Proton states in the Z=99 nucleus 251Es excited by 251Fm electron capture decay and 250Cf(α,t) reaction

Details Proton states in the Z=99 nucleus 251Es excited by 251Fm electron capture decay and 250Cf(α,t) reaction Proton states in the Z=99 nucleus 251Es excited by 251Fm electron capture decay and 250Cf(α,t) reaction

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978phrvc..17.2163a&link_type=abstract

Physical Review C (Nuclear Physics), Volume 17, Issue 6, June 1978, pp.2163-2175

Physics

Nuclear Physics

14

Scientific paper

Level structure of the Z=99 nucleus, 251Es, has been investigated by measuring the γ rays and conversion electrons associated with the electron capture decay of 5.3-h 251Fm, and from triton spectra produced in the 250Cf(α,t)251Es reaction. The γ-ray spectra were measured with a 2-cm2 × 5-mm planar and a 25-cm3 coaxial Ge(Li) detector and the electron spectra were measured with a cooled Si(Li) detector. Fortyfive γ rays were identified in 251Es and the multipolarities of most of the transitions were deduced. Logft values for the observed electron capture transitions were derived from the measured electron capture transition intensities. A two-parameter γ-γ coincidence experiment was performed to determine the relationships between various γ transitions. Triton spectra from the 250Cf(α,t)251Es reaction were analyzed with an Enge split-pole magnetic spectrograph. On the basis of the present investigation the following intrinsic states were identified in 251Es: 3/2 - [521], 0; 7/2 + [633], 8.3; 1/2 - [521], 411; 7/2 - [514], 461.4; 9/2 + [624], 777.9; {7/2 + [633] ⊗ 2 +}11/2+ vibrational state, 889.1; {n[734]92- n[620]12+ p[521]32-}112+ three-quasiparticle state, 1239.0 keV. A Kπ=112+ state at 1264.9 keV was interpreted as a three-quasiparticle state but could not be given a definite assignment. This is the first time a definite identification of the proton orbitals 1/2 - [521] and 7/2 - [514] has been made in any nucleus. RADIOACTIVITY 251Fm [from 249Cf(α,2n)] measured Eγ, Iγ, Ece, Ice, γγ coin, α branching. NUCLEAR REACTIONS 250Cf(α,t), E=28.0 MeV; measured E (excitation), σ. 251Es deduced levels, ft(EC), γ multipolarity, I, π, five single-particle states, one vibrational state, and two three-quasiparticle states. Mass-separated 251Fm and 250Cf.

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