-
Xinyi Wang (Michigan State University)Poster PresentationsPoster
This work was partly supported by the U.S. National Science Foundation awards NSF PHY-1565546, NSF PHY-1936404, NSF PHY-2011265, NSF PHY-2011398, and NSF PHY-2012040.
Go to contribution page
Spectroscopy of neutron unbound 13Be can provide insights into the unexpected structural changes of neutron-rich nuclei around N=8. Invariant mass spectra from past experiments do not agree on the location of the... -
Dr Nabin Rijal (FRIB, Michigan State University)Poster PresentationsOral
In light nuclei, the quantum states formed near the cluster-separation threshold favor a large degree of cluster configurations. The $^{10}$Be is a well-known cluster nucleus, with a set of states having very large $\alpha$ widths and very small neutron strengths, consistent with the valence neutrons orbiting around the 2-$\alpha$ cores. The cluster decay branching ratios and cluster content...
Go to contribution page -
Yiyi Zhu (UMass Lowell)Poster PresentationsOral
Historically, the N=20 region of the nuclear chart has played a significant role in our understanding of nuclear structure. In this mass region, deformed excited states from neutron occupations in the νf7/2 orbital are observed to compete with normal configurations in the sd-shell leading to so-called intruder-states. Interestingly, this large evolution of shell structure is not a...
Go to contribution page -
Tomás R. Rodríguez (Universidad Autónoma de Madrid)Poster PresentationsOral
Beta-decay rates are key quantities to understand both nuclear structure properties as well as the dynamics of nucleosynthesis processes. However, microscopic calculations based on the evaluation of nuclear matrix elements using eigenstates of the mother and daughter nuclei separately are scarce.
Go to contribution page
From a beyond-mean-field point of view, one of the main problems is the evaluation of the... -
Kevin Siegl (University of Tennessee, Knoxville)Poster PresentationsOral
Beta-decay strength measurements are required to constrain the nuclear models, which aim to predict nuclear lifetimes and decay branching ratios. Recently, this became an important research topic, especially for neutron-rich nuclei, relevant to the r-process. We studied beta delayed neutron emission of neutron-rich cobalt isotopes to (Z=28) nickel nuclei to complete the strength distribution...
Go to contribution page -
Ruchi Mahajan (Facility for Rare Isotope Beams, Michigan State University)Poster PresentationsOral
The 15O(α,γ)19Ne breakout reaction from the hot CNO cycles is significant to the thermonuclear runaway that causes type I X-ray bursts on accreting neutron stars. At breakout temperatures (≈0.5GK), this reaction is strongly dominated by a single resonance with center of mass energy 506 Kev corresponding to a 19Ne state having excitation energy of 4.03 MeV. An experimental upper limit has been...
Go to contribution page -
Mr Jeffrey Maggio (SkuTek Instrumentation)Poster PresentationsPoster
Skutek Instrumentation excels in development of multichannel, high-performance digitizers described in the companion poster. Data readout is facilitated through 10G optical or 1G copper Ethernet from each individual device. High-volume data streams are received by Data Collection Computers followed by Data Transfer Nodes, and buffered on local high-capacity disk arrays. The data sets will be...
Go to contribution page -
Frank (Tongan) Wu (Simon Fraser University)Poster PresentationsOral
At TRIUMF, Canada’s particle accelerator centre, the TIGRESS Integrated Plunger (TIP) and its configurable detector systems have been used for charged-particle tagging and light-ion identification in Doppler-shift lifetime measurements using gamma-ray spectroscopy with the TIGRESS array of HPGe detectors. An experiment using these devices to measure the lifetime of the $2^+_1$ state of...
Go to contribution page -
Matthew Martin (Simon Fraser University)Poster PresentationsOral
Neutron rich Mg isotopes far from stability belong to the island of inversion, a region where the configuration of single-particle nucleon states becomes inverted with respect to the predicted ordering of the spherical shell model. Nuclei in this region also exhibit collective behaviour in which multiple particle interactions play a significant role in nuclear wavefunctions and transitions....
Go to contribution page -
Alexander Voinov (Ohio University)Poster PresentationsOral
The nuclear level density is an important input in nuclear reaction codes to calculate reaction cross sections. Experimental data are limited and theoretical models suffer from large uncertainties. This motivates further experimental studies.
The data on the level density and the spin cutoff parameter for the $\rm ^{59}Ni$ isotope were obtained from the analysis of the angular distribution...
Go to contribution page -
Samuel Ajayi (Florida State University)Poster PresentationsOral
Fusion evaporation reaction induced by a beam of 43MeV $^{14}$C on $^{48}$Ti and $^{50}$Ti targets has been used to populate the high spin levels in $^{59}$Co and $^{61}$Co. Emitted γ rays were detected using the FSU clover array which consists of 6 high purity germanium clover detectors (with BGO shields for Compton suppression) and a few single-crystal detectors all placed at 3 different...
Go to contribution page -
Marilena Lykiardopoulou (TRIUMF)Poster PresentationsOral
Alpha-, beta-, and proton-decay energies have been combined with TITAN mass values for 150−157Yb to expand and refine the mass surface in the proton-rich Z = 70 − 82 region. The calculations were performed using the Atomic Mass Evaluation (AME) algorithm. As a result, a total of 11 new ground state masses were accordingly determined while the uncertainties were reduced by more than...
Go to contribution page -
David Jenkins (University of York)Poster PresentationsOral
Carbon burning is a key step in the evolution of massive stars, Type 1a supernovae and superbursts in x-ray binary systems. Determining the $^{12}$C+$^{12}$C fusion cross section at energies relevant to these different astrophysical scenarios by extrapolation of direct measurements is challenging due to resonances at and below the Coulomb barrier.
A study of the $^{24}$Mg(α,α′)$^{24}$Mg...
Go to contribution page -
Shree Neupane (University of Tennessee)Poster PresentationsOral
An efficient neutron detection system with good energy resolution is
Go to contribution page
needed to characterize decays of neutron-rich nuclei where beta-delayed
neutron emission is a dominant decay mode. Precision neutron
spectroscopy probes nuclear structure effects in neutron-rich nuclei and
is essential to exploit the opportunities in new generation radioactive
beam facilities. A new high-resolution... -
Eun Jin InPoster PresentationsOral
Exotic nuclei with large proton or neutron excess are of intense current interest due to their potential to exhibit unusual properties and their importance in reactions for astrophysical simulations. Shape changes, modified shell closures, and the emergence of new modes of excitation are among the phenomena of interest to both nuclear structure and reaction theories. Developing improved...
Go to contribution page -
Wojtek Skulski (SkuTek Instrumentation)Poster PresentationsPoster
SkuTek Instrumentation excels in development of multichannel, high performance digitizers for Nuclear Physics, Particle Physics, and related fields. Our digitizers feature up to 32 channels with low noise and high sampling rates of 100 MSPS @ 14 bits. The data readout is performed individually from each digitizer with a front end 1 G Ethernet connector. The optional back end optical fiber...
Go to contribution page -
William WaltersPoster PresentationsOral
The neutron-rich Z = 32 Ge nuclei are an abundant source of challenges for nuclear structure physics, ranging from demonstrated triaxiality in Ge-76,78. [1,2] through debatable particle-hole structure and strong prolate deformation in Ge-80 [3,4,5] to the N = 50 closed-shell Ge-82. The structure of Ge-81, with a single hole in the N = 50 closed shell, is also remarkable, inasmuch as only a...
Go to contribution page -
Mr Luca Zago (INFN LNL and University of Padova)Poster PresentationsPoster
Due to the rather scarcity of spectroscopic data on the trans-fermium region, high-spin studies in the few-particles/holes around the Z = 82, N=126 double-shell closure, populating the same high-$j$ orbitals, can provide complementary and crucial information about the single-particle level structure of these nuclei.
Go to contribution page
A particularly rich phenomenology also arises around the lead double shell... -
Emanuel Chimanski (LLNL)Poster PresentationsOral
Inelastic scattering is widely used to determine nuclear structure properties, but can also provide valuable (indirect) information on nuclear reaction cross-sections. Understanding the origin of heavy elements, for example, requires knowledge of neutron capture cross-sections for many exotic isotopes.
Go to contribution page
In addition to that, nuclear reactions play a key role in modern applications such as... -
Ms Sanjanee Waniganeththi (University of Massachusetts Lowell)Poster PresentationsPoster
Properties of proton-emitting nuclei along the $N \sim Z$ line in the vicinity of the proton dripline, can be a useful probe of nuclear structure. In particular, the ground-state spins of the $^{71}$Kr/$^{71}$Br mirror pair have been under debate for several decades driven primarily by the closely spaced (E$_{x}$ = 10 keV) first-excited state in the $^{71}$Br mirror partner [1,2]....
Go to contribution page -
Mr I Ahmed (Nuclear Physics Group, Inter-University Accelerator Centre, New Delhi - 110067)Poster PresentationsOral
A series of multi-step coulomb excitation experiments were carried out at GDA laboratory of IUAC New Delhi in order to investigate the low-lying electromagnetic nuclear structure of $^{64,68,70}$Zn nuclei, wherein the available information is rather diluted. The reduced transition strength B(E2; $4_{1}^+ \rightarrow 2_{1}^+$) and B(E2; $2_{1}^+ \rightarrow 0_{1}^+$) in few Zn-isotopes shows a...
Go to contribution page -
J. C. Batchelder (U. California Berkeley)Poster PresentationsOral
The $\beta$-decay of $^{125m,125}$Ag into levels in $^{125}$Cd was investigated at the Holifield Radioactive Ion Beam Facility (HRIBF). Uranium-238 targets were bombarded with 50-MeV protons
Go to contribution page
with an intensity of 15 $\mu$ A, and the induced fission products were mass separated and deposited on a moving tape in the center of the VANDLE array consisting of $\gamma$-detectors and plastic... -
Andrew Wantz (Michigan State University/FRIB)Poster PresentationsPoster
A. Wantz, Michigan State University -- Particle identification is a critical task when performing measurements involving rare isotope beams. Invariant mass spectroscopy for the study of neutron-unbound states, the focus of the MoNA Collaboration, requires that the fragments resulting from the decay of the unbound states be accurately identified. These measurements necessitate deconvolving the...
Go to contribution page -
Bertis Rasco (Oak Ridge National Laboratory)Poster PresentationsOral
Experimental nuclear physicists are well acquainted with the ubiquitous 1461 keV background $\gamma$ ray from the first-forbidden unique electron-capture decay of $^{40}$K to $^{40}$Ar. The third-forbidden unique beta decay to the $^{40}$Ca ground state is also well known. Not so well known is the third-forbidden unique electron-capture decay channel directly to the $^{40}$Ar ground state....
Go to contribution page -
Mr Heinz Asch (TIP and TIGRESS Collaboration)Poster PresentationsOral
Experiment S1758 aims to explore the charge dependence of the strong nuclear interaction by probing 55Ni and 55Co near the doubly magic 56Ni. This will be achieved by impinging beams of radioactive 20Na and stable 20Ne upon 40Ca targets to produce 55Ni and 55Co, respectively. Charged particles and γ-rays will be detected by combining the TRIUMF-ISAC Gamma-Ray Escape Suppressed Spectrometer...
Go to contribution page -
P. Chowdhury (University of Massachusetts Lowell)Poster PresentationsOral
We report on new advances in simulation, characterization and fabrication of the $^7$Li-enriched dual neutron-gamma scintillator C$^7$LYC. Detailed GEANT4 simulations have been performed, with specific focus on (n,p) and (n,$\alpha$) reactions on $^{35}$Cl that are primarily responsible for the fast neutron response of C$^7$LYC. The simulations are compared to experimental data to separate...
Go to contribution page -
Xin-Hui Wu (Peking University)Poster PresentationsOral
Machine learning is employed to build an energy density functional for self-bound nuclear systems for the first time. By learning the kinetic energy as a functional of the nucleon density alone, a robust and accurate orbital-free density functional for nuclei is established. Self-consistent calculations that bypass the Kohn-Sham equations provide the ground-state densities, total energies, and...
Go to contribution page -
Yakun Wang (Peking University)Poster PresentationsOral
The nuclear matrix elements of neutrinoless double-beta decay for nuclei 76Ge, 82Se, 100Mo, 130Te, and 150Nd are studied within the triaxial projected shell model, which incorporates simultaneously the triaxial deformation and quasiparticle configuration mixing. The low-lying spectra and the B(E2: 0+ to 2+) values are reproduced well. The effects of the quasiparticles configuration mixing, the...
Go to contribution page -
Dr Ali Mollaebrahimi (University of Groningen, University of Giessen and GSI Helmholtz Centre)Poster PresentationsOral
Mass spectrometry is a versatile and sensitive probe for studying the nuclear structure and decay properties of nuclei. The FRS Ion Catcher at GSI in Germany is a setup for high-accuracy mass spectrometry of projectile fragmentation by using the Multiple-Reflection Time-Of-Flight Mass Spectrometer (MR-TOF-MS) technique. An MR-TOF-MS enables highly accurate, fast and sensitive measurements of...
Go to contribution page -
Eilens Lopez-Saavedra (Florida State University)Poster PresentationsOral
At the John D. Fox Superconducting Linear Accelerator Laboratory a near-
Go to contribution page
threshold proton resonance in 11B at Eex = 11.44 ± 0.04 MeV is observed via
the reaction 10Be(d,n)11B →10Be + p in inverse kinematics, measured with a
beam of the radioactive isotope 10Be. The resonance energy at Ec.m. = 211(40)
keV is consistent with a proton signal observed by Ayyad et al. in the β−delayed
proton... -
Silviu-Marian Udrescu (Massachusetts Institute of Technology)Poster PresentationsOral
Precision molecular experiments provide a unique tool for measuring electroweak nuclear properties. Compared to atoms, certain molecules can offer more than eleven orders of magnitude enhanced sensitivity to symmetry-violating nuclear effects [Phys. Rev. Lett. 120, 142501], enabling precision tests of the Standard Model. Being able to trap the molecules of interest can significantly enhance...
Go to contribution page -
Georgia Votta (Michigan State University / FRIB)Poster PresentationsPoster
Measurements of spin observables are critical to understanding the role of spin-orbit, tensor, and nucleon-nucleon interactions. While they are an intrinsic part of scientific programs at worldwide facilities using electromagnetic beams, they are not routine although essential to understanding the structure and reactions of exotic nuclei. The Facility for Rare Isotope Beams (FRIB), which is...
Go to contribution page -
Dr Rodney Orford (LBL)Poster PresentationsOral
At the 88-inch cyclotron facility of Lawrence Berkeley National Laboratory the nuclear properties of exotic heavy and superheavy elements are studied using the FIONA (for the identification of nuclide $A$) apparatus coupled to the Berkeley Gas-filled Separator (BGS). Actinide and transactinide isotopes created in fusion-evaporation reactions are collected using the BGS and either delivered to...
Go to contribution page -
Oliver Gorton (San Diego State University)Poster PresentationsOral
High fidelity nuclear structure models are of little use if they cannot be computed on modern hardware. This is still the case for medium to heavy mass nuclei of interest to the nuclear physics community. We address the combinatorial growth of shell model dimensions with a novel method for efficient truncation of the Hilbert space. This work is inspired by the density-matrix renormalization...
Go to contribution page -
Linda Hlophe (Lawrence Livermore National Laboratory)Poster PresentationsPoster
Deuteron-induced nuclear reactions are typically described within a Faddeev three-body model consisting of a neutron, proton, and the nucleus interacting through pairwise forces. While Faddeev techniques enable the exact description of the three-body dynamics, their predictive power is limited in part by the omission of irreducible three-body nucleon-nucleon-nucleus forces. An alternative...
Go to contribution page -
Corina Andreoiu (Simon Fraser University)Poster PresentationsOral
Extensively explored in both experimental and theoretical studies, the tin isotopes with their closed shell corresponding to the 50 magic proton number continue to provide a fertile ground for studies of both single-particle and collective behaviours of nuclear matter. One recent display of collective
Go to contribution page
behaviour in the neutron-rich 124Sn74 nucleus is the phenomenon of Pygmy Quadrupole... -
Fatima H. Garcia (Lawrence Berkeley National Laboratory)Poster PresentationsOral
The regions around the magic numbers are of interest to both experimental and theoretical nuclear physics, since they serve as benchmarks for understanding nuclear structure, given their configurations. The area around $^{78}$Ni is one such area, and is of particular importance since it has been proposed as a portal to the fifth island of inversion [Nowacki, F. et al. Phys. Rev. Lett. 117,...
Go to contribution page -
Bo Cederwall (KTH Royal Institute of Technology)Poster PresentationsOral
Direct fast-timing lifetime measurements were carried out on low-lying states in the semimagic (N = 50) nucleus 94Ru. The experiment was carried out as the first in a series of “FAIR-0” experiments with the DESPEC experimental setup at the Facility for Antiproton and Ion Research (FAIR). Excited states in 94Ru were populated primarily via the β-delayed proton
Go to contribution page
emission of 95Pd nuclei, produced... -
Mr Nicholas Mendez (Michigan State University)Poster PresentationsPoster
The study of neutron unbound systems via the invariant mass technique is the primary focus of the MoNA Collaboration, which built and operates the MOdular Neutron Array (MoNA) and the Large multi-Institutional Scintillator Array (LISA). Reaction cross-sections for producing neutron unbound systems from radioactive ion beams can be small, 0.1-1mb, and the use of a thick reaction target degrades...
Go to contribution page -
Daniel Bazin (FRIB/MSU)Poster PresentationsPoster
The structure of $^{33}$Mg was investigated by means of two knockout reactions, one-neutron removal from $^{34}$Mg and one-proton removal from $^{34}$Al. Using comparative analysis of the population of observed excited states in the residual $^{33}$Mg, the nature of these states can be deciphered. In addition, the long-standing controversy about the parity of the $^{33}$Mg ground state is...
Go to contribution page -
Dr Lucia Caceres (CEA-GANIL)Poster PresentationsOral
L. Caceres on behalf of the S3 collaboration
The Super Separator Spectrometer (S3) facility is developed in the framework of the SPIRAL2 project. S3 has been designed to extend the capability of the facility to perform experiments with extremely low cross sections, taking advantage of the very high intensity stable beams of the superconducting linear accelerator of SPIRAL2.
Go to contribution page
The main areas... -
Julgen Pellumaj (INFN-LNL)Poster PresentationsOral
Quadrupole interaction between protons and neutrons drives the nucleus into deformed configurations at low excitation energies. Around the N=50 shell gap, intruder states with spins 1/2$^{+}$ and 5/2$^{+}$, originating from the s$_{1/2}$ and d$_{5/2}$ orbitals were first observed in $^{83}$Se and, later on, in the other N=49 isotones $^{87}$Kr, $^{81}$Ge and $^{79}$Zn. In $^{83}$Se these...
Go to contribution page -
Andrei Berceanu (ELI-NP)Poster PresentationsOral
The Extreme Light Infrastructure for Nuclear Physics (ELI-NP) pillar is located in Romania and is intended to serve the broad international scientific community. Its mission covers scientific research involving two domains: the first is laser-driven experiments related to NP, strong-field quantum electrodynamics, and associated vacuum effects.
The other research domain is based on the...
Go to contribution page -
Axel Frotscher (Lawrence Berkeley National Laboratory)Poster PresentationsOral
The knockout of nucleons from nuclei is a powerful tool to investigate nuclear structure. It was observed in several occurrences that different final states in a nucleus are populated when produced from one nucleon knockout $(p,2p)$ or from two nucleon knockout $(p,{}3p)$. The understanding of the latter could provide a new tool for nuclear spectroscopy.
Go to contribution page
Two experimental campaigns conducted... -
Soumik Bhattacharya (Florida State University)Poster PresentationsOral
Ni nuclei, having the magic proton number Z=28, are observed to have spherical shapes near ground state excitation throughout the N=28 to N=40 shell-closure. The experimentally observed low and moderate energy states can be well reproduced by the shell-model calculations involving $\nu$p$_{3/2}$, $\nu$f$_{5/2}$, $\nu$p$_{1/2}$ and $\nu$g$_{9/2}$ orbitals[1,2]. Though the N=40 sub-shell closure...
Go to contribution page -
Dr Sunghan Bae (Center for Exotic Nuclear Studies, Institue of Basic Science, RIKEN Nishina Center, Japan)Poster PresentationsOral
The neutron and proton mid-shell region, around N = 60 and Z = 40, is renowned for a sudden drop of first 2$^{+}$ state energy in even-even isotopes indicating shape deformation at N = 60 [1-5]. Type Ⅱ shell evolution is suggested to explain the origin of this shape deformation [6, 7] but more experimental data is required to understand this region. In order to figure out the structural...
Go to contribution page -
Vasil Karayonchev (Institute for Nuclear Physics, University of Cologne, TRIUMF)Poster PresentationsOral
Lifetimes of low-energy states in $^{211}$At have been measured using the recoil-distance Doppler shift, Doppler-shift attenuation, and fast-timing methods at the University of Cologne. The obtained reduced transition probabilities have been compared to two shell-model calculations, a large-scale shell-model calculation using the Kuo-Herling residual interaction and a calculation using a...
Go to contribution page -
Walid Younes (Lawrence Berkeley National Lab)Poster PresentationsOral
Literature search engines have become an integral and indispensable part of academic research. Search engines like google scholar rely on powerful AI/ML tools to return results that match the user's intended meaning as closely as possible, but they are better suited for general-purpose queries. As a result, they tend to overwhelm the user searching for domain-specific information with...
Go to contribution page -
Mejdi Mogannam (Michigan State University (MSU))Poster PresentationsPoster
The β-decay properties of isotopes far from stability, such as β-decay half-lives, β-decay branching ratios, and β-delayed neutron emission probabilities along with detailed level schemes, are necessary to validate nuclear structure models and inform theoretical predictions of the properties of isotopes that are not currently measurable. For nuclei far from stability where β-decay Q-values...
Go to contribution page
Choose timezone
Your profile timezone: