Low-lying states in Ra219 and Rn215: Sampling microsecond α-decaying nuclei

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title = "Low-lying states in Ra219 and Rn215: Sampling microsecond α-decaying nuclei",
abstract = "Short-lived α-decaying nuclei {"}northeast{"} of Pb208 in the chart of nuclides were studied using the reaction Ca48+Am243 with the decay station TASISpec at TASCA, GSI Darmstadt. Decay energies and times from pile-up events were extracted with a tailor-made pulse-shape analysis routine and specific α-decay chains were identified in a correlation analysis. Decay chains starting with the even-even Ra220 and its odd-A neighbors, Fr219, and Ra221,219, with a focus on the Ra219→Rn215 decay, were studied by means of α-γ spectroscopy. A revised α-decay scheme of Ra219 is proposed, including a new decay branch from a previously not considered isomeric state at 17 keV excitation energy. Conclusions on nuclear structure are drawn from the experimental data, aided by Geant4 simulations and a discussion on theoretical calculations.",
keywords = "alpha decay, half life, gamma-ray spectroscopy, pulse shape analysis, nuclear shell model, Nilsson-Strutinsky calculations",
author = "A. S{\aa}mark-Roth and Sarmiento, {L. G.} and D. Rudolph and J. Ljungberg and Carlsson, {B. G.} and C. Fahlander and U. Forsberg and P. Golubev and I. Ragnarsson and D. Ackermann and Andersson, {L. L.} and M. Block and H. Brand and Cox, {D. M.} and {Di Nitto}, A. and D{\"u}llmann, {Ch E.} and K. Eberhardt and J. Even and Gates, {J. M.} and J. Gerl and Gregorich, {K. E.} and Gross, {C. J.} and Herzberg, {R. D.} and He{\ss}berger, {F. P.} and E. J{\"a}ger and J. Khuyagbaatar and B. Kindler and I. Kojouharov and Kratz, {J. V.} and J. Krier and N. Kurz and B. Lommel and A. Mistry and C. Mokry and Omtvedt, {J. P.} and P. Papadakis and J. Runke and K. Rykaczewski and M. Sch{\"a}del and H. Schaffner and B. Schausten and P. Th{\"o}rle-Pospiech and N. Trautmann and T. Torres and A. T{\"u}rler and A. Ward and N. Wiehl and A. Yakushev",
year = "2018",
month = "10",
day = "9",
doi = "10.1103/PhysRevC.98.044307",
language = "English",
volume = "98",
journal = "Physical Review C: covering nuclear physics",
issn = "2469-9985",
publisher = "American Physical Society",
number = "4",