1772638
Color octet scalars and high p_T four-jet events at the LHC
We study the effect of color octet scalars on the high transverse momenta four-jet cross section at the LHC. We consider both weak singlet and doublet scalars, concentrating on the case of small couplings to quarks. We find that a relatively early discovery at the LHC is possible for a range of scalar masses.
119194544
Prospects and constraints for vector-like MFV matter at LHC
We examine the prospects for LHC discovery of SU(2)L singlet vector-like quarks that obey Minimal Flavour Violation (MFV) and are consistent with lower energy phenomenology. We study models where the vector-like quarks have the same quantum numbers as uR or dR, allowing mixing, which generally leads to significant low energy constraints. We find that at leading order in the MFV expansion there are two naturally phenomenologically viable MFV models of this type when the Weyl spinor components of the vector-like quarks are flavour triplets. We examine direct production bounds, flavour and electroweak precision data constraints for these models and determine the cross section for allowed values of the model parameters at LHC. For the models we identify as naturally phenomenologically viable, large amounts of parameter space afford a significant early discovery reach at LHC while being consistent with lower energy phenomenology.
34406165
Standard model with compactified spatial dimensions
We analyze the structure of the standard model coupled to gravity with spatial dimensions compactified on a three-torus. We find that there are no stable one-dimensional vacua at zero temperature, although there does exist an unstable vacuum for a particular set of Dirac neutrino masses.
122206593
Observation of Octupole Structures in Radon and Radium Isotopes and Their Contrasting Behavior at High Spin
Multinucleon transfer reactions have been used, for the first time, to populate high-spin bands of alternating parity states in {sup 218,220,222}Rn and {sup 222,224,226}Ra. The behavior of the angular momentum alignment with rotational frequency for the Rn isotopes is very different when compared with Ra and Th isotopes with N{approx}134, indicating a transition from octupole vibrational to stable octupole deformation. Throughout the measured spin range the values of {vert_bar}D{sub 0}/Q{sub 0}{vert_bar} remain constant for {sup 222}Ra and {sup 226}Ra and have a very small value for {sup 224}Ra, suggesting that the charge and mass distributions are not affected appreciably by rotations. {copyright} {ital 1997} {ital The American Physical Society}
121124575
Level structure of the neutron-rich Cr 56 , 58 , 60 isotopes: Single-particle and collective aspects
Zhu, S. Deacon, A. N. Freeman, S. J. Janssens, R. V. F. Fornal, B. Honma, M. Xu, F. R. Broda, R. Calderin, I. R. Carpenter, M. P. Chowdhury, P. Kondev, F. G. Krolas, W. Lauritsen, T. Liddick, S. N. Lister, C. J. Mantica, P. F. Pawlat, T. Seweryniak, D. Smith, J. F. Tabor, S. L. Tomlin, B. E. Varley, B. J. Wrzesinski, J.
120147574
High-energy {gamma}-ray spectra associated with selected evaporation residues in low-energy fusion reactions
The spectra of high-energy {gamma} rays in coincidence with evaporation residues {sup 155,154}Er populated in the reaction of 241 MeV {sup 64}Ni on {sup 92}Zr have been compared with results from Monte Carlo statistical model calculations. The shape of the spectrum in coincidence with the {sup 155}Er nuclei is reproduced only by simulations in which the spin distribution is extended towards very high spin values. {copyright} {ital 1997} {ital The American Physical Society}
121344774
Development of shell closures at N=32, 34. II. Lowest yrast excitations in even-even Ti isotopes from deep-inelastic heavy-ion collisions
Gamma rays from neutron-rich nuclei in the vicinity of $Z=20$, $N=28$ have been studied at Gammasphere using deep-inelastic reactions induced by a $330\text{\ensuremath{-}}\mathrm{MeV}$ $^{48}\mathrm{Ca}$ beam on a thick $^{238}\mathrm{U}$ target. The yrast $\ensuremath{\gamma}$-ray cascade of $^{56}\mathrm{Ti}$ was identified for the first time and the location in energy of the ${2}^{+}$, ${4}^{+}$, and ${6}^{+}$ states was determined. The low-spin $^{56}\mathrm{Ti}$ yrast structure does not support the presence of a subshell closure at $N=34$ as suggested on the basis of other data on nuclei in the region as well as shell model calculations with a recently proposed interaction.
117949090
High-lying, non-yrast shell structure in Ti 52
Zhu, S. Janssens, R. V. F. Fornal, B. Freeman, S. J. Honma, M. Broda, R. Carpenter, M. P. Deacon, A. N. Jackson, E. Kay, B. P. Lauritsen, T. Lister, C. J. Mantica, P. F. Otsuka, T. Seweryniak, D. Smith, J. F. Steppenbeck, D. Wang, X.