Alpha decay study of 218U; A search for the sub-shell closure at Z=92

A. P. Leppänen; J. Uusitalo; S. Eeckhaudt; T. Enqvist; K. Eskola; T. Grahn; F. P. Heßberger; P. T. Greenlees; P. Jones; R. Julin; S. Juutinen; H. Kettunen; P. Kuusiniemi; M. Leino; P. Nieminen; J. Pakarinen; J. Perkowski; P. Rahkila; C. Scholey; G. Sletten

doi:10.1063/1.2200991

Alpha decay study of ²¹⁸U; A search for the sub-shell closure at Z=92

A. P. Leppänen^*, J. Uusitalo, S. Eeckhaudt, T. Enqvist, K. Eskola, T. Grahn, F. P. Heßberger, P. T. Greenlees, P. Jones, R. Julin, S. Juutinen, H. Kettunen, P. Kuusiniemi, M. Leino, P. Nieminen, J. Pakarinen, J. Perkowski, P. Rahkila, C. Scholey, G. Sletten

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

Neutron-deficient uranium isotopes ²¹⁸U and ²¹⁹U were studied via α spectroscopic methods. The isotopes were produced in fusion evaporation reaction ¹⁸²W(⁴⁰Ar,xn)^222-xnU. The ground state decay properties of ²¹⁸U were measured with improved statistics and in addition a low-lying α decaying isomeric state was discovered. The isomer in ²¹⁸U decays by α emission with an energy of E_α=10 678(17) keV and with a half-life of T _1/2=(0.56_-0.14^+0.26)ms. The new isomeric state was assigned spin and parity I^Π = 8⁺. The ground state α decay has an energy of E_α=8612(9) keV and a half-life of T_1/2=(0.51_-0.10^+0.17)ms. The ground state decay properties of ²¹⁹U were determined with improved statistics as E_α=9774(18) keV and a half-life of T_1/2=(0.08 _-0.03^+0.10)ms.

Original language	English
Title of host publication	Frontiers in Nuclear Structure, Astrophysics, and Reactions - FINUSTAR
Pages	487-489
Number of pages	3
DOIs	https://doi.org/10.1063/1.2200991
Publication status	Published - 26 Apr 2006
Event	International Conference on Frontiers in Nuclear Structure, Astrophysics, and Reactions - FINUSTAR - Isle of Kos, Greece Duration: 12 Sept 2005 → 17 Sept 2005

Publication series

Name	AIP Conference Proceedings
Volume	831
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	International Conference on Frontiers in Nuclear Structure, Astrophysics, and Reactions - FINUSTAR
Country/Territory	Greece
City	Isle of Kos
Period	12/09/05 → 17/09/05

Access to Document

10.1063/1.2200991

Cite this

Leppänen, A. P., Uusitalo, J., Eeckhaudt, S., Enqvist, T., Eskola, K., Grahn, T., Heßberger, F. P., Greenlees, P. T., Jones, P., Julin, R., Juutinen, S., Kettunen, H., Kuusiniemi, P., Leino, M., Nieminen, P., Pakarinen, J., Perkowski, J., Rahkila, P., Scholey, C., & Sletten, G. (2006). Alpha decay study of ²¹⁸U; A search for the sub-shell closure at Z=92. In Frontiers in Nuclear Structure, Astrophysics, and Reactions - FINUSTAR (pp. 487-489). (AIP Conference Proceedings; Vol. 831). https://doi.org/10.1063/1.2200991

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title = "Alpha decay study of 218U; A search for the sub-shell closure at Z=92",

abstract = "Neutron-deficient uranium isotopes 218U and 219U were studied via α spectroscopic methods. The isotopes were produced in fusion evaporation reaction 182W(40Ar,xn)222-xnU. The ground state decay properties of 218U were measured with improved statistics and in addition a low-lying α decaying isomeric state was discovered. The isomer in 218U decays by α emission with an energy of Eα=10 678(17) keV and with a half-life of T 1/2=(0.56-0.14+0.26)ms. The new isomeric state was assigned spin and parity IΠ = 8+. The ground state α decay has an energy of Eα=8612(9) keV and a half-life of T1/2=(0.51-0.10+0.17)ms. The ground state decay properties of 219U were determined with improved statistics as Eα=9774(18) keV and a half-life of T1/2=(0.08 -0.03+0.10)ms.",

keywords = "190≤A≤219, Alpha decay, Compound nucleus",

author = "Lepp{\"a}nen, {A. P.} and J. Uusitalo and S. Eeckhaudt and T. Enqvist and K. Eskola and T. Grahn and He{\ss}berger, {F. P.} and Greenlees, {P. T.} and P. Jones and R. Julin and S. Juutinen and H. Kettunen and P. Kuusiniemi and M. Leino and P. Nieminen and J. Pakarinen and J. Perkowski and P. Rahkila and C. Scholey and G. Sletten",

year = "2006",

month = apr,

day = "26",

doi = "10.1063/1.2200991",

language = "English",

isbn = "0735403236",

series = "AIP Conference Proceedings",

pages = "487--489",

booktitle = "Frontiers in Nuclear Structure, Astrophysics, and Reactions - FINUSTAR",

note = "International Conference on Frontiers in Nuclear Structure, Astrophysics, and Reactions - FINUSTAR ; Conference date: 12-09-2005 Through 17-09-2005",

}

Leppänen, AP, Uusitalo, J, Eeckhaudt, S, Enqvist, T, Eskola, K, Grahn, T, Heßberger, FP, Greenlees, PT, Jones, P, Julin, R, Juutinen, S, Kettunen, H, Kuusiniemi, P, Leino, M, Nieminen, P, Pakarinen, J, Perkowski, J, Rahkila, P, Scholey, C & Sletten, G 2006, Alpha decay study of ²¹⁸U; A search for the sub-shell closure at Z=92. in Frontiers in Nuclear Structure, Astrophysics, and Reactions - FINUSTAR. AIP Conference Proceedings, vol. 831, pp. 487-489, International Conference on Frontiers in Nuclear Structure, Astrophysics, and Reactions - FINUSTAR, Isle of Kos, Greece, 12/09/05. https://doi.org/10.1063/1.2200991

TY - GEN

T1 - Alpha decay study of 218U; A search for the sub-shell closure at Z=92

AU - Leppänen, A. P.

AU - Uusitalo, J.

AU - Eeckhaudt, S.

AU - Enqvist, T.

AU - Eskola, K.

AU - Grahn, T.

AU - Heßberger, F. P.

AU - Greenlees, P. T.

AU - Jones, P.

AU - Julin, R.

AU - Juutinen, S.

AU - Kettunen, H.

AU - Kuusiniemi, P.

AU - Leino, M.

AU - Nieminen, P.

AU - Pakarinen, J.

AU - Perkowski, J.

AU - Rahkila, P.

AU - Scholey, C.

AU - Sletten, G.

PY - 2006/4/26

Y1 - 2006/4/26

N2 - Neutron-deficient uranium isotopes 218U and 219U were studied via α spectroscopic methods. The isotopes were produced in fusion evaporation reaction 182W(40Ar,xn)222-xnU. The ground state decay properties of 218U were measured with improved statistics and in addition a low-lying α decaying isomeric state was discovered. The isomer in 218U decays by α emission with an energy of Eα=10 678(17) keV and with a half-life of T 1/2=(0.56-0.14+0.26)ms. The new isomeric state was assigned spin and parity IΠ = 8+. The ground state α decay has an energy of Eα=8612(9) keV and a half-life of T1/2=(0.51-0.10+0.17)ms. The ground state decay properties of 219U were determined with improved statistics as Eα=9774(18) keV and a half-life of T1/2=(0.08 -0.03+0.10)ms.

AB - Neutron-deficient uranium isotopes 218U and 219U were studied via α spectroscopic methods. The isotopes were produced in fusion evaporation reaction 182W(40Ar,xn)222-xnU. The ground state decay properties of 218U were measured with improved statistics and in addition a low-lying α decaying isomeric state was discovered. The isomer in 218U decays by α emission with an energy of Eα=10 678(17) keV and with a half-life of T 1/2=(0.56-0.14+0.26)ms. The new isomeric state was assigned spin and parity IΠ = 8+. The ground state α decay has an energy of Eα=8612(9) keV and a half-life of T1/2=(0.51-0.10+0.17)ms. The ground state decay properties of 219U were determined with improved statistics as Eα=9774(18) keV and a half-life of T1/2=(0.08 -0.03+0.10)ms.

KW - 190≤A≤219

KW - Alpha decay

KW - Compound nucleus

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U2 - 10.1063/1.2200991

DO - 10.1063/1.2200991

M3 - Conference contribution

AN - SCOPUS:33845405134

SN - 0735403236

SN - 9780735403239

T3 - AIP Conference Proceedings

SP - 487

EP - 489

BT - Frontiers in Nuclear Structure, Astrophysics, and Reactions - FINUSTAR

T2 - International Conference on Frontiers in Nuclear Structure, Astrophysics, and Reactions - FINUSTAR

Y2 - 12 September 2005 through 17 September 2005

ER -