Conversion-Coefficient Measurements and Spin-Parity Assignments for Excited Levels in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Xe</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>1</mml:mn><mml:mn>3</mml:mn><mml:mn>3</mml:mn><mml:mo>,</mml:mo><mml:mspace /><mml:mn>1</mml:mn><mml:mn>3</mml:mn><mml:mn>5</mml:mn><mml:mo>,</mml:mo><mml:mspace /><mml:mn>1</mml:mn><mml:mn>3</mml:mn><mml:mn>6</mm

A fast-timing setup has been developed to measure the nuclear-state half-lives of neutron-rich nuclei. The first on-line measurements were performed on 137,139 Cs obtained from the β − decay of 137,139 Xe. These neutron-rich Xe nuclei were produced by the 238 U photofission induced by the 50 MeV electron beam delivered by the ALTO facility. The half-lives of the first excited state in 137 Cs and of six excited states in 139 Cs were measured for the first time. Taking into account new information given by the deduced transition probabilities, we discuss the structure of the first excited states in 137,139 Cs: it is shown that, in both nuclei, the first excited 5 2 + level corresponds mainly to the one-proton state issued from the π2d 5/2 orbital and that the most probable spin values for the states located at 289.8, 393.5, and 393.8 keV in 139 Cs are 5 2

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“…The multipolarity of the transitions is taken from ref. [16]. The 175.0 keV transition, not known as a doublet in ref.…”

Section: A = 139 Resultsmentioning

confidence: 99%

“…The 175.0 keV transition, not known as a doublet in ref. [16], was reported as a M1(E2) transition; here, one of the 175.0 keV transitions is assumed to have the E2 multipolarity and the other one the M1 multipolarity.…”

Section: A = 139 Resultsmentioning

confidence: 99%

Half-life measurements of 137, 139Cs excited nuclear states

et al. 2011

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“…Résultats des mesures de coïncidences y-y Les intensités des branches et les valeurs des log ft sont déduites de la balance d'intensité des transitions y pour chaque niveau. Les intensités y absolues sont déduites de la valeur citée plus haut pour [(Po) et du coefficient de conversion aK = 0,009 de la transition de 455 keV, mesuré par Achterberg et al [6]. La conversion interne des autres transitions aboutissant au fondamental a été négligée, vu leur faible intensité et leur énergie.…”

Section: Tableau Ilunclassified

Niveaux de 137Cs alimentés dans la désintégration de 137Xe

et al. 1975

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“…work was in progress, but this study was continued because it adds to the completeness and accuracy of the level scheme as studied through beta decay. In most cases this work and the most recent other works(29,30,31) agree, giving assurance of the validity of the results. in other cases, this work provides information that in the other experiments was lacking and which had led to erroneous results, in the…”

supporting

confidence: 83%

“…4^ or 6^ spin and parity assignment. Achterberg et al(31) first determined that the 2445-keV state is definitely 3^ and then measured the multipolarity of the transition between the 2445-andTable 11. Compilation of levels in Ba found In this work and previous works keV states to be Ml, suggesting a spin and parity assignment for the 1898-keV level of 2^, 3"*", or 4^.…”

mentioning

confidence: 99%

The decays of 138Xe and 138Cs

Carlson

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A. TRISTAN On-line System 13 B. Isobaric Separation of A=138 Activities 13 C. Detectors and Electronics 17 D. Gamma-ray Singles Counting Methods 19 E. Coincidence Counting Methods 19 F. Low-energy Gamma-ray Detection 23 III. DATA ANALYSIS 26 A. Singles Experiments 26 B. Gamma-gamma Coincidence Experiments 3] C. Level Scheme Construction 33 D. Beta-spectrum Analysis 34 E. Log ft Calculation 40 IV. RESULTS 42 A. '^®Cs Decay 42 B. '^^Xe Decay 61

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Conversion-Coefficient Measurements and Spin-Parity Assignments for Excited Levels inXe133,135,136

Cited by 32 publications

References 56 publications

Half-life measurements of 137, 139Cs excited nuclear states

Half-life measurements of 137, 139Cs excited nuclear states

Niveaux de 137Cs alimentés dans la désintégration de 137Xe

The decays of 138Xe and 138Cs

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