Gamma-ray energies of Se-85 and Se-86

The experimental nuclear spectroscopic data for known nuclides of mass number 86 (Ga, Ge, As, Se, Br, Kr, Rb, Sr, Y, Zr, Nb, Mo, Tc) have been evaluated and presented together with Adopted properties for levels and γ rays. New high-spin data are available for ⁸⁶Se, ⁸⁶Br, ⁸⁶Kr, ⁸⁶Sr, ⁸⁶Y, ⁸⁶Zr and ⁸⁶Mo; and lifetime data for high-spin states in ⁸⁶Y and ⁸⁶Zr. No significant new data since the 2001 NDS for A=86 have been reported for ⁸⁶Rb and ⁸⁶Nb. No data are yet available for excited states in ⁸⁶Ga and ⁸⁶As. The decay scheme of radioactive ⁸⁶Ge is unknown, while those for ⁸⁶Ga, ⁸⁶As, 47.4 min isomer of ⁸⁶Y, ⁸⁶Nb and ⁸⁶Tc are deemed as incomplete. Isomerism in ⁸⁶Nb remains unconfirmed. This work supersedes the data presented in the previous NDS evaluation of A=86 published by 2001Si43.

Evaluated experimental data are presented for 13 known nuclides of mass 85 (Zn, Ga, Ge, As, Se, Br, Kr, Rb, Sr, Y, Zr, Nb, Mo). Since the previous 1990 evaluation of $\mathrm{A}=85$, ⁸⁵Zn, ⁸⁵Ga, ⁸⁵Ge and ⁸⁵nuclides are newly added here. Excited state data for ⁸⁵Se, ⁸⁵Zr have become available from radioactive decay and in–beam γ–ray studies. New and improved high–spin data are available for ⁸⁵Br, ⁸⁵Kr, ⁸⁵Rb, ⁸⁵Y, ⁸⁵Nb and ⁸⁵Mo. New direct and precise measurement of atomic masses of ⁸⁵Ge, ⁸⁵As, ⁸⁵Se, ⁸⁵Br, ⁸⁵Rb, ⁸⁵Zr, ⁸⁵Nb and ⁸⁵Mo have greatly improved the landscape of β decay–Q values and separation energies in this mass region.

In spite of extensive experimental work on the isobaric nuclei of this mass chain several deficiencies remain. No excited states are known in ⁸⁵Zn, ⁸⁵Ga, ⁸⁵As. Only a few excited state are assigned in ⁸⁵Ge from ⁸⁵Ga β– decay. From radioactivity studies, the decay schemes of ⁸⁵Zn and ⁸⁵Mo are not known, and those for ⁸⁵Ga, ⁸⁵Ge, ⁸⁵As and 10.9–s isomer of ⁸⁵Zr are incomplete. Level lifetimes are not known for excited states in ⁸⁵Se, ⁸⁵Br, ⁸⁵Nb and ⁸⁵Mo. The ⁸⁵Tc nuclide has not been detected in fragmentation experiments at GANIL, alluding to its unbound nature for proton emission. The ⁸⁵Kr, ⁸⁵Rb, ⁸⁵Sr, and ⁸⁵Y nuclides remain the most extensively studied from many different reactions and decays.

The evaluation of $\mathrm{A}=85$ nuclides has been done after a span of 23 years, thus includes an extensive amount of new data for almost each nuclide. This work supersedes the data for $\mathrm{A}=85$ nuclides presented in earlier full NDS publication by J. Tepel in 1980Te04 and a later one published in an update mode by H. Sievers in 1991Si01

Currently, thirty-two zinc, thirty-two selenium, twenty-nine bromine, and thirty-one neodymium isotopes have been observed and the discovery of these isotopes is described here. For each isotope a brief synopsis of the first refereed publication, including the production and identification method, is presented.

Nuclear spectroscopic information for known nuclides of mass number 86 (Ga, Ge, As, Se, Br, Kr, Rb, Sr, Y, Zr, Nb, Mo, Tc) has been evaluated and presented together with adopted energies, Jπ, and decay modes of levels in these nuclei. No data are yet available for excited states in ⁸⁶Ga, ⁸⁶Ge and ⁸⁶As. This evaluation supersedes earlier Nuclear Data Sheets for A=86 (1997Ki04, 1988Mu14, 1978Te01, 1971Au13).

The 1988 evaluation of A=86 (88Mu14) has been revised using experimental decay and reaction data received by the cutoff date noted below.

The 1980 version of Nuclear Data Sheets for A=85 has been revised. Detailed level and decay schemes, arguments for Jπ assignments, and experimental data are presented. New results were obtained, especially on high spin states, while the data for ⁸⁵Rb were improved by precision measurements on ⁸⁵Kr β⁻ and ⁸⁵Sr ɛ decay.