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Your search keyword '"TITANIUM isotopes"' showing total 5 results
Start Over Descriptor "TITANIUM isotopes" Publisher edp sciences
5 results on '"TITANIUM isotopes"'

1. Preliminary results of lifetime measurements in neutron-rich 53Ti.

Author

de Angelis, G., Corradi, L., Goldkuhle, Alina, Fransen, Christoph, Dewald, Alfred, Alahari, Navin, Beckers, Marcel, Birkenbach, Benedikt, Blazhev, Andrey, Braunroth, Thomas, Clément, Emmanuel, De France, Gilles, Dudouet, Jérémie, Eberth, Jürgen, Hess, Herbert, Jacquot, Bertrand, Kim, Yung-Hee, Lemasson, Antoine, Lenzi, Silvia Monica, and Li, Hongjie

Subjects
*NEUTRONS, *NUCLEAR structure, *INELASTIC scattering, *SPECTROMETERS, TITANIUM isotopes
Abstract

To study the nuclear structure of neutron-rich titanium isotopes, a lifetime measurement was performed at the Grand Accélérateur National d'Ions Lourds (GANIL) facility in Caen, France. The nucleiwere produced in a multinucleon-transfer reaction by using a 6.76 MeV/u 238U beam. The Advanced Gamma Tracking Array (AGATA) was employed for the γ-ray detection and target-like recoils were identified event-by-event by the large-acceptance variable mode spectrometer (VAMOS++). Preliminary level lifetimes of the (5/2−) to 13/2− states of the yrast band in the neutron-rich nucleus 53Ti were measured for the first time employing the recoil distance Doppler-shift (RDDS) method and the compact plunger for deep inelastic reactions. The differential decay curve method (DDCM) was used to obtain the lifetimes from the RDDS data. [ABSTRACT FROM AUTHOR]

Published
2019
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2. Long-term evolution of the heliospheric magnetic field inferred from cosmogenic 44Ti activity in meteorites.

Author

Mancuso, S., Taricco, C., Colombetti, P., Rubinetti, S., Sinha, N., and Bhandari, N.

Subjects
*COSMOGENIC nuclides, *GALACTIC cosmic rays, *COSMIC magnetic fields, *SUNSPOTS, *METEORITES, TITANIUM isotopes
Abstract

Typical reconstructions of historic heliospheric magnetic field (HMF) BHMF are based on the analysis of the sunspot activity, geomagnetic data or on measurement of cosmogenic isotopes stored in terrestrial reservoirs like trees (14C) and ice cores (10Be). The various reconstructions of BHMF are however discordant both in strength and trend. Cosmogenic isotopes, which are produced by galactic cosmic rays impacting on meteoroids and whose production rate is modulated by the varying HMF convected outward by the solar wind, may offer an alternative tool for the investigation of the HMF in the past centuries. In this work, we aim to evaluate the long-term evolution of BHMF over a period covering the past twenty-two solar cycles by using measurements of the cosmogenic 44Ti activity (τ1/2 = 59.2 ± 0.6 yr) measured in 20 meteorites which fell between 1766 and 2001. Within the given uncertainties, our result is compatible with a HMF increase from 4.87+0.24-0.30 nT in 1766 to 6.83+0.13-0.11 nT in 2001, thus implying an overall average increment of 1.96+0.43-0.35 nT over 235 years since 1766 reflecting the modern Grand maximum. The BHMF trend thus obtained is then compared with the most recent reconstructions of the near-Earth HMF strength based on geomagnetic, sunspot number, and cosmogenic isotope data. [ABSTRACT FROM AUTHOR]

Published
2018
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3. Study of sub-barrier fusion of 36S+50Ti,51V systems.

Author

de Angelis, G., Corradi, L., Colucci, Giulia, Montagnoli, Giovanna, Stefanini, Alberto M., Hagino, Kouichi, Caciolli, Antonio, Čolović, Petra, Corradi, Lorenzo, Fioretto, Enrico, Galtarossa, Franco, Goasduff, Alain, Grebosz, Jerzy, Mazzocco, Marco, Montanari, Daniele, Parascandolo, Concetta, Scarlassara, Fernando, Siciliano, Marco, Strano, Emanuele, and Szilner, Suzana

Subjects
*GROUND state energy, *ANGULAR distribution (Nuclear physics), *TELESCOPES, *DATA analysis, TITANIUM isotopes
Abstract

A detailed comparative study of the sub-barrier fusion of the two near-by systems 36S+50Ti,51V was performed at the National Laboratories of Legnaro (INFN). Aim of the experiment was the investigation of possible effects of the non-zero spin of the ground state of the 51V nucleus on the sub-barrier excitation function, and in particular on the shape of the barrier distribution. The results sh w that the two measured excitation functions are very similar down to the level of 20 - 30 μb. The same is observed for the two barrier distributions. Coupled-channels calculations have been performed and are in good agreement with the experimental data. This result indicates that the low-lying levels in 51V can be interpreted in the weak-coupling scheme, that is, 51V(I) = 50Ti(2+)⊗ p(1 f7/2). [ABSTRACT FROM AUTHOR]

Published
2019
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4. Energy levels and transition rates for the boron isoelectronic sequence: Si X, Ti XVIII - Cu XXV.

Author

Jönsson, P., Ekman, J., Gustafsson, S., Hartman, H., Karlsson, L. B., Du Rietz, R., Gaigalas, G., Godefroid, M. R., and Froese Fischer, C.

Subjects
*ENERGY levels (Quantum mechanics), *RELATIVISTIC configuration interaction, *ISOELECTRONIC sequences, *SILICON isotopes, *COPPER isotopes, *BORON, *WAVE functions, *ELECTRON configuration, TITANIUM isotopes
Abstract

Relativistic configuration interaction (RCI) calculations are performed for 291 states belonging to the configurations 1s22s22p, 1s22s2p2, 1s22p3, 1s22s23l, 1s22s2p3l, 1s22p23l, 1s22s24l', 1s22s2p4l' , and 1s22p24l' (l = 0, 1,2 and l' = 0, 1, 2, 3) in boron-like ions Si X and Ti XVIII to Cu XXV. Electron correlation effects are represented in the wave functions by large configuration state function (CSF) expansions. States are transformed from j j-coupling to LS -coupling, and the LS -percentage compositions are used for labeling the levels. Radiative electric dipole transition rates are given for all ions, leading to massive data sets. Calculated energy levels are compared with other theoretical predictions and crosschecked against the Chianti database, NIST recommended values, and other observations. The accuracy of the calculations are high enough to facilitate the identification of observed spectral lines. [ABSTRACT FROM AUTHOR]

Published
2013
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5. Creation and transmutation of magnetized nuclei at explosively dense matter.

Author

Kondratyev, V. N.

Subjects
*TRANSMUTATION (Chemistry), *NUCLEAR physics, *PLASMA astrophysics, *SUPERNOVAE, *GALACTIC X-ray sources, TITANIUM isotopes
Abstract

Synthesis of iron group chemical elements is considered for the ultra-magnetized astrophysical plasma in supernovae. Maximum of nucleosynthesis products is shown to shift towards smaller mass numbers approaching titanium due to magnetic modification of nuclear structure. The results are corroborated with an excess of 44Ti revealed from the INTEGRAL mission data. [ABSTRACT FROM AUTHOR]

Published
2012
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