SUCCESSIVE DECAYS FROM Pr137 AND Ce137m: DECAY OF ADJACENT PRASEODYMIUM ISOTOPES

1958 ◽  
Vol 36 (11) ◽  
pp. 1487-1508 ◽  
Author(s):  
G. T. Danby ◽  
J. S. Foster ◽  
A. L. Thompson
Keyword(s):  
Excited State ◽  
Small Group ◽  
Electron Capture ◽  
High Spin ◽  
Gamma Rays ◽  
Isomeric State ◽  
Ground State ◽  
Branching Ratios ◽  
Spin States ◽  
High Spin States

The decay of Pr137 entirely to a 9.0-hour ground state of Ce137 was independently discovered. By allowed electron capture, Ce137 decays predominantly to a low-lying state of La137, with only a 3% branching to a 440-kev excited state. The 440-kev transition is at least predominantly E2 in character.A 34.4-hour isomeric state produced by the La139(p, 3n)Ce137m reaction decays by a 254.5-kev M4 transition to the 9-hour -ground state. A 0.6% branching was found from the isomeric state directly to a small group of apparently high spin states in La137.Studies of mass-separated isotopes confirmed the existence of 1.5-hour Pr137 and 1.0-hour Pr136. The K-capture to positron branching ratios observed in the decay of Pr139, Pr138, Pr137, and Pr136 show that these isotopes decay by allowed transitions to their cerium daughters. Characteristic gamma rays were observed.

Decay of 90Kr and 90Rb

1970 ◽  
Vol 48 (17) ◽  
pp. 2056-2082 ◽  
Author(s):  
J. F. Mason ◽  
M. W. Johns
Keyword(s):  
Excited States ◽  
High Spin ◽  
Isomeric State ◽  
Ground State ◽  
Gamma Ray ◽  
Spin States ◽  
Decay Energy ◽  
Excitation Energies ◽  
High Spin States ◽  
Gamma Ray Detectors

The decay of 32 s 90Kr and 154 s 90Rb has been studied using NE102 beta detectors and NaI(Tl) and Ge(Li) gamma-ray detectors, singly and in coincidence. Thirteen excited states of 90Rb involving 35 transitions have been identified with excitation energies of 0.1064, 0.1215, 0.2419, 0.3557, 0.6144, 0.6610, 0.7408, 0.8375, 1.2402, 1.6740(1+), 1.7798(1+), 2.1261(1+), and 3.0937(1+) MeV. The 256 s isomeric state at an excitation of 0.1064 MeV (probably 4–) feeds high spin states of 90Sr at 2.2068, 2.4972, 2.5712, 2.9275, 3.5835, 4.1485, 4.3355, and 5.0397 MeV with a total intensity of 12%. The 154 s ground state of 90Rb feeds many low spin states in 90Sr, including the levels at 0.8315, 1.6555, 1.8921, 2.5271, 3.0385, 3.3833, 3.4497, 3.8985, 4.0325, 4.0360, 4.1360, 4.3660, 4.6466, 4.891, 4.921, 4.974, 5.070, 5.091, 5.163, 5.1876, 5.2540, 5.285, and 5.3336 MeV. Sixty-four transitions in 90Sr have been classified in this manner. The decay energy of 90Kr is 4.41 ± 0.03 MeV.

High-spin states in109Sn and their decay to the ground state

1995 ◽  
Vol 351 (2) ◽  
pp. 123-124 ◽  
Author(s):  
L. K�ubler ◽  
H. Prade ◽  
J. Reif ◽  
R. Schwengner ◽  
G. Winter ◽  
...  
Keyword(s):  
High Spin ◽  
Ground State ◽  
Spin States ◽  
High Spin States

Experimental study of high spin states in the ground state bands of158,160Er,164,166Yb, and168Hf

1972 ◽  
Vol 257 (2) ◽  
pp. 147-176 ◽  
Author(s):  
R. M. Lieder ◽  
H. Beuscher ◽  
W. F. Davidson ◽  
P. Jahn ◽  
H. -J. Probst ◽  
...  
Keyword(s):  
Experimental Study ◽  
High Spin ◽  
Ground State ◽  
Spin States ◽  
High Spin States

SEARCH FOR SIGNATURE INVERSION IN THE πi13/2 ⊗ νi13/2 BANDS IN 182,184,186Au

2006 ◽  
Vol 15 (07) ◽  
pp. 1437-1445 ◽  
Author(s):  
Y. H. ZHANG ◽  
X. H. ZHOU ◽  
J. J. HE ◽  
Z. LIU ◽  
Y. D. FANG ◽  
...  
Keyword(s):  
High Spin ◽  
Ground State ◽  
Spin Assignment ◽  
Spin States ◽  
Japan Atomic Energy Agency ◽  
Ground State Band ◽  
Energy Agency ◽  
Signature Inversion ◽  
High Spin States ◽  
State Band

Search for low-spin signature inversion in the πi13/2 ⊗ νi13/2 bands in odd-odd 182,184,186 Au has been conducted through the standard in-beam γ-spectroscopy techniques. The experiments for 182 Au and 186 Au have been performed in the Japan Atomic Energy Agency (JAEA) via the 152 Sm (35 Cl ,5 n )182 Au and 172 Yb (19 F ,5 n )186 Au reactions, respectively. A study of 184 Au has been made using a multi-detector array GASP in LNL, Italy, via the 159 Tb (29 Si ,4 n )184 Au reaction. The πi13/2 ⊗ νi13/2 bands in these three nuclei have been identified and extended up to high-spin states. In particular, the inter-band connection between the πi13/2 ⊗ νi13/2 band and the ground-state band in 184 Au has been established, leading to a firm spin-and-parity assignment for the πi13/2 ⊗ νi13/2 band. The low-spin signature inversion is found in the πi13/2 ⊗ νi13/2 bands in 182,184,186 Au according to our spin-assignment and the signature crossing observed at high-spin states.

Levels in 146Sm Populated by the Decay of 146Eu and the (α,2n), (d,t), and (3He,α) Reactions

1975 ◽  
Vol 53 (4) ◽  
pp. 391-410 ◽  
Author(s):  
B. Singh ◽  
M. W. Johns
Keyword(s):  
Electron Capture ◽  
High Spin ◽  
Spin States ◽  
High Spin States ◽  
Electron Spectra

The levels in 146Sm have been investigated through the electron capture of 146Eu, and by means of the (α,2n), (d,t), and (3He,α) particle reactions. Spins and parities of a large number of levels have been determined by combining the results of γγ(θ) and γ(θ) distributions in the electron capture and (α,2n) reactions respectively and electron spectra associated with the (α,2n) reaction. The low lying states of 146Sm can be interpreted in terms of the vibrational model. The high spin states populated at higher excitation seem to be associated with particle excitations.

Novel Organic Ions of High-Spin States. 5. Generation of a High-Spin Ground-State Anion from an Intramolecularly Spin-Frustrated System

1996 ◽  
Vol 118 (36) ◽  
pp. 8684-8687 ◽  
Author(s):  
Toshihiro Nakamura ◽  
Takamasa Momose ◽  
Tadamasa Shida ◽  
Kazunobu Sato ◽  
Shigeaki Nakazawa ◽  
...  
Keyword(s):  
High Spin ◽  
Ground State ◽  
Spin States ◽  
Organic Ions ◽  
High Spin States ◽  
Spin Ground State

E2Matrix Elements Between High-Spin States in the Ground-State Bands ofSm152andSm154

1969 ◽  
Vol 23 (18) ◽  
pp. 1051-1054 ◽  
Author(s):  
I. A. Fraser ◽  
J. S. Greenberg ◽  
S. H. Sie ◽  
R. G. Stokstad ◽  
D. A. Bromley
Keyword(s):  
High Spin ◽  
Ground State ◽  
Spin States ◽  
High Spin States

The Decay of 117Cd and 117Cdm

1972 ◽  
Vol 50 (17) ◽  
pp. 2012-2026 ◽  
Author(s):  
P. R. Gregory ◽  
M. W. Johns
Keyword(s):  
High Resolution ◽  
High Spin ◽  
Ground State ◽  
Energy Levels ◽  
Spin States ◽  
Β Decay ◽  
High Spin States ◽  
Coincidence Data ◽  
Weak Transitions

The energy levels of 117In have been investigated following the β decay of 3.4 h 117Cdm and 2.5 h 117Cdg. Using high resolution Ge(Li) detectors singly and in coincidence, 127γ transitions have been observed. Eighty-five of these transitions have been classified by both coincidence data and energy fit, 29 weak transitions by energy fit alone, and 12 remain unclassified. Thirty-seven levels in 117In have been established; of these, 24 are low spin states fed from the ground state and 13 are high spin states fed from the isomer. Spin and parity assignments for the newly established levels are discussed.

scholarly journals Different seniority states of $^{119-126}$Sn isotopes: shell-model description

2019 ◽  
Vol 2019 (10) ◽  
Author(s):  
Praveen C Srivastava ◽  
Bharti Bhoy ◽  
M J Ermamatov
Keyword(s):  
Experimental Data ◽  
Shell Model ◽  
High Spin ◽  
Isomeric State ◽  
Model Description ◽  
Spin States ◽  
Model Calculations ◽  
Successive Pair ◽  
High Spin States ◽  
Isomeric States

Abstract In the present work, available experimental data up to high-spin states of $^{119-126}$Sn isotopes with different seniority ($v$), including $v = 4$, 5, 6, and 7, are interpreted with the shell model, by performing shell-model calculations in the 50–82 valence shell composed of $1g_{7/2}$, $2d_{5/2}$, $1h_{11/2}$, $3s_{1/2}$, and $2d_{3/2}$ orbitals. The results are compared with the available experimental data. These states are described in terms of broken neutron pairs occupying the $h_{11/2}$ orbital. Possible configurations of seniority isomers in these nuclei are discussed. The breaking of three neutron pairs is responsible for generating high-spin states. The isomeric states $5^-$, $7^-$, $10^+$, and $15^-$ of even Sn isotopes, and isomeric states $19/2^+$, $23/2^+$, $27/2^-$, and $35/2^+$ of odd Sn isotopes, are described in terms of different seniority. For even Sn isotopes, the isomeric states $5^-$, $7^-$, and $10^+$ are due to seniority $v = 2$; the isomeric state $15^-$ is due to seniority $v = 4$, and, in the case of odd Sn isotopes, the isomeric states $19/2^+$, $23/2^+$, and $27/2^-$ are due to seniority $v = 3$, and the isomeric state $35/2^+$ in $^{123}$Sn is due to seniority $v = 5$. These are maximally aligned spins, which involve successive pair breakings in the $\nu (h_{11/2})$ orbital.

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