compound nuclei in the sub-barrier complete fusion of an ion with a target nucleus is considered as a method of synthesizing heavy and superheavy elements. The experimental cross sections of the reactions (HI,1n) and (HI,2n) are analyzed for the purpose of obtaining information on nuclear fusion. The value of the shift between the effective fusion and inelastic-interaction barriers is determined. Reactions of heavy and superheavy element synthesis accompanied by the emission of a small number of neutrons from weakly excited compound nuclei are selected.
  • The α-decay and spontaneous fission (SF) half-lives of nuclei around 270Hs are calculated with formulas derived from an in-depth analysis of the available experimental data and from theoretical models. The parameters of these formulas result from the fit of half-lives with respect to the reaction energies Q{sub α}, the height of the SF barrier B{sub f} and the fissionability Z{sup 2}/A. The calculated partial and total half-lives are compared with the experimental data and the results of other approximations. Half-life predictions are made for many unknown nuclei.
  • A discrete superdeformed rotational band has been discovered in [sup 144]Gd following the reaction [sup 100]Mo([sup 48]Ti, 4[ital n])[sup 144]Gd at 221 MeV. The dynamical moment of inertia shows a sharp irregularity at [h bar][omega]=0.45 MeV. The intensity of the [gamma]-ray transitions suggests that the irregularity can be associated with a backbend, which is interpreted in terms of the [ital N]=6 proton band crossing. The experimental results are in good agreement with cranked mean field calculations, which indicate the presence of large shell gaps for both protons and neutrons.