Decay of the 9/2(-) isomer in Tl-181 and mass determination of low-lying states in Tl-181, Au-177, and Ir-173

A. N. Andreyev; S. Antalic; D. Ackermann; T. E. Cocolios; V. F. Comas; J. Elseviers; S. Franchoo; S. Heinz; J. A. Heredia; F. P. Hessberger; S. Hofmann; M. Huyse; J. Khuyagbaatar; I. Kojouharov; B. Kindler; B. Lommel; R. Mann; R. D. Page; S. Rinta-Antila; P. J. Sapple; S. Saro; P. Van Duppen; M. Venhart; H. V. Watkins

doi:10.1103/PhysRevC.80.024302

Decay of the 9/2(-) isomer in Tl-181 and mass determination of low-lying states in Tl-181, Au-177, and Ir-173

A. N. Andreyev^*, S. Antalic, D. Ackermann, T. E. Cocolios, V. F. Comas, J. Elseviers, S. Franchoo, S. Heinz, J. A. Heredia, F. P. Hessberger, S. Hofmann, M. Huyse, J. Khuyagbaatar, I. Kojouharov, B. Kindler, B. Lommel, R. Mann, R. D. Page, S. Rinta-Antila, P. J. SappleS. Saro, P. Van Duppen, M. Venhart, H. V. Watkins

^*Corresponding author for this work

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

A detailed spectroscopic study of the neutron-deficient isotope Tl-181 and the daughter of its alpha decay, Au-177, has been performed in the complete fusion reaction Ca-40+Sm-144 -> Pb-184(*) at the velocity filter SHIP (GSI). The mass excess, excitation energy, and decay scheme of the isomeric 1.40(3) ms, 9/2(-) intruder state in Tl-181 have been established for the first time. These results solve a long-standing puzzle of the unrealistically large reduced alpha-decay width of this isomer. Based on this, the previously unknown masses of the long-lived isomeric states in Au-177 and Ir-173 have been derived. In turn, it now allows the excitation energies of previously identified bands in Au-177 and Ir-173 to be deduced and compared with theoretical predictions. First measurements of alpha-decay branching ratios for Tl-181(m) and Au-177(m,g) are also reported.

Original language	English
Article number	ARTN 024302
Number of pages	8
Journal	Physical Review C
Volume	80
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevC.80.024302
Publication status	Published - 4 Aug 2009

Keywords

INTRUDER STATES
COEXISTENCE
SPECTROSCOPY
ALPHA-DECAY
RADIOACTIVITY
IDENTIFICATION
TL NUCLEI
MERCURY ISOTOPES
ODD BI ISOTOPES
NEUTRON-DEFICIENT ISOTOPES

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Andreyev, A. N., Antalic, S., Ackermann, D., Cocolios, T. E., Comas, V. F., Elseviers, J., Franchoo, S., Heinz, S., Heredia, J. A., Hessberger, F. P., Hofmann, S., Huyse, M., Khuyagbaatar, J., Kojouharov, I., Kindler, B., Lommel, B., Mann, R., Page, R. D., Rinta-Antila, S., ... Watkins, H. V. (2009). Decay of the 9/2(-) isomer in Tl-181 and mass determination of low-lying states in Tl-181, Au-177, and Ir-173. Physical Review C, 80(2), Article ARTN 024302. https://doi.org/10.1103/PhysRevC.80.024302

@article{b8f48426b4224df9a2f27db5aa51da6e,

title = "Decay of the 9/2(-) isomer in Tl-181 and mass determination of low-lying states in Tl-181, Au-177, and Ir-173",

abstract = "A detailed spectroscopic study of the neutron-deficient isotope Tl-181 and the daughter of its alpha decay, Au-177, has been performed in the complete fusion reaction Ca-40+Sm-144 -> Pb-184(*) at the velocity filter SHIP (GSI). The mass excess, excitation energy, and decay scheme of the isomeric 1.40(3) ms, 9/2(-) intruder state in Tl-181 have been established for the first time. These results solve a long-standing puzzle of the unrealistically large reduced alpha-decay width of this isomer. Based on this, the previously unknown masses of the long-lived isomeric states in Au-177 and Ir-173 have been derived. In turn, it now allows the excitation energies of previously identified bands in Au-177 and Ir-173 to be deduced and compared with theoretical predictions. First measurements of alpha-decay branching ratios for Tl-181(m) and Au-177(m,g) are also reported.",

keywords = "INTRUDER STATES, COEXISTENCE, SPECTROSCOPY, ALPHA-DECAY, RADIOACTIVITY, IDENTIFICATION, TL NUCLEI, MERCURY ISOTOPES, ODD BI ISOTOPES, NEUTRON-DEFICIENT ISOTOPES",

author = "Andreyev, {A. N.} and S. Antalic and D. Ackermann and Cocolios, {T. E.} and Comas, {V. F.} and J. Elseviers and S. Franchoo and S. Heinz and Heredia, {J. A.} and Hessberger, {F. P.} and S. Hofmann and M. Huyse and J. Khuyagbaatar and I. Kojouharov and B. Kindler and B. Lommel and R. Mann and Page, {R. D.} and S. Rinta-Antila and Sapple, {P. J.} and S. Saro and {Van Duppen}, P. and M. Venhart and Watkins, {H. V.}",

year = "2009",

month = aug,

day = "4",

doi = "10.1103/PhysRevC.80.024302",

language = "English",

volume = "80",

journal = "Physical Review C",

issn = "0556-2813",

publisher = "American Physical Society",

number = "2",

}

Andreyev, AN, Antalic, S, Ackermann, D, Cocolios, TE, Comas, VF, Elseviers, J, Franchoo, S, Heinz, S, Heredia, JA, Hessberger, FP, Hofmann, S, Huyse, M, Khuyagbaatar, J, Kojouharov, I, Kindler, B, Lommel, B, Mann, R, Page, RD, Rinta-Antila, S, Sapple, PJ, Saro, S, Van Duppen, P, Venhart, M & Watkins, HV 2009, 'Decay of the 9/2(-) isomer in Tl-181 and mass determination of low-lying states in Tl-181, Au-177, and Ir-173', Physical Review C, vol. 80, no. 2, ARTN 024302. https://doi.org/10.1103/PhysRevC.80.024302

TY - JOUR

T1 - Decay of the 9/2(-) isomer in Tl-181 and mass determination of low-lying states in Tl-181, Au-177, and Ir-173

AU - Andreyev, A. N.

AU - Antalic, S.

AU - Ackermann, D.

AU - Cocolios, T. E.

AU - Comas, V. F.

AU - Elseviers, J.

AU - Franchoo, S.

AU - Heinz, S.

AU - Heredia, J. A.

AU - Hessberger, F. P.

AU - Hofmann, S.

AU - Huyse, M.

AU - Khuyagbaatar, J.

AU - Kojouharov, I.

AU - Kindler, B.

AU - Lommel, B.

AU - Mann, R.

AU - Page, R. D.

AU - Rinta-Antila, S.

AU - Sapple, P. J.

AU - Saro, S.

AU - Van Duppen, P.

AU - Venhart, M.

AU - Watkins, H. V.

PY - 2009/8/4

Y1 - 2009/8/4

N2 - A detailed spectroscopic study of the neutron-deficient isotope Tl-181 and the daughter of its alpha decay, Au-177, has been performed in the complete fusion reaction Ca-40+Sm-144 -> Pb-184(*) at the velocity filter SHIP (GSI). The mass excess, excitation energy, and decay scheme of the isomeric 1.40(3) ms, 9/2(-) intruder state in Tl-181 have been established for the first time. These results solve a long-standing puzzle of the unrealistically large reduced alpha-decay width of this isomer. Based on this, the previously unknown masses of the long-lived isomeric states in Au-177 and Ir-173 have been derived. In turn, it now allows the excitation energies of previously identified bands in Au-177 and Ir-173 to be deduced and compared with theoretical predictions. First measurements of alpha-decay branching ratios for Tl-181(m) and Au-177(m,g) are also reported.

AB - A detailed spectroscopic study of the neutron-deficient isotope Tl-181 and the daughter of its alpha decay, Au-177, has been performed in the complete fusion reaction Ca-40+Sm-144 -> Pb-184(*) at the velocity filter SHIP (GSI). The mass excess, excitation energy, and decay scheme of the isomeric 1.40(3) ms, 9/2(-) intruder state in Tl-181 have been established for the first time. These results solve a long-standing puzzle of the unrealistically large reduced alpha-decay width of this isomer. Based on this, the previously unknown masses of the long-lived isomeric states in Au-177 and Ir-173 have been derived. In turn, it now allows the excitation energies of previously identified bands in Au-177 and Ir-173 to be deduced and compared with theoretical predictions. First measurements of alpha-decay branching ratios for Tl-181(m) and Au-177(m,g) are also reported.

KW - INTRUDER STATES

KW - COEXISTENCE

KW - SPECTROSCOPY

KW - ALPHA-DECAY

KW - RADIOACTIVITY

KW - IDENTIFICATION

KW - TL NUCLEI

KW - MERCURY ISOTOPES

KW - ODD BI ISOTOPES

KW - NEUTRON-DEFICIENT ISOTOPES

UR - http://www.scopus.com/inward/record.url?scp=68949137068&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.80.024302

DO - 10.1103/PhysRevC.80.024302

M3 - Article

SN - 0556-2813

VL - 80

JO - Physical Review C

JF - Physical Review C

IS - 2

M1 - ARTN 024302

ER -

Decay of the 9/2(-) isomer in Tl-181 and mass determination of low-lying states in Tl-181, Au-177, and Ir-173

Abstract

Keywords

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