Levels in 148Tb excited by the (6,7Li,xn) and (10B,xn) reactions

1979 ◽  
Vol 57 (3) ◽  
pp. 358-367 ◽  
Author(s):  
N. C. Singhal ◽  
M. W. Johns
Keyword(s):  
High Spin ◽  
Internal Conversion ◽  
Gamma Ray ◽  
Angular Distributions ◽  
Spin States ◽  
High Spin States ◽  
Internal Conversion Coefficients ◽  
Conversion Coefficients ◽  
Γ Ray ◽  
Coincidence Measurements

High spin slates in 148Tb have been excited by means of 144Sm(6Li,2n), 144Sm(7Li,3n), and 142Nd(10B,4n) reactions and studied by γ-ray and electron measurements. Gamma-ray singles, excitation functions, angular distributions, internal conversion coefficients, and γ–γ coincidence measurements have been made. A seven-fold gamma–gamma cascade feeding the 9+ isomeric state in 148Tb and originating in a level 4137 keV above that state is strongly excited. The spin and parity assignments are made on the basis of angular distribution and internal conversion coefficients. On the basis of these measurements, the 1006 keV transition is E3 in character; the half-life of the 1006 keV (12−) level is established to be 25 ± 2 ns.These experiments also confirm the existence of a number of high spin states in 148Gd seen by earlier workers.

High spin states in 96Tc populated through the (α,n) reaction

1980 ◽  
Vol 58 (2) ◽  
pp. 174-190 ◽  
Author(s):  
H. A. Mach ◽  
M. W. Johns ◽  
J. V. Thompson
Keyword(s):  
Theoretical Model ◽  
High Spin ◽  
Spin Structure ◽  
Gamma Ray ◽  
Angular Distributions ◽  
Spin States ◽  
High Spin States ◽  
Gamma Coincidence ◽  
Electron Conversion ◽  
Conversion Coefficients

High spin states of 96Tc populated by the (α,n) reaction using alpha beams from 13 to 27 MeV have been studied. Gamma-ray energies and intensities, gamma–gamma coincidence probabilities, gamma-ray angular distributions, and electron conversion coefficients were determined at 18 MeV. In addition, some results taken at 14 MeV are reported.The high spin structure observed in this work includes the following levels: 49.3(6+), 318.8(6+), 574.7(7+), 926.9(9+), 946.5(8+), 1062.1(8+), 1138.8(8+), 1447.2(9+), 1702.8(10+), 1861.6(9+), 1922.3(11+), 2147.5(11+), 2213.5(10(+)), 2317.2(12+), 2396.8(11(+)), 2599.0((13)+), 2642.4((14)+), and 3020.1(12(+)).These experiments also clarify and extend the information obtained by previous workers. In particular, evidence is adduced for low-lying states at 0.0(7+), 34.3(4+), 45.3(5+), 120.3(3−), 177.0(5+), 226.2(2−), 227.0(4+), and 254.3(3+).The work identifies many other states of intermediate energy.Attenuation coefficients for states in 96Tc are calculated using a theoretical model.

A study of high spin states in 151Gd

1977 ◽  
Vol 55 (7-8) ◽  
pp. 690-713 ◽  
Author(s):  
H. J. Smith ◽  
M. W. Johns ◽  
G. Løvhøiden ◽  
J. V. Thompson ◽  
J. C. Waddington ◽  
...  
Keyword(s):  
Band Structure ◽  
Rotational Band ◽  
Gamma Ray ◽  
Level Structure ◽  
Negative Parity ◽  
Angular Distributions ◽  
Spin States ◽  
High Spin States ◽  
Conversion Coefficients ◽  
Coincidence Measurements

States in the transitional nucleus, 151Gd, excited by the (α,2n) reaction have been studied by gamma-ray and conversion electron measurements. Gamma-ray energies, intensities, excitation functions, and γ–γ coincidence measurements were used to establish the levels populated. Angular distributions involving measurements at seven angles from 0° to 90° and K-conversion coefficients have been used to make spin and parity assignments.The El character of the 65, 79, 340, 358, 406, and 462 keV transitions, which in the absence of K-conversion data had been tacitly assumed to be M1 by earlier workers leads to a significant revision of their parity assignments and interpretation of the level structure. The negative parity states at 1210, 1463, 1726, 2004, 2295, 2600, 2915, and 3237 keV form a well-developed rotational band based on the 11/2− [505] state at 1210 keV. The properties of this band in this nucleus are compared with those of the same band in a number of nearby nuclei. Two non-interacting negative parity bands with states at 0(7/2−), 706(11/2−), 1435(15/2−), 2078(19/2−), and 379(9/2−), 902(13/2−), 1511(17/2−), 2297(21/2−), respectively, have been found, as well as a number of other negative parity states of spin 7/2, 9/2, and 13/2. A complex positive band structure involving states at 784(11/2+), 852(13/2+), 1116(13/2+), 1346(17/2+), 1364(15/2+), 1677(17/2+), 1851(19/2+), 1853(21/2+), 2197(21/2+), 2325(23/2+), and 2405(25/2+) has been identified. By using a somewhat unusual set of parameters, we have been able to approach a description for the positive parity states in terms of the triaxial model of Meyer-ter-Vehn.

The high spin states in 147Tb excited by the (6Li,3n) reaction

1980 ◽  
Vol 58 (11) ◽  
pp. 1617-1624 ◽  
Author(s):  
Tasneem A. Khan ◽  
M. W. Johns
Keyword(s):  
Angular Distribution ◽  
High Spin ◽  
Linear Polarization ◽  
Level Scheme ◽  
Internal Conversion ◽  
Gamma Ray ◽  
Spin States ◽  
Excitation Functions ◽  
High Spin States ◽  
Γ Ray

High spin states in 147Tb have been excited by means of the 144Sm(6Li,3n) reaction and studied by means of γ-ray and electron measurements. Gamma-ray singles, excitation functions, angular distribution, linear polarization, γ–γ coincidence, and internal conversion measurements have been made. These have led to unambiguous spin and parity assignments to many levels and to lifetime determinations for two states. The resulting level scheme is discussed and compared with recent calculations.

A Kπ = 0− Octupole Band in 150Sm

1975 ◽  
Vol 53 (13) ◽  
pp. 1229-1235 ◽  
Author(s):  
J. V. Thompson ◽  
M. W. Johns ◽  
J. C. Waddington
Keyword(s):  
High Spin ◽  
Conversion Electron ◽  
Gamma Ray ◽  
Angular Distributions ◽  
Spin States ◽  
High Spin States ◽  
Gamma Coincidence

A study of the 148Nd(α, 2n)150Sm reaction has revealed the high spin states of a Kπ = 0− octupole band, the members of which become the yrast levels above spin 12. Gamma ray angular distributions, gamma–gamma coincidence, and conversion electron studies have established the levels of the octupole band at 1764.6(7−), 2232.1(9−), 2744.0(11−), and tentatively at 3293.0(13−) keV.

Band structures in 95Tc

1978 ◽  
Vol 56 (1) ◽  
pp. 117-126 ◽  
Author(s):  
K. A. Marshall ◽  
J. V. Thompson ◽  
W. B. Cook ◽  
M. W. Johns
Keyword(s):  
Angular Distribution ◽  
Internal Conversion ◽  
Gamma Ray ◽  
Distribution Functions ◽  
Angular Distributions ◽  
High Momentum ◽  
Internal Conversion Coefficients ◽  
Conversion Coefficients ◽  
Proton Induced Reaction ◽  
Induced Reaction

The (α,2nγ) reaction has been used to study high momentum states in 95Tc. Gamma ray singles excitation functions, angular distribution functions, γ–γ coincidence probabilities, and internal conversion coefficients were determined for a large number of transitions. In addition to a number of low spin levels that are strongly populated in proton induced reaction, the alpha induced reaction populates a positive parity sequence levels at 882 (13/2), 857 (11/2), 1516 (17/2), 1550 (15/2), 2184 (19/2), 2548 (21/2), 2908 (23/2), 3517 (25/2), 3919 (29/2), and 4293 (27/2) keV together with a negative sequence of levels at 39 (1/2), 668 (5/2), 1214 (9/2), 1702 (13/2), 2213 (17/2), 3024 (21/2), 3822 (25/2), 4128 (27/2, 29/2), and 4972 (29/2). The spins are assigned on the basis of internal conversion measurements and angular distributions.

Levels populated in 193Ir from the beta decay of 193Os

1969 ◽  
Vol 47 (7) ◽  
pp. 727-746 ◽  
Author(s):  
R. H. Price ◽  
M. W. Johns ◽  
N. M. Ahmed ◽  
E. E. Habib
Keyword(s):  
Beta Decay ◽  
Internal Conversion ◽  
Gamma Ray ◽  
Magnetic Spectrometer ◽  
Mixing Ratios ◽  
Internal Conversion Coefficients ◽  
Conversion Coefficients ◽  
Coincidence Measurements

The beta and gamma ray transitions involved in the decay of 193Os have been studied using Ge(Li) and Nal(Tl) detectors and magnetic spectrometers, singly and in coincidence. Fifty-four gamma ray transitions have been observed and all but one classified on the basis of energy fit and β−γ and γ−γ coincidence measurements. The internal conversion coefficients of 25 of the stronger transitions were determined with a magnetic spectrometer operating at a resolution of ~0.1% in momentum, and multipole mixing ratios determined. The energies and spins of levels in 193Ir have been determined as follows: 0 (3/2+), 73.006 (1/2+), 138.887 (5/2+), 142.125 (+), 180.00(3/2+), 357.7 (7/2+), 361.79 (5/2+), 440.95 (+), 460.46 (3/2+), 557.29 (1/2+), 559.22 (5/2+), 660.09 (+), 667.13, 695.06 (3/2+), 712.08 (3/2+), 778.50,784.13, 848.94, 874.45, 891.57.

scholarly journals High Spin States in 193Hg

2020 ◽  
Vol 4 ◽  
pp. 170
Author(s):  
N. Fotiades ◽  
Et al.
Keyword(s):  
Excited States ◽  
High Spin ◽  
Normal Level ◽  
Beam Energy ◽  
Spin Structure ◽  
Spin States ◽  
Tandem Accelerator ◽  
High Spin States ◽  
Γ Rays ◽  
Γ Ray

The high-spin structure of 193Hg was investigated by in-beam γ-ray spectro­scopic techniques. The tandem accelerator at Daresbury Laboratory, U. K., was used to populate excited states of 193Hg through the reaction 150Nd(48Ca,5n)193Hg at a beam energy of 213 MeV and the EUROGAM detector array was used to de­ tect the γ-rays emitted by the deexciting nuclei. The normal level scheme has been further extended and a new band has been observed. In addition two new ΔI=1 structures of competing dipole and quadrupole transitions were found which will be discussed in detail.

TESSA : A multi-detector γ-ray array designed to study high spin states

1983 ◽  
Vol 409 ◽  
pp. 343-351 ◽  
Author(s):  
P.J. Twin ◽  
P.J. Nolan ◽  
R. Aryaeinejad ◽  
D.J.G. Love ◽  
A.H. Nelson ◽  
...  
Keyword(s):  
High Spin ◽  
Spin States ◽  
High Spin States ◽  
Γ Ray
Sign in / Sign up

Export Citation Format

Share Document