Target characterization by PIXE, alpha spectrometry and X-ray absorption Kheswa, N.Y.; Papka, P.; Pineda-Vargas, C.A. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
11/2011, Letnik:
655, Številka:
1
Journal Article
Recenzirano
We report on the thickness and homogeneity characterization of thin metallic targets of Zr-96 by means of alpha absorption spectrometry, Particle Induced X-ray Emission (PIXE) and X-ray absorption. ...The target thicknesses determined by means of the above mentioned methods are critically compared. The thicknesses were determined before and after irradiation with a 70
MeV beam of
14N ions.
Resonances in odd-odd 182Ta Brits, C P; Wiedeking, M; FL Bello Garrote ...
EPJ Web of Conferences,
01/2017, Letnik:
146
Conference Proceeding, Journal Article
Recenzirano
Odprti dostop
Enhanced γ-decay on the tail of the giant electric dipole resonance, such as the scissors or pygmy resonances, can have significant impact on (n,γ) reaction rates. These rates are important input for ...modeling processes that take place in astrophysical environments and nuclear reactors. Recent results from the University of Oslo indicate the existence of a significant enhancement in the photon strength function for nuclei in the actinide region due to the scissors resonance. Further, the M1 strength distribution of the scissors resonances in rare earth nuclei has been studied extensively over the years. To investigate the evolution and persistence of the scissor resonance in other mass regions, an experiment was performed utilizing the NaI(Tl) γ-ray detector array (CACTUS) and silicon particle telescopes (SiRi) at the University of Oslo Cyclotron laboratory. Particle-γ coincidences from the 181Ta(d,p)182Ta and 181Ta(d,d')181Ta reactions were used to measure the nuclear level density and photon strength function of the well-deformed 181Ta and 182Ta systems, to investigate the existence of resonances below the neutron separation energy.
Characterisation of thin solid Xe targets Kheswa, N. Y.; Papka, P.; Pineda-Vargas, C. ...
Journal of radioanalytical and nuclear chemistry,
02/2014, Letnik:
299, Številka:
2
Journal Article
Recenzirano
A series of frozen xenon targets of thicknesses ranging between 1 and 15 mg/cm
2
were characterised by elastic backscattering technique using a 3 MeV proton beam. Xenon was kept solid on a gold ...substrate having a thickness of 1 g/cm
2
which was mounted on a cold copper finger. The temperature of targets during the experiment was maintained at 55 K by a compact solid nitrogen sublimation system under pressure of 10
−5
mbar. Targets were used in series of experiments for populating samarium and gadolinium isotopes in the
136
Xe (
18
O, Xn) and
136
Xe (
22
Ne, Xn) nuclear reactions.
An experimental overview of reactions induced by the stable, but weakly-bound nuclei
6Li,
7Li and
9Be, and by the exotic, halo nuclei
6He,
8B,
11Be and
17F on medium-mass targets, such as
58Ni,
59Co ...or
64Zn, is presented. Existing data on elastic scattering, total reaction cross sections, fusion processes, breakup and transfer channels are discussed in the framework of a CDCC approach taking into account the breakup degree of freedom.
To date, the two-nucleon pick-up and stripping counterparts of the (p,t) and (t,p) reactions, the ( super(3)He,n) and (n, super(3)He) reactions, have been poorly investigated due to the difficulty in ...performing high-resolution measurements of fast-neutron energies. This experimental limitation has hindered a full understanding of the role of proton pairing in nuclei.
Two pairs of positive-and negative-parity doublet bands together with eight strong electric dipole transitions linking their yrast positive- and negative-parity bands have been identified in ^{78}Br. ...They are interpreted as multiple chiral doublet bands with octupole correlations, which is supported by the microscopic multidimensionally-constrained covariant density functional theory and triaxial particle rotor model calculations. This observation reports the first example of chiral geometry in octupole soft nuclei.
Excited states of 80Br have been investigated via the 76Ge(11B, α3n) and 76Ge(7Li, 3n) reactions and a new ΔI=1 band has been identified which resides ∼ 400 keV above the yrast band. Based on the ...experimental results and their comparison with the triaxial particle rotor model calculated ones, a chiral character of the two bands within the πg9/2⊗νg9/2 configuration is proposed, which provides the first evidence for chirality in the A∼80 region.
Measurement of neutron production from an 18O target Ngcobo, P.Z.; Bark, R.A.; Buffler, A. ...
Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms,
02/2022, Letnik:
513
Journal Article
Recenzirano
Neutron yields and cross-sections from the bombardment, by protons of energies 30, 42, 54 and 66 MeV, on thin 18O water targets, and a 2.5 mm thick Li target, have been measured at 0∘ and 16∘, in ...addition to that of a stopping length 18O water target at 62 MeV. The results are compared with measured yields from beryllium targets and with FLUKA simulations.
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