Engineering topics

Lalkovski, S

Publications and source records attributed to Lalkovski, S.

4 records

DOE OSTI2011

Gamma-ray coincidence and fast-timing measurements using LaBr{sub 3}(Ce) detectors and gammasphere

The performance of new scintillator detectors based on LaBr{sub 3}(Ce) technology was evaluated in conjunction with the Gammasphere spectrometer. Specifically, the lifetimes of states between 50 ps and 1 ns, populated in the decay of the {sup 177m}Lu isomeric state (T{sub 1/2} = 160 d), have been measured. Even though the decay scheme is rather complex, it is possible to perform precise measurements because of the superior energy resolution of the LaBr{sub 3}(Ce) detectors, compared to that of BaF{sub 2} scintillators, when used in combination with the power of the Gammasphere array to isolate a specific {gamma} cascade

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗

DOE OSTI2011

In-beam fast-timing measurements in {sup 103,105,107}Cd

Fast-timing measurements were performed in the region of the medium-mass {sup 103,105,107}Cd isotopes, produced in fusion evaporation reactions. Results on new and reevaluated half-lives are analyzed within a systematic study of transition rates. The 7/2{sub 1}{sup +} states in {sup 103,105,107}Cd are interpreted as arising from a single-particle excitation. The 9/2{sup +} states configuration assignment is based on the observed decay branches.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗

DOE OSTI2011

First observation of the decay of a 15{sup -} seniority v=4 isomer in {sup 128}Sn

Isomeric states in the semimagic {sup 128-130}Sn isotopes were populated in the fragmentation of a {sup 136}Xe beam on a {sup 9}Be target at an energy of 750 A{center_dot}MeV. The decay of an isomeric state in {sup 128}Sn at an excitation energy of 4098 keV has been observed. Its half live has been determined to be T{sub 1/2}=220(30) ns from the time distributions of the delayed {gamma} rays emitted in its decay. {gamma}{gamma} coincidence relations were analyzed in order to establish the decay pattern of the newly established state toward the known (7{sup -}) and (10{sup +}) isomers at excitation energies of 2092 and 2492 keV, respectively. Based on a comparison with results of state-of-the-art shell-model calculations the new isomeric state is proposed to have the {nu}h{sub 11/2}{sup -3}d{sub 3/2}{sup -1} configuration with the four neutron holes in {sup 132}Sn maximally aligned to a total spin of I{sup {pi}}=15{sup -}.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗

DOE OSTI2011

Nuclear Data Sheets for A = 207

Evaluated nuclear structure and decay data for all nuclei within the A=207 mass chain are presented. The experimental data are evaluated and best values for level and gamma-ray energies, quantum numbers, lifetimes, gamma-ray intensities, and other nuclear properties are recommended. Inconsistencies and discrepancies that exist in the literature are noted. This work supersedes the earlier evaluation by M.J. Martin (1993Ma73), published in Nuclear Data Sheets70, 315 (1993).

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗