Low-lying states in Ra 219 and Rn 215: Sampling microsecond α -decaying nuclei

A. Såmark-Roth; L. G. Sarmiento; D. Rudolph; J. Ljungberg; B. G. Carlsson; C. Fahlander; U. Forsberg; P. Golubev; I. Ragnarsson; D. Ackermann; L. L. Andersson; M. Block; H. Brand; D. M. Cox; A. Di Nitto; Ch E. Düllmann; K. Eberhardt; J. Even; J. M. Gates; J. Gerl; K. E. Gregorich; C. J. Gross; R. D. Herzberg; F. P. Heßberger; E. Jäger; J. Khuyagbaatar; B. Kindler; I. Kojouharov; J. V. Kratz; J. Krier; N. Kurz; B. Lommel; A. Mistry; C. Mokry; J. P. Omtvedt; P. Papadakis; J. Runke; K. Rykaczewski; M. Schädel; H. Schaffner; B. Schausten; P. Thörle-Pospiech; N. Trautmann; T. Torres; A. Türler; A. Ward; N. Wiehl; A. Yakushev

doi:10.1103/PhysRevC.98.044307

Low-lying states in Ra 219 and Rn 215: Sampling microsecond α -decaying nuclei

A. Såmark-Roth, L. G. Sarmiento, D. Rudolph, J. Ljungberg, B. G. Carlsson, C. Fahlander, U. Forsberg, P. Golubev, I. Ragnarsson, D. Ackermann, L. L. Andersson, M. Block, H. Brand, D. M. Cox, A. Di Nitto, Ch E. Düllmann, K. Eberhardt, J. Even, J. M. Gates, J. GerlK. E. Gregorich, C. J. Gross, R. D. Herzberg, F. P. Heßberger, E. Jäger, J. Khuyagbaatar, B. Kindler, I. Kojouharov, J. V. Kratz, J. Krier, N. Kurz, B. Lommel, A. Mistry, C. Mokry, J. P. Omtvedt, P. Papadakis, J. Runke, K. Rykaczewski, M. Schädel, H. Schaffner, B. Schausten, P. Thörle-Pospiech, N. Trautmann, T. Torres, A. Türler, A. Ward, N. Wiehl, A. Yakushev

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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.

Original language	English
Article number	044307
Journal	Physical Review C
Volume	98
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.98.044307
State	Published - Oct 9 2018

Funding

The authors thank the ion-source and the accelerator staff at GSI. This work is supported by the European Community FP7–Capacities ENSAR No. 262010, the Royal Physiographic Society in Lund, the Swedish Research Council (Grant No. VR 2012-5253), the Knut and Alice Wallenberg foundation (Grant No. KAW 2015.0021), the German Federal Ministry of Education and Research, the U.S. Department of Energy, Office of Science, Nuclear Physics Program (Contract Nos. DE-AC05-00OR22725 and DE-AC02-05CH11231), and the UK Science and Technology Facilities Council.

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Såmark-Roth, A., Sarmiento, L. G., Rudolph, D., Ljungberg, J., Carlsson, B. G., Fahlander, C., Forsberg, U., Golubev, P., Ragnarsson, I., Ackermann, D., Andersson, L. L., Block, M., Brand, H., Cox, D. M., Di Nitto, A., Düllmann, C. E., Eberhardt, K., Even, J., Gates, J. M., ... Yakushev, A. (2018). Low-lying states in Ra 219 and Rn 215: Sampling microsecond α -decaying nuclei. Physical Review C, 98(4), Article 044307. https://doi.org/10.1103/PhysRevC.98.044307

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title = "Low-lying states in Ra 219 and Rn 215: 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.",

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",

note = "Publisher Copyright: {\textcopyright} 2018 American Physical Society.",

year = "2018",

month = oct,

day = "9",

doi = "10.1103/PhysRevC.98.044307",

language = "English",

volume = "98",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

number = "4",

}

Såmark-Roth, A, Sarmiento, LG, Rudolph, D, Ljungberg, J, Carlsson, BG, Fahlander, C, Forsberg, U, Golubev, P, Ragnarsson, I, Ackermann, D, Andersson, LL, Block, M, Brand, H, Cox, DM, Di Nitto, A, Düllmann, CE, Eberhardt, K, Even, J, Gates, JM, Gerl, J, Gregorich, KE, Gross, CJ, Herzberg, RD, Heßberger, FP, Jäger, E, Khuyagbaatar, J, Kindler, B, Kojouharov, I, Kratz, JV, Krier, J, Kurz, N, Lommel, B, Mistry, A, Mokry, C, Omtvedt, JP, Papadakis, P, Runke, J, Rykaczewski, K, Schädel, M, Schaffner, H, Schausten, B, Thörle-Pospiech, P, Trautmann, N, Torres, T, Türler, A, Ward, A, Wiehl, N & Yakushev, A 2018, 'Low-lying states in Ra 219 and Rn 215: Sampling microsecond α -decaying nuclei', Physical Review C, vol. 98, no. 4, 044307. https://doi.org/10.1103/PhysRevC.98.044307

TY - JOUR

T1 - Low-lying states in Ra 219 and Rn 215

T2 - Sampling microsecond α -decaying nuclei

AU - Såmark-Roth, A.

AU - Sarmiento, L. G.

AU - Rudolph, D.

AU - Ljungberg, J.

AU - Carlsson, B. G.

AU - Fahlander, C.

AU - Forsberg, U.

AU - Golubev, P.

AU - Ragnarsson, I.

AU - Ackermann, D.

AU - Andersson, L. L.

AU - Block, M.

AU - Brand, H.

AU - Cox, D. M.

AU - Di Nitto, A.

AU - Düllmann, Ch E.

AU - Eberhardt, K.

AU - Even, J.

AU - Gates, J. M.

AU - Gerl, J.

AU - Gregorich, K. E.

AU - Gross, C. J.

AU - Herzberg, R. D.

AU - Heßberger, F. P.

AU - Jäger, E.

AU - Khuyagbaatar, J.

AU - Kindler, B.

AU - Kojouharov, I.

AU - Kratz, J. V.

AU - Krier, J.

AU - Kurz, N.

AU - Lommel, B.

AU - Mistry, A.

AU - Mokry, C.

AU - Omtvedt, J. P.

AU - Papadakis, P.

AU - Runke, J.

AU - Rykaczewski, K.

AU - Schädel, M.

AU - Schaffner, H.

AU - Schausten, B.

AU - Thörle-Pospiech, P.

AU - Trautmann, N.

AU - Torres, T.

AU - Türler, A.

AU - Ward, A.

AU - Wiehl, N.

AU - Yakushev, A.

PY - 2018/10/9

Y1 - 2018/10/9

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/85054748434

U2 - 10.1103/PhysRevC.98.044307

DO - 10.1103/PhysRevC.98.044307

M3 - Article

AN - SCOPUS:85054748434

SN - 2469-9985

VL - 98

JO - Physical Review C

JF - Physical Review C

IS - 4

M1 - 044307

ER -

Low-lying states in Ra 219 and Rn 215: Sampling microsecond α -decaying nuclei

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