New Short-Lived Isotope 221U and the Mass Surface Near N=126

J. Khuyagbaatar; A. Yakushev; Ch. E. Düllmann; D. Ackermann; L.-L. Andersson; M. Block; H. Brand; D. M. Cox; J. Even; Ulrika Forsberg; Pavel Golubev; W. Hartmann; R.-D. Herzberg; F. P. Heßberger; J. Hoffmann; A. Hübner; E. Jäger; J. Jeppsson; B. Kindler; J. V. Kratz; J. Krier; N. Kurz; B. Lommel; M. Maiti; S. Minami; A. K. Mistry; Ch. M. Mrosek; I. Pysmenetska; Dirk Rudolph; Luis Sarmiento; H. Schaffner; M. Schädel; B. Schausten; J. Steiner; T. Torres De Heidenreich; J. Uusitalo; M. Wegrzecki; N. Wiehl; V. Yakusheva

doi:10.1103/PhysRevLett.115.242502

New Short-Lived Isotope 221U and the Mass Surface Near N=126

J. Khuyagbaatar, A. Yakushev, Ch. E. Düllmann, D. Ackermann, L.-L. Andersson, M. Block, H. Brand, D. M. Cox, J. Even, Ulrika Forsberg, Pavel Golubev, W. Hartmann, R.-D. Herzberg, F. P. Heßberger, J. Hoffmann, A. Hübner, E. Jäger, J. Jeppsson, B. Kindler, J. V. KratzJ. Krier, N. Kurz, B. Lommel, M. Maiti, S. Minami, A. K. Mistry, Ch. M. Mrosek, I. Pysmenetska, Dirk Rudolph, Luis Sarmiento, H. Schaffner, M. Schädel, B. Schausten, J. Steiner, T. Torres De Heidenreich, J. Uusitalo, M. Wegrzecki, N. Wiehl, V. Yakusheva

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Abstract

Two short-lived isotopes 221U and 222U were produced as evaporation residues in the fusion reaction 50Ti+176Yb at the gas-filled recoil separator TASCA. An α decay with an energy of Eα=9.31(5) MeV and half-life T1/2=4.7(7) μs was attributed to 222U. The new isotope 221U was identified in α-decay chains starting with Eα=9.71(5) MeV and T1/2=0.66(14) μs leading to known daughters. Synthesis and detection of these unstable heavy nuclei and their descendants were achieved thanks to a fast data readout system. The evolution of the N=126 shell closure and its influence on the stability of uranium isotopes are discussed within the framework of α-decay reduced width.

Original language	English
Article number	242502
Number of pages	4
Journal	Physical Review Letters
Volume	115
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevLett.115.242502
Publication status	Published - 2015

Subject classification (UKÄ)

Subatomic Physics

Free keywords

Heavy Elements
Shell Structure
Sampling Electronics

Access to Document

10.1103/PhysRevLett.115.242502

PhysRevLett.115.242502

1 Article

Low-lying states in ²¹⁹Ra and ²¹⁵Rn: Sampling microsecond α-decaying nuclei
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. & Gerl, J. & 28 others, Gregorich, K. E., Gross, C. J., Herzberg, R. D., Heßberger, F. P., Jäger, E., Khuyagbaatar, J., Kindler, B., Kojouharov, I., Kratz, J. V., Krier, J., Kurz, N., Lommel, B., Mistry, A., Mokry, C., Omtvedt, J. P., 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 Oct 9, In: Physical Review C. 98, 4, 11 p., 044307.
Research output: Contribution to journal › Article › peer-review

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Nuclear Structure at the Limits: Isotope-selective Spectroscopy
Rudolph, D. (PI), Fahlander, C. (CoI), Golubev, P. (CoI), Sarmiento Pico, L. (CoI), Cox, D. (Researcher), Hrabar, Y. (Research student), Såmark-Roth, A. (Research student), Forsberg, U. (Researcher), Lorenz, C. (Research student), Lalovic, N. (Researcher), Lalovic, N. (Research student), Forsberg, U. (Research student), Gellanki, J. (Research student), Hoischen, R. (Research student), Johansson, E. (Research student), Andersson, L.-L. (Research student), du Rietz, R. (Research student), Ekman, J. (Research student) & Andreoiu, C. (Research student)
Swedish Research Council
2002/01/01 → 2027/12/31
Project: Research

Cite this

Khuyagbaatar, J., Yakushev, A., Düllmann, C. E., Ackermann, D., Andersson, L.-L., Block, M., Brand, H., Cox, D. M., Even, J., Forsberg, U., Golubev, P., Hartmann, W., Herzberg, R.-D., Heßberger, F. P., Hoffmann, J., Hübner, A., Jäger, E., Jeppsson, J., Kindler, B., ... Yakusheva, V. (2015). New Short-Lived Isotope 221U and the Mass Surface Near N=126. Physical Review Letters, 115(24), Article 242502. https://doi.org/10.1103/PhysRevLett.115.242502

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title = "New Short-Lived Isotope 221U and the Mass Surface Near N=126",

abstract = "Two short-lived isotopes 221U and 222U were produced as evaporation residues in the fusion reaction 50Ti+176Yb at the gas-filled recoil separator TASCA. An α decay with an energy of Eα=9.31(5) MeV and half-life T1/2=4.7(7) μs was attributed to 222U. The new isotope 221U was identified in α-decay chains starting with Eα=9.71(5) MeV and T1/2=0.66(14) μs leading to known daughters. Synthesis and detection of these unstable heavy nuclei and their descendants were achieved thanks to a fast data readout system. The evolution of the N=126 shell closure and its influence on the stability of uranium isotopes are discussed within the framework of α-decay reduced width.",

keywords = "Heavy Elements, Shell Structure, Sampling Electronics",

author = "J. Khuyagbaatar and A. Yakushev and Ch. E. D{\"u}llmann and D. Ackermann and L.-L. Andersson and M. Block and H. Brand and D. M. Cox and J. Even and Ulrika Forsberg and Pavel Golubev and W. Hartmann and R.-D. Herzberg and F. P. He{\ss}berger and J. Hoffmann and A. H{\"u}bner and E. J{\"a}ger and J. Jeppsson and B. Kindler and J. V. Kratz and J. Krier and N. Kurz and B. Lommel and M. Maiti and S. Minami and A. K. Mistry and Ch. M. Mrosek and I. Pysmenetska and Dirk Rudolph and Luis Sarmiento and H. Schaffner and M. Sch{\"a}del and B. Schausten and J. Steiner and {De Heidenreich}, {T. Torres} and J. Uusitalo and M. Wegrzecki and N. Wiehl and V. Yakusheva",

year = "2015",

doi = "10.1103/PhysRevLett.115.242502",

language = "English",

volume = "115",

journal = "Physical Review Letters",

issn = "1079-7114",

publisher = "American Physical Society",

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Khuyagbaatar, J, Yakushev, A, Düllmann, CE, Ackermann, D, Andersson, L-L, Block, M, Brand, H, Cox, DM, Even, J, Forsberg, U, Golubev, P, Hartmann, W, Herzberg, R-D, Heßberger, FP, Hoffmann, J, Hübner, A, Jäger, E, Jeppsson, J, Kindler, B, Kratz, JV, Krier, J, Kurz, N, Lommel, B, Maiti, M, Minami, S, Mistry, AK, Mrosek, CM, Pysmenetska, I, Rudolph, D , Sarmiento, L, Schaffner, H, Schädel, M, Schausten, B, Steiner, J, De Heidenreich, TT, Uusitalo, J, Wegrzecki, M, Wiehl, N & Yakusheva, V 2015, 'New Short-Lived Isotope 221U and the Mass Surface Near N=126', Physical Review Letters, vol. 115, no. 24, 242502. https://doi.org/10.1103/PhysRevLett.115.242502

TY - JOUR

T1 - New Short-Lived Isotope 221U and the Mass Surface Near N=126

AU - Khuyagbaatar, J.

AU - Yakushev, A.

AU - Düllmann, Ch. E.

AU - Ackermann, D.

AU - Andersson, L.-L.

AU - Block, M.

AU - Brand, H.

AU - Cox, D. M.

AU - Even, J.

AU - Forsberg, Ulrika

AU - Golubev, Pavel

AU - Hartmann, W.

AU - Herzberg, R.-D.

AU - Heßberger, F. P.

AU - Hoffmann, J.

AU - Hübner, A.

AU - Jäger, E.

AU - Jeppsson, J.

AU - Kindler, B.

AU - Kratz, J. V.

AU - Krier, J.

AU - Kurz, N.

AU - Lommel, B.

AU - Maiti, M.

AU - Minami, S.

AU - Mistry, A. K.

AU - Mrosek, Ch. M.

AU - Pysmenetska, I.

AU - Rudolph, Dirk

AU - Sarmiento, Luis

AU - Schaffner, H.

AU - Schädel, M.

AU - Schausten, B.

AU - Steiner, J.

AU - De Heidenreich, T. Torres

AU - Uusitalo, J.

AU - Wegrzecki, M.

AU - Wiehl, N.

AU - Yakusheva, V.

PY - 2015

Y1 - 2015

N2 - Two short-lived isotopes 221U and 222U were produced as evaporation residues in the fusion reaction 50Ti+176Yb at the gas-filled recoil separator TASCA. An α decay with an energy of Eα=9.31(5) MeV and half-life T1/2=4.7(7) μs was attributed to 222U. The new isotope 221U was identified in α-decay chains starting with Eα=9.71(5) MeV and T1/2=0.66(14) μs leading to known daughters. Synthesis and detection of these unstable heavy nuclei and their descendants were achieved thanks to a fast data readout system. The evolution of the N=126 shell closure and its influence on the stability of uranium isotopes are discussed within the framework of α-decay reduced width.

AB - Two short-lived isotopes 221U and 222U were produced as evaporation residues in the fusion reaction 50Ti+176Yb at the gas-filled recoil separator TASCA. An α decay with an energy of Eα=9.31(5) MeV and half-life T1/2=4.7(7) μs was attributed to 222U. The new isotope 221U was identified in α-decay chains starting with Eα=9.71(5) MeV and T1/2=0.66(14) μs leading to known daughters. Synthesis and detection of these unstable heavy nuclei and their descendants were achieved thanks to a fast data readout system. The evolution of the N=126 shell closure and its influence on the stability of uranium isotopes are discussed within the framework of α-decay reduced width.

KW - Heavy Elements

KW - Shell Structure

KW - Sampling Electronics

U2 - 10.1103/PhysRevLett.115.242502

DO - 10.1103/PhysRevLett.115.242502

M3 - Article

C2 - 26705628

SN - 1079-7114

VL - 115

JO - Physical Review Letters

JF - Physical Review Letters

IS - 24

M1 - 242502

ER -

New Short-Lived Isotope 221U and the Mass Surface Near N=126

Abstract

Subject classification (UKÄ)

Free keywords

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Research output

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

Projects

Nuclear Structure at the Limits: Isotope-selective Spectroscopy

Cite this

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