Proton states in 247Bk excited by 246Cm(α,t) reaction and 247Cf (electron capture) and 251Es (α) decays

Details Proton states in 247Bk excited by 246Cm(α,t) reaction and 247Cf (electron capture) and 251Es (α) decays Proton states in 247Bk excited by 246Cm(α,t) reaction and 247Cf (electron capture) and 251Es (α) decays

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979phrvc..20..290a&link_type=abstract

Physical Review C (Nuclear Physics), Volume 20, Issue 1, July 1979, pp.290-297

Physics

Nuclear Physics

5

Scientific paper

Proton states in 247Bk have been investigated by measuring the γ rays and conversion electrons associated with the electron capture decay of the 3.11-h 247Cf, 251Es α spectrum, and triton spectrum produced in the 246Cm(α,t)247Bk reaction. The γ-ray spectra were measured with a 25-cm3 coaxial Ge(Li) diode and the electron spectrum was measured with a cooled Si(Li) spectrometer. Multipolarities of the intense transitions in 247Bk were deduced and the ft values were derived from measured electron capture intensities. Triton spectra from the 246Cm(α,t) reaction at bombarding energies of 28.0 and 29.0 MeV were momentum analyzed with an Enge split-pole magnetic spectrograph. Spectroscopic factors were derived from the measured cross sections and were found to be in good agreement with respective values calculated with single-particle wave functions. The 251Es α spectrum was measured with the Argonne double-focussing magnetic spectrometer; five α groups were observed. On the basis of the results of the present investigation the following proton orbitals were identified in 247Bk: 32-[521], 0; 72+[633], 40.8; 52+[642], 334.9; 52-[523], 447.8; 1/2 + [400], 487; 1/2 - [521], 704; I=92,72-[514], 904 and I=132,92+[624],1166 keV. RADIOACTIVITY 247Cf [from 246Cm (α, 3n)]; measured Eγ, Iα, Ece, Ice, 251Es [from 249Cf (α,2n), 246Fm-->EC251Es] measured Eα, Iα deduced hindrance factors. NUCLEAR REACTIONS 246Cm(α,t), E=28.0, 29.0 MeV; measured E (excitation), σ. 247Bk deduced levels, ft (EC), γ multipolarity, I, π, eight single-particle states. Mass-separated 247Cf, 251Es, and 246Cm.

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