First trap-assisted decay spectroscopy of the $$^{81}$$Ge ground state
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Published:2022-03
Issue:3
Volume:58
Page:
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ISSN:1434-6001
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Container-title:The European Physical Journal A
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language:en
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Short-container-title:Eur. Phys. J. A
Author:
Delafosse C.ORCID, Goasduff A., Kankainen A.ORCID, Verney D., Al Ayoubi L., Beliuskina O., Cañete L., Eronen T.ORCID, de Groote R. P., Hukkanen M., Ibrahim F., Illana A., Jaries A., Lalanne L., Moore I. D., Nesterenko D.ORCID, Penttilä H., Rinta-Antila S., de Roubin A.ORCID, Thisse D., Thoër R., Tocabens G.
Abstract
AbstractThe $$\beta $$
β
-delayed $$\gamma $$
γ
spectroscopy of $$^{81}$$
81
As has been performed using a purified beam of $$^{81}$$
81
Ge $$(9/2^+)$$
(
9
/
2
+
)
ground state at the Ion Guide Isotope Separator On-Line facility (IGISOL). The $$^{81}$$
81
Ge$$^+$$
+
ions were produced using proton-induced fission of $$^{232}$$
232
Th and selected with the double Penning trap JYFLTRAP for the post-trap decay spectroscopy measurements. The low-spin $$(1/2^+)$$
(
1
/
2
+
)
isomeric-state ions $$^{81m}\hbox {Ge}^+$$
81
m
Ge
+
were not observed in the fission products. The intrinsic half-life of the $$^{81}$$
81
Ge ground state has been determined as $$T_{1/2}=6.4(2)~\hbox {s}$$
T
1
/
2
=
6.4
(
2
)
s
, which is significantly shorter than the literature value. A new level scheme of $$^{81}$$
81
As has been built and is compared to shell-model calculations.
Funder
H2020 Marie Skłodowska-Curie Actions Agence Nationale de la Recherche H2020 European Research Council Academy of Finland Seventh Framework Programme
Publisher
Springer Science and Business Media LLC
Subject
Nuclear and High Energy Physics
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