Spectroscopy of 100Ru and 102Ru by resonance neutron capture

doi:10.1016/0375-9474(82)90174-9

Nuclear Physics A

Volume 385, Issue 2, 6 September 1982, Pages 301-318

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Abstract

Gamma-spectra from neutron capture in resolved resonances are measured to deduce the spins of low-lying ¹⁰⁰Ru and ¹⁰²Ru levels by application of the population-ratio method. The levels investigated are those having excitation energies up to 2.7 MeV and spin from I = 0 to I = 6. Improved information on the spectroscopy of ¹⁰⁰Ru and ¹⁰²Ru is obtained, consisting of some more precise or new, spin assignments, new allocations of γ-transitions, and new levels.

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Cited by (15)

Nuclear Data Sheets for A=100
2021, Nuclear Data Sheets
Evaluated experimental data are presented for 15 known nuclides of mass 100 (Kr, Rb, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In, Sn). Recommended values are given for level parameters, γ and β radiations, and other spectroscopic information. No excited states are known in ¹⁰⁰Rb and ¹⁰⁰Sn. Except for isotopic identification, no information is available for the decay of the ¹⁰⁰Kr isotope, and limited information is known about the decay properties of the ¹⁰⁰Sn isotope. According to Fig. 2 (A/Q versus counts plot) and as mentioned in the text in 2021Su01, ¹⁰⁰Br isotope was not observed, although, discovery of ¹⁰¹Br was claimed in this work. In the case of ¹⁰⁰Pd, the agreement in the orderings of the γ-ray cascades and γ-ray inventory between various studies of high-spin structures remains poor at high excitation energies (>9 MeV). For ¹⁰⁰Y, the assignments of the two previously known half-lives to the respective states (g.s. and the 145-keV isomer) remain to be established. This work supersedes earlier full evaluations of A=100 by 2008Si01, 1997Si09, 1990Si05 and 1974Ko37.
Study of vibrational signatures in 102Ru
2013, Nuclear Physics A
A ${}^{100}{Mo} (α, 2 n) {}^{102}{Ru}$ fusion evaporation experiment, performed at the HORUS cube spectrometer at the Cologne FN-Tandem accelerator, is presented and discussed. Via the analysis of γγ coincidences, it was possible to extend the level scheme with 40 new levels and 81 decays. Several new spins and multipole mixing ratios were determined using the γγ angular correlation technique. In addition, a DSAM analysis was performed and 14 new effective lifetimes were determined in the femtosecond range. Thus, several effective transition strengths were determined. Investigating the phononic structure, candidates for the quadrupole–octupole phonon multiplet $2_{1}^{+} \otimes 3_{1}^{-}$ were found. The data is compared to calculations within the Interacting Boson Model (IBM-1) in the U(5) limit, the O(6) limit as well as a transitional class U(5)–O(6). The low spin level energies show characteristics of multiphonon excitations and point towards ¹⁰²Ru resembling an anharmonic vibrational nucleus. The $B (E 2)$ transition strengths do not exactly match this picture, and are described in a better way using the U(5)–O(6) calculation.
Nuclear Data Sheets for A = 102
2009, Nuclear Data Sheets
The 1998 evaluation on mass A = 102 (1998De15) has been revised, taking into account all data available before december 2008. Detailed experimental information is presented from the neutron rich nucleus ¹⁰²Rb to the neutron deficient ¹⁰²Sn nucleus. No information on excited states of ¹⁰²Rb is available and very scarce for ¹⁰²Sr Especially new (HI,xnγ) data sets for several nuclides have been evaluated and new and more accurate data for γ intensities and multipolarities obtained. For ¹⁰²Ru very precise new data of the Budapest (n,γ) collaboration have been included.A new and very elaborated decay scheme for ¹⁰²In is obtained. Isomerism in ¹⁰²Y and ¹⁰²Nb needs further investigation due to conflicting results.
Nuclear Data Sheets for A = 100
2008, Nuclear Data Sheets
The evaluated experimental data are presented for 15 known nuclides of mass 100 (Kr, Rb, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In, Sn). High spin excitations are known for ¹⁰⁰Sr, ¹⁰⁰Zr, ¹⁰⁰Mo, ¹⁰⁰Tc, ¹⁰⁰Ru, ¹⁰⁰Rh, ¹⁰⁰Pd, ¹⁰⁰Ag, and ¹⁰⁰Cd. The neutron capture data are available for ¹⁰⁰Tc and ¹⁰⁰Ru. Particle transfer data exist for structures in ¹⁰⁰Nb, ¹⁰⁰Mo, ¹⁰⁰Tc and ¹⁰⁰Ru. The two-neutrino ββ decay mode in ¹⁰⁰Mo is fully established with measured half-life and population of the g.s. and 1130,0+ state in ¹⁰⁰Ru. The absolute energy of the isomer in ¹⁰⁰Nb is now well established from recent Penning-trap mass measurements.
Excited state data are nonexistent for ¹⁰⁰Kr, ¹⁰⁰Rb and ¹⁰⁰Sn; and only one excited state is known in ¹⁰⁰In. Except for isotopic identification, no information is available for the decay of the ¹⁰⁰Kr isotope and very little is known about the decay properties of the ¹⁰⁰Sn isotope. In the case of ¹⁰⁰Pd, there are many recent studies of high-spin structures but the agreement in the orderings of the γ-ray cascades and γ-ray inventory between various studies remains poor at high (>9 MeV) excitation energies. The energy difference between the g.s. an isomer in ¹⁰⁰Y has recently been precisely measured in Penning-Penning-trap mass measurements, however, the assignments of the two previously known half-lives and Jπ's to the respective states (g.s. and the 145-keV isomer) in ¹⁰⁰Y remains to be established. Static moments in ¹⁰⁰Y have also been recently measured for one of these states in ¹⁰⁰Y but it is not definitely known as to which of the two states (g.s. or the isomer) is connected with these measurements.
This work supersedes earlier full evaluations of A = 100 by 1997Si09, 1990Si05 and 1974Ko37.
Erratum to "Study of the vibrational nucleus 100 Ru by the 98 Mo(α,2nγ) and 99 Ru(n,γ) reactions" [Nucl. Phys. A 662 (2000) 3-43 *
2000, Nuclear Physics A
Citation Excerpt :
2075.1 keV level: A tentative 2075.1 keV level, decaying by a single 1535.6(5) keV transition, has been proposed by Babenko et al. [11]. The evaluator of the compilation [6] has indentified this transition to the 1536.1(5) γ-line observed by Coceva et al. [9], which had not been placed in the level scheme. A γ-ray close to this energy shows coincidence signals in the 687.0 keV gate implying its placement in the level scheme above 2760 keV.
The nuclear structure of ¹⁰⁰Ru was investigated using the ⁹⁹Ru(n,γ) and ⁹⁸Mo(α,2nγ) reactions. In the in-beam spectroscopy study, the use of a coincidence system equipped with five Compton-suppression spectrometers allowed to place 207 transitions in the decay scheme. Spin and parity assignments of the states were determined using angular distribution analysis together with the excitation function slopes and side-feeding intensities. The photons following the neutron capture were observed using curved crystal and pair spectrometers. Using the results of both reactions, the level scheme was extended by 36 new levels. The interpretation of the resulting level scheme was performed in the framework of the spdf interacting boson model.
Study of the vibrational nucleus 100Ru by the 98Mo(α,2nγ) and 99Ru(n,γ) reactions
2000, Nuclear Physics A
Citation Excerpt :
Consequently they are considered as highly doubtful. 2351.3 keV level: It was observed by Coceva et al. [9]. Its decay proceeds via two γ-rays of 1124.8 and 1811.8 keV to levels of spin 4+ and 2+, respectively.
The nuclear structure of ¹⁰⁰Ru was investigated using the ⁹⁹Ru(n,γ) and ⁹⁸Mo(α,2nγ) reactions. In the in-beam spectroscopy study, the use of a coincidence system equipped with five Compton-suppression spectrometers allowed to place 207 transitions in the decay scheme. Spin and parity assignments of the states were determined using angular distribution analysis together with the excitation function slopes and side-feeding intensities. The photons following the neutron capture were observed using curved crystal and pair spectrometers. Using the results of both reactions, the level scheme was extended by 36 new levels. The interpretation of the resulting level scheme was performed in the framework of the spdf interacting boson model.

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Nuclear Physics A

Abstract

References (12)

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Phys. Rev.

Cited by (15)

Nuclear Data Sheets for A=100

Study of vibrational signatures in <sup>102</sup>Ru

Nuclear Data Sheets for A = 102

Nuclear Data Sheets for A = 100

Erratum to "Study of the vibrational nucleus <sup>100</sup> Ru by the <sup>98</sup> Mo(α,2nγ) and <sup>99</sup> Ru(n,γ) reactions" [Nucl. Phys. A 662 (2000) 3-43 *

Study of the vibrational nucleus <sup>100</sup>Ru by the <sup>98</sup>Mo(α,2nγ) and <sup>99</sup>Ru(n,γ) reactions