Search

Your search keyword '"Regan, Patrick"' showing total 526 results
Start Over Author "Regan, Patrick"
526 results on '"Regan, Patrick"'

53. Coulomb excitation of neutron-deficient $^{78,80}$Sr and deformation around N=Z=40

Author

Henderson, Jack, Wadsworth, Robert, Orce, Nico, Catford, Wilton, Doherty, Daniel, Heery, Jacob, Lotay, Gavin, Podolyak, Zsolt, Regan, Patrick, Russell, Reuben, Barton, Charles, Bentley, Michael, Jenkins, David, Gaffney, Liam, Kisyov, Stanimir, Wu, Ching-Yen, Allmond, James, Gray, Tim, Hadynska-Klek, Katarzyna, Komorowska, Michalina, Napiorkowski, Pawel, Wrzosek-Lipska, Katarzyna, Andreoiu, Corina, Spagnoletti, Pietro, Wu, Frank, Smallcombe, James, Ruotsalainen, Panu, Garrett, Paul, Zielinska, Magda, Hackman, Greg, Browne, Frank, Kroell, Thorsten, and Warr, Nigel

Subjects
Detectors and Experimental Techniques
Published
2022

56. Deterring Rebellion

Author

Machain, Carla Martinez, Morgan, T. Clifton, and Regan, Patrick M.

Published
2011

57. The mutable nature of particle-core excitations with spin in the one-valence-proton nucleus ¹³³Sb

Author

Bocchi, Giovanni, Leoni, Silvia, Fornal, Bogdan, Col��, Gianluca, Bortignon, Pier Francesco, Bottoni, Simone, Bracco, Angela, Michelagnoli, Caterina, Bazzacco, Dino B., Blanc, Aur��lien, France, Gilles de, Jentschel, Michael, K��ster, Ulli, Mutti, Paolo, R��gis, Jean Marc, Simpson, Gary S., Soldner, Torsten, Ur, Calin Alexandru, Urban, Waldemar, Fraile, Luis Mario, Lozeva, Radomira, Belvito, B., Benzoni, Giovanna, Bruce, Alison M., Carroll, R., Cieplicka-Orynczak, Natalia, Crespi, Fabio Celso Luigi, Didierjean, Fran��ois, Jolie, Jan, Korten, Wolfram, Kr��ll, Thorsten, Nannini, Adriana, Napoli, Daniel R., Olaizola, Bruno, Paziy, V., Podoly��k, Zs., Regan, Patrick, Saed-Samii, N., Szpak, Bart��omiej, Lalkovski, Stefan, Mach, Henryk A., M��rginean, Nicolae Marius, Melon, Barbara, Mengoni, Daniele, Million, B��n��dicte, and Vedia, Victoria

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

The ��-ray decay of excited states of the one-valence-proton nucleus ������Sb has been studied using cold-neutron induced fission of �������U and �������Pu targets, during the EXILL campaign at the ILL reactor in Grenoble. By using a highly efficient HPGe array, coincidences between ��-rays prompt with the fission event and those delayed up to several tens of microseconds were investigated, allowing to observe, for the first time, high-spin excited states above the 16.6 ��s isomer. Lifetimes analysis, performed by fast-timing techniques with LaBr���(Ce) scintillators, revealed a difference of almost two orders of magnitude in B(M1) strength for transitions between positive-parity medium-spin yrast states. The data are interpreted by a newly developed microscopic model which takes into account couplings between core excitations (both collective and non-collective) of the doubly magic nucleus ������Sn and the valence proton, using the Skyrme effective interaction in a consistent way. The results point to a fast change in the nature of particle-core excitations with increasing spin.

Published
2022

59. The Spectrum of Alumni Involvement.

Author

Brant, Keith E. and Regan, Patrick J.

Abstract

Asserts that for some in advancement, and many observers outside the profession, giving has become the primary measure of alumni satisfaction and the success of an alumni program. Two practitioners take issue with that assumption and offer ways to develop more comprehensive program assessment tools. (EV)

Published
2002

76. Fusion cross section measurements of astrophysical interest for light heavy ions systems within the STELLA project

Author

Fruet Guillaume, Courtin Sandrine, Jenkins David G., Heine Marcel, Montanari Daniele, Morris Luke G., Adsley Philip, Beck Christian, Della Negra Serge, Haas Florent, Hammache Fairouz, Kirsebom Oliver S., Meyer Anne, Regan Patrick H., Rudiger Matthias, de Séréville Nicolas, and Stodel Christelle

Subjects
Physics, QC1-999
Abstract

This contribution is focused on the STELLA project (STELlar LAboratory), which aims at the measurement of fusion cross sections between light heavy ions like 12C+12C, 12C+16O or 16O+16O at deep subbarrier energies. The gamma-particle coincidence technique is used in order to reduce background contributions that become dominant for measurements in the nanobarn regime. The experimental setup composed of an ultra high vacuum reaction chamber, a set of 3 silicon strip detectors, up to 36 LaBr3(Ce) scintillators from the UK FATIMA collaboration, and a fast rotating target system will be described. The 12C+12C fusion reaction has been studied from Elab = 11 to 5.6 MeV using STELLA at the Andromède facility in Orsay, France. Preliminary commissioning results are presented in this article.

Published
2017
Full Text
View/download PDF

89. Low-Z boundary of the N = 88-90 shape phase transition: 148Ce near the critical point

Author

Koseoglou, P., Werner, V., Pietralla, N., Ilieva, S., Nikšić, T., Vretenar, D., Alexa, P., Thűrauf, M., Bernards, C., Blanc, A., Bruce, A. M., Cakirli, R. B., Cooper, N., Fraile, L. M., de France, G., Jentschel, M., Jolie, J., Kőster, U., Korten, W., Krőll, T., Lalkovski, S., Mach, H., Mărginean, N., Mutti, P., Patel, Z., Paziy, V., Podolyak, Zs., Regan, Patrick, Régis, J.-M., Roberts, O. J., Saed-Samii, N., Simpson, G. S., Soldner, T., Ur, C. A., Urban, W., Wilmsen, D., and Wilson, E.

Abstract

Excited states of the neutron-rich nucleus 148Ce have been populated by neutron-induced fission of 235U and 241Pu samples. Their electromagnetic decays were studied by means of γ-ray coincidence spectroscopy with fast-timing capabilities. Lifetimes of the 2+1 and 4+1 states of 148Ce were obtained and their E2 decay rates deduced. The B4=2 = B(E2; 4+1 → 2+1)=B(E2; 2+1 → 0+1) ratio indicates that 148Ce is a transitional nucleus while the N = 88/90 shape phase transition evolves into a gradual change of nuclear deformation for proton numbers Z < 60.

Published
2020

91. Mass transit gap: mass transit systems are cutting costs and corners - and gambling with riders' safety.

Author

Regan, Patrick M. and Regan, Christopher J.

Subjects
Public transportation -- Evaluation -- Government finance -- Safety and security measures, Safety factor in engineering -- Evaluation -- Finance, Company financing
Abstract

On June 22,2009, two subway cars collided in Washington, D.C.'s Metro system, killing nine and injuring more than 50 others. The accident was caused by the failure of Metro's monitoring [...]

Published
2016

92. NASA's mission reliable

Author

Regan, Patrick and Hamilton, Scott

Subjects
Application development software, Application installation/distribution software, Technology application, Company business management, United States. National Aeronautics and Space Administration -- Technology application, Program development software -- Management, Outer space -- Discovery and exploration, Outer space -- Technology application
Published
2004

100. Evolution of E2 strength in the rare-earth isotopes Hf174,176,178,180

Author

Wiederhold, J., Werner, V., Kern, R., Pietralla, N., Bucurescu, D., Carroll, R., Cooper, N, Daniel, T., Filipescu, D., Florea, N., Gerst, R-B., Ghita, D., Gurgi, Laila, Jolie, J., Ilieva, Ralitsa, Lica, R., Marginean, N., Marginean, R., Mihai, C., Mitu, I. O., Naqvi, F., Nita, C., Rudigier, Matthias, Stegemann, S., Pascu, S., and Regan, Patrick

Abstract

Mean lifetimes of yrast states of the isotopes 174,176,178,180Hf have been measured using fast- electronic scintillation timing. Excited states of 74,176,178Hf were populated via β decay, while 180Hf was populated via Coulomb excitation. The lifetimes of the 2+ 1 and 4+ 1 states of all isotopes and the lifetimes of the 6+ 1 states of 174,178Hf were measured, using the slope and the centroid shift methods. The mean lifetime, τ (4+ 1 ) = 85(13) ps, of 178Hf has been determined for the first time. In addition, the mean lifetimes of the 2− 1 and the 3− 1 states of 176Hf have been determined. Systematic uncertainties on the evolution of data as a function of neutron number were reduced by using the same setup for all the isotopes of interest. The data are in agreement with other recent lifetime measurements where available and shows a shift of the maximum of collectivity for the Hf isotopic chain from neutron midshell at N = 104 to N = 100.

Published
2019

Catalog

Books, media, physical & digital resources
See catalog results