Thu·Mar 22, 2018Thursday·March 22, 2018

1. 01*

   New measurements of excitation functions of 186W(p,x) nuclear reactions up to 65 MeV. Production of 178W/178mTa generator

   F. Tárkányi🇭🇺 · F. Ditrói🇭🇺 · S. Takács🇭🇺 · A. Hermanne

   New experimental excitation functions for proton induced reactions on natW are presented in the 32- 65 MeV energy range. The cross sections for natW(p,xn)186,184,183,182m,182g,181Re, naW(p,x)178W, natW(p,x)183,182,180m,177,176,175Ta, 175Hf, 177Lu were measured via an activation method by using a stacked-foil irradiation technique and high resolution gamma-ray spectrometry. The results were compared with predicted values obtained with the nuclear reaction model code TALYS (results taken from TENDL-2014 and TENDL-2015 on-line library). Production routes of the medically relevant radionuclides 186Re, 178W 178Ta and 181W are discussed.

   nucl-exNucl.Instrum.Meth.B(2017)·3 citations
2. 02*

   Activation cross-section data for alpha-particle induced nuclear reactions on natural ytterbium for some longer lived radioisotopes

   F. Tárkányi🇭🇺 · F. Ditrói🇭🇺 · S. Takács🇭🇺 · A. Hermanne · B. Király

   Additional experimental cross sections were deduced for the long half-life activation products (172Hf and 173Lu) from the alpha particle induced reactions on ytterbium up to 38 MeV from late, long measurements and for 175Yb, 167Tm from a re-evaluation of earlier measured spectra. The cross-sections are compared with the earlier experimental datasets and with the data based on the TALYS theoretical nuclear reaction model (available in the TENDL-2014 and 2015 libraries) and the ALICE-IPPE code.

   nucl-exstat.APJ.Radioanal.Nucl.Chem.(2017)·2 citations
3. 03*

   Activation cross sections of deuteron induced reactions on silver in the 33-50 MeV energy range

   F. Ditrói🇭🇺 · F. Tárkányi🇭🇺 · S. Takács🇭🇺 · A. Hermanne · A.V. Ignatyuk

   Excitation functions were measured for the ${}^{nat}$Ag(d,x)${}^{105,104}$Cd, ${}^{110m,108m,106m,105g,104g}$Ag and ${}^{101}$Pd, ${}^{105,101m}$Rh reactions over the energy range 33 50 MeV by using the stacked foil activation technique and subsequent high-resolution gamma spectrometry. We present the first experimental cross section data above 40 MeV for all of these reactions and the first experimental cross section data for ${}^{nat}$Ag(d,x)${}^{108m,104g}$Ag and ${}^{105,103}$Rh. The experimental data are compared with results of the model calculations performed with the ALICE D, EMPIRE D theoretical nuclear reaction model codes and with the TALYS code results as available in the TENDL2014 and 2015 on-line libraries.

   nucl-exAppl.Radiat.Isot.(2017)·0 citations
4. 04*

   Extension of activation cross section data of long lived products in deuteron induced nuclear reactions on platinum up to 50 MeV

   F. Ditrói🇭🇺 · F. Tárkányi🇭🇺 · S. Takács🇭🇺 · A. Hermanne

   In the frame of a systematical study of light ion induced nuclear reactions on platinum, activation cross sections for deuteron induced reactions were investigated. Excitation functions were measured in the 20.8 - 49.2 MeV energy range for the natPt(d,xn)191,192,193,194,195,196m2,196g,198g,199Au, natPt(d,x)188,189,191,195m,197m,197gPt and natPt(d,x)189,190,192,194m2Ir reactions by using the stacked foil irradiation technique. The experimental results are compared with previous results from the literature and with the theoretical predictions in the TENDL-2014 and TENDL-2015 libraries. The applicability of the produced radio-tracers for wear measurements has been presented.

   nucl-exNucl.Instrum.Meth.B(2017)·1 citation
5. 05*

   Activation cross-sections of longer lived radioisotopes of proton induced nuclear reactions on terbium up to 65 MeV

   F.Tárkányi🇭🇺 · A. Hermanne · F. Ditrói🇭🇺 · S. Takács🇭🇺 · A. V. Ignatyuk

   Experimental cross sections are presented for the 159Tb(p,xn)153,155,157,159Dy, 152,153,155,156m2,m1,g,158Tb and 153,151Gd nuclear reactions up to 65 MeV. The experimental results are compared with the recently reported experimental data and with the results of the nuclear reaction codes ALICE-IPPE, EMPIRE and TALYS as reported in the TENDL-2015 on-line library. Integral thick-target yields are also derived for the reaction products used in practical applications and production routes are discussed.

   nucl-exAppl.Radiat.Isot.(2017)·4 citations
6. 06*

   Investigation of activation cross sections for deuteron induced reactions on strontium up to 50 MeV

   F. Tárkányi · A. Hermanne · F. Ditrói🇭🇺 · S. Takács🇭🇺 · Z. Szücs · K. Brezovcsik

   Excitation functions were measured for the natSr(d,x)88,87m,87g,86g,85gY, 87m,85g,83g,82Sr, 86g,84g,83,82m, 81gRb reactions by the stacked foil activation technique and high-resolution gamma-spectrometry up to 50 MeV. We present the first experimental activation cross section data for all investigated reactions. Our experimental data are compared with the TALYS code results as available in the TENDL-2015 on-line library. Use of deuteron induced reactions on Sr for production of medical isotopes is discussed.

   nucl-exAppl.Radiat.Isot.(2017)·3 citations
7. 07*

   Activation cross section data of proton induced nuclear reactions on lanthanum in the 34-65 MeV energy range and application for production of medical radionuclides

   F. Tárkányi🇭🇺 · A. Hermanne · F. Ditrói🇭🇺 · S. Takács🇭🇺

   Activation cross sections of the natLa(p,x)139,137m,137g,135,134,133mCe, natLa(p,x)135,134,133La and 133m,133g,131Ba nuclear reactions have been measured experimentally, for the first time (except 139Ce). Cross-sections in the 34-64 MeV energy range were obtained through an activation method combining the stacked foil irradiation technique and gamma-ray spectrometry. The experimental cross sections were compared with the theoretical prediction in the TENDL-2014 and TENDL-2015, TALYS based libraries. Applications in the field of medical radionuclides production is discussed.

   nucl-exJ.Radioanal.Nucl.Chem.(2017)·7 citations
8. 08*

   Investigation of activation cross sections of proton induced reactions on rhodium up to 70 MeV for practical applications

   F. Tárkányi🇭🇺 · F. Ditrói🇭🇺 · S. Takács🇭🇺 · A. Hermanne · M. Baba · H. Yuki · A.V. Ignatyuk

   Excitation functions were measured for the production of the 101,100Pd, 102m, 102g,101m,101g,100,99m,99gRh and 97Ru radionuclides by bombardment of 103Rh targets with proton beams up to 70 MeV, some of them for the first time. The new results are compared with the earlier experimental data and with the theoretical nuclear model code calculations from ALICE-IPPE, EMPIRE and TALYS 1.6. Thick target yields were deduced and possible application of the new data for production of medically relevant 101m,101gRh and 97Ru are discussed.

   nucl-exNucl.Instrum.Meth.B(2017)·0 citations
9. 09*

   Investigation of $\alpha$-induced reactions on Sb isotopes relevant to the astrophysical $\gamma$-process

   Z. Korkulu🇯🇵 · N. Özkan🇹🇷 · G. G. Kiss🇭🇺 · T. Szücs🇭🇺 · Gy. Gyürky🇭🇺 · Zs. Fülöp🇭🇺 · R. T. Güray · Z. Halász · T. Rauscher🇬🇧 · E. Somorjai · Zs. Török · C. Yalçın

   The aim of the present work is to measure the ${}^{121}$Sb($\alpha ,\gamma$)${}^{125}$I, ${}^{121}$Sb($\alpha$,n)${}^{124}$I, and ${}^{123}$Sb($\alpha$,n)${}^{126}$I reaction cross sections. The $\alpha$-induced reactions on natural and enriched antimony targets were investigated using the activation technique. The ($\alpha$,$\gamma$) cross sections of ${}^{121}$Sb were measured and are reported for first time. To determine the cross section of the ${}^{121}$Sb($\alpha$,$\gamma$)${}^{125}$I, ${}^{121}$Sb($\alpha$,n)${}^{124}$I, and ${}^{123}$Sb($\alpha$,n)${}^{126}$I reactions, the yields of $\gamma$-rays following the $\beta$-decay of the reaction products were measured. For the measurement of the lowest cross sections, the characteristic X-rays were counted with a LEPS (Low Energy Photon Spectrometer) detector. The cross section of the ${}^{121}$Sb($\alpha$,$\gamma$)${}^{125}$I, ${}^{121}$Sb($\alpha$,n)${}^{124}$I and ${}^{123}$Sb($\alpha$,n)${}^{126}$I reactions were measured with high precision in an energy range between 9.74 MeV to 15.48 MeV, close to the astrophysically relevant energy window. The results are compared with the predictions of statistical model calculations. The ($\alpha$,n) data show that the $\alpha$ widths are predicted well for these reactions. The ($\alpha$,$\gamma$) results are overestimated by the calculations but this is due to the applied neutron- and $\gamma$ widths. Relevant for the astrophysical reaction rate is the $\alpha$ width used in the calculations.While for other reactions the $\alpha$ widths seem to have been overestimated and their energy dependence was not described well in the measured energy range, this is not the case for the reactions studied here. The result is consistent with the proposal that additional reaction channels, such as Coulomb excitation, may have led to the discrepancies found in other reactions.

   nucl-exPRC(2018)·19 citations
10. 10*

    Measurement of activation cross-section of long-lived products in deuteron induced nuclear reactions on palladium in the 30-50 MeV energy range

    F. Ditrói🇭🇺 · F. Tárkányi🇭🇺 · S. Takács🇭🇺 · A. Hermanne · A.V. Ignatyuk

    Excitation functions were measured in the 31 - 49.2 MeV energy range for the natPd(d,xn)111,110m,106m,105,104g,103Ag, natPd(d,x) 111m,109,101,100Pd, natPd(d,x), 105,102m,102g,101m,101g,100,99m,99gRh and natPd(d,x)103,97Ru nuclear reactions by using the stacked foil irradiation technique. The experimental results are compared with our previous results and with the theoretical predictions calculated with the ALICE-D, EMPIRE-D and TALYS (TENDL libraries) codes.

    nucl-exAppl.Radiat.Isot.(2017)·0 citations
11. 11*

    Towards observation of three-nucleon short-range correlations in high Q^2 A(e, e')X reactions

    Donal B. Day Leonid L. Frankfurt · Misak M. Sargsian · Mark I. Strikman

    We present a detailed study of kinematical and dynamical conditions necessary for probing highly elusive three-nucleon short range correlations~(3N-SRCs) in nuclei through inclusive electron scattering. The kinematic requirements that should be satisfied in order to isolate 3N-SRCs in inclusive processes are derived. We demonstrate that a sequence of two short-range NN interactions represents the main mechanism for 3N-SRCs in inclusive processes. Within this mechanism we predict a quadratic dependence of the inclusive cross section ratios of nuclei to ${}^3$He in the 3N-SRC region to the same ratio measured in 2N-SRC domain. The extended analysis of the available data satisfying the necessary 3N-SRC kinematical conditions is presented. This analysis provides tantalizing signatures of scaling associated with the onset of 3N-SRC dominance. The same data are also consistent with the prediction of the quadratic relation between the ratios measured in the 3N and 2N-SRC regions for nuclei ranging $4\le A\le 197$. This agreement made it possible to extract $a_3(A)$, the probability of 3N-SRCs relative to the A=3 nucleus. We find $a_3(A)$ to be significantly larger in magnitude than the analogous parameter, $a_2(A)$, for 2N-SRCs.

    ↳ nucl-thhep-exhep-phnucl-exPRC(2023)·18 citations
12. 12*

    Prolate-to-oblate shape phase transitions in neutron-rich odd-mass nuclei

    K. Nomura🇫🇷 · R. Rodríguez-Guzmán🇰🇼 · L. M. Robledo🇪🇸

    We investigate the prolate-to-oblate shape phase transitions in the neutron-rich Pt, Os and Ir nuclei in the mass $A\approx 190$ region. The Hamiltonian of the interacting boson-fermion model, used to describe the odd-mass ${}^{185-199}$Pt, ${}^{185-193}$Os and ${}^{185-195}$Ir isotopes, is partially constructed by using as a microscopic input the results of constrained self-consistent mean-field calculations within the Hartree-Fock-Bogoliubov method with the Gogny force. The remaining few parameters are adjusted to experimental data in the odd systems. In this way the calculations reasonably describe the spectroscopic properties of the odd-mass systems considered. Several calculated observables for the odd-mass nuclei, especially the low-energy excitation spectra and the effective deformation parameters, point to a prolate-oblate shape transition as a function of the neutron number for all the isotopic chains considered and similar to the one already observed in the neighboring even-even systems.

    ↳ nucl-thnucl-exPRC(2018)·17 citations
13. 13*

    Microscopic description of triaxiality in Ru isotopes with covariant energy density functional theory

    Z. Shi🇨🇳 · Z. P. Li

    The triaxiality in nuclear low-lying states has attracted great interests for many years. Recently, the reduced transition probabilities for levels near the ground state in ${}^{110}$Ru have been measured and provided strong evidences for a triaxial shape of this nucleus. The aim of this work is to provide a microscopic study of low-lying states for the Ru isotopes with $A\sim 100$ and to examine in detail the role of triaxiality, and the evolution of quadrupole shapes with the isospin and spin degrees of freedom. The low-lying excitation spectra and transition probabilities of even-even Ru isotopes are described at the beyond mean-field level by solving a five-dimensional collective Hamiltonian with parameters determined by constrained self-consistent mean-field calculations based on the relativistic energy density functional PC-PK1. The calculated energy surfaces, low-energy spectra, intraband and interband transition rates, as well as some characteristic collective observables, such as $E(4_{g.s.}^{+})/E(2_{g.s.}^{+})$, $E(2_{\gamma }^{+})/E(4_{g.s.}^{+})$, $B(E2;2_{g.s.}^{+}\to 0_{g.s.}^{+})$, and $\gamma$ band staggerings are in a good agreement with the available experimental data. The main features of the experimental low-lying excitation spectra and electric transition rates are well reproduced, and thus strongly support the onset of triaxiality in the low-lying excited states of the Ru isotopes around ${}^{110}$Ru.

    ↳ nucl-thnucl-exPRC(2018)·21 citations
14. 14*

    Mean free path and shear viscosity in central ${}^{129}$Xe+${}^{119}$Sn collisions below 100 MeV/nucleon

    H. L. Liu🇨🇳 · Y. G. Ma🇨🇳 · A. Bonasera🇺🇸 · X. G. Deng🇨🇳 · O. Lopez🇫🇷 · M. Veselský🇸🇰

    Thermal and transport properties of hot nuclear matter formed in central ${}^{129}$Xe + ${}^{119}$Sn collisions at the Fermi energy are investigated using the isospin-dependent quantum molecular dynamical (IQMD) model. Temperature ($T$), average density ($\rho$), chemical potential ($\mu$), mean momentum ($P$), shear viscosity ($\eta$) and entropy density ($s$) are obtained from the phase-space information. The mean free path (${\lambda }_{nn}$) and the in-medium nucleon-nucleon cross section (${\sigma }_{nn}$) in the highest compressible stage at different incident energies are deduced and compared with the experimental results from Phys. Rev. C $90$ (2014) 064602. The result shows that ${\lambda }_{nn}$ and ${\sigma }_{nn}$ have the same trend and similar values as the experimental results when the beam energy is greater than 40 MeV/u at maximum compressed state. Furthermore, the derived shear viscosity over entropy density ($\eta /s$) shows a decreasing behaviour to a saturated value around $\frac{3}{4\pi }$ as a function of incident energy.

    ↳ nucl-thnucl-exPRC(2017)·18 citations
15. 15*

    Photonuclear reaction as a probe for $\alpha$-clustering nuclei in the quasi-deuteron region

    B. S. Huang🇺🇸 · Y. G. Ma🇨🇳 · W. B. He

    Photon-nuclear reaction in a transport model frame, namely an Extended Quantum Molecular Dynamics (EQMD) model, has been realised at the photon energy of 70-140 MeV in the quasi-deuteron (QD) regime. For an important application, we pay a special focus on photonuclear reactions of ${}^{12}$C($\gamma$,np)${}^{10}$B where ${}^{12}$C is considered as different configurations including $\alpha$-clustering. Obvious differences for some observables have been observed among different configurations, which can be attributed to spatial-momentum correlation of a neutron-proton pair inside nucleus, and therefore it gives us a sensitive probe to distinguish the different configurations including $\alpha$ clustering with the help of the photonuclear reaction mechanism.

    ↳ nucl-thnucl-exPRC(2017)·42 citations
16. 16*

    Collective flows of ${}^{16}$O + ${}^{16}$O collisions with $\alpha$-clustering configurations

    Chen-Chen Guo · Wan-Bing He🇨🇳 · Yu-Gang Ma🇨🇳

    The main purpose of the present paper is to discuss whether or not the collective flows in heavy-ion collision at Fermi energy can be taken as a tool to investigate the cluster configuration in light nuclei. In practice, within an Extended Quantum Molecular Dynamics model, four $\alpha$-clustering (linear chain, kite, square, and tetrahedron) configurations of ${}^{16}$O are employed in the initialization, ${}^{16}$O+${}^{16}$O around Fermi energy (40 - 60 MeV$/$nucleon) with impact parameter 1 - 3 fm are simulated, the directed and elliptic flows are analyzed. It is found that collective flows are influenced by the different $\alpha$-clustering configurations, and the directed flow of free protons is more sensitive to the initial cluster configuration than the elliptic flow. Nuclear reaction at Fermi energy can be taken a useful way to study cluster configuration in light nuclei.

    ↳ nucl-thnucl-exChin.Phys.Lett.(2017)·15 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.