Tue·Mar 22, 2016Tuesday·March 22, 2016

1. 01*

   Characteristics study of projectiles lightest fragment for 84Kr36 - emulsion interaction at around 1 A GeV

   N. Marimuthu🇮🇳 · V. Singh · S. S. R. Inbanathan🇮🇳

   The present article significantly investigated projectiles lightest fragments (proton) multiplicity distribution and probability distribution with 84Kr36 emulsion collision at around 1 A GeV. The multiplicity and normalized multiplicity of projectiles lightest fragments (proton) is correlated with the compound particles, shower particles, black particles, grey particles, helium fragments particles and heavily ionizing charged particles. It is found that projectiles lightest fragments (proton) are strongly correlated with compound particles and shower particles rather than other particles and the average multiplicity of projectiles lightest fragments (proton) increases with increasing compound, shower and heavy ionizing particles. Normalized projectiles lightest fragments (proton) are strongly correlated with compound particles, shower particles and heavy ionizing charge particles. The multiplicity distribution of the projectiles lightest fragments (proton) emitted in the 84Kr36 + emulsion interaction at around 1 A GeV with different target has well explained by KNO scaling. The mean multiplicity of projectiles lightest fragments (proton) depends on the mass number of the projectile and does not significantly dependent of the projectile energy. The mean multiplicity projectiles lightest fragment (proton) increases with increasing the target mass number.

   nucl-exIndian J.Phys.(2017)·8 citations
2. 02*

   Search for $2\beta$ decay of ${}^{106}$Cd with enriched ${}^{106}$CdWO${}_4$ crystal scintillator in coincidence with four HPGe detectors

   P. Belli (1)🇮🇹 · R. Bernabei (1,2)🇮🇹 · V.B. Brudanin (3)🇷🇺 · F. Cappella (4)🇮🇹 · V. Caracciolo (4)🇮🇹 · R. Cerulli (4)🇮🇹 · D.M. Chernyak (5)🇺🇦 · F.A. Danevich (5)🇺🇦 · S. d'Angelo (1,2)🇮🇹 · A. Di Marco (1,2)🇮🇹 · A. Incicchitti (6,7)🇮🇹 · M. Laubenstein (4)🇮🇹 and 5 other authors

   A radiopure cadmium tungstate crystal scintillator, enriched in ${}^{106}$Cd to 66%, with mass of 216 g (${}^{106}$CdWO${}_4$), was used to search for double beta decay processes in ${}^{106}$Cd in coincidence with four ultra-low background high purity germanium detectors in a single cryostat. New improved limits on the double beta processes in ${}^{106}$Cd have been set on the level of $10^{20}-10^{21}$ yr after 13085 h of data taking. In particular, the half-life limit on the two neutrino electron capture with positron emission, $T_{1/2}^{2\nu \epsilon {\beta }^{+}}\ge 1.1\times 10^{21}$ yr, has reached the region of theoretical predictions. With this half-life limit the effective nuclear matrix element for the $2\nu \epsilon {\beta }^{+}$ decay is bounded as $M_{eff}^{2\nu \epsilon {\beta }^{+}}\le 1.1$. The resonant neutrinoless double electron captures to the 2718 keV, 2741 keV and 2748 keV excited states of ${}^{106}$Pd are restricted at the level of $T_{1/2}\ge (8.5\times 10^{20}-1.4\times 10^{21}$) yr.

   nucl-exhep-exPRC(2016)·45 citations
3. 03*

   Direct mass measurements of neutron-rich ${}^{86}$Kr projectile fragments and the persistence of neutron magic number $N$ = 32 in Sc isotopes

   Xing Xu🇨🇳 · Meng Wang🇨🇳 · Yu-hu Zhang🇨🇳 · Hu-shan Xu🇨🇳 · Peng Shuai🇨🇳 · Xiao-lin Tu🇨🇳 · Yuri A. Litvinov🇨🇳 · Xiao-hong Zhou🇨🇳 · Bao-hua Sun🇨🇳 · You-jin Yuan🇨🇳 · Jia-wen Xia🇨🇳 · Jian-cheng Yang🇨🇳 and 22 other authors

   In this paper, we present direct mass measurements of neutron-rich ${}^{86}$Kr projectile fragments conducted at the HIRFL-CSR facility in Lanzhou by employing the Isochronous Mass Spectrometry (IMS) method. The new mass excesses of ${}^{52-54}$Sc nuclides are determined to be -40492(82), -38928(114), -34654(540) keV, which show a significant increase of binding energy compared to the reported ones in the Atomic Mass Evaluation 2012 (AME12). In particular, ${}^{53}$Sc and ${}^{54}$Sc are more bound by 0.8 MeV and 1.0 MeV, respectively. The behavior of the two neutron separation energy with neutron numbers indicates a strong sub-shell closure at neutron number $N$ = 32 in Sc isotopes.

   nucl-exCPC(2015)·35 citations
4. 04*

   Photoproduction of $\Lambda$ and ${\Sigma }^0$ hyperons using linearly polarized photons

   CLAS Collaboration: C.A. Paterson · D.G. Ireland · K. Livingston · B. McKinnon

   Background: Measurements of polarization observables for the reactions $\vec{\gamma }p\to K^{+}\Lambda$ and $\vec{\gamma }p\to K^{+}{\Sigma }^0$ have been performed. This is part of a programme of measurements designed to study the spectrum of baryon resonances. Purpose: The accurate measurement of several polarization observables provides tight constraints for phenomenological fits. Beam-recoil observables for the $\vec{\gamma }p\to K^{+}{\Sigma }^0$ reaction have not been reported before now. Method: The measurements were carried out using linearly polarized photon beams and the CLAS detector at the Thomas Jefferson National Accelerator Facility. The energy range of the results is 1.71\,GeV $<W<$ 2.19\,GeV, with an angular range $-0.75<\cos {\theta }_K^{\star }<+0.85$. Results: The observables extracted for both reactions are beam asymmetry $\Sigma$, target asymmetry $T$, and the beam-recoil double polarization observables $O_x$ and $O_z$. Conclusions: Comparison with theoretical fits indicates that in the regions where no previous data existed, the new data contain significant new information, and strengthen the evidence for the set of resonances used in the latest Bonn-Gatchina fit.

   nucl-exPRC(2016)·80 citations
5. 05*

   Diffractive dijet photoproduction in ultraperipheral collisions at the LHC in next-to-leading order QCD

   V. Guzey (PNPI, Gatchina)🇷🇺 · M. Klasen (Muenster U.)🇩🇪

   We make predictions for the cross sections of diffractive dijet photoproduction in $pp$, $pA$ and $AA$ ultraperipheral collisions (UPCs) at the LHC during Runs 1 and 2 using next-to-leading perturbative QCD. We find that the resulting cross sections are sufficiently large and, compared to lepton-proton scattering at HERA, have an enhanced sensitivity to small observed momentum fractions in the diffractive exchange, commonly denoted $z_P^{\mathrm{jets}}$, and an unprecedented reach in the invariant mass of the photon-nucleon system $W$. We examine two competing schemes of diffractive QCD factorization breaking, which assume either a global suppression factor or a suppression for resolved photons only and demonstrate that the two scenarios can be distinguished by the nuclear dependence of the distributions in the observed parton momentum fraction in the photon $x_{\gamma }^{\mathrm{jets}}$.

   ↳ hep-phhep-exnucl-exJHEP(2016)·55 citations
6. 06*

   Vorticity in Heavy-Ion Collisions

   Wei-Tian Deng🇨🇳 · Xu-Guang Huang🇨🇳

   We study the event-by-event generation of flow vorticity in RHIC Au + Au collisions and LHC Pb + Pb collisions by using the HIJING model. Different definitions of the vorticity field and velocity field are considered. A variety of properties of the vorticity are explored, including the impact parameter dependence, the collision energy dependence, the spatial distribution, the event-by-event fluctuation of the magnitude and azimuthal direction, and the time evolution. In addition, the spatial distribution of the flow helicity is also studied.

   ↳ nucl-thhep-lathep-phnucl-exPRC(2016)·241 citations
7. 07*

   Foundations of Strangeness Nuclear Physics derived from chiral Effective Field Theory

   Ulf-G. Meißner🇩🇪 · Johann Haidenbauer🇩🇪

   Dense compact objects like neutron stars or black holes have always been one of Gerry Brown's favorite research topics. This is closely related to the effects of strangeness in nuclear physics. Here, we review the chiral Effective Field Theory approach to interactions involving nucleons and hyperons, the possible existence of strange dibaryons, the fate of hyperons in nuclear matter and the present status of three-body forces involving hyperons and nucleons.

   ↳ nucl-thhep-lathep-phnucl-exIJMPE(2017)·5 citations
8. 08*

   soLenoid and time projectioN chAmber for neutron lifetime measurement -- LINA

   Hidetoshi Otono🇯🇵

   Among measurements of the neutron lifetime, there is a 1% difference between proton-counting methods and neutron-counting methods. In this paper, a new electron-counting method with a magnetic field aiming for a 0.1% accuracy is proposed, which would have a possibility to probe the discrepancy.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2017)·10 citations
9. 09*

   A data analysis method for isochronous mass spectrometry using two time-of-flight detectors at CSRe

   Xing Xu🇨🇳 · Meng Wang · Peng Shuai🇨🇳 · Rui-Jiu Chen🇨🇳 · Xin-Liang Yan🇨🇳 · Yu-Hu Zhang🇨🇳 · You-Jin Yuan🇨🇳 · Hu-Shan Xu🇨🇳 · Xiao-Hong Zhou🇨🇳 · Yuri A. Litvinov🇨🇳 · Sergey Litvinov🇩🇪 · Xiao-Lin Tu🇨🇳 and 10 other authors

   The concept of isochronous mass spectrometry (IMS) applying two time-of-flight (TOF) detectors originated many years ago at GSI. However, the corresponding method for data analysis has never been discussed in detail. Recently, two TOF detectors have been installed at CSRe and the new working mode of the ring is under test. In this paper, a data analysis method for this mode is introduced and tested with a series of simulations. The results show that the new IMS method can significantly improve mass resolving power via the additional velocity information of stored ions. This improvement is especially important for nuclides with Lorentz factor $\gamma$-value far away from the transition point ${\gamma }_t$ of the storage ring CSRe.

   ↳ physics.ins-detnucl-exphysics.acc-phCPC(2015)·12 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.