P. H. Regan
A5052679168- Nuclear physics research studies
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Astronomical and nuclear sciences
- Quantum Chromodynamics and Particle Interactions
- Nuclear reactor physics and engineering
- Radiation Detection and Scintillator Technologies
- Advanced Chemical Physics Studies
- Radioactivity and Radon Measurements
- Radioactive contamination and transfer
- Advanced NMR Techniques and Applications
- Radioactive Decay and Measurement Techniques
- Astro and Planetary Science
- Rare-earth and actinide compounds
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- X-ray Spectroscopy and Fluorescence Analysis
- Neutrino Physics Research
- Quantum, superfluid, helium dynamics
- Superconducting Materials and Applications
- Nuclear and radioactivity studies
- Graphite, nuclear technology, radiation studies
- Scientific Research and Discoveries
University of Surrey
2016-2025
National Physical Laboratory
2016-2025
University of York
1989-2020
Institute of Nuclear Physics, Polish Academy of Sciences
2007-2020
University of the West of Scotland
2019
Teddington Memorial Hospital
2018-2019
Florida State University
2019
University of Delhi
2007-2018
Institut Laue-Langevin
2018
Université Paris-Saclay
2018
Recoil decay tagging (RDT) is a very powerful method for the spectroscopy of exotic nuclei. RDT delayed coincidence technique between detectors usually at target position and focal plane spectrometer. Such measurements are often limited by dead time. This paper describes novel triggerless data acquisition method, which being developed Gamma Electron Alpha Tagging (GREAT) spectrometer, that overcomes this limitation virtually eliminating Our solution total readout (TDR) where all channels run...
With a new detector setup and the high-resolution performance of fragment separator FRS at GSI we discovered 57 isotopes in atomic number range 60$\leq Z \leq 78$: \nuc{159-161}{Nb}, \nuc{160-163}{Pm}, \nuc{163-166}Sm, \nuc{167-168}{Eu}, \nuc{167-171}{Gd}, \nuc{169-171}{Tb}, \nuc{171-174}{Dy}, \nuc{173-176}{Ho}, \nuc{176-178}{Er}, \nuc{178-181}{Tm}, \nuc{183-185}{Yb}, \nuc{187-188}{Lu}, \nuc{191}{Hf}, \nuc{193-194}{Ta}, \nuc{196-197}{W}, \nuc{199-200}{Re}, \nuc{201-203}{Os},...
Heavy neutron-rich nuclei were populated via the fragmentation of a E/A=1 GeV 20882Pb beam. Secondary fragments separated and identified subsequently implanted in passive stopper. By detection delayed γ rays, isomeric decays associated with these have been identified. A total 49 isomers detected, majority them observed for first time. The newly discovered are 204,20580Hg, 201,202,204,20579Au, 197,203,20478Pt, 195,199−20377Ir, 193,197−19976Os, 19675Re, 190,19174W, 18973Ta. Possible level...
An enhanced electric octupole (E3) strength of 45(5) W.u. has been measured for the <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msup><a:mrow><a:mn>3</a:mn></a:mrow><a:mrow><a:mo>−</a:mo></a:mrow></a:msup><a:mo stretchy="false">→</a:mo><a:msup><a:mrow><a:mn>0</a:mn></a:mrow><a:mrow><a:mo>+</a:mo></a:mrow></a:msup></a:mrow></a:math> transition in <d:math xmlns:d="http://www.w3.org/1998/Math/MathML"...
Mean lifetime measurements of low-lying yrast positive- and negative-parity states <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mmultiscripts><a:mi>Gd</a:mi><a:mprescripts/><a:none/><a:mn>150</a:mn></a:mmultiscripts></a:math> have been performed with the ROSPHERE array using <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mrow><b:mmultiscripts><b:mi>Ce</b:mi><b:mprescripts/><b:none/><b:mn>140</b:mn></b:mmultiscripts><b:mo>(</b:mo><b:mmultiscripts><b:mi...
The $\ensuremath{\gamma}$ decay of excited states in the waiting-point nucleus $^{130}\mathrm{Cd}_{82}$ has been observed for first time. An ${8}^{+}$ two-quasiparticle isomer populated both fragmentation a $^{136}\mathrm{Xe}$ beam as well projectile fission $^{238}\mathrm{U}$, making $^{130}\mathrm{Cd}$ most neutron-rich $N=82$ isotone which information about is available. results, interpreted using state-of-the-art nuclear shell-model calculations, show no evidence an shell quenching at...
The β-decay half-lives of 94 neutron-rich nuclei ^{144-151}Cs, ^{146-154}Ba, ^{148-156}La, ^{150-158}Ce, ^{153-160}Pr, ^{156-162}Nd, ^{159-163}Pm, ^{160-166}Sm, ^{161-168}Eu, ^{165-170}Gd, ^{166-172}Tb, ^{169-173}Dy, ^{172-175}Ho, and two isomeric states ^{174m}Er, ^{172m}Dy were measured at the Radioactive Isotope Beam Factory, providing a new experimental basis to test theoretical models. Strikingly large drops are observed neutron-number N=97 for _{58}Ce, _{59}Pr, _{60}Nd, _{62}Sm, N=105...
The antineutrino spectra measured in recent experiments at reactors are inconsistent with calculations based on the conversion of integral beta recorded ILL reactor. (92)Rb makes dominant contribution to reactor spectrum 5-8 MeV range but its decay properties question. We have studied total absorption spectroscopy. Previously unobserved feeding was seen 4.5-5.5 region and GS found be 87.5(25)%. impact calculated summation method is shown discussed.
The ^{12}C+^{12}C fusion reaction plays a critical role in the evolution of massive stars and also strongly impacts various explosive astrophysical scenarios. presence resonances this at energies around below Coulomb barrier makes it impossible to carry out simple extrapolation down Gamow window-the energy regime relevant carbon burning stars. system forms unique laboratory for challenging contemporary picture deep sub-barrier (possible hindrance) its interplay with nuclear structure...
We present a simple method for discerning the evolution from vibrational to rotational structure in nuclei as function of spin. The prescription is applied yrast cascades A approximately 110 region and clear transition motion found.
The low-lying structure of $^{188,190,192}\mathrm{W}$ has been studied following $\ensuremath{\beta}$ decays the neutron-rich mother nuclei $^{188,190,192}\mathrm{Ta}$ produced projectile fragmentation a 1-GeV-per-nucleon $^{208}\mathrm{Pb}$ primary beam on natural beryllium target at GSI Fragment Separator. $\ensuremath{\beta}$-decay half-lives $^{188}\mathrm{Ta}$, $^{190}\mathrm{Ta}$, and $^{192}\mathrm{Ta}$ have measured, with $\ensuremath{\gamma}$-ray states in their respective W...
The four proton-hole nucleus 204Pt was populated in the fragmentation of an E/A=1 GeV 208Pb beam. yrast structure has been observed up to angular momentum I=10ℏ by detecting delayed γ-ray transitions originating from metastable states. These long-lived excited states have identified spin-parities Iπ=(10+), (7−), and (5−) half-lives T1/2=146(14)ns, 55(3)μs, 5.5(7)μs, respectively. magic N=126 is discussed understood terms spherical shell model. data suggest a revision two-body interaction for...