Mon·Feb 2, 2015Monday·February 2, 2015

1. 01*

   High Spin Spectroscopy and Shape Evolution in 105Cd

   M. Kumar Raju🇮🇳 · D. Negi🇮🇳 · S. Muralithar · R. P. Singh🇮🇳 · J. A. Sheikh · G. H. Bhat🇮🇳 · R. Kumar · Indu Bala · T. Trivedi🇮🇳 · A. Dhal🇮🇱 · K. Rani · R. Gurjar and 7 other authors

   High spin states in 105Cd were studied using 16O beam on 92Mo reaction at an incident beam energy of 75 MeV. The level scheme of 105Cd has been observed up to an excitation energy of 10.8 MeV with the addition of 30 new gamma transitions to the previous work. Spin and parity for most of the reported levels are assigned from the DCO ratios and linear polarization measurements. The microscopic origin of the investigated band structures is discussed in the context of triaxial projected shell model. The energies of observed positive and negative parity bands agree with the predictions of the TPSM by considering triaxial deformation for the observed excited band structures. The shape evolution with increasing angular momentum is explained in the framework of Cranked Shell Model and the Total Routhian Surface calculations.

   nucl-exnucl-thPRC(2015)·6 citations
2. 02*

   Precise measurement of the 222Rn half-life: a probe to monitor the stability of radioactivity

   E. Bellotti🇮🇹 · C. Broggini🇮🇹 · G. Di Carlo🇮🇹 · M. Laubenstein🇮🇹 · R. Menegazzo🇮🇹

   We give the results of a study on the 222Rn decay we performed in the Gran Sasso Laboratory (LNGS) by detecting the gamma rays from the radon progeny. The motivation was to monitor the stability of radioactivity measuring several times per year the half-life of a short lifetime (days) source instead of measuring over a long period the activity of a long lifetime (tens or hundreds of years) source. In particular, we give a possible reason of the large periodical fluctuations in the count rate of the gamma rays due to radon inside a closed canister which has been described in literature and which has been attributed to a possible influence of a component in the solar irradiation affecting the nuclear decay rates. We then provide the result of four half-life measurements we performed underground at LNGS in the period from May 2014 to January 2015 with radon diffused into olive oil. Briefly, we did not measure any change of the 222Rn half-life with a 8*10^-5 precision. Finally, we provide the most precise value for the 222Rn half-life: 3.82146(16){stat}(4){syst} days.

   nucl-exastro-ph.SRphysics.ins-detPLB(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.