Description
Svenskt kärnfysikermöte (rum 80101)
Dr
Maria Doncel
(Royal Institute of Technology (KTH))
11/11/2014, 14:00
SFS-KF
Short contribution
In this work we present the preliminary results obtained in the experiment: The evolution of collectiv- ity near the N=Z=50 closed shell in the neutron-deficient nuclei 111I and 113I using DPUNS, performed at the Accelerator Laboratory of the University of Jyva ̈skyla ̈ (Finland).
The aim of the experiment has been to measure the lifetime of excited states in neutron-deficient nuclei by using...
Mr
Vasilis Rakopoulos
(Uppsala University)
11/11/2014, 14:20
SFS-KF
Short contribution
Fission yield data is a key parameter in the design and operation of nuclear power plants. Fission yield distributions depend not only on the fissioning nuclei, but also on the energy and type of the incoming particles inducing fision.
More accurate data could improve both safety and fuel economy of present generation reactors as well as that of future nuclear systems. Improved knowledge of...
Dr
Ulrika Jakobsson
(KTH)
11/11/2014, 14:40
SFS-KF
Short contribution
Recent years have been a particularly active period in the study of neutron-deficient astatine and francium nuclei. For instance new isotopes and new isomers have been reported [1,2,3,4,5], and laser-spectroscopic studies have been performed [6,7]. In this contribution we would like to report on results from in-beam and decay-spectroscopic studies performed in this region using...
Dr
Luis Sarmiento
(Lund University)
11/11/2014, 15:00
SFS-KF
Short contribution
Comprehensive Monte-Carlo simulations using the Geant4 toolkit open
the door for direct nuclear structure insights for a variety of physics
cases, in particular when applied in a self-consistent way, i.e.
confronting simulated data with real experimental data.
Extentions to the Geant4 source code are necessary to extend the
usage of the simulation toolkit to cover, for instance,...
Prof.
Heinz Clement
(Physikalisches Institut, University of Tuebingen)
11/11/2014, 15:50
SFS-KF
Overview talk
Within the program to systematically study the two-pion production in nucleon-nucleon collisions by CELSIUS/WASA also the ominous ABC effect was investigated, which denotes an unusual huge low-mass enhancement in the invariant mass spectrum of an isoscalar pion pair produced in double-pionic fusion process. Due to the lack of convincing explanations the effect got named after Abashian, Booth...
Ms
Lena Heijkenskjöld
(Uppsala University)
11/11/2014, 16:30
SFS-KF
Short contribution
Studies of the decay reactions omega -> pi+ pi- pi0 and omega -> pi+ pi- will be presented. The data used for this study was collected by the WASA-at-COSY collaboration where the omega mesons were produced through the reaction p + d -> 3He + omega. These studies are part of an ongoing PhD project in the nuclear physics group at Uppsala university.
The decay mechanism for the omega -> pi+...
Christian Forssén
(Chalmers University of Technology)
11/11/2014, 16:50
Ms
Sara Asiyeh Changizi
(Royal Institute of Technology (KTH))
12/11/2014, 09:00
SFS-KF
Short contribution
The empirical pairing gaps derived from four different odd-even mass staggering formulae are compared. By performing single-$j$ shell and multi-shell seniority model calculations as well as by using the standard HFB approach with Skryme force we show that the three-point formula $\Delta_C^{(3)}(N)=\frac{1}{2}\left[B(N,Z)+B(N-2,Z)-2B(N-1,Z)\right]$ provides a good measure of the neutron pairing...
Mr
Daniel Ward
(Department of Physics, Lund University)
12/11/2014, 09:20
SFS-KF
Short contribution
Recent experiments [1] have made a first exploration of the low-energy spectroscopy of super heavy elements around Z=115. One uses alpha-gamma-coincidence measurements to probe the low lying states. This calls for a theoretical understanding of the alpha decay and structure in particular of odd nuclei.
In the alpha decay of an odd nucleus the resulting daughter nucleus can often be left in...
Emil Ryberg
(Chalmers University of Technology)
12/11/2014, 09:40
SFS-KF
Short contribution
Proton halos are loosely bound nuclei consisting of a core plus valence proton(s). Compared to neutron halos, a proton halo system is more involved due to the presence of the Coulomb repulsion. We study these systems using the so called Halo, or Cluster, effective field theory (EFT). In this EFT the core of the halo nucleus is treated as a structureless, effective degree-of-freedom. The main...
Stefan Leupold
(Uppsala University)
12/11/2014, 11:00
SFS-KF
Short contribution
speaker: Stefan Leupold
coauthors: M. Hoferichter, B. Kubis, F. Niecknig, S.P. Schneider
abstract: The pion transition form factor denotes the process where a pion converts to a real or virtual photon by emitting another virtual photon. In general, form factors parametrize the deviation from point-like behavior. Therefore the pion transition form factor encodes information about the...
Dr
Patrik Adlarson
(Johannes Gutenberg Universität)
12/11/2014, 11:20
SFS-KF
Short contribution
Precision studies of light mesons decays are used to study a wide range of topics related to fundamental aspects of hadron physics. Besides tests of fundamental symmetries of the Standard Model, precision data of η and η’ decays provide a testing ground for effective field theory. In addition, measurements of the η and η’ transition form factors give valuable information on the hadronic...
Dr
Cui Li
(Uppsala University)
12/11/2014, 11:40
SFS-KF
Short contribution
The Beijing Electron-Positron Collider (BEPCII) is a double ring $e^{+}e^{-}$ collider operating
within a Centre-of-Energy interval of $2.0-4.6$ GeV
with a design luminosity of $1 \times 10^{33}$ cm$^{-2}\textrm{s}^{-1}$.
The Beijing Spectrometer (BESIII) is a large detector located at the BEPCII and has
accumulated the largest sample of $J/\psi$, $\psi(2S)$, and $\psi(3770)$ events for...
Prof.
Arjan Koning
(NRG)
12/11/2014, 13:00
SFS-KF
Overview talk
An overview of the TALYS system for the simulation of nuclear reactions will be given.
Dr
DIEGO TARRIO
(UPPSALA UNIVERSITY)
12/11/2014, 13:40
SFS-KF
Short contribution
Accurate values of the fission cross section of different isotopes are crucial for the development of new nuclear reactors. For that reason, the n_TOF facility at CERN is carrying out an extensive program on neutron-induced reactions. The high-intensity neutron beam covers an unprecedented neutron energy range, from less than 1 eV up to 1 GeV.
In order to study fission reactions, a chamber...
Mr
Oleksiy Fomin
(Uppsala University)
12/11/2014, 14:00
SFS-KF
Short contribution
The results of optimization of the smooth start-up method for the innovative fast reactor (FR) working in the nuclear burning wave (NBW) regime (known also as a Traveling Wave Reactor) are presented. This method has to prevent the excessive increase of neutron flux and energy production in FR at the stage of establishing self-sustained NBW regime mainly due to the lack of neutron-absorbing...
Mr
Erwin Alhassan
(Uppsala University)
12/11/2014, 14:50
SFS-KF
Short contribution
The current nuclear data uncertainties observed in some reactor parameters for some nuclides, calls for safety concern especially with respect to the design of GEN-IV reactors and should therefore be reduced further. In this paper, we present two approaches for incorporating differential experimental data and criticality benchmark information into the Total Monte Carlo methodology for reducing...
Ms
Natasa Lalovic
(Lund University Sweden)
12/11/2014, 15:10
SFS-KF
Short contribution
From 2012 to 2014 the pan-European Advanced GAmma-ray Tracking Array (AGATA) is placed at the German accelerator research centre GSI Darmstadt. Within the PreSPEC collaboration, AGATA is used to perform high-resolution γ-ray spectroscopy of relativistic radioactive ions to obtain unique nuclear structure information of exotic nuclei far away from the line of stability.
In order to evaluate...
Elisabetta Perotti
(Uppsala University)
12/11/2014, 15:30
SFS-KF
Short contribution
speaker: Elisabetta Perotti
coauthor: Stefan Leupold, Carl Niblaeus
We investigate how the lifetime of the eta-prime changes in a thermal system. At high temperatures we expect an increase of the width due to interactions with particles from the heat bath (pions in our approximation). Already at T=120 MeV, the lifetime of the eta-prime seems to become comparable to that of a fireball...
Mr
Michael Papenbrock
(Uppsala University)
12/11/2014, 15:50
SFS-KF
Short contribution
The dp --> 3He eta reaction is known for the unexpected energy dependence of its total cross section, which rises rapidly to its plateau value within the first 1 MeV of excess energy Q. This behaviour has been ascribed to a strong final state interaction and may indicate a quasi-bound eta 3He state. In order to investigate the possibility of spin-dependent contributions to the total cross...
