Fri·Jan 16, 2015Friday·January 16, 2015

1. 01*

   High-spin level structure of the neutron-rich nucleus 91Y

   Xiao-Feng He · Xiao-Hong Zhou🇨🇳 · Yong-De Fang🇨🇳 · Min-Liang Liu🇨🇳 · Yu-Hu Zhang🇨🇳 · Kai-Long Wang🇨🇳 · Jian-Guo Wang🇨🇳 · Song Guo🇫🇷 · Yun-Hua Qiang · Yong Zheng🇨🇳 · Ning-Tao Zhang · Guang-Shun Li and 4 other authors

   High-spin level structure of the neutron-rich nucleus 91Y has been reinvestigated via the 82Se(13C, p3n)91Y reaction. A newly constructed level scheme including several key levels clarifies the uncertainties in the earlier studies. These levels are characterized by the breaking of the Z=38 and N=56 subshell closures, which involves in the spin-isospin dependent central force and tensor force.

   nucl-exNucl.Phys.Rev.(2015)·0 citations
2. 02*

   A Monte Carlo Study of Multiplicity Fluctuations in Pb-Pb Collisions at LHC Energies

   Ramni Gupta🇮🇳

   With large volumes of data available from LHC, it has become possible to study the multiplicity distributions for the various possible behaviours of the multiparticle production in collisions of relativistic heavy ion collisions, where a system of dense and hot partons has been created. In this context it is important and interesting as well to check how well the Monte Carlo generators can describe the properties or the behaviour of multiparticle production processes. One such possible behaviour is the self-similarity in the particle production, which can be studied with the intermittency studies and further with chaoticity/erraticity, in the heavy ion collisions. We analyse the behaviour of erraticity index in central Pb-Pb collisions at centre of mass energy of 2.76 TeV per nucleon using the AMPT monte carlo event generator, following the recent proposal by R.C. Hwa and C.B. Yang, concerning the local multiplicity fluctuation study as a signature of critical hadronization in heavy-ion collisions. We report the values of erraticity index for the two versions of the model with default settings and their dependence on the size of the phase space region. Results presented here may serve as a reference sample for the experimental data from heavy ion collisions at these energies.

   nucl-ex2 citations
3. 03*

   Coulomb breakup of ${}^{37}$Mg and its ground state structure

   Neelam Shubhchintak · R. Chatterjee · R. Shyam · K. Tsushima

   We calculate Coulomb breakup of the neutron rich nucleus ${}^{37}$Mg on a Pb target at the beam energy of 244 MeV/nucleon within the framework of a finite range distorted wave Born approximation theory that is extended to include the effects of projectile deformation. In this theory, the breakup amplitude involves the full wave function of the projectile ground state. Calculations have been carried out for the total one-neutron removal cross section $({\sigma }_{-1n})$, the neutron-core relative energy spectrum, the parallel momentum distribution of the core fragment, the valence neutron angular, and energy-angular distributions. The calculated ${\sigma }_{-1n}$ has been compared with the recently measured data to put constraints on the spin parity, and the one-neutron separation energy ($S_n$) of the ${}^{37}$Mg ground state (${}^{37}$Mg${}_{gs}$). The dependence of ${\sigma }_{-1n}$ on the deformation of this state has also been investigated. While a spin parity assignment of $7/2^{-}$ for the ${}^{37}$Mg${}_{gs}$ is ruled out by our study, neither of the $3/2^{-}$ and $1/2^{+}$ assignments can be clearly excluded. Using the spectroscopic factor of one for both the $3/2^{-}$ and $1/2^{+}$ configurations and ignoring the projectile deformation effects, the $S_n$ values of $0.35\pm 0.06$ MeV and $0.50\pm 0.07$ MeV, respectively, are extracted for the two configurations. However, the extracted $S_n$ is strongly dependent on the spectroscopic factor and the deformation effects of the respective configuration. The narrow parallel momentum distribution of the core fragment and the strong forward peaking of the valence neutron angular distribution suggest a one-neutron halo configuration in either of the $2p_{3/2}$ and $2s_{1/2}$ configurations of the ${}^{37}$Mg ground state.

   ↳ nucl-thnucl-exNPA(2015)·21 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.