Mon·Aug 1, 2011Monday·August 1, 2011

1. 01*

   Systematic study of projectile structure effect on fusion barrier distribution

   Pratap Roy🇮🇳 · A. Saxena🇮🇳 · B.K. Nayak🇮🇳 · E.T. Mirgule🇮🇳 · B. John🇮🇳 · Y.K. Gupta🇮🇳 · L.S. Danu🇮🇳 · R.P. Vind🇮🇳 · Ashok Kumar🇯🇵 · R.K. Choudhury🇮🇳

   Quasielastic excitation function measurement has been carried out for the ${}^4$He + ${}^{232}$Th system at ${\theta }_{lab}$=160${}^{\circ }$ with respect to the beam direction, to obtain a representation of the fusion barrier distribution. Using the present data along with previously measured barrier distribution results on ${}^{12}$C, ${}^{16}$O, and ${}^{19}$F + ${}^{232}$Th systems a systematic analysis has been carried out to investigate the role of target and/or projectile structures on fusion barrier distribution. It is observed that for ${}^4$He, ${}^{12}$C, and ${}^{16}$O + ${}^{232}$Th, reactions the couplings due to target states only are required in coupled channel fusion calculations to explain the experimental data, whereas for the ${}^{19}$F+ ${}^{232}$Th system along with the coupling of target states, inelastic states of ${}^{19}$F are also required to explain the experimental results on fusion-barrier distribution. The width of the barrier distribution shows interesting transition behavior when plotted with respect to the target-projectile charge product for the above systems.

   nucl-exPRC(2011)·6 citations
2. 02*

   Hyperfine Field and Hyperfine Anomalies of Copper Impurities in Iron

   V. V. Golovko🇧🇪 · F. Wauters🇧🇪 · S. Cottenier🇧🇪 · M. Breitenfeldt🇧🇪 · V. De Leebeeck🇧🇪 · S. Roccia🇧🇪 · G. Soti🇧🇪 · M. Tandecki🇧🇪 · E. Traykov🇧🇪 · S. Van Gorp🇧🇪 · D. Zákoucký🇨🇿 · N. Severijns🇧🇪

   A new value for the hyperfine magnetic field of copper impurities in iron is obtained by combining resonance frequencies from experiments involving {\beta}-NMR on oriented nuclei on 59-Cu, 69-Cu, and 71-Cu with magnetic moment values from collinear laser spectroscopy measurements on these isotopes. The resulting value, i.e., Bhf(CuFe) = -21.794(10) T, is in agreement with the value adopted until now but is an order of magnitude more precise. It is consistent with predictions from ab initio calculations. Comparing the hyperfine field values obtained for the individual isotopes, the hyperfine anomalies in Fe were determined to be 59{\Delta}69=0.15(9)% and 71{\Delta}69=0.07(11)%.

   nucl-exPRC(2011)·7 citations
3. 03*

   A Higgs Quadruplet for Type III Seesaw and Implications for $\mu \to e\gamma$ and $\mu -e$ Conversion

   Bo Ren🇨🇳 · Koji Tsumura🇹🇼 · Xiao-Gang He🇹🇼

   In Type III seesaw model the heavy neutrinos are contained in leptonic triplet representations. The Yukawa couplings of the triplet fermion and the left-handed neutrinos with the doublet Higgs field produce the Dirac mass terms. Together with the Majorana masses for the leptonic triplets, the light neutrinos obtain non-zero seesaw masses. We point out that it is also possible to have a quadruplet Higgs field to produce the Dirac mass terms to facilitate the seesaw mechanism. The vacuum expectation value of the quadruplet Higgs is constrained to be small by electroweak precision data. Therefore the Yukawa couplings of a quadruplet can be much larger than those for a doublet. We also find that unlike the usual Type III seesaw model where at least two copies of leptonic triplets are needed, with both doublet and quadruplet Higgs representations, just one leptonic triplet is possible to have a phenomenologically acceptable model because light neutrino masses can receive sizable contributions at both tree and one loop levels. Large Yukawa couplings of the quadruplet can induce observable effects for lepton flavor violating processes $\mu \to e\gamma$ and $\mu -e$ conversion. Implications of the recent $\mu \to e\gamma$ limit from MEG and also limit on $\mu -e$ conversion on Au are also given. Some interesting collider signatures for the doubly charged Higgs boson in the quadruplet are discussed.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2011)·31 citations
4. 04*

   Neutrino nucleus reactions at high energies within the GiBUU model

   O. Lalakulich🇩🇪 · K. Gallmeister🇩🇪 · T. Leitner🇩🇪 · U. Mosel🇩🇪

   The GiBUU model, which implements all reaction channels relevant at medium neutrino energy, is used to investigate the neutrino and antineutrino scattering on iron. Results for integrated cross sections are compared with NOMAD and MINOS data. It is shown, that final state interaction can noticeably change the spectra of the outgoing hadrons. Predictions for the Miner$\nu$a experiment are made for pion spectra, averaged over NuMI neutrino and antineutrino fluxes.

   ↳ nucl-thhep-exhep-phnucl-exAIP Conf.Proc.(2011)·1 citation
5. 05*

   Pion production in the MiniBooNE

   O. Lalakulich🇩🇪 · K. Gallmeister🇩🇪 · T. Leitner🇩🇪 · U. Mosel🇩🇪

   We investigate one pion production processes within the Giessen Boltzmann--Uehling--Uhlenbeck (GiBUU) coupled channel transport model. Our calculations for integrated and differential cross sections for realistic experimental neutrino fluxes are compared to the data recently provided by the MiniBooNE collaboration.

   ↳ nucl-thhep-exhep-phnucl-exAIP Conf.Proc.(2011)·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.