Tue·Aug 9, 2016Tuesday·August 9, 2016

1. 01*

   Fission fragment mass distributions in reactions populating 200Pb

   A. Chaudhuri🇮🇳 · A. Sen🇺🇸 · T. K. Ghosh🇮🇳 · K. Banerjee🇮🇳 · Jhilam Sadhukhan🇮🇳 · S. Bhattacharya🇮🇳 · P. Roy🇩🇪 · T. Roy🇮🇳 · C. Bhattacharya🇮🇳 · Md. A. Asgar🇮🇳 · A. Dey · S. Kundu🇮🇳 and 11 other authors

   The fission fragment mass distributions have been measured in the reactions 16O + 184W and 19F+ 181Ta populating the same compound nucleus 200Pb? at similar excitation energies. It is found that the widths of the mass distribution increases monotonically with excitation energy, indicating the absence of quasi-fission for both reactions. This is contrary to two recent claims of the presence of quasi-fission in the above mentioned reactions.

   nucl-exnucl-thPRC(2016)·25 citations
2. 02*

   New limit for the half-life of double beta decay of ${}^{94}$Zr to the first excited state of ${}^{94}$Mo

   N. Dokania🇮🇳 · V. Nanal🇮🇳 · G. Gupta🇮🇳 · S. Pal🇮🇳 · R. G. Pillay🇮🇳 · P. K. Rath🇮🇳 · V.I. Tretyak🇺🇦 · A. Garai🇮🇳 · H. Krishnamoorthy🇮🇳 · C. Ghosh🇮🇳 · P. K. Raina🇮🇳 · K. G. Bhushan🇮🇳

   Neutrinoless Double Beta Decay is a phenomenon of fundamental interest in particle physics. The decay rates of double beta decay transitions to the excited states can provide input for Nuclear Transition Matrix Element calculations for the relevant two neutrino double beta decay process. It can be useful as supplementary information for the calculation of Nuclear Transition Matrix Element for the neutrinoless double beta decay process. In the present work, double beta decay of ${}^{94}$Zr to the $2_1^{+}$ excited state of ${}^{94}$Mo at 871.1 keV is studied using a low background $\sim$ 230 cm${}^3$ HPGe detector. No evidence of this decay was found with a 232 g.y exposure of natural Zirconium. The lower half-life limit obtained for the double beta decay of ${}^{94}\mathrm{Zr}$ to the $2_1^{+}$ excited state of ${}^{94}\mathrm{Mo}$ is $T_{1/2}(0\nu +2\nu )>3.4\times 10^{19}$ y at 90% C.L., an improvement by a factor of $\sim$ 4 over the existing experimental limit at 90\% C.L. The sensitivity is estimated to be $T_{1/2}(0\nu +2\nu )>2.0\times 10^{19}$ y at 90% C.L. using the Feldman-Cousins method.

   nucl-exEPJA(2017)·6 citations
3. 03*

   Exploring contributions from incomplete fusion in ${}^{6,7}$Li+${}^{209}$Bi and ${}^{6,7}$Li+${}^{198}$Pt reactions

   V. V. Parkar🇮🇳 · V. Jha · S. Kailas🇮🇳

   We use the breakup absorption model to simultaneously describe the measured cross-sections of the Complete fusion (CF), Incomplete fusion (ICF), and Total fusion (TF) in nuclear reactions induced by weakly bound nuclei ${}^{6,7}$Li on ${}^{209}$Bi and ${}^{198}$Pt targets. The absorption cross-sections are calculated using the Continuum Discretized Coupled Channels (CDCC) method with different choices of short range imaginary potentials to get the ICF, CF and TF cross-sections. It is observed that the cross-sections for deuteron-ICF/deuteron-capture are of similar magnitude as the $\alpha$-ICF/$\alpha$-capture, in case of ${}^6$Li projectile, while the cross-sections for triton-ICF/triton-capture is more dominant than $\alpha$-ICF/$\alpha$-capture in case of ${}^7$Li projectile. Both these observations are also corroborated by the experimental data. The ratio of ICF to TF cross-sections, which defines the value of fusion suppression factor is found to be in agreement with the data available from the literature. The cross-section ratio of CF/TF and ICF/TF show opposite behavior, the former decreases while the latter increases as the energy is lowered, which shows the dominance of ICF at below barrier energies. We have also studied the correlation of the ICF cross-sections with the non-capture breakup (NCBU) cross-sections as a function of energy, which shows that the NCBU is more significant than ICF at below barrier energies.

   ↳ nucl-thnucl-exPRC(2016)·50 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.