Nuclear Structure 2026

Session

Poster Session

Jul 28, 2026, 6:00 p.m.

Fletcher Challenge Canada (Simon Fraser University Harbour Centre)

Conveners

Poster Session: Posters

• Krzysztof Starosta (SFU)

7. Beta-delayed spectroscopy at the proton drip line with RCMP at TRIUMF

Emile Cantacuzene (University of Regina)

2026-07-28, 6:00 p.m.

Posters

Nuclear $\beta$-decay is a simple and selective approach to populate excited states and obtain precise spectroscopic information. If the imbalance between proton and neutron number is large, levels in the daughter nucleus can be populated above the proton (or $\alpha$) separation energy, leading to single or multi-particle emission. These decay channels provide an opportunity to study nuclear...

10. Chiral doublet bands in $^{110,112}$Rh

Enhong Wang (Shandong University)

2026-07-28, 6:01 p.m.

Posters

High spin states of $^{110}$Rh have been reinvestigated by analyzing the high statistics γ-γ-γ and γ-γ-γ-γ coincidence data from the spontaneous fission of $^{252}$Cf using Gammasphere. A partner band with linking transition to the existing yrast band has been observed. Spins and parities are tentatively assigned according to the systematic comparison. Theoretical calculations have been...

15. The Refined Bohr-Mottelson Model for the Description of Collective Motion in Atomic Nuclei

Helena Lo (Simon Fraser University)

2026-07-28, 6:02 p.m.

Posters

A nuclear system consisting of $A$ nucleons is described in terms of $3A$ independent coordinates. Three coordinates are used in the transformation to the centre of mass frame, three Euler angles are used to set the nucleus in the body-fixed frame, and three variables $\rho$, $\beta$, and $\gamma$ define the size, orientation, and shape of the nuclear inertial ellipsoid. The remaining $3A-9$...

18. Development and characterization of SCIGA for direct reaction experiments at RAON

Dr Xesus Pereira-Lopez (CENS, IBS)

2026-07-28, 6:03 p.m.

Posters

Direct reaction experiments in inverse kinematics are one of the best suited tools to probe a broad range of nuclear properties, providing great insight into the nuclear structure of exotic nuclei. However, the inverse kinematics approach impose constraints in the experimental detection systems: charged-particles are emitted over a large angular range, hence large solid angular coverage is...

24. Investigating the boundaries of enhanced octupole collectivity in the rare-earth region

Pietro Spagnoletti (University of Liverpool)

2026-07-28, 6:04 p.m.

Posters

Atomic nuclei which exhibit a reflection-asymmetric shape are of considerable interest for the understanding of nuclear structure. These "pear-shaped" nuclei are expected to occur in the regions of the nuclear chart where the octupole degree of freedom is enhanced. Strong octupole correlations manifest when the Fermi surface lies close to single-particle orbitals with quantum numbers $[l,j]$...

28. Octopi: A Portable Versatile Gamma-ray Spectrometer

Alex Woinoski

2026-07-28, 6:05 p.m.

Posters

Studies to probe the internal structure and interactions of nuclei often require precise measurement of radiation emitted from nuclear reactions or decay. Any particular modern nuclear experiment requires unique experimental conditions, creating a demand for versatile radiation detection arrays that can meet a wide variety of experimental needs, with minimal adjustment of physical hardware....

32. FIMP: A Novel Active Implanter for Decay Spectroscopy

Jelena Vesic (Jozef Stefan Institute, Ljubljana, Slovenia)

2026-07-28, 6:06 p.m.

Posters

Decay spectroscopy at DESPEC requires an active implanter for reliable implantation–decay correlations under cocktail-beam conditions, at high rates, over a large dynamic range, and in strong background conditions. In the current DESPEC setup, AIDA serves as the workhorse implanter, but its decay-event time resolution exceeds 1 μs, and its implantation/decay-pair efficiency in real experiments...

40. Rare decay branches of A ~ 90 isomers studied with GRIFFIN using local source production

Jonathan Williams (TRIUMF)

2026-07-28, 6:07 p.m.

Posters

Modern HPGe detector arrays such as GRIFFIN and TIGRESS at TRIUMF/ISAC allow for extremely high precision $\gamma$-ray branching ratio measurements - as low as $10^{-7}$ depending on counting rate and measurement time - allowing for examination of rare decay branches. A promising avenue for pursuing these high precision measurements at TRIUMF is local production of high activity sources using...

41. High-spin intruder structures in 32Si and 29Al

Jonathan Williams (TRIUMF)

2026-07-28, 6:08 p.m.

Posters

In $sd$ shell nuclides near the N=20 'island of inversion', shell evolution is indicated by the energies of negative parity states which primarily arise due to single neutron excitation to the higher lying $fp$ orbitals. These intruder states often have high spin (due to the participation of the $0f_{7/2}$ orbital) and can therefore be preferentially populated using fusion-evaporation...

42. The N=126 Factory at Argonne National Laboratory's ATLAS Facility

Matthew Martin (Argonne National Laboratory)

2026-07-28, 6:09 p.m.

Posters

Precision nuclear data, including nuclear masses, neutron capture cross sections, and $\beta$-decay half lives, are needed throughout the $r$-process path in order to properly model nucleosynthetic pathways. One key region of the nuclear landscape which remains relatively unexplored is neutron rich nuclei surrounding the $N=126$ shell closure. This is due to the difficulty in producing these...

48. Direct measurement of single-neutron strength of 12C up to 22 MeV using the 11C(d,p) reaction.

Tsz Leung Tang (Argonne National Laboratory)

2026-07-28, 6:10 p.m.

Posters

The single-nucleon energy levels and configurations of 12C are fundamental to our understanding of nuclear structure, yet they remain primarily defined by theoretical models and parameters extrapolated from neighboring systems. As a semi-closed shell nucleus featuring complex α-cluster states, direct measurements of the excited single-particle configurations in 12C are essential for refining...

50. Re-emergence of identical bands phenomenon at normal deformation

Pramod Kumar Nayak (Bhabha Atomic Research Centre, Mumbai 400085, India & Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India)

2026-07-28, 6:11 p.m.

Posters

The rare-earth nuclei around N ~ 90 and A ~ 160 continue to present fascinating as well as challenging physics issues spanning a wide range of angular momenta. Among the many exotic phenomena characterizing nuclei in this mass region, the identical band (IB) phenomenon became a topic of intense research and discussion in the nineties. It was first identified in excited superdeformed (SD) bands...

51. Study of shape coexistence in Sr-96 via Coulomb excitation experiment

Giacomo Colombi (University of Guelph)

2026-07-28, 6:12 p.m.

Posters

In recent years, shape coexistence in atomic nuclei has been recognized as ubiquitous across the nuclear chart [1]. The structure of nuclei exhibiting shape coexistence reflects an intriguing interplay between microscopic and macroscopic nuclear effects, the understanding of which is one of the greatest challenges of modern nuclear theory. This interplay manifests in the $A\approx100$ region...

55. Ab initio study of 7Li with coupled mass partitions

Jakub Herko (TRIUMF)

2026-07-28, 6:13 p.m.

Posters

Lithium plays an important role in nuclear astrophysics, fusion energy generation, and nuclear technology. From a theoretical point of view, the nucleus $^7$Li presents a remarkable challenge, as its bound states and resonances can be understood as being formed by a $^4$He and $^3$H pair, or simultaneously, a single neutron/proton coupled to a $^6$Li/$^6$He core. In light of this complexity, a...

56. Beta-Delayed Charged-Particle Emission from 20Mg

Sydney Plante (University of Regina)

2026-07-28, 6:14 p.m.

Posters

One of the most important nuclear reactions in astrophysics is the 15O(α,γ)19Ne(p,γ)20Na reaction, which provides a possible breakout pathway from the hot CNO cycle in stars. Studying this reaction directly in the laboratory is challenging, instead, an indirect study using β-decay proton and α decays of 20Mg was performed at TRIUMF. The experiment used the Gamma-Ray Infrastructure for...

57. A data-driven approach to learning about nuclear structure

David Jenkins (University of York)

2026-07-28, 6:15 p.m.

Posters

Historically, students entering the field of nuclear structure learn about the topic through encountering models. Often, the order in which models are presented echoes the chronology of discoveries within the topic. Students are then provided with one or two selected examples of nuclear data which strongly support a particular model. In this way, they often fail to achieve a wider...

67. Decay Spectroscopy of 161Eu with the GRIFFIN Spectrometer

Jizhong Liu (TRIUMF/UVic)

2026-07-28, 6:16 p.m.

Posters

The neutron-rich Gadolinium isotopes around mass A=160 represent a critical region for understanding both nuclear structure and astrophysical nucleosynthesis. These nuclei exhibit large prolate deformations and lie along the freeze-out path of the rapid neutron capture process (r-process). Understanding their structure can give insight into the rare-earth abundance peak formation. The...

68. Beyond Sphericity in a Semi-Magic Nucleus: Multiple Shape Coexistence in $^{116}$Sn

Marco Siciliano (Argonne National Laboratory)

2026-07-28, 6:17 p.m.

Posters

The evolution of nuclear shapes and the phenomenon of shape coexistence lie at the heart of our understanding of nuclear structure and the effective nuclear interaction. While dramatic examples of shape coexistence have long been established near closed shells, semi-magic nuclei have traditionally been regarded as structurally simple systems, dominated by pairing correlations and spherical...

71. Mirror energy differences in $T_z=\mp3/2$ nuclei $^{45}$Cr and $^{45}$Sc

Denise Lazzaretto (University of Jyväskylä)

2026-07-28, 6:18 p.m.

Posters

Isospin symmetry implies that the nuclear force acts in the same way between proton-proton, neutron-neutron and proton-neutron pairs in the atomic nucleus. To probe this symmetry, it is possible to study the so-called "mirror nuclei" that have interchanged numbers of protons and neutrons and thus should have analogous structures. Leaving aside the Coulomb interaction, the difference in...

75. Lifetime measurements of excited states of $^{210}$Pb and $^{200}$Pt applying the two-neutron transfer reaction*

Mr C.M. Nickel (Institute for Nuclear Physics, Dept. of Physics, Technische Universität Darmstadt, Darmstadt, Germany)

2026-07-28, 6:19 p.m.

Posters

Low-spin and low-energy observables give access to the underlying nuclear structure of atomic nuclei. Moderately neutron-rich radioactive isotopes can efficiently be provided by the ($^{18}$O, $^{16}$O) two-neutron transfer reaction. The population of low-spin excited states allows measurements of their $\gamma$-ray coincidences and lifetimes, hence, electromagnetic matrix elements.
Improved...

76. Emergence of quadrupole collectivity near shell closures

Hannes Mayr

2026-07-28, 6:20 p.m.

Posters

Quadrupole collectivity near shell closures dominates the structure of low-lying excited states. The $B_{4/2}=\frac{B(E2;\, 4_1^+\to2_1^+)}{B(E2;\, 2_1^+\to0_1^+)}$ ratio as a measure of collectivity takes benchmark values in the collective limits of a spherical harmonic vibrator with $B_{4/2}^{\text{vib}}= 2$, or quadrupole-deformed limits with $B_{4/2}^{\text{rot}} = 1.43$, regardless of...

81. Probing the s-process via Exclusive Indirect Measurement of the $^{22}Ne(\alpha, \gamma)^{26}Mg$ Reaction

Mike Qiu (TRIUMF)

2026-07-28, 6:21 p.m.

Posters

The slow neutron capture process (s-process) creates almost half of the elements heavier than iron in the universe. One of the most important neutron sources for the s-process is the $^{22}Ne(\alpha, n) ^{25}Mg$ reaction, which competes with the $^{22}Ne(\alpha, \gamma) ^{26}Mg$ reaction. The current nuclear data for these reactions show great discrepancies. Thus, in order to understand the...

82. Measuring 39K(3He,α)38K with GODDESS to search for energy levels in 38K important for the 37Ar(p,γ)38K reaction rate

Ashwin Nagarajan

2026-07-28, 6:22 p.m.

Posters

The 37Ar(p,γ)38K reaction plays a critical role in determining the abundances of several stable isotopes at the endpoint of rp-process nucleosynthesis in novae. To inform the astrophysical reaction rate of proton capture on 37Ar and guide any future direct measurements, a better understanding of the 38K energy levels above the 37Ar+p threshold is essential. Experimentally, these excited states...

83. Excitation energies of the low-lying isomeric states in 100-Y and 102-Y

A.M. Bruce (University of Brighton)

2026-07-28, 6:23 p.m.

Posters

Beta-decaying, spin-trap isomers have been observed in $^{96}$Y, $^{98}$Y and $^{100}$Y with half-lives ranging from 9 to 0.7 seconds [Ab08,Ch20,Si21]. A recent paper [Ca25] has investigated the isomeric-yield ratio in production of all three in fission and observed that, in $^{96}$Y and $^{100}$Y it is the higher-spin state which is populated more strongly, whereas in $^{98}$Y the opposite...

84. Nuclear structure of 94Pd at transition-point between the isoscalar and isovector characteristics

Youngseub Jang (Korea University, Center for Exotic Nuclear Studies, Institute for Basic Science)

2026-07-28, 6:24 p.m.

Posters

Nuclei near the doubly magic nucleus $^{100}$Sn ($N=Z=50$) have been extensively studied to investigate nuclear structure, including shell evolution, seniority effects, and proton–neutron interactions. In this work, $^{94}$Pd with $N=Z+2$ was investigated with a focus on isovector($T=1$) and isoscalar($T=0$) neutron-proton pairing using the fast-timing measurement. Half-lives of yrast excited...

85. Enabling Systematic Nuclear Structure Studies Through Automated Level-Scheme Construction

Samantha Buck (University of Guelph)

2026-07-28, 6:25 p.m.

Posters

Recent decades have witnessed exponential growth in both the quality and volume of experimental nuclear data, driven by advancements in detector technologies and accelerator capabilities. Gamma-ray spectroscopy has particularly benefited from these improvements, with large-scale spectrometers such as GRIFFIN and TIGRESS at TRIUMF enabling collection of increasingly complex, high-dimensional...

89. Level Structure and Electromagnetic Transition Character in 158Er from Beta Decay of 158Tm

Abraham Avaa (TRIUMF)

2026-07-28, 6:26 p.m.

Posters

In nuclei near N∼90, low-lying level schemes often contain several unplaced transitions, and many excited states lack definitive spin and multipolarity assignments. This limits the extraction of electromagnetic matrix elements and hinders detailed interpretation of configuration mixing and nuclear structure. The structure of 158Er has been investigated following the β decay of 158Tm using the...

97. Neutron capture resonance structure and cross section measurements of 243Am

Wanpeng Tan

2026-07-28, 6:27 p.m.

Posters

The long-term management of high-level nuclear waste will necessarily involve the transmutation of highly radioactive materials using accelerator-driven systems converting long lived radioactive waste products into short-lived or stable nuclei. Am is the most abundant, long lived radioactive product in high-level nuclear waste, but the neutron capture cross section is known with high-level...

102. Structure of Neutron-Rich $^{33,34,35}$Mg from $\beta$ Decay Studies

Dr Smain Sekal (Tennesse tech university)

2026-07-28, 6:28 p.m.

Posters

The structure of neutron-rich magnesium isotopes in the vicinity of the so-called Island of Inversion provides a sensitive testing ground for nuclear models and shell evolution far from stability. In this work, we investigate the $\beta$ decay of $^{33,34,35}\mathrm{Mg}$ using high-efficiency $\gamma$-ray spectroscopy in combination with $\beta$ tagging. The experiment was performed using the...

105. Insight on shape coexistence in $^{100}$Zr through lifetime measurements at GRIFFIN

Konstantin Stoychev (University of Guelph)

2026-07-28, 6:29 p.m.

Posters

The sudden onset of deformation in $A\approx100$ nuclei at $N=60$ has been described as a ground-state shape transition that has raised a lot of interest over the years from an experimental and theoretical point of view [1]. This transition is most pronounced in the Zr and Sr isotopic chains where the low-energy excited-state structure shows significant signs of deformation developing at...

111. Study of Multiple Shape Coexistence in 110Cd

Samantha Lange (University of Guelph)

2026-07-28, 6:30 p.m.

Posters

Cd isotopes, particularly $^{110,112}$Cd, have long been considered the best examples of nuclei with vibrational behaviour. However, recent studies challenge this interpretation, suggesting that Cd isotopes possess characteristics of multiple shape coexistence. To further investigate this issue, a series of $\beta$-decay experiments were conducted to improve the spectroscopic information on...

113. Coulomb excitation of 110Cd studied with AGATA at LNL

Iwona Piętka (Heavy Ion Laboratory, University of Warsaw, Poland)

2026-07-28, 6:31 p.m.

Posters

For several decades, stable even-mass Cd isotopes have been considered to be textbook examples of multiphonon spherical vibrators [1] based on the excitation energy pattern of their low-lying states. However, a detailed study of $^{110}$In $\beta$ decay and subsequent beyond-mean-field theoretical calculations [2-6] suggested instead the presence of multiple shape coexistence in the...

114. Towards determination of distribution of magnetization in 48K using b- NMR technique and nuclear DFT approach

Anu Nagpal (University of York, UK)

2026-07-28, 6:32 p.m.

Posters

Following the N=28 shell closure, a noticeable change in the slope of the charge radii, often called a "kink", has been observed in neutron-rich calcium isotopes [1,2]. However, the exact size of this kink and its underlying causes remain unclear. Theoretical predictions suggest that several factors might contribute to this behavior, including the presence of large nuclear deformations or...

121. Experimental Study of Low-Spin States in $^{42}$Ca and $^{44}$Ca as a Probe for Shape Coexistence

Massimiliano Luciani (Università degli Studi di Milano, INFN Sezione di Milano)

2026-07-28, 6:33 p.m.

Posters

Nuclear shape coexistence plays a crucial role in understanding the microscopic origin of nuclear deformation [1-4].
In this respect, the Ca isotopic chain between the shell closures at N=20 and N=28 is an optimal test
area where different theoretical approaches can be used and their predictions compared with experimental data (\textit{e.g.} large-scale Shell Model calculations, Density...

127. Probing Spin-Triplet Pairing Through Nuclear Mass Measurements

Alec Cannon (University of Victoria)

2026-07-28, 6:34 p.m.

Posters

Nuclear masses are fundamental observables that give insight into nuclear structure, fundamental interactions, and astrophysics. Pairing gaps are an experimental observable that can be extracted from nuclear mass data and can show exotic nuclear behavior, especially for odd-even staggering and pairing effects. These pairing gaps can also provide information about nuclear deformation and the...

128. Measurement of the 18O(α, γ)22Ne reaction to constrain the structure properties of 22Ne resonances

Dhruval Shah (McMaster University)

2026-07-28, 6:35 p.m.

Posters

Half of the elements heavier than iron in the universe are synthesized by the slow
neutron capture process ($s$-process), which occurs in asymptotic giant branch (AGB)
stars and in massive stars. The $^{18}$O(α, γ)$^{22}$Ne reaction is a key link in determining
the availability of $^{22}$Ne in the stellar environment, which affects the amount of neutrons
available for the s-process through...

130. Target Fragmentation in Hadron Therapy: direct and inverse kinematic measurements

Giuliana Galati (Università di Bari Aldo Moro & INFN Bari)

2026-07-28, 6:36 p.m.

Posters

Particle therapy with protons and heavy ions relies on a precise understanding of nuclear interactions in tissue. In this context, nuclear fragmentation processes, in particular target and beam fragmentations, play a crucial role, producing secondary fragments with high linear energy transfer and impacting dose deposition and radiobiological effectiveness. However, at present fragmentation...

131. Fusion-evaporation Cross-section Measurements Near 56Ni Using TIP and TIGRESS at TRIUMF

Heinz Asch (Simon Fraser University)

2026-07-28, 6:37 p.m.

Posters

The study of exotic, short-lived nuclei far from the valley of stability is crucial for the exploration of nuclear structure and nucleosynthesis. To fulfill these pursuits, fusion-evaporation reactions serve as an essential reaction mechanism for accessing exotic nuclei such as those near the proton drip line. However, the tools available for predicting fusion-evaporation reaction...

132. Coupling of TIGRESS and EMMA with Auxiliary Array TIP at TRIUMF

Heinz Asch (Simon Fraser University)

2026-07-28, 6:38 p.m.

Posters

Work has been conducted at TRIUMF, Canada's particle accelerator centre, to combine the capabilities of the TRIUMF-ISAC Gamma-Ray Escape Suppressed Spectrometer (TIGRESS) for gamma-rays, the CsI Ball array in the TIGRESS Integrated Plunger (TIP) for charged particles, and the ElectroMagnetic Mass Analyzer (EMMA) for recoil-mass spectrometry. This trio allows for an entirely new suite of...

133. Characterization of high-spin states in neutron-rich Au isotopes near N=126: Regularities and inheritances

Youngju Cho (Argonne National Laboratory)

2026-07-28, 6:39 p.m.

Posters

The interplay between single-particle and collective degrees of freedom in atomic nuclei constitutes a fundamental aspect in quantum many-body physics, particularly manifest in odd-nucleon systems where unpaired nucleons couple to the even-even core. The region southwest of 208Pb offers a rich landscape for such studies. For example, across the Au isotopic chain, isomeric bands based on πh11/2...

136. Developments for nuclear structure studies of heavy nuclides using the mass spectrometer SHIPTRAP

Briain Hartigan (JGU Mainz)

2026-07-28, 6:40 p.m.

Posters

Super-heavy elements (Z > 103) owe their existence to nuclear shell effects and deformations of the nucleus, which stabilize the nucleus against Coulomb repulsion [1]. Direct mass measurements of isotopic and isobaric chains of these nuclides using Penning traps [2] can quantify the strength of these nuclear shell effects, allowing us to map nuclear shell evolution. Additionally, precise mass...

142. Precision mass measurement of barium isotopes and implications for double beta decay

Brian Kootte

2026-07-28, 6:41 p.m.

Posters

Double $\beta$ (2$\beta$) and double electron capture (ECEC) decays are active areas of research, and confirmation of a neutrinoless decay channel would identify the neutrino as a Majorana particle. The half-lives of these decay modes depend sensitively on the masses of the parent and daughter isotopes as the Q-value determines both the resonant enhancement of neutrinoless ECEC decays [1] and...

144. Study of key $^{57}$Ni(p,$\gamma$)$^{58}$Cu resonances and their impact on nucleosynthesis in supernovae

Scott Carmichael (Argonne National Laboratory)

2026-07-28, 6:42 p.m.

Posters

The $^{57}$Ni(p,$\gamma$)$^{58}$Cu reaction rate significantly impacts nucleosynthesis in various astrophysical sites. Perhaps most importantly, it impacts the production of the observable isotope $^{44}$Ti in core-collapse supernovae (CCSNe). Despite the importance of this reaction, no experimental rate previously existed for $^{57}$Ni(p,$\gamma$)$^{58}$Cu. To experimentally constrain this...

147. Coupled Alpha/Beta/Gamma Detection at SFU with SCI-CASTER and the 8Pi Spectrometer

Andrew Redey (Simon Fraser University)

2026-07-28, 6:43 p.m.

Posters

The Simon Fraser University Nuclear Science Laboratory (NSL) is home to the SCI-CASTER project, which aims to develop position-sensitive ionization chamber detector technologies for precision charged particle measurements. Modern waveform digitization and analysis methods enable this by allowing for the direct application of the Shockley-Ramo theorem to the induced charge signals of the...

151. Benchmarking Interaction Ordering in GRETINA Using Doppler-Corrected Energies and Linear Polarization

Nick Coldiron (University of Massachusetts Lowell)

2026-07-28, 6:44 p.m.

Posters

Accurate identification of γ-ray interaction sequences in highly segmented HPGe detector arrays is critical for extracting nuclear structure observables. In particular, the determination of the first and second interaction points directly impacts Doppler correction and linear polarization measurements. However, ambiguities in interaction ordering remain a key limitation in current analysis...

153. Probing transitional structure and collectivity in neutron-deficient 158Er

Yiyi Zhu

2026-07-28, 6:45 p.m.

Posters

The rare-earth region provides an ideal testing ground for nuclear structure evolution, where enhanced collectivity and low-lying 0⁺ states challenge simple models and require additional degrees of freedom such as triaxial and octupole deformation. Much of the existing experimental data, however, is concentrated in the stable Nd–Dy region, and it remains unclear whether these models...

154. Development of an Ion Transport and Identification System for Barium Tagging in Liquid Xenon Neutrinoless Double Beta Decay Experiments

Hussain Rasiwala (McGill University)

2026-07-28, 6:46 p.m.

Posters

Neutrinoless double beta decay ($0\nu\beta\beta$) is a hypothetical, lepton-number-violating process which, if observed, would confirm the Majorana nature of the neutrino. A proposed next-generation experiment searching for this decay in liquid xenon (LXe) is nEXO, anticipated to deploy 5 tonnes of LXe enriched to 90% in the double beta decay ($2\nu\beta\beta$) isotope $^{136}$Xe, targeting a...

156. In-source laser spectroscopy of ground- and isomeric states of neutron-rich polonium with LIST

Julius Wessolek (TRIUMF)

2026-07-28, 6:47 p.m.

Posters

The Isotope Separator On Line DEvice (ISOLDE) is a facility for the production and study of radioactive ion beams at CERN. The Laser Ion Source and Trap (LIST) of the Resonance Ionization Laser Ion Source (RILIS) enables access to isotopes that otherwise suffer from strong isobaric contamination [1,2].
We report the continued study of neutron-rich polonium ($Z=84$) isotopes through in-source...

159. Towards a Revised Picture of Octupole Structure in Neutron-Rich $^{148}$Ba

Silvia Murillo Morales (TRIUMF)

2026-07-28, 6:48 p.m.

Posters

Octupole deformation in Barium isotopes has been experimentally established up to $N$=90 [1,2], with more recent evidence extending this behavior up to $N$=94. Symmetry-conserving configuration mixing (SCCM) calculations confirm an evolution toward increasingly quadrupole-deformed shapes accompanied by sustained octupole correlations in this region[3].

New spectroscopic information was...

160. Precision Mass Measurements of Neutron-Rich Sb Isotopes and Structure Evolution Beyond N=82

Pavithra Weligampola (TRIUMF)

2026-07-28, 6:49 p.m.

Posters

The neutron-rich Sb isotopes beyond the N=82 shell closure provide a sensitive testing ground for nuclear structure far from stability. Precision mass measurements in this region are key inputs for studying neutron pairing, the evolution of two-neutron separation energies, and the possible emergence of a subshell closure at N≈90.
The Multiple-Reflection Time-of-Flight Mass Spectrometer...

120. Critical need for DSAM lifetime re-evaluations

Gregory Lane (The Australian National University)

Posters

The structure of $fp$ shell nuclei has been the subject of intensive study for many decades. These nuclei remain of crucial importance because they provide a foundation for studies of neutron-rich nuclei currently being investigated at facilities such as FRIB (e.g. [1]). Within the $fp$ shell, large-basis shell model calculations, wherein both protons and neutrons occupy the $0f_{7/2}$,...