A5070153510- Nuclear physics research studies
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Quantum Chromodynamics and Particle Interactions
- Astronomical and nuclear sciences
- High-Energy Particle Collisions Research
- Nuclear reactor physics and engineering
- Advanced NMR Techniques and Applications
- Advanced Chemical Physics Studies
- Statistical Mechanics and Entropy
- Scientific Research and Discoveries
- Cold Atom Physics and Bose-Einstein Condensates
- Particle physics theoretical and experimental studies
- Mass Spectrometry Techniques and Applications
- Photocathodes and Microchannel Plates
- Computational Geometry and Mesh Generation
- Solar and Space Plasma Dynamics
- Quantum and Classical Electrodynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Radiation Therapy and Dosimetry
- Advanced Sensor Technologies Research
- Nuclear Materials and Properties
- Crystallography and Radiation Phenomena
- Radiopharmaceutical Chemistry and Applications
- Advanced X-ray Imaging Techniques
New Uzbekistan University
2024
National University of Uzbekistan
2024
TRIUMF
2015-2020
Saint Mary's University
2015-2020
National Superconducting Cyclotron Laboratory
2010-2019
Michigan State University
2008-2019
University of Edinburgh
2015
Washington University in St. Louis
2015
Spectroscopic factors have been extracted for proton-rich $^{34}\mathrm{Ar}$ and neutron-rich $^{46}\mathrm{Ar}$ using the ($p$, $d$) neutron transfer reaction. The experimental results show little reduction of ground state spectroscopic factor nucleus compared to that $^{46}\mathrm{Ar}$. suggest correlations, which generally reduce such factors, do not depend strongly on neutron-proton asymmetry in this isotopic region as was reported knockout reactions. present are consistent with from...
Efficiency corrected single ratios of neutron and proton spectra in central $^{112}$Sn+$^{112}$Sn $^{124}$Sn+$^{124}$Sn collisions at 120 MeV/u are combined with double to provide constraints on the density momentum dependencies isovector mean-field potential. Bayesian analyses these data reveal that isoscalar nucleon effective masses, $m_s^* - m_v^*$ strongly correlated. The linear correlation observed yields a nearly independent constraint mass splitting $\Delta m_{np}^*= (m_n^*-m_p^*)/m_N...
The interaction of an E/A=70-MeV (7)Be beam with a Be target was used to populate levels in (6)Be following neutron knockout reactions. three-body decay the ground and first excited states into α+p+p exit channel were detected High Resolution Array. Precise correlations extracted from experimental data allowed us obtain insight mechanism democratic decay. correlation are good agreement three-cluster-model calculation thus validate this theoretical approach over broad energy range.
The first conclusive evidence of a dipole resonance in ^{11}Li having isoscalar character observed from inelastic scattering with novel solid deuteron target is reported. experiment was performed at the newly commissioned IRIS facility TRIUMF. results show peak an excitation energy 1.03±0.03 MeV width 0.51±0.11 (FWHM). angular distribution consistent distorted-wave Born approximation framework. together shell model calculations signature that monopole tensor interaction important ^{11}Li. ab...
It has been generally accepted that momentum-dependent potentials for neutrons and protons at energies well away from the Fermi surface cause both to behave as if their inertial masses are effectively 70% of vacuum values. This similarity in effective may no longer hold dense neutron-rich regions within neutron stars, core-collapse supernovas, nuclear collisions. There differences symmetry proton differ significantly. We investigate this effect by measuring energy spectra neutrons, protons,...
The interactions of an $E/A=70$-MeV $^{9}\mathrm{C}$ beam with a Be target was used to populate levels in Be, B, and C isotopes, which undergo decay into many-particle exit channels. products were detected the HiRA array level energies identified from their invariant mass. Correlations between examined deduce nature decays, specifically what extent all fragments created one prompt step or whether disintegration proceeded sequential fashion through long-lived intermediate states. In latter...
Single-neutron-transfer measurements using ($p$,$d$) reactions have been performed at 33 MeV per nucleon with proton-rich $^{34}\mathrm{Ar}$ and neutron-rich $^{46}\mathrm{Ar}$ beams in inverse kinematics. The extracted spectroscopic factors are compared to the large-basis shell-model calculations. Relatively weak quenching of is observed between $^{46}\mathrm{Ar}$. experimental results suggest that neutron correlations a dependence on asymmetry nucleus over this isotopic region. present...
Proton inelastic scattering off a neutron halo nucleus, 11Li, has been studied in inverse kinematics at the IRIS facility TRIUMF. The aim was to establish soft dipole resonance and obtain its strength. Using high quality 66 MeV 11Li beam, strongly populated excited state observed Ex=0.80 +/- 0.02 with width of 1.15 0.06 MeV. A DWBA (distorted-wave Born approximation) analysis measured differential cross section isoscalar macroscopic form factors leads conclude that this is an electric (E1)...
This Letter reports a study of the highly debated $^{10}\mathrm{Li}$ structure through $d(^{9}\mathrm{Li},p)^{10}\mathrm{Li}$ one-neutron transfer reaction at 100 MeV. The energy spectrum is measured up to 4.6 MeV and angular distributions corresponding different excitation regions are reported for first time. comparison between data theoretical predictions, including pairing correlation effects, shows existence ${p}_{1/2}$ resonance $0.45\ifmmode\pm\else\textpm\fi{}0.03\text{ }\text{...
Resonance-decay spectroscopy is used to study particle-unbound excited states produced in interactions of $E/A=50$ MeV $^{12}\mathrm{Be}$ on polyethylene and carbon targets. The are a variety reaction mechanisms, ranging from projectile fragmentation proton pickup. New proton-decaying observed $^{9}\mathrm{Li}$(${E}^{*}=14.1\ifmmode\pm\else\textpm\fi{}0.1 \mathrm{MeV}$, $\ensuremath{\Gamma}=207\ifmmode\pm\else\textpm\fi{}49$ keV)...
The first measurement of the one-neutron transfer reaction 11Li(p,d)10Li performed using IRIS facility at TRIUMF with a 5.7AMeV 11Li beam interacting solid H2 target is reported. 10Li residue was populated strongly as resonance peak energy Er=0.62±0.04MeV having total width Γ=0.33±0.07MeV. angular distribution this characterized by neutron occupying 1p1/2 orbital. A DWBA analysis yields spectroscopic factor 0.67±0.12 for p1/2 removal strength from ground state to region peak.
$^{8}\mathrm{C}$ is found to decay four protons and an $\ensuremath{\alpha}$ particle in two $2p$ emission steps. The correlations between the first step ($^{8}\mathrm{C}$ $^{6}\mathrm{Be}$) exhibit a significant enhancement region of phase space where have small relative energy, sometimes called diproton region. isobaric analog $^{8}\mathrm{B}$ also by emission. This case isospin-allowed states.
How does nature hold together protons and neutrons to form the wide variety of complex nuclei in Universe? Describing many-nucleon systems from fundamental theory quantum chromodynamics has been greatest challenge answering this question. The chiral effective field description nuclear force now makes possible but requires certain parameters that are not uniquely determined. Defining needs identification observables sensitive different parametrizations. From a measurement proton elastic...
The breakup of $E/A=50$ MeV $^{12}\mathrm{Be}$ fragments following inelastic scattering off hydrogen and carbon target nuclei has been studied. channels $\ensuremath{\alpha}+$$^{8}\mathrm{He}$, $^{6}\mathrm{He}$$+$$^{6}\mathrm{He}$, $t+$$^{9}\mathrm{Li}$, $p+$$^{11}\mathrm{Li}$ were observed. Two doublets at excitation energies 12.8 15.5 found for the $\ensuremath{\alpha}+$$^{8}\mathrm{He}$ channel. A low-energy shoulder in excitation-energy spectra 10.2 indicates one or more additional...
Deviations from the isobaric multiplet mass equation are presented and discussed for A=7, T=3/2 quartet A=8, T=2 quintet.Received 19 October 2011DOI:https://doi.org/10.1103/PhysRevC.84.051308©2011 American Physical Society
The low energy excited $0_{2,3}^+$ states in $^{96}$Sr are amongst the most prominent examples of shape coexistence across nuclear landscape. In this work, neutron $[2s_{1/2}]^2$ content $0_{1,2,3}^+$ was determined by means d($^{95}$Sr,p) transfer reaction at TRIUMF-ISAC2 facility using SHARC and TIGRESS arrays. Spectroscopic factors 0.19(3) 0.22(3) were extracted for ground 1229~keV $0^+$ states, respectively, fitting experimental angular distributions to DWBA model calculations. A...
The ground state of ${}^{11}$Li is the preeminent example a two-neutron-halo nucleus and part an isobaric sextet. Another member this sextet, double analog ${}^{11}$Li${}_{\mathrm{g}.\mathrm{s}.}$ in ${}^{11}$B, has been identified ${}^{12}$Be($p,2n$)${}^{11}$B reaction. was discovered through its two-proton decay branch. From detected $2p+{}^{9}$Li events, excitation energy determined to be 33.57(8) MeV using invariant mass method. With known masses ${}^{11}$Be, three members same sextet...
Spectroscopic information has been extracted on the hole-states of $^{55}$Ni, least known quartet nuclei ($^{55}$Ni, $^{57}$Ni, $^{55}$Co and $^{57}$Co), one neutron away from $^{56}$Ni, N=Z=28 double magic nucleus. Using $^{1}$H($^{56}$Ni,d)$^{55}$Ni transfer reaction in inverse kinematics, spectroscopic factors, spins parities have for f$_{7/2}$, p$_{3/2}$ s$_{1/2}$ $^{55}$Ni. This new data provides a benchmark large basis calculations that include nucleonic orbits both sd pf shells. State...
The $^{9}\mathrm{Be}(^{28}\mathrm{Mg},^{27}\mathrm{Na})$ one-proton removal reaction with a large proton separation energy of ${S}_{p}(^{28}\mathrm{Mg})=16.79$ MeV is studied at intermediate beam energy. Coincidences the bound $^{27}\mathrm{Na}$ residues protons and other light charged particles are measured. These data analyzed to determine percentage contributions cross section from elastic inelastic nucleon mechanisms. deduced compared eikonal model predictions previously measured for...
The region around neutron number N = 60 in the neutron-rich Sr and Zr nuclei is one of most dramatic examples a ground state shape transition from (near) spherical below to strongly deformed shapes heavier isotopes. single-particle structure 95-97Sr approaching at 98 has been investigated via single-neutron transfer reactions using (d, p) reaction inverse kinematics. These selectively populate states with large overlap projectile coupled orbital. Radioactive 94,95,96Sr energies 5.5 AMeV were...
The sequential breakup of $E/A=65.5\text{-MeV}\phantom{\rule{4pt}{0ex}}^{7}\mathrm{Be}$ and $E/A=36.6\text{-MeV}\phantom{\rule{4pt}{0ex}}^{6}\mathrm{Li}$ projectiles excited through inelastic interactions with $^{9}\mathrm{Be}$ target nuclei has been studied. For events where the nucleus remained in its ground state, significant alignment projectile's spin axis parallel or antiparallel to beam direction was observed. This unusual found be largely independent scattering angle it deduced that...
The two-proton removal reaction from 28Mg projectiles has been studied at 93 MeV/u the NSCL. First coincidence measurements of heavy 26Ne projectile residues, removed protons and other light charged particles enabled relative cross sections each three possible elastic inelastic proton mechanisms to be determined. These more final-state-exclusive are key for further interrogation these use channel quantitative spectroscopy very neutron-rich nuclei. absolute yields contributing compared model...