Development of a versatile multiaperture negative ion source
M. Cavenago, T. Kulevoy, S. Petrenko, G. Serianni, V. Antoni et al.
A 60 kV ion source (9 beamlets of 15 mA each of H) and plasma generators are being developed at Consorzio RFX and INFN-LNL, for their versatility in experimental campaigns and for training. Unlike most experimental sources, the design aimed at continuous operation. Magnetic configuration can achieve ... [Rev. Sci. Instrum. 83, 02A707 (2012)] published Mon Feb 13, 2012.
Numerical simulation of gridded electrostatic lens
G. N. Kropachev, N. N. Alexeev, A. I. Balabin, T. V. Kulevoy, and V. I Nikolaev
Gridded electrostatic lenses are frequently used in extraction systems and low energy ion beam transport line. Typically, for numerical simulation the grid is treated as a metal plate transparent for beam particles. The influence of real grid geometry on the beam dynamics in the gridded lens has bee ... [Rev. Sci. Instrum. 83, 02B907 (2012)] published Mon Feb 13, 2012.
Study on the beam transport from the Bio-Nano ECRIS
T. Uchida, H. Minezaki, K. Oshima, R. Racz, M. Muramatsu et al.
The beam transport of N ion and C ion in the Bio-Nano ECRIS with min-B configuration was investigated based on the ion beam profiles. The N beam could be focused under the low-beam current conditions. Also the C beam could be focused in spite of the large space-charge effect which will lead the dive ... [Rev. Sci. Instrum. 83, 02B713 (2012)] published Mon Feb 13, 2012.
Use of a wire scanner for monitoring residual gas ionization in Soreq Applied Research Accelerator Facility 20 keV/u proton/deuteron low energy beam transport beam line
B. Vainas, I. Eliyahu, L. Weissman, and D. Berkovits
The ion source end of the Soreq Applied Research Accelerator Facility accelerator consists of a proton/deuteron ECR ion source and a low energy beam transport (LEBT) beam line. An observed reduction of the radio frequency quadrupole transmission with increase of the LEBT current prompted additional ... [Rev. Sci. Instrum. 83, 02B712 (2012)] published Mon Feb 13, 2012.
Deuteron injector for Peking University Neutron Imaging Facility project
H. T. Ren, S. X. Peng, P. N. Lu, Q. F. Zhou, Z. X. Yuan et al.
The deuteron injector developed for the PKUNIFTY (Peking University Neutron Imaging Facility) has been installed and commissioned at Peking University (PKU). The injector system must transfer 50 keV 50 mA of D ion beam to the entrance of the 2 MeV radio frequency quadrupole (RFQ) with 10% duty facto ... [Rev. Sci. Instrum. 83, 02B711 (2012)] published Mon Feb 13, 2012.
A new extraction system for the Linac4 Hion source
O. Midttun, T. Kalvas, M. Kronberger, J. Lettry, H. Pereira et al.
As part of the CERN accelerator complex upgrade, a new linear accelerator for H (Linac4) is under construction. The ion source design is based on the non-caesiated DESY RF-driven ion source, with the goal of producing an H beam of 80 mA beam current, 45 keV beam energy, 0.4 ms pulse length, and 2 Hz ... [Rev. Sci. Instrum. 83, 02B710 (2012)] published Mon Feb 13, 2012.
Correlation between the plasma parameters and the extracted current density in the volume-production based sources of negative hydrogen ions
St. Lishev, A. Shivarova, and Kh. Tarnev
Unified description of a volume-production based source of negative hydrogen ions, including its three regionsthe driver, the plasma expansion through the magnetic filter, and the extraction of the ions at the position of the first electrode of the extraction systemis presented within a two-dimensio ... [Rev. Sci. Instrum. 83, 02A709 (2012)] published Mon Feb 13, 2012.
Erratum: Calculation of the Transition from Pairing Vibrational to Pairing Rotational Regimes between Magic Nuclei Sn and Sn via Two-Nucleon Transfer Reactions [Phys. Rev. Lett. 107, 092501 (2011)]
G. Potel, F. Barranco, F. Marini, A. Idini, E. Vigezzi et al.
Abstract not available. [Phys. Rev. Lett. 108, 069904 ] published .
Experimental Determination of In-Medium Cluster Binding Energies and Mott Points in Nuclear Matter
K. Hagel, R. Wada, L. Qin, J. B. Natowitz, S. Shlomo et al.
In-medium binding energies and Mott points for d, t, He and alpha clusters in low-density nuclear matter have been determined at specific combinations of temperature and density in low-density nuclear matter produced in collisions of 47A MeV Ar and Zn projectiles with Sn and Sn target nuclei. The ex ... [Phys. Rev. Lett. 108, 062702 ] published .
Evidence for a Smooth Onset of Deformation in the Neutron-Rich Kr Isotopes
M. Albers, N. Warr, K. Nomura, A. Blazhev, J. Jolie et al.
The neutron-rich nuclei Kr were studied via projectile Coulomb excitation at the REX-ISOLDE facility at CERN. Level energies of the first excited 2 states and their absolute E2 transition strengths to the ground state are determined and discussed in the context of the E(2) and B(E2;2-->0) systematic ... [Phys. Rev. Lett. 108, 062701 ] published .
Q Value and Half-Lives for the Double-beta-Decay Nuclide Pd
D. Fink, J. Barea, D. Beck, K. Blaum, Ch. Bohm et al.
The Pd double-beta decay Q value was measured with the Penning-trap mass spectrometer ISOLTRAP to be Q=2017.85(64) keV. This value shifted by 14 keV compared with the literature value and is 17 times more precise, resulting in new phase-space factors for the two-neutrino and neutrinoless decay mode ... [Phys. Rev. Lett. 108, 062502 ] published .
Protoneutron Star Cooling with Convection: The Effect of the Symmetry Energy
L. F. Roberts, G. Shen, V. Cirigliano, J. A. Pons, S. Reddy et al.
We model neutrino emission from a newly born neutron star subsequent to a supernova explosion to study its sensitivity to the equation of state, neutrino opacities, and convective instabilities at high baryon density. We find the time period and spatial extent over which convection operates is sensi ... [Phys. Rev. Lett. 108, 061103 ] published .
Fusion of Ca+Ca and other Ca+Ca systems near and below the barrier
G. Montagnoli, A. M. Stefanini, C. L. Jiang, H. Esbensen, L. Corradi et al.
The fusion excitation function of Ca+Ca has been measured from well above the Coulomb barrier, down to low energies where the cross section is as small as ~=20 [mu]b, and the astrophysical S factor possibly reaches a maximum vs energy. The results of coupled-channels calculations using the M3Y+repul ... [Phys. Rev. C 85, 024607 ] published .
Surface term optical model nonlocality in the NA elastic scattering process
M. I. Jaghoub
A novel source of nonlocality was introduced into the optical potential in a previous work. We expressed the nonlocality in the form of a surface term, which is proportional to the gradient of the nuclear matter density of the target nucleus. In this work, we have tested the suitability of the surfa ... [Phys. Rev. C 85, 024606 ] published .
High-resolution study of Gamow-Teller transitions via the Fe(He,t)Co reaction
T. Adachi, Y. Fujita, A. D. Bacher, G. P. A. Berg, T. Black et al.
The Gamow-Teller transition strengths, B(GT), in pf-shell nuclei are of interest in nuclear physics as well as in nuclear astrophysics. A high-resolution (He,t) charge-exchange (CE) reaction was performed on the T=+1 nucleus Fe at 0 and at an intermediate incident energy of 140 MeV/nucleon for the s ... [Phys. Rev. C 85, 024308 ] published .
Subtraction of the spurious translational mode from the random-phase approximation response function
Kazuhito Mizuyama and Gianluca Colo
It is well known that within self-consistent random-phase approximation (RPA) on top of Hartree-Fock (HF), the translational symmetry should be restored. Because of approximations at the level of the practical implementation, this restoration may be only partial. As a result, one has spurious contri ... [Phys. Rev. C 85, 024307 ] published .
Calculated fission yields of neutron-deficient mercury isotopes
Peter Moller, Jorgen Randrup, and Arnold J. Sierk
The recent unexpected discovery of asymmetric fission of Hg following the electron-capture decay of Tl has led to intense interest in experimentally mapping the fission-yield properties over more extended regions of the nuclear chart and compound-system energies. We present here a first calculation ... [Phys. Rev. C 85, 024306 ] published .
Development of low-energy and high-current-density ion beam system
H. Sakakita, S. Kiyama, Y. Hirano, H. Koguchi, T. Shimada et al.
A low-energy ion beam system operating at a dc voltage of less than 300 V was developed using an ion source with a multicusp magnetic field. A high-current-density ion beam of 6.9 mA/cm was successfully extracted at the electrode. The beam extraction characteristics for flat and concave electrodes w ... [Rev. Sci. Instrum. 83, 02B708 (2012)] published Fri Feb 10, 2012.
Use of the focusing multi-slit ion optical system at RUssian Diagnostic Injector (RUDI)
A. Listopad, J. Coenen, V. Davydenko, A. Ivanov, V. Mishagin et al.
The upgrade of the diagnostic neutral beam injector RUDI in 2010 was performed to increase the beam density at the focal plane in accordance with the requirements of charge-exchange recombination spectroscopy diagnostics. A new focusing ion-optical system (IOS) with slit beamlets and an enlarged ape ... [Rev. Sci. Instrum. 83, 02B707 (2012)] published Fri Feb 10, 2012.
A 2.45 GHz electron cyclotron resonance proton ion source and a dual-lens low energy beam transport
W. H. Zhang, H. Y. Ma, Y. Yang, Q. Wu, X. Z. Zhang et al.
The structure and preliminary commissioning results of a new 2.45 GHz ECR proton ion source and a dual-lens low energy beam transport (LEBT) system are presented in this paper. The main magnetic field of the ion source is provided by a set of permanent magnets with two small electro-solenoid magnets ... [Rev. Sci. Instrum. 83, 02A329 (2012)] published Fri Feb 10, 2012.
Development of DRAGON electron cyclotron resonance ion source at Institute of Modern Physics
W. Lu, D. Z. Xie, X. Z. Zhang, B. Xiong, L. Ruan et al.
A new room temperature electron cyclotron resonance (ECR) ion source, DRAGON, is under construction at IMP. DRAGON is designed to operate at microwaves of frequencies of 14.518 GHz. Its axial solenoid coils are cooled with evaporative medium to provide an axial magnetic mirror field of 2.5 T at the ... [Rev. Sci. Instrum. 83, 02A328 (2012)] published Fri Feb 10, 2012.
Improvement of efficiency and temperature control of induction heating vapor source on electron cyclotron resonance ion source
T. Takenaka, R. Kiriyama, M. Muramatsu, A. Kitagawa, T. Uchida et al.
An electron cyclotron resonance ion source (ECRIS) is used to generate multicharged ions for many kinds of the fields. We have developed an evaporator by using induction heating method that can generate pure vapor from solid state materials in ECRIS. We develop the new matching and protecting circui ... [Rev. Sci. Instrum. 83, 02A327 (2012)] published Fri Feb 10, 2012.
First Measurement of the Partial Widths of Bi Decay to the Ground and to the First Excited States
J. W. Beeman, M. Biassoni, C. Brofferio, C. Bucci, S. Capelli et al.
Bi alpha decay to the ground and to the first excited state have been recently observed for the first time with a large BGO scintillating bolometer. The half-life of Bi is determined to be tau=(2.010.08) x 10 yr while the branching ratio for the ground-state to ground-state transition is (98.80.3) ... [Phys. Rev. Lett. 108, 062501 ] published .
Electron shielding of vortons in high-density quark matter
Paulo F. Bedaque, Evan Berkowitz, Geoffrey Ji, and Nathan Ng
We consider the effect of the electron cloud about a vorton in the CFL-K high-density phase by numerically solving the ultrarelativistic Thomas-Fermi equation about a toroidal charge. Including electrons removes the electric monopole contribution to the energy, and noticeably decreases the equilibri ... [Phys. Rev. D 85, 043008 ] published .
Binding energy of C
H. T. Fortune and R. Sherr
The sensitivity of the calculated matter radius to the binding energy is exploited to estimate the 2n binding energy of C, using a recent experimental value of R=5.4(9) fm. The result is B<220 keV, significantly smaller than another recent estimate. ... [Phys. Rev. C 85, 027303 ] published .
Low-spin structure of Se and the betan branching of As
J. Kurpeta, W. Urban, T. Materna, H. Faust, U. Koster et al.
Fission fragments from neutron-induced fission of U produced at the high-flux reactor of the Institut Laue-Langevin, Grenoble, were separated with the Lohengrin separator to provide a beam of neutron-rich As nuclei. The beta decay of As to Se was studied using gamma-gamma and beta-gamma coincide ... [Phys. Rev. C 85, 027302 ] published .
Sensitivity of the neutron star r-mode instability window to the density dependence of the nuclear symmetry energy
De-Hua Wen, W. G. Newton, and Bao-An Li
Using a simple model of a neutron star with a perfectly rigid crust constructed with a set of crust and core equations of state that span the range of nuclear experimental uncertainty in the symmetry energy, we calculate the instability window for the onset of the Chandrasekhar-Friedmann-Schutz inst ... [Phys. Rev. C 85, 025801 ] published .
beta decay of Cl: Precision gamma-ray spectroscopy and a measurement of isospin-symmetry breaking
D. Melconian, S. Triambak, C. Bordeanu, A. Garcia, J. C. Hardy et al.
Background: Models to calculate small isospin-symmetry-breaking effects in superallowed Fermi decays have been placed under scrutiny in recent years. A stringent test of these models is to measure transitions for which the correction is predicted to be large. The decay of Cl decay provides such a te ... [Phys. Rev. C 85, 025501 ] published .
gamma-charge correlation in heavy ion collisions: Various approaches
Prithwish Tribedy, Subhasis Chattopadhyay, and Aihong Tang
Event-by-event gamma-charge (gamma-ch) correlation is studied for systems going through QCD chiral phase transition. In this paper, various methods for measuring gamma-ch correlation in heavy ion collisions are discussed. Dynamical fluctuation due to the formation of domains of disoriented chiral co ... [Phys. Rev. C 85, 024902 ] published .
Single-nucleon potential decomposition of the nuclear symmetry energy
Rong Chen, Bao-Jun Cai, Lie-Wen Chen, Bao-An Li, Xiao-Hua Li et al.
The nuclear symmetry energy E(rho) and its density slope L(rho) can be decomposed analytically in terms of the single-nucleon potential in isospin asymmetric nuclear matter. Using three popular nuclear effective interaction models which have been extensively used in nuclear structure and reaction st ... [Phys. Rev. C 85, 024305 ] published .
Intense beams from gases generated by a permanent magnet ECR ion source at PKU
H. T. Ren (任海涛), S. X. Peng (彭士香), P. N. Lu (吕鹏南), S. Yan (颜莎), Q. F. Zhou (周泉丰) et al.
An electron cyclotron resonance (ECR) ion source is designed for the production of high-current ion beams of various gaseous elements. At the Peking University (PKU), the primary study is focused on developing suitable permanent magnet ECR ion sources (PMECRs) for separated function radio frequency ... [Rev. Sci. Instrum. 83, 02B905 (2012)] published Thu Feb 9, 2012.
Progress towards the development of a realistic electron cyclotron resonance ion source extraction model
D. Winklehner, D. Leitner, J. Y. Benitez, C. M. Lyneis, and M. M. Strohmeier
In this paper, an ongoing effort to provide a simulation and design tool for electron cyclotron resonance ion source extraction and low energy beam transport is described and benchmarked against experimental results. Utilizing the particle-in-cell code WARP, a set of scripts has been developed: A se ... [Rev. Sci. Instrum. 83, 02B706 (2012)] published Thu Feb 9, 2012.
First commissioning results with the Grenoble test electron cyclotron resonance ion source at iThemba LABS
R. Thomae, J. Conradie, H. Delsink, H. Du Plessis, D. Fourie et al.
iThemba Laboratory for Accelerator Based Science (iThemba LABS) is a multi-disciplinary accelerator facility. One of its main activities is the operation of a separated-sector cyclotron with a K-value of 200, which provides beams of various ion species. These beams are used for fundamental nuclear p ... [Rev. Sci. Instrum. 83, 02A323 (2012)] published Thu Feb 9, 2012.
Design of a compact electron cyclotron resonance ion source for medium charge state light ions
D. Button, M. A. C. Hotchkis, and G. N. Milford
At the Australian Nuclear Science and Technology Organization we are developing a new isotope ratio mass spectrometer based on the measurement of multiple charge state ions. We have carried out a review of our existing ECR ion source and identified a number of design flaws. For the new instrument, w ... [Rev. Sci. Instrum. 83, 02A322 (2012)] published Thu Feb 9, 2012.
Reliability test of an electron cyclotron resonance ion source for accelerator driven sub-critical system
B. Cui, B. Tang, R. Ma, Q. Huang, Y. Ma et al.
The reliability test of an electron cyclotron resonance ion source developed for accelerator driven sub-critical system is carried out in China Institute of Atomic Energy. A unique technique to improve the reliability is adopted. The source is operated for more than 200 h at 75 keV, 100 mA extracted ... [Rev. Sci. Instrum. 83, 02A321 (2012)] published Thu Feb 9, 2012.
Nuclear energy density optimization: Large deformations
M. Kortelainen, J. McDonnell, W. Nazarewicz, P.-G. Reinhard, J. Sarich et al.
A new Skyrme-like energy density suitable for studies of strongly elongated nuclei was determined in the framework of the Hartree-Fock-Bogoliubov theory using the recently developed model-based, derivative-free optimization algorithm pounders. A sensitivity analysis at the optimal solution has revea ... [Phys. Rev. C 85, 024304 ] published .
He-triton cluster states in Li
Yoshiko Kanada-En'yo and Tadahiro Suhara
Cluster states in Li are investigated with calculations of a He-t cluster model. Results suggest He-t cluster states near the He-t threshold energy. These states construct a K=1/2 band and their neutron configuration is similar to that of the K=0 band in Be. ... [Phys. Rev. C 85, 024303 ] published .
Nuclear matter fourth-order symmetry energy in the relativistic mean field models
Bao-Jun Cai and Lie-Wen Chen
Within the nonlinear relativistic mean field model, we derive the analytical expression of the nuclear matter fourth-order symmetry energy E(rho). Based on two accurately calibrated interactions FSUGold and IU-FSU, our results show that the value of E(rho) at normal nuclear matter density rho is gen ... [Phys. Rev. C 85, 024302 ] published .
Low energy beam transport for facility for rare isotope beams driver linear particle accelerator
L. T. Sun, D. Leitner, G. Machicoane, E. Pozdeyev, V. Smirnov et al.
The driver linac for the facility for rare isotope beams (FRIB) will provide a wide range of primary ion beams for nuclear physics research. The linac will be capable of accelerating a uranium beam to an energy of up to 200 Mev/u and delivering it to a fragmentation target with a maximum power of 40 ... [Rev. Sci. Instrum. 83, 02B705 (2012)] published Wed Feb 8, 2012.
Electrostatic energy analyzer measurements of low energy zirconium beam parameters in a plasma sputter-type negative ion source
Giovanni M. Malapit, Christian Lorenz S. Mahinay, Matthew D. Poral, and Henry J. Ramos
A plasma sputter-type negative ion source is utilized to produce and detect negative Zr ions with energies between 150 and 450 eV via a retarding potential-type electrostatic energy analyzer. Traditional and modified semi-cylindrical Faraday cups (FC) inside the analyzer are employed to sample negat ... [Rev. Sci. Instrum. 83, 02B704 (2012)] published Wed Feb 8, 2012.
Initial commissioning results with the NSCL Electron Beam Ion Trap
S. Schwarz, G. Bollen, J. R. Crespo Lopez-Urrutia, O. Kester, K. Kittimanapun et al.
The ReA reaccelerator is being added to the National Superconducting Cyclotron Laboratory (NSCL) fragmentation facility in order to provide exotic rare-isotope beams, not available at the Isotope Separation On-Line facilities, in the several-MeV/u energy range. The first stage of the NSCL reaccelera ... [Rev. Sci. Instrum. 83, 02A908 (2012)] published Wed Feb 8, 2012.
Profiles of ion beams and plasma parameters on a multi-frequencies microwaves large bore electron cyclotron resonance ion source with permanent magnets
Yushi Kato, Naoki Sakamoto, Ryutaro Kiriyama, Tomoya Takenaka, Yosuke Kurisu et al.
In order to contribute to various applications of plasma and beams based on an electron cyclotron resonance, a new concept on magnetic field with all magnets on plasma production and confinement has been proposed with enhanced efficiency for broad and dense ion beam. The magnetic field configuration ... [Rev. Sci. Instrum. 83, 02A317 (2012)] published Wed Feb 8, 2012.
Light ion source for proton/deuteron production at CEA Saclay for the Spiral2 project
O. Tuske, G. Adroit, O. Delferriere, J-F. Denis, Y. Gauthier et al.
The production of rare radioactive ion beam (RIB) far from the valley of stability is one of the final purposes of the Spiral2 facility in Caen. The RIB will be produced by impinging a deuteron beam onto a carbon sample to produce a high neutron flux, which will interact with a uranium target. The p ... [Rev. Sci. Instrum. 83, 02A316 (2012)] published Wed Feb 8, 2012.
Development of compact linear accelerator in KBSI
Jang-Hee Yoon, Byoung-Seob Lee, Seyong Choi, Jin Yong Park, Jung-Woo Ok et al.
The compact linear accelerator using a 28 GHz ECRIS is under construction in KBSI, South Korea. The main capability of this facility is the production of fast neurons for the neutron radiography. The designing of a superconducting magnet, microwave transmission system, beam extraction, and plasma ch ... [Rev. Sci. Instrum. 83, 02A315 (2012)] published Wed Feb 8, 2012.
Erratum: Determination of antineutrino spectra from nuclear reactors [Phys. Rev. C 84, 024617 (2011)]
Patrick Huber
Abstract not available. [Phys. Rev. C 85, 029901 ] published .
Near- and sub-barrier fusion of O incident ions with C target nuclei
M. J. Rudolph, Z. Q. Gosser, K. Brown, S. Hudan, R. T. de Souza et al.
Evaporation residues resulting from fusion of O incident ions with C target nuclei have been measured for the first time. The cross-section associated with compound nuclei that de-excite via emission of charged particles is extracted. The resulting excitation function is compared with the prediction ... [Phys. Rev. C 85, 024605 ] published .
Volume and surface symmetry energy coefficients
H. Jiang, G. J. Fu, Y. M. Zhao, and A. Arima
In this paper we study the volume and surface symmetry energy coefficients (c and c) by using the double differences of experimental symmetry energies. We assume a=cc/A and obtain c=31.260.32 MeV and c=52.151.12 MeV, or c=32.100.31 MeV and c=58.911.08 MeV, depending on the form of the Wigner energy. ... [Phys. Rev. C 85, 024301 ] published .
Prospects for advanced electron cyclotron resonance and electron beam ion source charge breeding methods for EURISOL
P. Delahaye, A. Galata, J. Angot, G. Ban, L. Celona et al.
As the most ambitious concept of isotope separation on line (ISOL) facility, EURISOL aims at producing unprecedented intensities of post-accelerated radioactive isotopes. Charge breeding, which transforms the charge state of radioactive beams from 1+ to an n+ charge state prior to post-acceleration, ... [Rev. Sci. Instrum. 83, 02A906 (2012)] published Tue Feb 7, 2012.
Production of rare isotope beams at the Texas A&M University Cyclotron Institute
G. Tabacaru, D. P. May, J. Arje, G. Chubarian, H. Clark et al.
The Cyclotron Institute at Texas A&M is currently configuring a scheme for the production of radioactive-ion beams that incorporates a light-ion guide and a heavy-ion guide coupled with an electron-cyclotron-resonance ion source constructed for charge-breeding. This scheme is part of an upgrade to t ... [Rev. Sci. Instrum. 83, 02A905 (2012)] published Tue Feb 7, 2012.
Status of the plasma generator of the superconducting proton linac
M. Kronberger, D. Faircloth, J. Lettry, M. Paoluzzi, H. Pereira et al.
In the framework of the superconducting proton linac (SPL) study at CERN, a new non-cesiated H plasma generator driven by an external 2 MHz RF antenna has been developed and successfully operated at repetition rates of 50 Hz, pulse lengths of up to 3 ms, and average RF powers of up to 3 kW. The coup ... [Rev. Sci. Instrum. 83, 02A703 (2012)] published Tue Feb 7, 2012.
Molecular and negative ion production by a standard electron cyclotron resonance ion source
R. Racz, S. Biri, Z. Juhasz, B. Sulik, and J. Palinkas
Molecular and negative ion beams, usually produced in special ion sources, play an increasingly important role in fundamental and applied atomic physics. The ATOMKI-ECRIS is a standard ECR ion source, designed to provide highly charged ion (HCI) plasmas and beams. In the present work, H, O, OH, O, C ... [Rev. Sci. Instrum. 83, 02A313 (2012)] published Tue Feb 7, 2012.
Reversible electron beam heating for suppression of microbunching instabilities at free-electron lasers
Christopher Behrens, Zhirong Huang, and Dao Xiang
The presence of microbunching instabilities due to the compression of high-brightness electron beams at existing and future x-ray free-electron lasers (FELs) results in restrictions on the attainable lasing performance and renders beam imaging with optical transition radiation impossible. The instab ... [Phys. Rev. ST Accel. Beams 15, 022802 ] published .
Level structure in the transitional nucleus Au
S. C. Wang, X. H. Zhou, Y. D. Fang, Y. H. Zhang, N. T. Zhang et al.
Excited states in Au have been studied experimentally via the Os(Li, 4n) reaction at a beam energy of 44 MeV. Based on the gamma-gamma-t coincidence measurement, a level scheme consisting of 15 new transitions and 10 new levels is established for Au. The triaxial shape-polarizing effect of the high- ... [Phys. Rev. C 85, 027301 ] published .
Fusion-evaporation residue as a dynamical decay process in the Ca + Bk --> 117 reaction
Kirandeep Sandhu, Manoj K. Sharma, and Raj K. Gupta
The neutron-evaporation residue cross sections sigma, sigma, and sigma in the hot fusion reaction Ca+Bk--> 117 are calculated at the compound-nucleus (CN) excitation energies E=35.3 and 39.3 MeV, by taking the superheavy-region proton magic Z=126 and neutron magic N=184, within the dynamical clus ... [Phys. Rev. C 85, 024604 ] published .
Finite-size effects in isobaric ratios
S. R. Souza and M. B. Tsang
The properties of isobaric ratios, between nuclei produced in the same reaction, are investigated using the canonical and grand-canonical statistical ensembles. Although the grand-canonical formulas furnish a means to correlate the ratios with the liquid drop parameters, finite size effects make it ... [Phys. Rev. C 85, 024603 ] published .
Influence of in-medium NN cross sections, symmetry potential, and impact parameter on isospin observables
Yingxun Zhang (张英逊), D. D. S. Coupland, P. Danielewicz, Zhuxia Li (李祝霞), Hang Liu (刘航) et al.
We explore the influence of the in-medium nucleon-nucleon cross section, symmetry potential, and impact parameter on isospin sensitive observables in intermediate-energy heavy-ion collisions with the ImQMD05 code, a modified version of the quantum molecular dynamics model. At incident velocities abo ... [Phys. Rev. C 85, 024602 ] published .
Resonances in Ne with relevance to the astrophysically important F(p,alpha)O reaction
D. J. Mountford, A. St J. Murphy, N. L. Achouri, C. Angulo, J. R. Brown et al.
The most intense gamma-ray line observable from novae is likely to be from positron annihilation associated with the decay of F. The uncertainty in the destruction rate of this nucleus through the F(p,alpha)O reaction presents a limit to interpretation of any future observed gamma-ray flux. Direct m ... [Phys. Rev. C 85, 022801 ] published .
New variational Monte Carlo method with energy variance extrapolation for large-scale shell-model calculations
Takahiro Mizusaki and Noritaka Shimizu
We propose a new variational Monte Carlo (VMC) method with an energy variance extrapolation for large-scale shell-model calculations. This variational Monte Carlo is a stochastic optimization method with a projected correlated condensed pair state as a trial wave function, and is formulated with the ... [Phys. Rev. C 85, 021301 ] published .