Study of high-spin states in 150Eu and 151Eu

J R Jongman; J C S Bacelar; J van Pol; J Nyberg; G Sletten; J S Dionisio; C Vieu; J M Lagrange; M Pautrat; W Urban

doi:10.1016/0375-9474(95)00207-H

Study of high-spin states in 150Eu and 151Eu

J R Jongman, J C S Bacelar, J van Pol, J Nyberg, G Sletten, J S Dionisio, C Vieu, J M Lagrange, M Pautrat, W Urban

Research output: Contribution to journal › Article › Academic › peer-review

13 Citations (Scopus)

Abstract

High-spin states in Eu-150,Eu-151 were populated by the Xe-136(F-19, xn)Eu-155-xn reaction. Extensive e gamma-, gamma gamma-measurements led to new level schemes of Eu-150,Eu-151. Most observed excitations are interpreted as quasi-rotational bands built on top of multi-p-h states. Enhanced E1 decays competing with E2 transitions indicate an octupole instability of these nuclei at medium spin. Furthermore, a few negative parity bands of Eu-151 decay through large M1 interband transitions which are interpreted as rotations of a triaxial shape. The observed structures at high spin, especially for Eu-151, show the coexistence of axial and non-axial symmetric shapes.

Original language	English
Pages (from-to)	244-264
Number of pages	21
Journal	Nuclear Physics A
Volume	591
Issue number	2
DOIs	https://doi.org/10.1016/0375-9474(95)00207-H
Publication status	Published - 21-Aug-1995

Keywords

XE-136(F-19,4N), (F-19,5N), E=78, 85 MEV
ND-148(LI-7,4N), (7LI,5N), E=40, 50 MEV
MEASURED E(GAMMA), GAMMA-MULTIPLICITY, GAMMA-GAMMA(T), E-GAMMA(T), DCO-RATIOS
EU-151, EU-150 DEDUCED LEVELS, J, PI, ICC, NORDBALL MULTI-GE-DETECTOR ARRAY,
BAF2-MULTIPLICITY FILTER, CRYO-TARGET, E-GAMMA-SPECTROMETER, ISOTOPICALLY ENRICHED TARGETS
NUCLEI
SHAPES
SPECTRA

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Study of high-spin states in 150Eu and 151Eu
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title = "Study of high-spin states in 150Eu and 151Eu",

abstract = "High-spin states in Eu-150,Eu-151 were populated by the Xe-136(F-19, xn)Eu-155-xn reaction. Extensive e gamma-, gamma gamma-measurements led to new level schemes of Eu-150,Eu-151. Most observed excitations are interpreted as quasi-rotational bands built on top of multi-p-h states. Enhanced E1 decays competing with E2 transitions indicate an octupole instability of these nuclei at medium spin. Furthermore, a few negative parity bands of Eu-151 decay through large M1 interband transitions which are interpreted as rotations of a triaxial shape. The observed structures at high spin, especially for Eu-151, show the coexistence of axial and non-axial symmetric shapes.",

keywords = "XE-136(F-19,4N), (F-19,5N), E=78, 85 MEV, ND-148(LI-7,4N), (7LI,5N), E=40, 50 MEV, MEASURED E(GAMMA), GAMMA-MULTIPLICITY, GAMMA-GAMMA(T), E-GAMMA(T), DCO-RATIOS, EU-151, EU-150 DEDUCED LEVELS, J, PI, ICC, NORDBALL MULTI-GE-DETECTOR ARRAY,, BAF2-MULTIPLICITY FILTER, CRYO-TARGET, E-GAMMA-SPECTROMETER, ISOTOPICALLY ENRICHED TARGETS, NUCLEI, SHAPES, SPECTRA",

author = "Jongman, {J R} and Bacelar, {J C S} and {van Pol}, J and J Nyberg and G Sletten and Dionisio, {J S} and C Vieu and Lagrange, {J M} and M Pautrat and W Urban",

year = "1995",

month = aug,

day = "21",

doi = "10.1016/0375-9474(95)00207-H",

language = "English",

volume = "591",

pages = "244--264",

journal = "Nuclear Physics A",

issn = "0375-9474",

publisher = "ELSEVIER SCIENCE BV",

number = "2",

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T1 - Study of high-spin states in 150Eu and 151Eu

AU - Jongman, J R

AU - Bacelar, J C S

AU - van Pol, J

AU - Nyberg, J

AU - Sletten, G

AU - Dionisio, J S

AU - Vieu, C

AU - Lagrange, J M

AU - Pautrat, M

AU - Urban, W

PY - 1995/8/21

Y1 - 1995/8/21

N2 - High-spin states in Eu-150,Eu-151 were populated by the Xe-136(F-19, xn)Eu-155-xn reaction. Extensive e gamma-, gamma gamma-measurements led to new level schemes of Eu-150,Eu-151. Most observed excitations are interpreted as quasi-rotational bands built on top of multi-p-h states. Enhanced E1 decays competing with E2 transitions indicate an octupole instability of these nuclei at medium spin. Furthermore, a few negative parity bands of Eu-151 decay through large M1 interband transitions which are interpreted as rotations of a triaxial shape. The observed structures at high spin, especially for Eu-151, show the coexistence of axial and non-axial symmetric shapes.

AB - High-spin states in Eu-150,Eu-151 were populated by the Xe-136(F-19, xn)Eu-155-xn reaction. Extensive e gamma-, gamma gamma-measurements led to new level schemes of Eu-150,Eu-151. Most observed excitations are interpreted as quasi-rotational bands built on top of multi-p-h states. Enhanced E1 decays competing with E2 transitions indicate an octupole instability of these nuclei at medium spin. Furthermore, a few negative parity bands of Eu-151 decay through large M1 interband transitions which are interpreted as rotations of a triaxial shape. The observed structures at high spin, especially for Eu-151, show the coexistence of axial and non-axial symmetric shapes.

KW - XE-136(F-19,4N), (F-19,5N), E=78, 85 MEV

KW - ND-148(LI-7,4N), (7LI,5N), E=40, 50 MEV

KW - MEASURED E(GAMMA), GAMMA-MULTIPLICITY, GAMMA-GAMMA(T), E-GAMMA(T), DCO-RATIOS

KW - EU-151, EU-150 DEDUCED LEVELS, J, PI, ICC, NORDBALL MULTI-GE-DETECTOR ARRAY,

KW - BAF2-MULTIPLICITY FILTER, CRYO-TARGET, E-GAMMA-SPECTROMETER, ISOTOPICALLY ENRICHED TARGETS

KW - NUCLEI

KW - SHAPES

KW - SPECTRA

U2 - 10.1016/0375-9474(95)00207-H

DO - 10.1016/0375-9474(95)00207-H

M3 - Article

SN - 0375-9474

VL - 591

SP - 244

EP - 264

JO - Nuclear Physics A

JF - Nuclear Physics A

IS - 2

ER -

Study of high-spin states in 150Eu and 151Eu

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