96Tc levels populated in the (α,n) reaction

1988 ◽  
Vol 66 (1) ◽  
pp. 62-78 ◽  
Author(s):  
H. A. Mach ◽  
M. W. Johns
Keyword(s):  
Gamma Ray ◽  
Energy Levels ◽  
Angular Distributions ◽  
Internal Conversion Coefficients ◽  
Microscopic Models ◽  
New Energy ◽  
Conversion Coefficients ◽  
Degree Of Confidence ◽  
High Degree ◽  
Vibrational Features

The levels of odd–odd 96Tc have been investigated using the 93Nb(α,nγ)96Tc reaction at an alpha-beam energy of 14 MeV. The experiments involved singles, gamma–gamma coincidences, detailed excitation functions, gamma-ray angular distributions, measurements of the gamma-ray linear polarization coefficients, and electron internal-conversion coefficients. Spin and parity assignments are given with a high degree of confidence to most of the 105 energy levels, which are interconnected by 251 gamma-ray transitions. In particular, a new energy level at 36.24 keV completes a sextet of lowest lying levels ranging in spin from 2+ to 7+ formed by a coupling of an odd g9/2 proton to an odd d5/2 neutron. The structure of 96Tc shows some vibrational features coexisting with a significant configuration mixing. Thus, a quartet of nuclei at the onset of a deformation region at A ~ 100, 94,95Mo and 95,96Tc, provides a challenging ground for testing of the microscopic models and may give further insight into the nature of the neutron–proton interaction in complex nuclei.

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.

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.

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.

(n,n′γ) studies of 114,116Cd

1980 ◽  
Vol 58 (1) ◽  
pp. 8-15 ◽  
Author(s):  
T. M. Newton ◽  
J. M. Davidson ◽  
W. K. Dawson ◽  
P. W. Green ◽  
H. R. Hooper ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Energy Levels ◽  
Angular Distributions ◽  
Mixing Ratios

Energy levels below 2.2 MeV excitation in 114,116Cd have been investigated using the (n, n′γ) reaction. Gamma-ray angular distributions were measured, and energy levels, spins, and gamma-ray multipole mixing ratios were deduced. Levels and their spins have been confirmed at 1134 (0), 1210 (2), 1283 (4), 1365 (2), 1733 (4), and 1843 (2) keV for 14Cd and at 1213 (2), 1220 (4), and 1381 (0) keV for 116Cd. New spin assignments have been made for the levels at 1861 (3) and 2049 (3) keV for 114Cd and at 1644 (2,3) and 1917 (3) keV for 116Cd. The states at 1959 keV in 114Cd and 1923 keV in 116Cd are shown to be consistent with assignments of 3.

scholarly journals A New Energy Level in 20Ne at 10·31 MeV

1964 ◽  
Vol 17 (1) ◽  
pp. 56 ◽  
Author(s):  
DG Sargood ◽  
GD Putt
Keyword(s):  
Energy Level ◽  
Neutron Energy ◽  
Gamma Ray ◽  
Angular Distributions ◽  
New Energy ◽  
State Spin ◽  
Gamma Decay ◽  
Coincidence Measurements ◽  
Made In

Neutron-gamma-ray coincidence measurements have been made in the reaction 19F(d,ny),oNe at bombarding energies between 500 and 700 keV. Time offlight determination of neutron energy indicates a new energy level in .oNe at lO� 31 �O' 07 MeV. From angular distributions of the neutrons, and observation of the gamma -decay spectrum of the 10.31 MeV state, spin and parity of 1 + are inferred for this state.

Study of the 48Ti(α,p)51V and 50Ti(3He,d)51V Reactions

1971 ◽  
Vol 49 (8) ◽  
pp. 1053-1065 ◽  
Author(s):  
P. N. Maheshwari ◽  
U. C. Gupta ◽  
C. St-Pierre
Keyword(s):  
Optical Model ◽  
Energy Levels ◽  
Angular Distributions ◽  
Model Parameters ◽  
Model Calculations ◽  
Angular Momenta ◽  
Rotator Model ◽  
Spectroscopic Factors ◽  
New Energy ◽  
Bombarding Energy

The reactions 48Ti(α,p)51V at ten bombarding energies between 8.25 and 10.75 MeV and 50Ti(3He,d)51V at 10 MeV bombarding energy have been studied. Energy levels of 51V up to 4.85 and 6.17 MeV have been observed by (α,p) and (3He,d) reactions respectively. The (α,p) reaction yielded many new energy levels. The angular distributions for deuterons were measured at lab angles between 15° and 120°, and compared with predictions of DWBA calculations using the TSALLY code from which the transferred angular momenta and spectroscopic factors were deduced. These experimental results are examined from the viewpoint of shell model and strong coupling rotator model calculations. The effect of changing various optical model parameters is also discussed.

High-resolution gamma-ray study of 185Wm

1970 ◽  
Vol 48 (5) ◽  
pp. 502-510 ◽  
Author(s):  
S. C. Gujrathi ◽  
J. M. D'auria
Keyword(s):  
High Resolution ◽  
Gamma Rays ◽  
Ground State ◽  
Internal Conversion ◽  
Gamma Ray ◽  
X Ray ◽  
Isomeric Level ◽  
Coincidence System ◽  
Internal Conversion Coefficients ◽  
Conversion Coefficients

The decay of 185Wm has been investigated using a high-resolution Ge(Li) X-ray spectrometer and a Ge(Li)–NaI(Tl) coincidence system. The energies and relative intensities (given in parentheses) of the observed gamma rays associated with the decay of the 185Wm (T1,2 = 1.68 min) are: 23.54 (3.3), 42.29 (1.1), 65.857 (100), 93.30 (0.5), 94.59 (2.2), 107.850 (6.8), 122.05 (1.5), 131.554 (84.0), 164.334 (11), 173.675(61.5),and 187.879(15.4) keV. The energy of the isomeric level has been deduced to be 197.41 keV and decays to the ground state through levels at 187.88, 173.68, 93.29, 65.86, and 23.54 keV. In addition, it was deduced experimentally from measured internal-conversion coefficients that the multipolarity of the 131.55 keV transition is E3 while the 65.86 keV transition is an M1 + E2 mixture with a 30 ± 7.5% M1 component.

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