Nuclear Data Sheets for A = 89

Journal Article · Tue Jan 15 04:00:00 EST 2013 · Nuclear Data Sheets

DOI:https://doi.org/10.1016/J.NDS.2013.01.001· OSTI ID:22309078

Singh, Balraj ^[1]

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1. Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1 (Canada)

The evaluated experimental data are presented for 14 known nuclides of mass 89 (Ge, As, Se, Br, Kr, Rb, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh). New data on high–spin excitations are available for {sup 89}Kr, {sup 89}Rb, {sup 89}Sr, {sup 89}Tc and {sup 89}Ru, including a superdeformed structure in {sup 89}Tc. Fluorescence studies in {sup 89}Y have revealed a large number of new levels in 7–11 MeV range. New two–neutron transfer data are available for {sup 89}Zr. New direct and precise measurement of atomic masses of {sup 89}Se, {sup 89}Br, 89{sup K}r, {sup 89}Rb, {sup 89}Mo and {sup 89}Tc have greatly improved the Q value landscape in this mass region. This work supersedes previous A=89 evaluation published in 1998Si31, and also the older ones 1989Si20, 1975Ko21, and M.W. Johns et al., Nuclear Data Tables A 8, 373 (1970). In spite of extensive experimental work on the isobaric nuclei of this mass chain several deficiencies remain. The identification of {sup 89}Rh isotope remains unconfirmed. The half–lives of ground states of {sup 89}Ge, {sup 89}As and {sup 89}Rh have not been measured, only the lower limits are estimated from time–of–flight in a reaction and experimental arrangement, where produced and identified. The decay schemes of {sup 89}Ge, {sup 89}As, {sup 89}Se, {sup 89}Ru and {sup 89}Rh are not known, and those for {sup 89}Tc and {sup 89}Mo are incomplete. High–lying (neutron unbound) levels in {sup 89}Kr, expected to be populated in the decay of {sup 89}Br, have not been investigated. The spins and parities for levels in {sup 89}Kr are largely unassigned, while for {sup 89}Tc and {sup 89}Ru, only few low–spin excitations are established. For {sup 89}Rb, little information is available for high–spin structures. Detailed gamma–ray data are available for {sup 88}Sr(n,γ){sup 89}Sr reaction, but most of these γ rays remain unassigned in a level scheme. Excited state data are nonexistent for {sup 89}Ge, {sup 89}As, {sup 89}Se, {sup 89}Br and {sup 89}Rh. The {sup 89}Y and {sup 89}Zr are the most extensively studied nuclei in A=89.

• OSTI ID: 22309078
• Journal Information: Nuclear Data Sheets, Journal Name: Nuclear Data Sheets Journal Issue: 1 Vol. 114; ISSN NDTSBA; ISSN 0090-3752
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ARSENIC 89
ARSENIC SELENIDES
BROMINE 89
EXCITATION
EXCITED STATES
FLUORESCENCE
GERMANIUM 89
GROUND STATES
HALF-LIFE
KRYPTON 89
MASS
MEV RANGE
MOLYBDENUM 89
NEUTRON TRANSFER
NUCLEAR DECAY
PARITY
RHODIUM 89
RUBIDIUM 89
RUTHENIUM 89
SELENIUM 89
SPIN
STRONTIUM 88
STRONTIUM 89
SUPERDEFORMED NUCLEI
TECHNETIUM 89
TIME-OF-FLIGHT METHOD
YTTRIUM 89
ZIRCONIUM 89