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Nuclear Structure and Decay Data for A=149 Isobars

Journal Article · · Nuclear Data Sheets
 [1];  [2]
  1. McMaster Univ., Hamilton, ON (Canada); FRIB/Michigan State University
  2. Michigan State Univ., East Lansing, MI (United States)

Here, experimental nuclear structure and decay data are evaluated for all the 17 known nuclides of mass 149 (Xe, Cs, Ba, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb). Detailed compiled and evaluated spectroscopic information is presented for each reaction and decay dataset, and recommended values are provided for level properties, α, β and γ radiations, and other spectroscopic parameters, based on an evaluation of all the available experimental data for A=149 isobaric nuclides. Although large amounts of nuclear spectroscopic data are available for nuclides of A=149, yet large gaps in knowledge exist, as described below. For the lowest atomic number nuclide 149Xe, only the isotopic identification has been made, with no data for its ground-state half-life. For 149Cs, 149Tm and 149Yb information is available for only the respective ground states. For 149Ba, 149La and 149Er, limited data exist for excited states. Many of the decay schemes of radioactive nuclei of A=149 are considered as incomplete, either due to large energy differences between the highest observed excited states in daughter nuclides and the respective Q-values, or due to the lack of confirmed γ-ray data, as listed below: 149Cs → 149Ba, 149Ba → 149La, 149La → 149Ce, 149Ce → 149Pr, 149Pr → 149Nd, 149Tb(4.17 min) → 149Gd, 149Ho(21.0 s and 56 s) → 149Dy, 149Er(4 s and 9.6 s) → 149Ho, and 149Tm → 149Er. No data exist for the decay of 149Yb to 149Tm. Data for half-lives of the excited states in this mass chain are generally lacking as given below by the number of excited levels of known half-life / approximate number of known levels in a nuclide: 2/17 for 149Ba, 0/18 for 149La, 3/53 for 149Ce, 3/44 for 149Pr, 17/110 for 149Nd, 9/90 for 149Pm, 10/210 for 149Sm, 2/125 for 149Eu, 6/270 for 149Gd, 5/200 for 149Tb, 3/80 for 149Dy, 3/90 for 149Ho, and 3/14 for 149Er. This work supersedes earlier evaluations of A=149 nuclides published by 2004Si16, 1994Si18, 1985Sz01 and 1976Ho17.

Research Organization:
Michigan State Univ., East Lansing, MI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
SC0016948
OSTI ID:
1905079
Alternate ID(s):
OSTI ID: 1961442
OSTI ID: 1991185
Journal Information:
Nuclear Data Sheets, Journal Name: Nuclear Data Sheets Vol. 185; ISSN 0090-3752
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Band structure in the N=88 isotones Pm 149 , Eu 151 , and Tb 153 journal September 1985
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Single-particle states insup149Er andsup149Ho, and the effect of theZ=64closure journal July 1985
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Decay of Er g + m 149 by positron and delayed proton emission and by electron capture journal January 1989
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Conversion electron spectroscopy at the fragment mass analyzer focal plane: Studies of isomeric decays near the proton drip line journal September 1995
Cranking Bohr-Mottelson Hamiltonian applied to superdeformed bands in theA∼150 region journal July 1995
Radioactivity of neutron deficient isotopes in the region N >82> Z journal February 1996
Single-particle states inDy8366149at high spin journal October 1996
Identification of γ transitions in Ba 147 , Ce 149 , and Nd 1 5 1 , 1 5 3 journal August 1996
Proton emission from drip-line nuclei 157 Ta and 161 Re journal April 1997
Spectroscopy of neutron-rich odd-ACe isotopes journal September 1997
Extended spectroscopy in the superdeformed well of 1 4 8 , 1 4 9 Gd nuclei journal March 1998
Quadrupole moments and identical superdeformed bands in149Tb journal September 1998
Rotational bands in 101 – 103 Nb and 9 8 , 1 0 0 Y nuclei and identification of yrast bands in 146 La and 149 Pr journal December 1998
Evidence for superdeformation in149,150Dy:Onset of the collapse of theZ=66deformed shell closure? journal February 2000
Possible octupole correlation in 147 Pr and π h 1 1 / 2 bands in 1 4 9 , 1 5 1 Pr journal August 2000
Enhanced population of superdeformation in the massA=150region journal March 2002
Level densities and γ -strength functions in 1 4 8 , 1 4 9 Sm journal March 2002
Search for quenching of the electric dipole momentD0in149Ce journal August 2003
Neutron single-particle states populated via proton emission from 146 Tm and 150 Lu journal September 2003
Proton decay study of Lu 150 and Lu m 150 journal November 2003
Short-Lived Isomers of Tb 148 and Tb 147 journal April 1973
Measurement ofα-Decay Branching Ratios forDy150,151andTbm149 journal June 1973
β -delayed proton decays near the proton drip line journal May 2005
Neutron capture cross sections ofGd148and the decay ofGd149 journal October 2006
Near-yrast structure of the La 149 nucleus journal September 2007
Studies of the Recoil Properties of Products of the Interaction ofU238with 11.5-GeV Protons journal October 1973
X-Ray Isotope Shifts and Variations of Nuclear Charge Radii in Isotopes of Nd, Sm, Dy, Yb, and Pb journal August 1973
Nuclear spectroscopy above isomers in 67 148 Ho 81 and 67 149 Ho 82 nuclei: Search for core-excited states in Ho 149 journal April 2010
Near-yrast structure of Pr 149 journal December 2010
Odd-even147−153Pm isotopes within the neutron-proton interacting boson-fermion model journal February 2011
Band structure of 149 Ce journal July 2012
Examination of different strengths of octupole correlations in neutron-rich Pr and Pm isotopes journal October 2012
Characterizing the atomic mass surface beyond the proton drip line viaα-decay measurements of theπs1/2ground state of165Re and theπh11/2isomer in161Ta journal December 2012
Shape phase transition and phase coexistence in odd Sm nuclei journal July 2013
Photoneutron cross sections for samarium isotopes: Toward a unified understanding of ( γ , n ) and ( n , γ ) reactions in the rare earth region journal December 2014
Role ofp-induced population of medium-mass(A∼150)neutron-rich nuclei journal February 2015
Xe 136 + Pb 208 reaction: A test of models of multinucleon transfer reactions journal June 2015
Identification of new transitions and mass assignments of levels in Pr 143 – 153 journal September 2015
Signatures of shape phase transitions in odd-mass nuclei journal December 2016
High precision half-life measurement of Sm 147 α decay from thin-film sources journal March 2017
Evolution of deformation in neutron-rich Ba isotopes up to A = 150 journal February 2018
Nuclear quantum shape-phase transitions in odd-mass systems journal March 2018
Ordinary muon capture studies for the matrix elements in β β decay journal February 2019
Nuclear level densities and γ -ray strength functions in samarium isotopes journal May 2019
94   β -Decay Half-Lives of Neutron-Rich Cs 55 to Ho 67 : Experimental Feedback and Evaluation of the r -Process Rare-Earth Peak Formation journal February 2017
Nanosecond-Scale Proton Emission from Strongly Oblate-Deformed Lu149 journal March 2022
Inner-Core Neutron-Hole State1h112in Odd Nd and Sm Isotopes journal May 1977
Superdeformed band up to spin ∼(127/2 in ^{149}Gd journal February 1988
Feeding of Discrete-Line Superdeformed Bands at Very High Spin journal September 1988
Deexcitation from superdeformed bands in Tb 151 and neighboring A ∼150 nuclei journal October 1993
Δ I =4 bifurcation in a superdeformed band: Evidence for a C 4 symmetry journal December 1993
Multiparticle excitations and identical bands in the superdeformedGd149nucleus journal August 1993
Lifetime Measurements of Superdeformed Bands in 148 – 149 Gd and 152 Dy :Evidence for Structure-Dependent Elongations journal June 1996
Odd-Odd Deformed Proton Emitters journal February 2001
Observation of the 22.5-keV Resonance inS149mby the Nuclear Lighthouse Effect journal July 2001
THE DECAY OF Pm149 journal December 1960
Hyperfine interactions in the J = 5 states of 147Sm and 149Sm journal November 1968
Precise Atomic-Mass Differences in the Region journal January 1972
The 149,151Sm(p,t)147,149Sm Reactions journal January 1973
A Study of Levels in 149Nd using the (d, t) and (3He, α) Reactions journal February 1973
Measurement and Evaluation of the Activation Resonance Integral of 146Nd, 148Nd, and 150Nd journal July 1973
States in the N  = 87 Nuclei 149 Sm and 151 Gd Populated by the (d, t) and ( 3 He,α) Reactions journal June 1975
Study of high spin states in 149Tb observed by the (10B,3n) reaction journal November 1979
Yield of deep spallation products of medium to heavy mass targets bombarded with 480 MeV protons journal June 1980
Levels in 149Nd studied with the reaction journal September 1981
Alpha-decay widths and equivalence of optical potentials journal September 1985
First structure information on the exotic 149 La from the $\beta^-$ -decay of 149 Ba journal June 2004
The βdecay of 147Cs to 147Ba journal January 2005
A new high-spin level scheme for 149Nd from a fusion-fission reaction journal May 2006
β-delayed proton decays and spin assignments for 133Sm and 149Yb journal August 2006
Quenching of the E1 strength in 149Nd journal May 2010
Improved characteristics of the 22.5 keV (M1 + E2) nuclear transition in 149Sm journal May 2011
Experimental investigation of ligand effects on the conversion electron spectrum of the 22.5 keV M1 + E2 nuclear transition in 149Sm journal July 2011
Search for $\alpha$ decay of 151Eu to the first excited level of 147Pm using underground $\gamma$ -ray spectrometry journal November 2012
New results from isochronous mass measurements of neutron-rich uranium fission fragments with the FRS-ESR-facility at GSI journal May 2016
Systematics of high-spin isomers in N = 83 isotones and a high-spin isomer beam journal January 2002
A study of nuclear structure properties of even and odd 103–140Sb, 105–143Te, 107–145I, 109–148Xe and 112–151Cs nuclei in the axial deformation journal August 2018
Identification of the $\nu_{\frac 32}-[521]$ Band in 153 Nd and the γ-Transitions in 149 Nd journal June 1997
The ( p , t ) and ( p , d ) Reactions on the Nd isotopes of A =142–150 journal December 1971
Determination of the Nuclear Matrix Elements for the Beta-Decay of149Pm journal March 1980
Energy Levels and γ-Ray Transitions in149Pm journal April 1986
Changes of the Nuclear Charge Distribution of Nd, Sm, Gd and Dy from Optical Isotope Shifts journal August 1990
g-Factor of the 27/2+Isomeric State in149Tb journal January 1990
QβMeasurements of Neutron-Rich Isotopes in the Mass Region 147≤A≤152 journal September 1995
Hyperfine Constants and Tensor Polarizabilities of4f66s6p9G0–6States in Sm I journal June 1999
Nuclear Resonant Scattering of Synchrotron Radiation by121Sb and149Sm journal March 2000
Neutron Capture and Transmission Measurements and Resonance Parameter Analysis of Samarium journal September 2002
Resonance and Thermal-Neutron Total Cross Sections for Promethium-147 and Promethium-148m journal November 1973
Die Aktivierung der seltenen Erden durch thermische Neutronen II journal April 1946
Precise Atomic Mass Differences Involving Isotopes of Nd, Sm, Cd, and Pb journal February 1966
The Thermal Neutron Cross Section and the Resonance Integral of 146Nd, 148Nd, 150Nd and 41K journal November 1972
Decay Properties of Some Neutron-Rich Praseodymium Isotopes journal May 1976
Negative-muon capture in 150Sm journal June 2010
Identification of New Neutron-Rich Isotopes in the Rare-Earth Region Produced by 345 MeV/nucleon 238 U journal January 2018
Observation of New Neutron-rich Isotopes among Fission Fragments from In-flight Fission of 345 MeV/nucleon 238 U: Search for New Isotopes Conducted Concurrently with Decay Measurement Campaigns journal January 2018

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