Gamma rays from coulomb excitation of 151Eu and 153Eu

Lewis, Tom; Graetzer, R.

doi:10.1016/0375-9474(71)90490-8

“…However, the intensities of the 286 and 307 keV transitions given by Ford er a1 (1970) from the 0 decay are (in arbitrary units) 8.2 and 100 respectively, in contrast with the present Coulomb excitation results which give a ratio of 14.7 to 100, each with small errors. Our results of $2.2 agree with those of Ford et al, while our Coulomb excitation results, in which the 286/307 intensity ratio was constant for both proton and l6O bombardments at all energies studied, are in good agreement with the CI particle induced Coulomb excitation study of Lewis and Graetzer (1971) which reports an intensity ratio of 14.3 to 100. The energy of the transition we observe in Coulomb excitation in singles is 286.17 k 0.08 keV.…”

Section: The States Near 307 Kevsupporting

confidence: 92%

“…Reasonable agreement between the B(E2)'s from the SI particle scattering and the j , ray estimates is obtained. The previous discrepancy between the particle and y ray work for the states at about 500 keV (for example, Lewis and Graetzer 1971) is removed, essentially with the inclusion of the 195.8 keV transition from the 503.4 keV state. This branch accounts for nearly 50% of the decay of this state.…”

Section: B(e2) Estimates From I 6 0 Excitationmentioning

confidence: 99%

Differential Capacitance of In-SrTiO_3-xContacts –Influence of the Electric-Field-Dependent Permittivity–

Hayashi

¹

,

Aoki

²

1980

Jpn. J. Appl. Phys.

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The N = 88 nucleus "'Eu has been studied by Coulomb excitation with 1 6 0 beams, and from the decay of '"Gd using high-resolution y ray spectroscopy. A comprehen'sive level scheme including many new transitions, new levels and spin assignments is established. The results are compared with previous studies and with the predictions of a rotational-model calculation.NUCLEAR REACTIONS 151Eu('60, 160'y), E = 2 5 4 2 MeV: measured E.,; I,.i"/ coin, py coin, o(E;, OJ, DSA. ' 5 1 E~( r , T'), E = 10 MeV; measured c ( E J ; deduced levels, J , B ( E i ) , Tl,2, branching ratios, 6. Enriched targets, Ge(Li) detectors. RADIOACTIVITY '"Gd (from 15'Eu(p. n)); measured E.,, I ; , y y coin. Ge(Li) detectors. the 4ground state of '"Gd. Despite this selectivity many of the transitions known from p decay, and not previously seen in Coulomb excitation, have been observed in the present study, allowing an energy level scheme consistent with both decay processes to be deduced.Particle reaction studies of '"Eu have been reported by Straume er a1 (1976), Burke er al (1973), Taketani er a1 (1975) and Bernstein et a1 (1970). Experimental procedure Coulomb excitation of '"EuTargets of '"Eu metal (enriched to 97% in I5'Eu) were bombarded with beams of l60 ions from the ANU EN tandem accelerator at energies between 25 and 42 MeV. All of the coincidence measurements were made at 42 MeV. In addition, singles measurements were made with a beam of 4MeV protons. The targets were usually 15 to 20 mg cm-' foils on Pb backings. .le Singles y ray measurements.The energies and intensities of y rays were studied with a 60 cm3 coaxial Ge(Li) detector, a 10 cm3 planar Ge(Li) detector and a thin-windowed 3cm3 Ge(Li) x-ray detector. The resolution of the first two detectors was about 2.2 keV at 1333 keV, and for the x-ray detector, about 0.8 keV at 122 keV. A singles spectrum is shown in figure 1. Thick target excitation functions between 25 and 42 MeV l6O energy were measured with the coaxial detector. These agreed with previous measurements which were consistent with direct E2 excitation for most of the strong lines (Lewis and Graetzer 1971, Thun andMiller 1972). Gamma ray angular distributions were measured at 42 MeV, at seven angles between 0" and 90" to the beam direction. Most of the transitions were essentially isotropic. The energies of the transitions were determined by simultaneous measurement of a ls2Eu source and of the Coulomb excitation with l60 at 90". The ls2Eu source has accurately known y ray energies in the range 122 to 1409 keV (Aubin et al 1969). The energies of the strong '"Eu lines determined in this manner were used later to 1 2 3 L 5 6

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“…Thick target excitation functions between 25 and 42 MeV l6O energy were measured with the coaxial detector. These agreed with previous measurements which were consistent with direct E2 excitation for most of the strong lines (Lewis and Graetzer 1971, Thun andMiller 1972). Gamma ray angular distributions were measured at 42 MeV, at seven angles between 0" and 90" to the beam direction.…”

supporting

confidence: 91%

An Ultrasonic Motor Using a Metal-Ceramic Composite Actuator Generating Torsional Displacement

Koç

¹

,

Doğan

²

,

Xu

³

et al. 1998

Jpn. J. Appl. Phys.

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The N = 88 nucleus "'Eu has been studied by Coulomb excitation with 1 6 0 beams, and from the decay of '"Gd using high-resolution y ray spectroscopy. A comprehen'sive level scheme including many new transitions, new levels and spin assignments is established. The results are compared with previous studies and with the predictions of a rotational-model calculation.NUCLEAR REACTIONS 151Eu('60, 160'y), E = 2 5 4 2 MeV: measured E.,; I,.i"/ coin, py coin, o(E;, OJ, DSA. ' 5 1 E~( r , T'), E = 10 MeV; measured c ( E J ; deduced levels, J , B ( E i ) , Tl,2, branching ratios, 6. Enriched targets, Ge(Li) detectors. RADIOACTIVITY '"Gd (from 15'Eu(p. n)); measured E.,, I ; , y y coin. Ge(Li) detectors. the 4ground state of '"Gd. Despite this selectivity many of the transitions known from p decay, and not previously seen in Coulomb excitation, have been observed in the present study, allowing an energy level scheme consistent with both decay processes to be deduced.Particle reaction studies of '"Eu have been reported by Straume er a1 (1976), Burke er al (1973), Taketani er a1 (1975) and Bernstein et a1 (1970). Experimental procedure Coulomb excitation of '"EuTargets of '"Eu metal (enriched to 97% in I5'Eu) were bombarded with beams of l60 ions from the ANU EN tandem accelerator at energies between 25 and 42 MeV. All of the coincidence measurements were made at 42 MeV. In addition, singles measurements were made with a beam of 4MeV protons. The targets were usually 15 to 20 mg cm-' foils on Pb backings. .le Singles y ray measurements.The energies and intensities of y rays were studied with a 60 cm3 coaxial Ge(Li) detector, a 10 cm3 planar Ge(Li) detector and a thin-windowed 3cm3 Ge(Li) x-ray detector. The resolution of the first two detectors was about 2.2 keV at 1333 keV, and for the x-ray detector, about 0.8 keV at 122 keV. A singles spectrum is shown in figure 1. Thick target excitation functions between 25 and 42 MeV l6O energy were measured with the coaxial detector. These agreed with previous measurements which were consistent with direct E2 excitation for most of the strong lines (Lewis and Graetzer 1971, Thun andMiller 1972). Gamma ray angular distributions were measured at 42 MeV, at seven angles between 0" and 90" to the beam direction. Most of the transitions were essentially isotropic. The energies of the transitions were determined by simultaneous measurement of a ls2Eu source and of the Coulomb excitation with l60 at 90". The ls2Eu source has accurately known y ray energies in the range 122 to 1409 keV (Aubin et al 1969). The energies of the strong '"Eu lines determined in this manner were used later to 1 2 3 L 5 6

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“…Additional levels result from high energy gamma rays or charged particle reactions. Deformed structures [65,66] occur in lS4Gd and lS2Sm, lS3Eu is well deformed [8][9][10][11][67][68][69]. The reaction cross sections, transition rates, branching ratios and energy spcings, have been used to identify and interpret the levels in terms of a nuclear model.…”

Section: General Remarksmentioning

confidence: 99%

Nuclear levels in152Eu

Egidy

¹

,

Kaiser

²

,

Mampe

³

et al. 1978

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The transitional nucleus 152Eu has been studied using the (n, e), (n, 7), (n .... 7), (n, 77), (d,p), (d, t) and (p, d) reactions. The experiments have been performed at nine different laboratories. A model independent level scheme was established including 95 levels below 510 keV and nearly 900 transitions by combination of low energy transitions and reaction data. More than 20 additional levels result from gamma rays and/or charged particle reactions. The level scheme is interpreted in terms of the Nilsson model indicating that 152Eu is a deformed nucleus. Seven rotational bands and Nilsson configurations are established. An additional 27 rotational bands are tentatively or speculatively assugned. Gallagher-Moszkowski splittings are discussed. The neutron binding energy was determined as 6305.2 __ 0.5 keV. The energy of the 9.3h0-isomer is 45.599keV. The lifetimes of four levels were measured.Nuclear Reactions 15tEu(n, 7), E, =thermal and resonance; measured E.~, I~,E ..... I ..... 77 coinc., 77At coinc.; lSlEu(d,p), E=12MeV and 14MeV; a53Eu(d,t), E=12MeV; 153Eu(p,d), E=18MeV; deduced level scheme of 152Eu, J, ~, T1/2, cc, Nilsson configurations. Magnetic electron spectrometer, curved crystal spectrometer, Ge(Li) and Si(Li) detectors, magnetic spectrographs. Enriched targets.

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Gamma rays from coulomb excitation of 151Eu and 153Eu

Cited by 19 publications

References 23 publications

Differential Capacitance of In-SrTiO_3-xContacts –Influence of the Electric-Field-Dependent Permittivity–

Differential Capacitance of In-SrTiO_3-xContacts –Influence of the Electric-Field-Dependent Permittivity–

An Ultrasonic Motor Using a Metal-Ceramic Composite Actuator Generating Torsional Displacement

Nuclear levels in152Eu

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Gamma rays from coulomb excitation of 151Eu and 153Eu

Cited by 19 publications

References 23 publications

Differential Capacitance of In-SrTiO3-xContacts –Influence of the Electric-Field-Dependent Permittivity–

Differential Capacitance of In-SrTiO3-xContacts –Influence of the Electric-Field-Dependent Permittivity–

An Ultrasonic Motor Using a Metal-Ceramic Composite Actuator Generating Torsional Displacement

Nuclear levels in152Eu

Contact Info

Product

Resources

About

Differential Capacitance of In-SrTiO_3-xContacts –Influence of the Electric-Field-Dependent Permittivity–

Differential Capacitance of In-SrTiO_3-xContacts –Influence of the Electric-Field-Dependent Permittivity–