Nuclear Experiment·nucl-ex

Tue·Oct 28, 2014Tuesday·October 28, 2014

10 papers—4 primary·6 cross-listed·reconstructed*

01*
Deuteron Electro-Disintegration at Very High Missing Momenta
W. U. Boeglin · M. K. Jones · K. Aniol · A. Asaturyan · H. Baghdasaryan · F. Benmokhtar · H. Bitao · S. Danagoulian · D. Day · D. Gaskell · D. Higinbotham · G. Huber and 17 other authors
We propose to measure the D(e,e'p) cross section at $Q^{2} = 4.25$ (GeV/c) $^{2}$ and $x_{bj} = 1.35$ for missing momenta ranging from $p_{m} = 0.5$ GeV/c to $p_{m} = 1.0$ GeV/c expanding the range of missing momenta explored in the Hall A experiment (E01-020). At these energy and momentum transfers, calculations based on the eikonal approximation have been shown to be valid and recent experiments indicated that final state interactions are relatively small and possibly independent of missing momenta. This experiment will provide for the first time data in this kinematic regime which are of fundamental importance to the study of short range correlations and high density fluctuations in nuclei. The proposed experiment could serve as a commissioning experiment of the new SHMS together with the HMS in Hall C. A total beam time of 21 days is requested.
nucl-ex10 citations
02*
Strongly interacting matter at RHIC: experimental highlights
V. A. Okorokov (National Research Nuclear University "MEPhI")🇷🇺
Recent experimental results obtained at the Relativistic Heavy-Ion Collider (RHIC) will be discussed. Investigations of different nucleus-nucleus collisions in recent years focus on two main tasks, namely, the detailed study of sQGP properties and the exploration of the QCD phase diagram. Results at top RHIC energy provide important information about event shapes as well as transport and thermodynamic properties of the hot medium for various flavors. Heavy-ion collisions are a unique tool for the study of topological properties of theory. Experimental results obtained for discrete QCD symmetries at finite temperatures are discussed. These results confirm indirectly the topologically non-trivial structure of the QCD vacuum. Most results obtained during phase-I of the RHIC beam energy scan (BES) program show smooth behavior vs initial energy. However, certain results suggest the transition in the domain of dominance of hadronic degrees of freedom at center-of-mass energies between 10-20 GeV. Future developments and more precise studies of features of the QCD phase diagram in the framework of phase-II of RHIC BES will be briefly discussed.
nucl-exProceedings of the XXX International work…·1 citation
03*
Neutron occupancy of the 0d5/2 orbital and the N=16 shell closure in 24O
K. Tshoo🇰🇷 · Y. Satou🇰🇷 · C.A. Bertulani🇺🇸 · H. Bhang🇰🇷 · S. Choi🇰🇷 · T. Nakamura🇯🇵 · Y. Kondo🇯🇵 · S. Deguchi🇯🇵 · Y. Kawada🇯🇵 · Y. Nakayama🇯🇵 · K.N. Tanaka🇯🇵 · N. Tanaka🇯🇵 and 25 other authors
One-neutron knockout from 24O leading to the first excited state in 23O has been measured for a proton target at a beam energy of 62 MeV/nucleon. The decay energy spectrum of the neutron unbound state of 23O was reconstructed from the measured four momenta of the 22O fragment and emitted neutron. A sharp peak was found at Edecay=50 $\pm$ 3 keV, corresponding to an excited state in 23O at 2.78 $\pm$ 0.11 MeV, as observed in previous measurements. The longitudinal momentum distribution for this state was consistent with d -wave neutron knockout, providing support for a J{\pi} assignment of 5/2+. The associated spectroscopic factor was deduced to be C2S(0d5/2)=4.1 $\pm$ 0.4 by comparing the measured cross section (View the MathML source) with a distorted wave impulse approximation calculation. Such a large occupancy for the neutron 0d5/2 orbital is in line with the N=16 shell closure in 24O.
nucl-exPLB(2014)·12 citations
04*
Experimental and Simulation of Gamma Radiation Dose Rate for High Exposure Building Material
Akbar Abbasi🇹🇷 · Mustfa Hassanzadeh
Natural radioactivity concentrations in high exposure building materials are commonly used in Iran, which is measured a direct exposure by using {\gamma}-ray spectrometry. The values for 226Ra, 232Th and 40K were in the ranges 3.8 - 94.2, 6.5 - 172.2 and 556.9 - 1539.2 Bqkg-1, respectively. The absorbed dose rates in the standard dwelling room due to 238U, 232Th series and 40K were calculated with MCNPX code. The simulation and experimental results were between 7.95 - 41.74 and 8.36 - 39.99 nGy h-1, respectively. These results were compared with experimental outing and there was overlap closely. The simulation results are able to develop for any kind of dwelling places.
nucl-exphysics.ins-det0 citations
05*
Aboveground test of an advanced Li $_{2}$ MoO $_{4}$ scintillating bolometer to search for neutrinoless double beta decay of $^{100}$ Mo
T.B. Bekker🇷🇺 · N. Coron🇫🇷 · F.A. Danevich🇺🇦 · V.Ya. Degoda🇺🇦 · A. Giuliani🇫🇷 · V.D. Grigorieva🇷🇺 · N.V. Ivannikova🇷🇺 · M. Mancuso🇫🇷 · P. de Marcillac🇫🇷 · I.M. Moroz🇺🇦 · C. Nones🇫🇷 · E. Olivieri🇫🇷 and 5 other authors
Large lithium molybdate (Li $_{2}$ MoO $_{4}$ ) crystal boules were produced by using the low thermal gradient Czochralski growth technique from deeply purified molybdenum. A small sample from one of the boules was preliminary characterized in terms of X-ray-induced and thermally-excited luminescence. A large cylindrical crystalline element (with a size of $⊘ 40 \times 40$ mm) was used to fabricate a scintillating bolometer, which was operated aboveground at $\sim 15$ mK by using a pulse-tube cryostat housing a high-power dilution refrigerator. The excellent detector performance in terms of energy resolution and $α$ background suppression along with preliminary positive indications on the radiopurity of this material show the potentiality of Li $_{2}$ MoO $_{4}$ scintillating bolometers for low-counting experiment to search for neutrinoless double beta decay of $^{100}$ Mo.
↳ physics.ins-detnucl-exAstropart.Phys.(2016)·80 citations
06*
On the extraction of the intrinsic light-quark sea in the proton
Wen-Chen Chang🇹🇼 · Jen-Chieh Peng🇺🇸
The HERMES collaboration recently reported a reevaluation of the strange-quark parton distribution, $S (x)$ , based on kaon production in semi-inclusive deep-inelastic scattering. Two distinct results on $S (x)$ at the $x > 0.1$ region, one with a sizable magnitude and another with a vanishing content, were reported. We show that the latter result is due to a particular assumption adopted in the analysis. The impact of the new HERMES $S (x)$ result on the extraction of intrinsic light-quark sea in the proton is discussed. Given the large uncertainty in the kaon fragmentation function, we find that the latest HERMES data do not exclude the existence of a significant intrinsic strange-quark sea in the proton. The $x$ dependence of the $(s + s ˉ) / (u ˉ + d ˉ)$ ratio is also in qualitative agreement with the presence of intrinsic strange-quark sea.
↳ hep-phnucl-exnucl-thPRD(2015)·15 citations
07*
Multi-strange baryon production in pp, p-Pb and Pb-Pb collisions measured with ALICE
Domenico Colella (for the ALICE Collaboration)🇮🇹
The production of {\Xi} $^{-}$ and {\Omega} $^{-}$ baryons and their anti-particles in pp, p-Pb and Pb-Pb collisions has been measured by the ALICE Collaboration. These hyperons are reconstructed via the detection of their charged weak-decay products, which are identified through their measured ionisation losses and momenta in the ALICE Time Projection Chamber. Comparing the production yields in Pb-Pb and pp collisions, a strangeness enhancement has been measured and found to increase with the centrality of the collision and with the strangeness content of the baryon; moreover, in the comparison with similar measurements at lower energies, it decreases as the centre-of-mass energy increases, following the trend already observed moving from SPS to RHIC. Recent measurement of cascade and {\Omega} in p-Pb interactions are compared with results in Pb-Pb and pp collisions and with predictions from thermal models, based on a grand canonical approach. The nuclear modification factors for the charged {\Xi} and {\Omega}, compared to the ones for the lighter particles, are also presented.
↳ hep-exnucl-exEPJ Web Conf.(2014)·1 citation
08*
Subbarrier fusion of carbon isotopes: from resonance structure to fusion oscillations
K. Hagino🇯🇵 · N. Rowley🇫🇷
At energies below the Coulomb barrier, the fusion excitation function for the $^{12}$ C+ $^{12}$ C system shows prominent fine structures, whereas that for the $^{12}$ C+ $^{13}$ C system behaves more smoothly as a function of energy. We demonstrate that these different behaviors can be simultaneously reproduced using an optical potential in which the strength of the imaginary part is proportional to the level density of each compound nucleus. We also discuss the oscillatory behavior of fusion excitation function for these systems observed at energies above the Coulomb barrier from a view point of quantum mechanical systems with identical particles.
↳ nucl-thnucl-exJ.Phys.Conf.Ser.(2015)·3 citations
09*
Neutron stars with Hyperons in Dirac-Brueckner-Hartree-Fock approach
Tetsuya Katayama🇯🇵 · Koichi Saito🇯🇵
Using the Dirac-Brueckner-Hartree-Fock (DBHF) approach including the hyperon degrees of freedom, we investigate the properties of neutron-star matter. To handle the hyperons in matter, we first examine the importance of the space part of baryon self-energies at high densities, and secondly study the effect of negative-energy states of baryons, which can provide an unambiguous relationship between the in-medium reaction matrices for baryon-baryon scattering and the baryon self-energies. We solve the coupled, Bethe-Salpeter equations in the nuclear-matter rest frame by using the Bonn potentials. We assume that eight kinds of nonstrange and strange mesons ( $σ, δ, ω, ρ, η, π, K, K^{*}$ ) take part in the interactions between two baryons. Then, we calculate the baryon self-energies, the energy density and pressure of matter. The present calculation provides a hard equation of state in neutron-star matter at high densities, which is generated by the effect of Pauli exclusion, the short-range correlations between two baryons, etc. We finally predict the maximum neutron-star mass of $2.02 M_{⊙}$ , which is consistent with both the recently observed masses, $1.97 \pm 0.04 M_{⊙}$ (J1614-2230) and $2.01 \pm 0.04 M_{⊙}$ (J0348+0432).
↳ nucl-thastro-ph.SRhep-phnucl-ex27 citations
10*
Characterising encapsulated nuclear waste using cosmic-ray muon tomography
Anthony Clarkson🇿🇦 · David J. Hamilton🇬🇧 · Matthias Hoek🇩🇪 · David G. Ireland🇬🇧 · John R. Johnstone🇬🇧 · Ralf Kaiser🇬🇧 · Tibor Keri🇩🇪 · Scott Lumsden🇬🇧 · David F. Mahon🇬🇧 · Bryan McKinnon🇬🇧 · Morgan Murray🇬🇧 · Siân Nutbeam-Tuffs🇬🇧 and 3 other authors
Tomographic imaging techniques using the Coulomb scattering of cosmic-ray muons have been shown previously to successfully identify and characterise low- and high-Z materials within an air matrix using a prototype scintillating-fibre tracker system. Those studies were performed as the first in a series to assess the feasibility of this technology and image reconstruction techniques in characterising the potential high-Z contents of legacy nuclear waste containers for the UK Nuclear Industry. The present work continues the feasibility study and presents the first images reconstructed from experimental data collected using this small-scale prototype system of low- and high-Z materials encapsulated within a concrete-filled stainless-steel container. Clear discrimination is observed between the thick steel casing, the concrete matrix and the sample materials assayed. These reconstructed objects are presented and discussed in detail alongside the implications for future industrial scenarios.
↳ physics.ins-detnucl-exJINST(2015)·16 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.