The nuclear structure of 166Er

1979 ◽  
Vol 57 (11) ◽  
pp. 1999-2025 ◽  
Author(s):  
J. D. Panar ◽  
D. G. Burke
Keyword(s):  
Proton Transfer ◽  
Excitation Energy ◽  
Ground State ◽  
Transfer Reactions ◽  
Angular Distributions ◽  
Neutron Transfer ◽  
Reaction Products ◽  
Proton Transfer Reactions ◽  
Photographic Emulsions ◽  
Transfer Study

Two-quasiparticle states in 166Er have been studied using the 167Er(d,t)166Er, 167Er(3He.α)166Er, 165Ho(3He,d)166Er, and 165Ho(α,t)166Er reactions. Beams of 15 MeV deuterons, 24 MeV 3He2+, and 27 MeV 4He2+ particles were produced by the McMaster University tandem Van de Graaff accelerator. The reaction products were analyzed with an Enge split-pole magnetic spectrograph and detected with photographic emulsions. Angular distributions were obtained for the (d,t) and (3He,d) reactions for levels up to ~2700 keV in excitation energy, although selected peaks were investigated at somewhat higher energies. The interpretation of the data was performed within the framework of the Unified model, incorporating pairing effects. In the neutron transfer study, two-quasiparticle states formed by removing a particle from the predominantly 7/2+[633] 167Er ground state were investigated, whereas the proton transfer study dealt with two-quasiparticle states formed by adding a particle to the 7/2−[523] ground state of 165Ho. Several previous assignments have been supported and many new ones are proposed. Several other assignments proposed in an earlier proton transfer study have been found to be incorrect. Earlier observations that some levels were populated in both the neutron transfer and proton transfer reactions have been confirmed and extended. In addition, the observation in the (d,t) reaction of several states populated by l = 0 neutron transfers has been interpreted in terms of a complex mixing scheme involving the 7/2+[633] ± 1/2+[400] configurations.

Odd Proton States in 165Tm, 167Tm, 169Tm, and 171Tm

1974 ◽  
Vol 52 (21) ◽  
pp. 2108-2126 ◽  
Author(s):  
H. C. Cheung ◽  
D. G. Burke ◽  
G. Løvhøiden
Keyword(s):  
Proton Transfer ◽  
Nuclear Structure ◽  
Cross Sections ◽  
Quadrupole Deformation ◽  
Angular Distributions ◽  
Coriolis Coupling ◽  
Reaction Products ◽  
Structure Factors ◽  
Nilsson Model ◽  
Photographic Emulsions

Proton states in the odd mass isotopes 165Tm, 167Tm, 169Tm, and 171Tm have been studied using (3He, d) and (α, t) reactions with 24 MeV 3He and 27 MeV 4He beams. The reaction products were analyzed with a magnetic spectrograph and detected with photographic emulsions, giving a resolution (FWHM) of 16–18 keV. The proton transfer l values were determined from (3He, d) angular distributions and from the ratios of (3He, d) and (α, t) cross sections. Nuclear structure factors, extracted using DWBA cross sections, were compared to those predicted by the Nilsson model with pairing corrections and Coriolis coupling included. Most of the previous assignments for low lying proton states have been confirmed, and several new ones were made. It is shown that the energy systematics of the intrinsic proton states cannot be attributed to variations in the quadrupole deformation, ε2, but can be explained by a small monotonic variation in the hexadecapole deformation, ε4.

Proton-Transfer Reactions between 7-Hydroxycoumarin and Tertiary Amines. Formation of the Ground-State Tautomer Anion

1996 ◽  
Vol 100 (4) ◽  
pp. 505-507 ◽  
Author(s):  
Tadamitsu Sakurai ◽  
Hiroki Mizoguchi ◽  
Satoshi Yamada ◽  
Hiroyasu Inoue
Keyword(s):  
Proton Transfer ◽  
Ground State ◽  
Transfer Reactions ◽  
Tertiary Amines ◽  
Proton Transfer Reactions

A study of levels in 147Nd using the (d,t) reaction

1977 ◽  
Vol 55 (19) ◽  
pp. 1687-1696 ◽  
Author(s):  
O. Straume ◽  
D. G. Burke
Keyword(s):  
Ground State ◽  
State Transition ◽  
Energy Levels ◽  
Striking Similarity ◽  
Angular Distributions ◽  
Reaction Products ◽  
Proton Group ◽  
Energy Proton ◽  
Photographic Emulsions ◽  
Peak Widths

The 148Nd(d,t)147Nd reaction has been studied using 12 MeV deuterons. The reaction products were analyzed with an Enge-type magnetic spectrograph and detected with photographic emulsions, giving peak widths (FWHM) of approximately 8 keV. The present results confirm previous indications that the highest energy proton group found in an early 146Nd(d,p) investigation does not correspond to the ground state transition, but to the level at an excitation energy of 50 keV. The (d,t) angular distributions were used to determine l-values for a number of transitions. A striking similarity is noted with the energy levels and spectroscopic strengths previously found in the isotones 149Sm and 151Gd. With the exception of the h11/2 state, it is possible to explain the observed strengths in terms of the spherical shell model, although there is fragmentation of the spherical states.

Excited-state and ground-state intramolecular proton-transfer reactions of 6-(2-hydroxy-5-methylphenyl)-s-triazines in poly(methyl methacrylate)

1985 ◽  
Vol 89 (2) ◽  
pp. 320-326 ◽  
Author(s):  
Haruo Shizuka ◽  
Masanori Machii ◽  
Yasunori Higaki ◽  
Masanao Tanaka ◽  
Ikuzo Tanaka
Keyword(s):  
Excited State ◽  
Proton Transfer ◽  
Methyl Methacrylate ◽  
Ground State ◽  
Intramolecular Proton Transfer ◽  
Transfer Reactions ◽  
Poly Methyl Methacrylate ◽  
Proton Transfer Reactions

Ground-state and excited-state multiple proton transfer via a hydrogen-bonded water wire for 3-hydroxypyridine

2014 ◽  
Vol 38 (9) ◽  
pp. 4458-4464 ◽  
Author(s):  
Ye Wang ◽  
Hang Yin ◽  
Ying Shi ◽  
Mingxing Jin ◽  
Dajun Ding
Keyword(s):  
Excited State ◽  
Proton Transfer ◽  
Excited States ◽  
Ground State ◽  
Transfer Reactions ◽  
Proton Transfer Reactions ◽  
Hydrogen Bonded

The multiple proton transfer reactions of 3-hydroxypyridine-(H2O)3 have been demonstrated, and a perfect proton transfer cycle has been revealed in the ground and excited states.

scholarly journals Excited-State and Ground-State Proton-Transfer Reactions in 5-Aminoindole

1987 ◽  
Vol 60 (12) ◽  
pp. 4401-4407 ◽  
Author(s):  
Hemant Kumar Sinha ◽  
Sneh Kumar Dogra ◽  
Mannam Krishnamurthy
Keyword(s):  
Excited State ◽  
Proton Transfer ◽  
Ground State ◽  
Transfer Reactions ◽  
Proton Transfer Reactions

Nuclear Reaction Studies of 151Sm

1973 ◽  
Vol 51 (18) ◽  
pp. 2000-2022 ◽  
Author(s):  
D. E. Nelson ◽  
D. G. Burke ◽  
J. C. Waddington ◽  
W. B. Cook
Keyword(s):  
Cross Sections ◽  
Coulomb Excitation ◽  
Negative Parity ◽  
Angular Distributions ◽  
Neutron Transfer ◽  
Reaction Products ◽  
Single Neutron ◽  
Nilsson Model ◽  
Nuclear Levels ◽  
Photographic Emulsions

Properties of nuclear levels in 151Sm have been studied by measuring angular distributions for the 152Sm(d,t)151Sm reaction and spectra at several angles for the 152Sm(3He,α)151Sm and 150Sm(d,p)151Sm reactions. The reaction products were analyzed with a magnetic spectrograph and detected with photographic emulsions. Transfer l values were deduced from the (d,t) angular distributions and from the ratios of (3He,α) and (d,t) cross sections. The (d,t), (d,p), and (3He,α) reactions on targets of 151Sm were also studied in order to learn more about the wave function of the 151Sm ground state. The low-lying positive parity levels can be described by the Nilsson model with Coriolis and ΔN = 2 interactions included. However, the properties of the low energy negative parity states could not be explained as easily. No mixture of Nilsson states was found which could simultaneously explain the single neutron transfer intensities and the Coulomb excitation probabilities from previous measurements.

A Study of Levels in 149Nd using the (d, t) and (3He, α) Reactions

1973 ◽  
Vol 51 (4) ◽  
pp. 455-464 ◽  
Author(s):  
D. G. Burke ◽  
J. C. Waddington ◽  
D. E. Nelson ◽  
J. Buckley
Keyword(s):  
Cross Sections ◽  
Ground State ◽  
State Transition ◽  
Angular Distributions ◽  
Ground State Transition ◽  
Reaction Products ◽  
Q Value ◽  
Nilsson Model ◽  
Photographic Emulsions ◽  
Peak Widths

Triton spectra from the 150Nd(d, t)149Nd reaction have been measured at 15 angles using beams of 12 MeV deuterons. The 150Nd(3He, α)149Nd reaction was studied at four angles with 24 MeV 3He beams. In all cases the reaction products were analyzed with an Enge-type magnetic spectrograph and detected with photographic emulsions. The peak widths (FWHM) were approximately 8 keV for the (d, t) studies and 25 keV for the (3He, α) spectra. It is now evident that the highest energy triton group ascribed to the 150Nd(d, t)149Nd reaction in previous works does not correspond to the ground state transition. According to the current interpretation the ground state transition has a Q value of −1.122 ± 0.010 MeV. The (d, t) angular distributions and the ratios of (3He, α) and (d, t) cross sections at selected angles were used to determine l values for a number of the transitions. Three states in 149Nd at 481, 813, and 986 keV are definitely populated by l = 0 transitions and thus have Iπ = 1/2+. A strongly perturbed band consisting of a mixture of Nilsson states from the i13/2 shell has been found, with properties similar to the corresponding bands in the isotones 151Sm and 153Gd. The total observed intensity for each of the l values 0, 1, 2, and 6 cannot be explained by the extreme single-particle shell model but is consistent with that predicted by the Nilsson model. However, the splitting of the strength among the observed states cannot be explained by the basic Nilsson model.

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