Nuclear Data Sheets for A = 203

Spectroscopy of the proton drip-line nucleus203Fr

“…Furthermore, the different isotopes were identified by linking the recoils with their subsequent α decays in the DSSD, using spatial and temporal correlations. An α-decay branch close to 100% and a half-life of 0.55(1) s for the 9/2 − ground state [36] allowed for an effective identification of the 203 Fr recoils. A maximum correlation time of 1.5 s was used between the implantation of the recoil and its subsequent α decay.…”

Neutron activation cross sections on lead isotopes

“…The reactions used for the unfolding, the decay data of the reaction products [20], and the references of the required evaluated cross sections are included in Table II. The neutron fluence rate was determined using the well-known 27 Al(n,α) 24 Na reaction cross section, except for the neutron [21] that is based on the masses given by Audi and Wapstra [22].…”

“…Here, this is also partially illustrated with the TALYS-lf calculation. In this calculation we have included a level and decay scheme that is based on the most recent ENSDF evaluation [24] for A = 203. In contrast, the TALYS, TALYS-µ, and STAPRE calculations use the previous evaluated data set which differs in the first 25 levels and their decay.…”

“…The induced activities were determined by gamma-ray spectrometry using HPGe detectors in a low-background shields. Neutron fluences were determined with the well-known cross section of the 27 Al(n,α) 24 Na reaction. Contributions from spurious low energy neutrons were estimated with five additional activation standards and experimental knowledge about the neutron spectrum from time-of-flight measurements.…”

First investigation of excited states in the odd-proton nucleusFr209

“…A considerable amount of spectroscopic information is available for isotopes with Z 82 [7][8][9][10][11][12][13][14][15][16][17][18][19][20]; however, for nuclei with Z > 82, the situation is less satisfying. The structure of even-even Po, Rn, and, to a lesser extent, Ra nuclei have been well-established, but relatively less spectroscopic information is available for odd-Z isotopes.…”