Search for stable octupole deformation in the nucleus /sup 225/Fr

Conference · Thu Dec 10 00:00:00 EST 1987 · AIP Conf. Proc.; (United States)

OSTI ID:5337158

Burke, D G; Kurcewicz, W; Loevhoeiden, G; Nyboe, K; Thorsteinsen, T F; Gietz, H; Kaffrell, N; Rogowski, J; Naumann, R A; Borge, M J.G.; others, and

The level structure of /sup 225/Fr has been studied from the /sup 225/Rn(..beta../sup -/) decay in on-line experiments at the ISOLDE facility. A level scheme was constructed on the basis of gamma--gamma coincidence data, and the multipolarities of many transitions were established by conversion electron measurements. Levels in /sup 225/Fr were also studied with the /sup 226/Ra(t,..cap alpha..)/sup 225/Fr reaction at the McMaster University Accelerator Laboratory, using a target of /sup 226/Ra(T/sub 1/2/ = 1600y) and a magnetic spectrograph to analyze the alpha spectra. The first three excited states, at 28.5, 82.5 and 128.2 keV, are interpreted as rotational band members based on the ground state, which is known to have I = 3/2. The (t,..cap alpha..) strengths to these levels indicate a 3/2/sup -/(532) assignment to the ground state. No evidence for an octupole deformation in /sup 225/Fr has been found so far, although analysis of data for other excited states is continuing.

• Research Organization: Dept. of Physics, McMaster Univ., Hamilton, Ontario, Canada L8S 4K1
• OSTI ID: 5337158
• Report Number(s): CONF-870970-; TRN: 88-012614
• Journal Information: AIP Conf. Proc.; (United States), Vol. 164:1; Conference: 5. international conference on nuclei far from stability, Lake Rosseau, Canada, 14 Sep 1987
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
FRANCIUM 225
ENERGY LEVELS
PROTON REACTIONS
SPALLATION
SPALLATION FRAGMENTS
RADIUM 226 TARGET
TRITON REACTIONS
RADON 225
BETA-MINUS DECAY
PICKUP REACTIONS
ALPHA SPECTRA
BEAM SEPARATORS
ELECTRON SPECTRA
GAMMA SPECTRA
MEV RANGE 10-100
MEV RANGE 100-1000
NUCLEAR DEFORMATION
ROTATIONAL STATES
SINGLE-PARTICLE MODES
ALKALI METAL ISOTOPES
BARYON REACTIONS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
DECAY
DEFORMATION
DIRECT REACTIONS
ENERGY RANGE
EVEN-ODD NUCLEI
EXCITED STATES
FRANCIUM ISOTOPES
HADRON REACTIONS
HEAVY NUCLEI
ISOTOPES
MEV RANGE
MINUTES LIVING RADIOISOTOPES
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
ODD-EVEN NUCLEI
OSCILLATION MODES
RADIOISOTOPES
RADON ISOTOPES
SPECTRA
TARGETS
TRANSFER REACTIONS
652020* - Nuclear Properties & Reactions
A=220 & above
Experimental