Low-lying states in the isotope Xe130 were populated in a Coulomb-excitation experiment performed at CERN's HIE-ISOLDE facility. The magnitudes and relative signs of seven E2 matrix elements and one M1 matrix element coupling five low-lying states in Xe130 were determined using the semiclassical coupled-channel Coulomb-excitation least-squares search code gosia. The diagonal E2 matrix elements of both the 21+ and 41+ states were extracted for the first time. The reduced transition strengths are in line with those obtained from previous measurements. Experimental results were compared with the general Bohr Hamiltonian with the microscopic input from mean-field theory utilizing universal nuclear energy density functional (UNEDF0), shell-model calculations using the GCN50:82 and SN100PN interactions, and simple phenomenological models (Davydov-Filippov and γ-soft). The extracted shape parameters indicate triaxial-prolate deformation in the ground-state band. In general, good agreement between theoretical predictions and experimental values was found, while neither phenomenological model was found to provide an adequate description of Xe130. (Less)

Quadrupole deformation of Xe 130 measured in a Coulomb-excitation experiment

Excited states in 125Te have been populated via the 122Sn(9Be, α2nγ) fusion-evaporation reaction. The positive parity band has been extended up to by placing a 693 keV γ-transition. Spin and parity of several excited states have been confirmed by the present spectroscopic measurements. has been assigned to the 2569 keV state firmly, which is a possible candidate for a nanosecond isomer in the chain.

Search for the 23/2+ isomeric state in 125 Te

pdf/correlations-between-nuclear-schiff-moment-and-1zl1thuk.pdf

Correlations between nuclear Schiff moment and electromagnetic measurements

In this work, the characteristics of \begin{document}$2\nu\beta\beta$\end{document} decays for six nuclei ( \begin{document}$^{36}$\end{document} Ar, \begin{document}$^{46}$\end{document} Ca, \begin{document}$^{48}$\end{document} Ca, \begin{document}$^{50}$\end{document} Cr, \begin{document}$^{70}$\end{document} Zn, and \begin{document}$^{136}$\end{document} Xe) in a mass range from \begin{document}$A = 36$\end{document} to \begin{document}$A = 136$\end{document} are studied within the nuclear shell model (NSM) framework. Calculations are presented for the half-lives, nuclear matrix elements (NMEs), phase space factors ( \begin{document}$G_{2\nu}$\end{document} ), and convergence of the NMEs. The theoretical results agree well with the experimental data. In addition, we predict the half-lives of \begin{document}$2\nu\beta\beta$\end{document} decays for four nuclei. We focus on the convergence of the NMEs by analyzing the number of contributing intermediate \begin{document}$1^{+}$\end{document} states ( \begin{document}$N_{\rm{C}}$\end{document} ) for the nuclei of interest. We assume that \begin{document}$N_{\rm{C}}$\end{document} is safely determined when the accumulated NMEs saturate 99.7% of the final calculated magnitude. From the calculations of the involved nuclei, we discover a connection between \begin{document}$N_{\rm{C}}$\end{document} and the total number of intermediate \begin{document}$1^{+}$\end{document} states ( \begin{document}$N_{\rm{T}}$\end{document} ). According to the least squares fit, we conclude that the correlation is \begin{document}$N_{\rm{C}}=\left( 10.8\pm 1.2\right) \times N_{\rm{T}}^{\left( 0.29\pm 0.02\right)}$\end{document} .

https://iopscience.iop.org/article/10.1088/1674-1137/abba13/pdf

Research on convergence of the nuclear matrix elements for 2νββ decays

The transitional nuclei $^{134}$Ba and $^{133}$Ba are investigated after multinucleon transfer employing the high-resolution Advanced GAmma Tracking Array coupled to the magnetic spectrometer PRISMA at the Laboratori Nazionali di Legnaro, Italy, and after fusion-evaporation reaction at the FN tandem accelerator of the University of Cologne, Germany. The Jπ=19/2+ state at 1942 keV in $^{133}$Ba is identified as an isomer with a half-life of 66.6(20)ns corresponding to a B(E1) value of 7.7(4)×10−6e2fm2 for the Jπ=19/2+ to Jπ=19/2− transition. The level scheme of $^{134}$Ba above the Jπ=10+ isomer is extended to approximately 6 MeV. A pronounced backbending is observed at ℏω=0.38 MeV along the positive-parity yrast band. The results are compared to the high-spin systematics of the Z=56 isotopes. Large-scale shell-model calculations employing the GCN50:82, SN100PN, SNV, PQM130, Realistic SM, and EPQQM interactions reproduce the experimental findings and elucidate the structure of the high-spin states. The shell-model calculations employing the GCN50:82 and PQM130 interactions reproduce alignment properties and provide detailed insight into the microscopic origin of this phenomenon in transitional $^{134}$Ba.

/pdf/isomer-spectroscopy-in-ba-133-and-high-spin-structure-of-ba-3hwtva5hu5.pdf

Isomer spectroscopy in Ba-133 and high-spin structure of Ba-134

The high-spin structures of 136Ba and 137Ba are investigated after multinucleon-transfer (MNT)
and fusion-evaporation reactions. 136Ba is populated in a 136Xe+238U MNT reaction employing the
high-resolution Advanced GAmma Tracking Array (AGATA) coupled to the magnetic spectrometer
PRISMA at the Laboratori Nazionali di Legnaro, Italy, and in two 9Be + 130Te fusion-evaporation
reactions using the High-efficiency Observatory for 
-Ray Unique Spectroscopy (HORUS) at the
FN tandem accelerator of the University of Cologne, Germany. Furthermore, both isotopes are
populated in an elusive reaction channel in the 11B+130Te fusion-evaporation reaction utilizing the
HORUS 
-ray array. The level scheme above the J� = 10+ isomer in 136Ba is revised and extended
up to an excitation energy of approx. 5.5 MeV. From the results of angular-correlation measurements,
the Ex = 3707- and Ex = 4920-keV states are identified as the bandheads of positive- and
negative-parity cascades. While the high-spin regimes of both 132Te and 134Xe are characterized
by high-energy 12+ ! 10+ transitions, the 136Ba E2 ground-state band is interrupted by negativeparity
states only a few hundred keV above the J� = 10+ isomer. Furthermore, spins are established
for several hitherto unassigned high-spin states in 137Ba. The new results close a gap along the highspin
structure of N < 82 Ba isotopes. Experimental results are compared to large-scale shell-model
calculations employing the GCN50:82, Realistic SM, PQM130 and SN100PN interactions. The calculations
suggest that the bandheads of the positive-parity bands in both isotopes are predominantly
of proton character.

/pdf/identification-of-high-spin-proton-configurations-in-ba136-28mj05p1vr.pdf

Identification of high-spin proton configurations in Ba136 and Ba137

Detailed information on isomeric states in A ≈ 135 nuclei is exploited to benchmark shell-model
calculations in the region northwest of doubly-magic nucleus 132Sn. The N = 79 isotones 133Xe and
135Ba are studied after multinucleon transfer (MNT) in the 136Xe + 208Pb reaction employing the
high-resolution Advanced GAmma Tracking Array (AGATA) coupled to the magnetic spectrometer
PRISMA at the Laboratori Nazionali di Legnaro, Italy and in a pulsed-beam experiment at the FN
tandem accelerator of the University of Cologne, Germany utilizing a 9Be+130Te fusion-evaporation
reaction at a beam energy of 40 MeV. Isomeric states are identified via delayed 
γ-ray spectroscopy.
Hitherto tentative excitation energy, spin, and parity assignments of the 2107-keV Jπ = 23/2+
isomer in 133Xe are confirmed and a half-life of T1/2 = 8.64(13) ms is measured. The 2388-keV
state in 135Ba is identified as a Jπ = 23/2+ isomer with a half-life of 1.06(4) ms. The new results
show a smooth onset of isomeric Jπ = 23/2+ states along the N = 79 isotones and close a gap
in the high-spin systematics towards the recently investigated Jπ = 23/2+ isomer in 139Nd. The
resulting systematics of M2 reduced transition probabilities is discussed within the framework of the
nuclear shell model. Latest large-scale shell-model calculations employing the SN100PN, GCN50:82,
SN100-KTH, and a realistic effective interaction reproduce the experimental findings generally well
and give insight into the structure of the isomers.

/pdf/millisecond-23-2-isomers-in-the-n-79-isotones-133xe-and-1ezhxf3b8l.pdf

Millisecond 23/2+ isomers in the N = 79 isotones 133Xe and 135Ba

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Identification of high-spin proton configurations in Ba136 and Ba137

Millisecond 23/2+ isomers in the N = 79 isotones 133Xe and 135Ba