Wed·Oct 1, 2014Wednesday·October 1, 2014

1. 01*

   Double beta decay searches of Xe-134, Xe-126 and Xe-124 with large scale Xe detectors

   N. Barros🇩🇪 · J. Thurn🇩🇪 · K. Zuber🇩🇪

   The sensitivity for double beta decay studies of Xe-134 and Xe-124 is investigated assuming a potential large scale Xe experiment developed for dark matter searches depleted in Xe-136. The opportunity for an observation of the 2nu double beta decay of Xe-134 is explored for various scenarios. A positive observation should be possible for all calculated nuclear matrix elements. The detection of 2$\nu$ ECEC of Xe-124 can be probed in all scenarios covering the theoretical predicted half-life uncertainties and a potential search for Xe-126 is discussed. The sensitivity to beta+/EC decay of Xe-124 is discussed and a positive observation might be possible, while beta+/beta+ decay still remains unobservable. The performed studies take into account solar pp-neutrino interactions, ${}^{85}$Kr beta decay and remaining Xe-136 double beta decay as background components in the depleted detector.

   nucl-exhep-exhep-phnucl-th+1J.Phys.G(2014)·29 citations
2. 02*

   STAR Highlights on Heavy Ion Physics

   Shusu Shi (the STAR collaboration)🇨🇳

   RHIC-STAR is a mid-rapidity collider experiment for studying high energy nuclear collisions. The main physics goals of STAR experiment are 1) studying the properties of the strongly coupled Quark Gluon Plasma, 2) explore the QCD phase diagram structure. In these proceedings, we will review the recent results of heavy ion physics at STAR.

   nucl-exEPJ Web Conf.(2015)·1 citation
3. 03*

   Measurement of the analysing power in proton-proton elastic scattering at small angles

   Z. Bagdasarian🇬🇪 · D. Chiladze🇬🇪 · S. Dymov🇷🇺 · A. Kacharava🇩🇪 · G. Macharashvili🇬🇪 · S. Barsov🇷🇺 · R. Gebel🇩🇪 · B. Gou🇨🇳 · M. Hartmann🇩🇪 · I. Keshelashvili🇩🇪 · A. Khoukaz🇩🇪 · P. Kulessa🇵🇱 and 27 other authors

   The proton analysing power in $\vec{p}p$ elastic scattering has been measured at small angles at COSY-ANKE at 796 MeV and five other beam energies between 1.6 and 2.4 GeV using a polarised proton beam. The asymmetries obtained by detecting the fast proton in the ANKE forward detector or the slow recoil proton in a silicon tracking telescope are completely consistent. Although the analysing power results agree well with the many published data at 796 MeV, and also with the most recent partial wave solution at this energy, the ANKE data at the higher energies lie well above the predictions of this solution at small angles. An updated phase shift analysis that uses the ANKE results together with the World data leads to a much better description of these new measurements.

   nucl-exPLB(2014)·15 citations
4. 04*

   Neutron interferometric measurement of the scattering length difference between the triplet and singlet states of n-${}^3$He

   M. G. Huber · M. Arif · W. C. Chen · T. R. Gentile🇺🇸 · D. S. Hussey · T. C. Black · D. A. Pushin🇨🇦 · C. B. Shahi · F. E. Wietfeldt🇺🇸 · L. Yang🇺🇸

   We report a determination of the n-${}^3$He scattering length difference $\Delta b^{\prime }=b_1^{\prime }-b_0^{\prime }=$ ($-5.411$ $\pm$ $0.031$ (statistical) $\pm$ $0.039$ (systematic)) fm between the triplet and singlet states using a neutron interferometer. This revises our previous result $\Delta b^{\prime }=$ (-5.610 $\pm$ $0.027$ (statistical) $\pm$ $0.032$ (systematic) fm obtained using the same technique in 2008. This revision is due to a re-analysis of the 2008 experiment that includes a more robust treatment of the phase shift caused by magnetic field gradients near the ${}^3$He cell. Furthermore, we more than doubled our original data set from 2008 by acquiring six months of additional data in 2013. Both the new data set and a re-analysis of the older data are in good agreement. Scattering lengths of low Z isotopes are valued for use in few-body nuclear effective field theories, provide important tests of modern nuclear potential models and in the case of ${}^3$He aid in the interpretation of neutron scattering from quantum liquids. The difference $\Delta b^{\prime }$ was determined by measuring the relative phase shift between two incident neutron polarizations caused by the spin-dependent interaction with a polarized ${}^3$He target. The target ${}^3$He gas was sealed inside a small, flat windowed glass cell that was placed in one beam path of the interferometer. The relaxation of ${}^3$He polarization was monitored continuously with neutron transmission measurements. The neutron polarization and spin flipper efficiency were determined separately using ${}^3$He analyzers and two different polarimetry analysis methods. A summary of the measured scattering lengths for n-${}^3$He with a comparison to nucleon interaction models is given.

   nucl-exPRC(2014)·12 citations
5. 05*

   Effective Spectral Function for Quasielastic Scattering on Nuclei from Deuterium to Lead

   A. Bodek🇺🇸 · M. E. Christy🇺🇸 · B. Coopersmith🇺🇸

   Spectral functions do not fully describe quasielastic electron and neutrino scattering from nuclei because they only model the initial state. Final state interactions distort the shape of the differential cross section at the peak and increase the cross section at the tails of the distribution. We show that the kinematic distributions predicted by the ${\psi }^{\prime }$ superscaling formalism can be well described with a modified {\it {effective spectral function}} (ESF). By construction, models using ESF in combination with the transverse enhancement contribution correctly predict electron QE scattering data. Our values for the binding energy parameter $\Delta$ are smaller than $\overline{ϵ}$ extracted within the Fermi gas model from pre 1971 data by Moniz, probably because these early cross sections were not corrected for coulomb effects.

   ↳ nucl-thhep-exhep-phnucl-exAIP Conf.Proc.(2015)·11 citations
6. 06*

   A recoil detector for the measurement of antiproton-proton elastic scattering at angles close to 90${}^{\circ }$

   Q. Hu🇨🇳 · U. Bechstedt🇩🇪 · A. Gillitzer🇩🇪 · D. Grzonka🇩🇪 · A. Khoukaz🇩🇪 · F. Klehr🇩🇪 · A. Lehrach🇩🇪 · D. Prasuhn🇩🇪 · J. Ritman🇩🇪 · T. Sefzick🇩🇪 · T. Stockmann🇩🇪 · A. Täschner🇩🇪 · P. Wuestner🇩🇪 · H. Xu🇩🇪

   The design and construction of a recoil detector for the measurement of recoil protons of antiproton-proton elastic scattering at scattering angles close to 90${}^{\circ }$ are described. The performance of the recoil detector has been tested in the laboratory with radioactive sources and at COSY with proton beams by measuring proton-proton elastic scattering. The results of laboratory tests and commissioning with beam are presented. Excellent energy resolution and proper working performance of the recoil detector validate the conceptual design of the KOALA experiment at HESR to provide the cross section data needed to achieve a precise luminosity determination at the PANDA experiment.

   ↳ physics.ins-dethep-exnucl-exEPJA(2014)·9 citations
7. 07*

   Strong Orientation Dependence of Multinucleon Transfer Processes in ${}^{238}$U+${}^{124}$Sn Reaction

   Kazuyuki Sekizawa🇯🇵 · Kazuhiro Yabana🇯🇵

   We theoretically investigate multinucleon transfer (MNT) processes in ${}^{238}$U+${}^{124}$Sn reaction at $E_{\mathrm{lab}}=5.7$ MeV/$A$ using the time-dependent Hartree-Fock (TDHF) theory. For this reaction, measurements of MNT processes have been reported, showing substantial MNT cross sections accompanying more than ten protons. From the calculation, we find that the amount of transferred nucleons depends much on the relative orientation between the deformation axis of ${}^{238}$U and the relative vector connecting centers of ${}^{238}$U and ${}^{124}$Sn nuclei. We find a formation of thick neck when the ${}^{238}$U collides from its tip with ${}^{124}$Sn. However, the neck formation is substantially suppressed when ${}^{238}$U collides from its side. We have found that a large number of protons are transferred in the tip collision. This is caused by the breaking of the neck and subsequent absorption of nucleons in the neck region. We thus conclude that the measured MNT processes involving about ten protons originate from the neck breaking dynamics in the tip collisions of a deformed ${}^{238}$U nucleus.

   ↳ nucl-thnucl-exJPS Conf.Proc.(2015)·1 citation

* 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.