On the structure of71As and 73As
Abstract
The structure of the nuclei 71As and 73As has been investigated by studying the decay of 71Se, 73gSe and 73mSe, the 72Ge(p, 2nγ)71As reaction, the 73Ge(p, nγ)73As reaction and the 72Ge(3He, d) 73As reaction. Level schemes of 71As and 73As are constructed on basis of the energies and intensities of the gamma transitions and their coincidence relations. Spins and parities are deduced from log ft values, l-values and the decay properties of the excited states. The measured half-life of the lowest excited state in 71As is . The experimental level-schemes are compared with the predictions of the cluster-vibrational coupling model.
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Nuclear Structure and Decay Data for A=71 Isobars
2023, Nuclear Data SheetsExperimental nuclear spectroscopic data are evaluated for 12 known nuclides of mass number=71 (Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Br, Kr). Detailed compiled and evaluated information is presented for each reaction and decay experiment. The β−n decay of 72Co to 71Ni is included in this work, while for β−n decay of 71Co to 70Ni, consult Nuclear Data Sheets for A=70 (2016Gu11) or the ENSDF database for 70Ni. Combining all the available data, recommended values are provided for energies, spins and parities, and half-lives of levels, with energies, branching ratios and multipolarities of γ radiations, and characteristics of β and α radiations in radioactive decays. Excited-states have not yet been identified in 71Mn, 71Fe, and 71Kr, with the ground-state half-life remaining unknown only for 71Mn; data for excited states in 71Co and 71Ni are very limited; 71Ga, 71Ge and 71As are the most extensively studied nuclides via various reactions and decays, followed by 71Cu, 71Zn, 71Se, and 71Br, however, except for 71Ge, the decay schemes of all other nuclides are considered as incomplete due to a large gap between the decay Q-value and the highest observed level. This work supersedes earlier evaluations of A=71 by 2011Ab01.
Nuclear data sheets for A = 85
2014, Nuclear Data SheetsEvaluated 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 , 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 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 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
Nuclear Data Sheets for A = 71
2011, Nuclear Data SheetsThe evaluated spectroscopic data are presented for experimentally known nuclides of mass 71 (Mn,Fe,Co,Ni,Cu,Zn,Ga,Ge,As,Se,Br,Kr). Excited-state data are nonexistent for 71Mn, 71Fe, 71Co and 71Kr. Significant new data have been added since the last evaluation of A=71 nuclides by M. Bhat (1993Bh02). Excited states are now known in 71Ni and 71Cu, and enhanced information about high-spin excitations is available for 71Ga, 71As and 71Br. The decay schemes of radioactive isotopes 71Mn and 71Fe are not known at all, and those for 71Co, 71mNi and 71Kr are not known well. For the decay of 71Cu, 71gNi, and 71Br, extensive data are available, but in the opinion of the evaluators the decay schemes still seem incomplete.
This work supersedes earlier full evaluations of A=71 published by 1988Bh01, 1979Ke06 and 1973Al33, and the last one published in ‘update’ mode by 1993Bh02.
Nuclear data sheets for A = 73
2004, Nuclear Data SheetsNuclear spectroscopic information for known nuclides of mass number 73 (Co,Ni,Cu,Zn,Ga,Ge,As,Se,Br,Kr, Rb,Sr)has been evaluated and presented together with adopted energies and J d of levels in these nuclei.No data are yet available for excited states in 73Co, 73Ni and 73Sr. The existence and decay of a 5.8-s isomer in 73Zn remain uncertain.The isomeric decay of 107-ns isomer in 73Kr suffers from poor intensity balance at the first excited state.This evaluation supersedes earlier complete evaluations published by [Nucl.Data Sheets 69 (1993) 857], [Nucl.Data Sheets 29 (1980) 1] and [Nucl.Data Sheets 13 (1974) 305]; and an update by [Nucl.Data Sheets 51 (1987) 161].
Structure of the <sup>73</sup>As nucleus
1997, Nuclear Physics Aγ-ray, γγ-coincidence and internal conversion electron spectra of the 73Ge(p,nγ)73As reaction were measured with Ge(HP) γ and a superconducting magnetic lens plus Si(Li) electron spectrometers at 1.92, 2.27, 2.45, 2.75 and 4.0 MeV bombarding proton energies. A complete level scheme was constructed up to an excitation energy of 1.4 MeV. The spins and parities have been assigned to the levels on the basis of the Hauser-Feshbach analysis of reaction cross sections, internal conversion coefficients and decay properties of the states. Energy spectra, electromagnetic moments and transition strengths were calculated in the framework of the interacting boson-fermion model and a reasonable agreement has been obtained between the experimental and theoretical results.
Structure of <sup>74</sup>As from the (p,nγ) reaction and interpretation within IBFFM
1995, Nuclear Physics, Section Aγ-ray, internal conversion electron, and γ-coincidence spectra of the 74Ge(p,nγ)74As reaction were measured with Ge(HP) γ-ray and superconducting magnetic lens plus Si(Li) electron spectrometers at five bombarding proton energies between 3.6 and 4.7 MeV. Energies and relative intensities of 171 (among them > 105 new) 74As γ-rays, as well as 65 (including 51 new) internal conversion coefficients have been determined. A more complete level scheme, γ-ray branching ratios, level spin and parity values have been deduced. The scheme contains 52 levels, from which 18 are new. The energy spectra and electromagnetic properties were calculated using the interacting boson-fermion-fermion model. The calculations reasonably well describe the level spectra and electromagnetic properties of 72Ge, 73As, 73Ge and 74As nuclei.
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Present address: Computer Centre Limburg, Heerlen, The Netherlands.