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

Title: {alpha} decay studies of the nuclides {sup 218}U and {sup 219}U

Abstract

Very neutron deficient uranium isotopes were produced in fusion evaporation reactions using {sup 40}Ar ions on {sup 182}W targets. The gas-filled recoil separator RITU was employed to collect the fusion products and to separate them from the scattered beam and other reaction products. The activities were implanted into a position sensitive silicon detector after passing through a gas-counter system. The isotopes were identified using spatial and time correlations between the implants and the decays. Two {alpha}-decaying states, with E{sub {alpha}}=(8612{+-}9) keV and T{sub 1/2}=(0.51{sub -0.10}{sup +0.17}) ms for the ground state and E{sub {alpha}}=(10678{+-}17) keV and T{sub 1/2}=(0.56{sub -0.14}{sup +0.26}) ms for an isomeric state, were identified in {sup 218}U. In addition, the half-life and {alpha}-decay energy of {sup 219}U were measured with improved precision. The measured decay properties deduced for {sup 218}U suggest that there is no subshell closure at Z=92.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1];  [2]
  1. Department of Physics, University of Jyvaeskylae, P. O. Box 35, FI-40014 Jyvaeskylae (Finland)
  2. Department of Physics, University of Copenhagen, Copenhagen (Denmark)
Publication Date:
OSTI Identifier:
20995269
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevC.75.054307; (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; ACCURACY; ALPHA DECAY; ARGON 40; EVAPORATION; GROUND STATES; HEAVY ION REACTIONS; IONS; KEV RANGE; MASS NUMBER; NEUTRONS; SI SEMICONDUCTOR DETECTORS; TUNGSTEN 182 TARGET; URANIUM 218; URANIUM 219

Citation Formats

Leppaenen, A. P., Uusitalo, J., Leino, M., Eeckhaudt, S., Grahn, T., Greenlees, P. T., Jones, P., Julin, R., Juutinen, S., Kettunen, H., Kuusiniemi, P., Nieminen, P., Pakarinen, J., Rahkila, P., Scholey, C., and Sletten, G.. {alpha} decay studies of the nuclides {sup 218}U and {sup 219}U. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.054307.
Leppaenen, A. P., Uusitalo, J., Leino, M., Eeckhaudt, S., Grahn, T., Greenlees, P. T., Jones, P., Julin, R., Juutinen, S., Kettunen, H., Kuusiniemi, P., Nieminen, P., Pakarinen, J., Rahkila, P., Scholey, C., & Sletten, G.. {alpha} decay studies of the nuclides {sup 218}U and {sup 219}U. United States. doi:10.1103/PHYSREVC.75.054307.
Leppaenen, A. P., Uusitalo, J., Leino, M., Eeckhaudt, S., Grahn, T., Greenlees, P. T., Jones, P., Julin, R., Juutinen, S., Kettunen, H., Kuusiniemi, P., Nieminen, P., Pakarinen, J., Rahkila, P., Scholey, C., and Sletten, G.. Tue . "{alpha} decay studies of the nuclides {sup 218}U and {sup 219}U". United States. doi:10.1103/PHYSREVC.75.054307.
@article{osti_20995269,
title = {{alpha} decay studies of the nuclides {sup 218}U and {sup 219}U},
author = {Leppaenen, A. P. and Uusitalo, J. and Leino, M. and Eeckhaudt, S. and Grahn, T. and Greenlees, P. T. and Jones, P. and Julin, R. and Juutinen, S. and Kettunen, H. and Kuusiniemi, P. and Nieminen, P. and Pakarinen, J. and Rahkila, P. and Scholey, C. and Sletten, G.},
abstractNote = {Very neutron deficient uranium isotopes were produced in fusion evaporation reactions using {sup 40}Ar ions on {sup 182}W targets. The gas-filled recoil separator RITU was employed to collect the fusion products and to separate them from the scattered beam and other reaction products. The activities were implanted into a position sensitive silicon detector after passing through a gas-counter system. The isotopes were identified using spatial and time correlations between the implants and the decays. Two {alpha}-decaying states, with E{sub {alpha}}=(8612{+-}9) keV and T{sub 1/2}=(0.51{sub -0.10}{sup +0.17}) ms for the ground state and E{sub {alpha}}=(10678{+-}17) keV and T{sub 1/2}=(0.56{sub -0.14}{sup +0.26}) ms for an isomeric state, were identified in {sup 218}U. In addition, the half-life and {alpha}-decay energy of {sup 219}U were measured with improved precision. The measured decay properties deduced for {sup 218}U suggest that there is no subshell closure at Z=92.},
doi = {10.1103/PHYSREVC.75.054307},
journal = {Physical Review. C, Nuclear Physics},
number = 5,
volume = 75,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}