Gamma-ray energies of ⁹⁵Sr and ⁹⁴Sr

Experimental data on ground and excited state properties for all known nuclei with mass number A=95 have been compiled and evaluated. States populated in radioactive decay, as well as in nuclear reactions, have been considered. For these nuclei, level and decay schemes, as well as tables of nuclear properties, are presented. This work supersedes the 1993 evaluation by T. W. Burrows (1993Bu08). In summary, three isomers were identified in ⁹⁵Ag and their respective decay schemes were presented (2003Do09) though only limits on their half lives could be obtained. Besides, high resolution prompt gamma-spectroscopy of ⁹⁵Ag has been reported for the first time (2003Ma24). A comprehensive level scheme ⁹⁵Pd is now available through the ε decay of ⁹⁵Ag (2005Ha45) and the energy of the 21/2+ spin-gap isomer have been established for the first time by observing the gamma-rays from the yrast levels (2003Ma24). The level scheme of ⁹⁵Rh has been extended up to 39/2 h by in-beam spectroscopy (1994Ro08) and the γ-delayed proton decays from ⁹⁶Ag isomers to low-lying levels in ⁹⁵Pd have been observed (2003Ba39). The high spin level scheme of ⁹⁵Ru has been extended up 43/2 h (1994Gh06) and the lifetime or lifetime limits of several high spin states have been reported (2004Ga08). In ⁹⁵Tc, the level scheme has been extended by in-beam spectroscopy (2000Gh01). New data on high spin states in ⁹⁵Mo have been available through in-beam spectroscopy using heavy ion reactions [(1998Kh04),(2004Ch18),(2009Zh11)]. The data on ⁹⁵Nb has been considerably extended by (t,p) reaction (2005Ra30) and by (⁸²Se,p2nγ) reaction (2005Bu08). In ⁹⁵Zr, new measurements on μ (2005St24) and Q (1998Se01) have become available. Controversy on the existence of a 23 keV state in ⁹⁵Zr has been resolved by a high-resolution measurement using magnetic spectrometer (2003So23). New data on high spin states have been published through heavy-ion induced fission [(2002Fo03), (2005Pa48)]. Very recently, new high spin data on ⁹⁵Y by n-induced and spontaneous fission decay have been available (2009Ur02). High spin data on ⁹⁵Sr have been reported by γ-spectroscopy of spontaneous fission decay (2004Hw04). In ⁹⁵Rb, revised estimate of γ-n decay intensity (2002Pf04) and mass excess (2007Ra23) have been reported. New data on ⁸⁵Kr it decay have been reported [(2006Ge05),(2007Si17)] and incorporated.

Experimental data on ground- and excited-state properties for all known nuclei with mass number A = 94 have been compiled and evaluated. States populated in radioactive decay, as well as in nuclear reactions, have been considered. For these nuclei, level and decay schemes, as well as tables of nuclear properties, are given. The Hager-Seltzer internal conversion coefficients are listed for gamma rays of known multipolarity. This work supersedes the 1992 evaluation by J.K. Tuli (1992Tu02). Since 1992, many articles have been published which were incorporated in this evaluation. In summary, high-spin data using large arrays of Ge detectors have been obtained for ⁹⁴Kr (2000Rz02), ⁹⁴Sr (1995Ha20), ⁹⁴Zr (2002Fo03,2005Pa48), ⁹⁴Nb (2000Ma63), ⁹⁴Mo (1998Kh04), ⁹⁴Tc (2000Gh01), ⁹⁴Ru (1994Ju03,1994Ro08), ⁹⁴Rh (1994Ar33), and ⁹⁴Pd (2003Ma24). A new isomer was observed in ⁹⁴Y (1999Ge01). The low-spin levels in ⁹⁸Mo were systematically studied using a variety of experimental techniques (2003Fr02). Considerable effort was spent investigating the decay of ⁹⁴Ag and the levels of ⁹⁴Pd (2006Mu03,2005Mu15,2004BaZY,2004Pl01,2002La18), in particular, the (21+) level in ⁹⁴Ag is the first level observed to undergo both single and double proton radioactivity.

The 1983 evaluation of A = 95 (83Lu03) has been updated using experimental decay and reaction data received by February 3, 1993.

The 1985 evaluation of A=94 (85Mu05) has been revised using experimental decay and reaction data received by November 1, 1990. Many of the data sets presented in 85Mu05 but not given here are available in ENSDF (the data base from which these evaluations are produced). Where there is no new information, the evaluation is mostly that of 85Mu05.

The half-lives of ⁹³Sr, ⁹⁴Sr, ⁹⁵Sr, ¹³⁹Cs, ¹⁴¹Cs and ¹⁴³Ba have been measured with a Ge(Li) detector using sources mass-separated by KUR-ISOL. The results of the measurements are ⁹³Sr, 7.41 ± 0.04 min; ⁹⁴Sr, $\text{75.3 ± 0.2}\text{s}\text{;}{}^{95}\text{Sr}\text{, 23.8 ± 0.3}\text{s}\text{;}{}^{139}\text{Cs}\text{, 9.27 ± 0.16}\text{min}\text{;}{}^{141}\text{Cs}\text{, 24.98 ± 0.13}\text{s}\text{;}{}^{143}\text{Ba, 14.33 ± 0.08}\text{s}$. These results compare favourably with the previously reported values except that for the ⁹⁵Sr half-life.

The 1973 version of Nuclear Data Sheets for A=94 has been revised. Detailed level and decay schemes, arguments for Jπ assignments, and experimental data are presented.