72 research outputs found
Evidence of a new state in Be observed in the Li -decay
Coincidences between charged particles emitted in the -decay of
Li were observed using highly segmented detectors. The breakup channels
involving three particles were studied in full kinematics allowing for the
reconstruction of the excitation energy of the Be states participating
in the decay. In particular, the contribution of a previously unobserved state
at 16.3 MeV in Be has been identified selecting the +
He + He+n channel. The angular correlations between the
particle and the center of mass of the He+n system favors spin and
parity assignment of 3/2 for this state as well as for the previously known
state at 18 MeV.Comment: 13 pages, 6 figure
Study of β-delayed charged particle emission of 11Li: Evidence of new decay channels
5 pags., 3 figs. -- 9th International Conference on Clustering Aspects of Nuclear Structure and Dynamics (CLUSTERS'07) 3–7 September 2007, Stratford upon Avon, UKThe break-up of the 18.2 MeV state in 11Be was studied in a 11Li β-decay experiment. We report here on the study of the dominating breakup channels involving na6He or 3n2α in the final state, with special emphasis dedicated in this contribution to the three-particle channel. The two emitted charged particles were detected in coincidence using a highly segmented experimental set-up. The observed experimental energy-vs-energy scatter plot indicates a sequential breakup where nuclei of mass 4, alpha particles, and mass 7, 7He, are involved. A Monte-Carlo simulation of the sequential channel, 11Be* → α + 7He → nα6He was performed and compared to the experimental data and to a simulation of the direct break-up of the 18.2 MeV state nα6He by phase space energy distribution. The energy-versus-energy plot are explained by the sequential simulation but not by the phase space simulation. © 2008 IOP Publishing Ltd
Study of beta-delayed 3-body and 5-body breakup channels observed in the decay of ^11Li
The beta-delayed charged particle emission from ^11Li has been studied with
emphasis on the three-body n+alpha+^6He and five-body 2alpha+3n channels from
the 10.59 and 18.15 MeV states in ^11Be. Monte Carlo simulations using an
R-matrix formalism lead to the conclusion that the ^AHe resonance states play a
significant role in the break-up of these states. The results exclude an
earlier assumption of a phase-space description of the break-up process of the
18.15 MeV state. Evidence for extra sequential decay paths is found for both
states.Comment: 16 pages, 9 figures. Submitted to Nuclear Physics
Study of the onset of deformation and shape coexistence in Ar via the inverse kinematics () reaction
Study of single particle properties of neutron-rich Na isotopes on the "shore of the island of inversion'' by means of neutron-transfer reactions
Study of single particle properties of neutron-rich Na isotopes on the "shore of the island of inversion" by means of neutron-transfer reactions
Coulomb breakup of 17 Ne from the view point of nuclear astrophysics
6 pags., 5 figs. -- XII International Symposium on Nuclei in the Cosmos, August 5-12, 2012, Cairns, AustraliaBy the Coulomb breakup of 17Ne, the time-reversed reaction 15O(2p, γ) 17Ne has been studied.
This reaction might play an important role in the rp process, as a break-out reaction of the hot
CNO cycle. The secondary 17Ne ion beam with an energy of 500 MeV/nucleon has been dissociated in a Pb target. The reaction products have been detected with the LAND-R3B experimental
setup at GSI. The preliminary differential and integral Coulomb dissociation cross section σCoul
has been determined, which then will be converted into a photo-absorption cross section σphoto,
and a two-proton radiative capture cross section σcap. Additionally, information about the structure of the 17Ne, a potential two-proton halo nucleus, will be received. The analysis is in progress.This project was supported by the German Federal Ministry for Education and Research
(BMBF), EU(EURONS), EMMI-GSI, and HIC for FAI
Effect of the misorientation of the 4H-SiC substrate on the open volume defects in GaN grown by metal-organic chemical vapor deposition
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The 8Li + 2H reaction studied in inverse kinematics at 3.15 MeV/nucleon using the REX-ISOLDE post-accelerator
12 páginas, 9 figuras, 3 tablas.-- et al.The reaction 8Li + 2H has been studied in inverse kinematics at the incident energy of 3.15 MeV/nucleon, using the REX-ISOLDE post-accelerator. The reaction channels corresponding to (d,p), (d,d), and (d,t) reactions populating ground states and low-lying excited states in 7 -9Li have been identified and the related angular distributions extracted and compared with coupled-channels, distorted-wave Born approximation (DWBA), and coupled-reaction-channels calculations. For the inelastic and (d,t) channels we find that higher order effects are very important and hence one needs to go beyond the simple DWBA to extract reliable structure information from these processes. © 2011 American Physical Society.The financial support of the Swedish Research Council for this work under Grant No. 2008-4158 is gratefully acknowledged, as well as support by the Lars Hierta Memorial Foundation. T. Nilsson acknowledges support through the Royal Swedish Academy of Sciences Research program by a grant from the Knut and Alice Wallenberg Foundation. This work is partially supported by the Spanish Ministerio de Ciencia e Innovacion under Projects No. FPA2006-13807- ´ C02-01, No. FPA2009-08848, No. FPA2009-07653, No. FPA2009-07387, and No. FPA2010-17142 and by the European Union Sixth Framework through RII3-EURONS (Contract No. 506065).Peer Reviewe
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