Lifetime measurements in {sup 197}Pb

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Bulletin of the American Physical Society

OSTI ID:243912

Hughes, J R; Becker, J A; Brinkman, M J ^[1]

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1. Lawrence Livermore National Lab., CA (United States); and others

Lifetimes of states in the regular and irregular {Delta}I = 1 bands in {sup 197}Pb have been measured using the Doppler-shift attenuation method. Excited states in {sup 197}Pb were populated using the {sup 154}Sm({sup 48}Ca,5n) reaction at a beam energy of 210 MeV, with 1 mg/cm{sup 2} target on a 10 mg/cm{sup 2} Au backing. In-beam {gamma}rays were measured with the HERA spectrometer at the LBL 88-Inch Cyclotron facility. {Delta}I = 1 {gamma}-rays in the energy range 300 < E{sub {gamma}} < 500 keV in the regular band showed lineshapes consistent with lifetimes of the same order as the stopping of the recoil in the backing. Preliminary lineshape analysis of the data indicate that the lifetimes of the {Delta}I = 1 transitions are similar to those found recently in similar structures in {sup 198}Pb. The measured lifetimes support the suggested collective nature of these bands.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 243912
• Report Number(s): CONF-9304297--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 2 Vol. 38; ISSN 0003-0503; ISSN BAPSA6
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CALCIUM 48 REACTIONS
EXCITED STATES
LEAD 197
LIFETIME
MEV RANGE 100-1000
NEUTRONS
SAMARIUM 154 TARGET