Speaker
Dr
Anu Kankainen
(University of Jyväskylä)
Description
JYFLTRAP is a double Penning trap at the Ion-Guide Isotope Separator On-Line (IGISOL) facility. A large variety of nuclei can be produced with the fast and chemically non-selective IGISOL method for JYFLTRAP experiments. Thus far, around 270 atomic masses have been measured with a typical precision of around 10 ppb.
In this contribution, mass measurements of isomeric states will be discussed. JYFLTRAP is capable of measuring excitation energies of isomeric states with a precision of better than 10 keV provided that the excitation energy is high enough (> 100 keV) and the half-life long enough (> 100 ms). Mass-excess values of around 25 isomers have been measured with JYFLTRAP. The method is particularly important for beta-decaying isomers for which the excitation energies can be difficult to measure accurately by other means. In addition, JYFLTRAP has been used for in-trap conversion electron spectroscopy of isomeric states [1].
Isomers provide relevant information for nuclear structure and shell-model studies. They can also play a role in astrophysical processes. For example, the excitation energies of the proton-emitting high-spin isomer in 53Co [2] as well as 90Tcm (1+) [3] in the region relevant for the astrophysical rp-process have been measured at JYFLTRAP. Isomers close to doubly magic 132Sn located at the path of astrophysical r-process have also been investigated with JYFLTRAP [4]. The measured excitation energies of the 11/2- isomers in 121,123,125Cd and and 1/2- isomers in 129,131In yield new information on single-particle energies near 132Sn. A good agreement has been found between the JYFLTRAP results and the well-known excitation energies of the 7- isomers in 130Sn and 134Sb.
[1] J. Rissanen et al., Eur. Phys. J. A 34 (2007) 113.
[2] A. Kankainen et al., Phys. Rev. C 82 (2010) 034311.
[3] A. Kankainen, submitted to Eur. Phys. J. A
[4] A. Kankainen et al., to be published
Primary author
Dr
Anu Kankainen
(University of Jyväskylä)
Co-authors
Dr
Antti Saastamoinen
(University of Jyväskylä)
Prof.
Ari Jokinen
(University of Jyväskylä)
Mr
Dmitry Gorelov
(University of Jyväskylä)
Dr
Heikki Penttilä
(University of Jyväskylä)
Dr
Iain Moore
(University of Jyväskylä)
Mr
Jani Hakala
(University of Jyväskylä)
Prof.
Juha Äystö
(University of Jyväskylä)
Dr
Juho Rissanen
(University of Jyväskylä)
Dr
Sami Rinta-Antila
(University of Jyväskylä)
Dr
Tommi Eronen
(Max-Planck-Institut für Kernphysik)
Dr
Veli Kolhinen
(University of Jyväskylä)
Mr
Volker Sonnenschein
(University of Jyväskylä)
