In-beam gamma ray and conversion electron study of {sup 250}Fm

We report on a set of in-beam studies of excited states in {sup 250}Fm. We detected prompt {gamma} rays by using the JUROSPHERE IV array and conversion electrons by using the SACRED spectrometer. Both devices were used in conjunction with the RITU gas-filled recoil separator located at the Universit...

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Bibliographic Details
Published in:Physical review. C, Nuclear physics Nuclear physics, 2006-02, Vol.73 (2)
Main Authors: Bastin, J.E., Herzberg, R.-D., Butler, P.A., Jones, G.D., Page, R.D., Jenkins, D.G., Amzal, N., Brew, P.M.T., Hammond, N.J., Humphreys, R.D., Ikin, P.J.C., Page, T., Greenlees, P.T., Jones, P.M., Julin, R., Juutinen, S., Kankaanpaeae, H., Keenan, A., Kettunen, H., Kuusiniemi, P.
Format: Article
Language:English
Subjects:
CALCIUM 48 REACTIONS
E2-TRANSITIONS
ELECTRON SPECTRA
ELECTRON SPECTROSCOPY
ELECTRONS
EVAPORATION MODEL
EXCITATION FUNCTIONS
FERMIUM 250
GAMMA RADIATION
GAMMA SPECTRA
GROUND STATES
HALF-LIFE
INTERNAL CONVERSION
MERCURY 204 TARGET
MEV RANGE
NUCLEAR DEFORMATION
NUCLEAR PHYSICS AND RADIATION PHYSICS
QUADRUPOLES
ROTATIONAL STATES
SPIN
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Summary:We report on a set of in-beam studies of excited states in {sup 250}Fm. We detected prompt {gamma} rays by using the JUROSPHERE IV array and conversion electrons by using the SACRED spectrometer. Both devices were used in conjunction with the RITU gas-filled recoil separator located at the University of Jyvaeskylae. {sup 250}Fm nuclei were produced through the {sup 204}Hg({sup 48}Ca,2n){sup 250}Fm fusion-evaporation reaction. An experimental excitation function gave a maximum reaction cross section of (980 {+-} 160) nb at an energy of 209 MeV in the center of the target. Tagging techniques were employed, and a number of E2 transitions were observed that connected the ground-state band levels from spin 4{sup +} up to 18{sup +}. The highly converted 4{sup +}{yields}2{sup +} transition is observed only by use of conversion electron spectroscopy. The observed ground-state band transitions indicate a rotational structure. We deduce a quadrupole deformation parameter of {beta}{sub 2}=0.28 {+-} 0.02. A low-energy background of apparent nuclear origin is observed in conversion electrons and postulated to arise from the decay of high-K bands. The half-life of {sup 250}Fm is measured to be 30.4 {+-} 1.5 0009m.
ISSN:0556-2813
1089-490X
DOI:10.1103/PhysRevC.73.024308