Ebook: Neutron Capture Gamma-Ray Spectroscopy

The post World War II era witnessed a tremendous growth in the research carried out in neutron-induced reactions and especially in neutron capture y-ray studies. This growth was stimulated by the availability of neutron sources, such as reactors and accelerators, and by the development of high resolution y-ray and conversion electron detectors. Today the combination of high flux reactors and precise instrumentation has produced spectral data of exceptional quality, as the pages of these proceedings illustrate. The world-wide community of the practioners of the art of cap­ ture y-ray spectroscopy has met three times in the last decade: the first international symposium on this subject was held at Studsvik, Sweden in 1969, and the second at Petten, The Netherlands in 1974. A smaller meeting, of mostly u. S. and some European parti­ cipation, was held at Argonne National Laboratory in 1966. A perusal of the proceedings of these meetings shows the striking ad­ vances in this now mature field of physics over the last dozen years. Each meeting has seen a small but perceptible increase in the number of papers presented and the number of laboratories repre­ sented. More importantly, each meeting has documented the increasing impact of (n,y) reasearch, not only on other areas of basic physics, but also on commercial and medical applications of this technology. A total of 29 invited papers and 97 contributed papers were presented at this symposium.

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Content:
Front Matter....Pages i-xix
Some Recent Developments in Nuclear Models....Pages 1-21
The Interacting Boson Model....Pages 23-35
Investigating Nuclear Structure with the (n,?) Reaction....Pages 37-58
Experimental Tests of Recent Nuclear Models with the (n,?) Reaction....Pages 59-83
The Complementarity Between Neutron Capture and Heavy-Ion Reactions in Nuclear Structure Studies....Pages 85-103
Resonance-Averaged (n,?) Spectra and their Applications to Nuclear Structure....Pages 105-123
High Precision (n,e?) Spectroscopy....Pages 125-143
Few-Quasiparticle Components of Nuclear States at High Excitation Energies....Pages 145-160
Photon Strength Functions....Pages 161-180
Distribution of Radiative Strength with Excitation Energy: The E1 And M1 Giant Resonances....Pages 181-191
Localized Dipole and Quadrupole Radiation Strengths in 208Pb....Pages 193-220
Locating Giant Resonances with Photoneutrons....Pages 221-243
N-P Capture and the Photo-Disintegration of the Deuteron....Pages 245-263
Nonstatistical Effects in Neutron Capture, A Review of Recent Experiments....Pages 265-283
Doorway Structures in the Radiative Capture of Fast Neutrons....Pages 285-298
Fast Neutron Capture Gamma Rays....Pages 299-317
Direct and Resonance Capture Reactions with Nucleons and Composite Particles....Pages 319-335
Exotic Atoms and Nuclear Structure....Pages 337-352
Tests of Quantum Electrodynamics with Neutron Capture Gamma-Rays....Pages 353-369
Searches for Parity Violation....Pages 371-383
Polarized Beams....Pages 385-400
Photon Scattering Studies with N-Capture ?-Rays....Pages 401-425
Precise ?-Ray Energy Standards....Pages 427-440
Practical Applications of Neutron Capture Gamma Rays....Pages 441-459
Application of the Thermal (n,?) Reaction to Elemental Analysis....Pages 461-474
Resonance Capture Reactions with a Total Energy Detector....Pages 475-484
New Instruments and Techniques in Neutron Capture Studies....Pages 485-502
High Intensity Neutron Sources....Pages 503-519
Front Matter....Pages 521-521
Experiments and Results at the Ultra-Cold Neutron Source at the Ill, Grenoble....Pages 523-525
Analysis of the ?-Particle Spectra from the 143Nd(nth,??)140Ce and 123Te(nth,??)120Sn Reactions....Pages 526-528
Partial ?-Decay Widths of the Thermal Neutron Capture States in 144Nd and 124Te....Pages 529-531
Neutron Capture Mechanism in the 3s Size Resonance - I....Pages 532-534
Neutron Capture Mechanisms in the 3s Size Resonance - II....Pages 535-537
Non-Statistical Neutron Capture Mechanisms in 139La and 141Pr....Pages 538-540
Search of an Electric Dipole Moment by Means of Ultra-Cold Neutrons....Pages 541-545
Neutron-Capture Prompt Gamma-Ray Activation Analysis: Multi-Element Measurements on Various Materials....Pages 546-548
A Systematic Search for and Study of (nth, ??) and (nth, ?p) Reactions....Pages 549-551
Precision Measurements of X-Ray Energies, Natural Widths and Intensities in the Actinide Region....Pages 552-554
Shape of the E1 Strength Function in the Region of Pygmy Anomaly Due to Non Statistical Background Coupling....Pages 555-557
Gamma Spectra from 233U, 235U, and 239Pu During Thermal Neutron Irradiation....Pages 558-560
Front Matter....Pages 521-521
Study of the Energy Levels of 196Au Using the (?,n) Reaction....Pages 561-563
Photoexcitation of the 7632 keV Level in 207Pb....Pages 564-566
Study of Low-Lying States in 110Ag Following 109Ag(n,?) Reaction....Pages 567-570
The 115Sn(n,?) Reaction With Thermal Neutrons....Pages 571-572
Systematics of Fragmentation of Nilsson Strength Near A=190....Pages 573-575
Test of Microscopic Isovector Optical Potential in Capture and Scattering of Fast Neutrons on 208Pb....Pages 576-578
Negative-Parity States in 196Pt....Pages 579-581
A Simple Empirical Method for Determining the Energy Gap in Non-Spherical Even-Even Nuclei....Pages 582-584
Low-Lying Levels of 236U from Investigation of the K? = 4? Two-Quasineutron Isomer in (n,?) and (n,e) Experiments....Pages 585-587
Low Energy ? Rays from Resonance Neutron Capture in 191Ir....Pages 588-590
On Parity Violation in Compound Nuclei....Pages 591-593
States of High Intrinsic Excitation in 168Er Observed through Thermal Neutron Capture....Pages 594-596
Polarized Neutron Capture in Aluminium....Pages 597-599
Direct-Semidirect and Pure-Resonance Model Calculations of Fast Neutron Capture on 208Pb....Pages 600-602
E.M. Isotope Separation and In-Beam Electron Spectroscopy....Pages 603-605
Equipment Designs for Neutron Capture Gamma Experiments with 252Cf....Pages 606-608
Upper Limit for the 1H(n,??)2H Cross Section....Pages 609-611
Gamma-Ray Strength Functions for Medium Weight Nuclei....Pages 612-614
A ‘Super-Thermal’ Source for Ultra-Cold Neutrons....Pages 615-617
The 1H(n,?) Reaction Gamma-Ray Energy: Revised Neutron Binding Energies for 3T, 13C, 14C and 15N....Pages 618-620
Front Matter....Pages 521-521
Gamma-Ray Energies from the 14N(n,?) Reaction....Pages 621-623
The Role of Neutron-Capture Gamma-Rays in Element Analysis....Pages 624-625
Excited Levels in 249Cm from Neutron Capture ?-Ray Measurements....Pages 626-628
The 17O(?,no)16O Reaction and the Lane-Lynn Theory of Radiative Capture....Pages 629-631
Parity Assignments from High Resolution Neutron Scattering and M1 Radiative Strength in 208Pb....Pages 632-633
An On-Line Angular Correlation System at the Institut Laue-Langevin ; Multipole Mixing in the Gamma to Ground Bands of 164Dy....Pages 634-636
Gamma-Ray Strength Functions in 170Tm and 198Au....Pages 637-639
Gamma-Decay of P3/2 Neutron Resonances in 28Si....Pages 640-642
Rayleigh Scattering of N-Capture ? Rays....Pages 643-645
Capture of 2 and 24 keV Neutrons by the Zirconium Isotopes....Pages 646-648
Gamma Rays from the 5.9 keV Resonance in 27Al....Pages 649-651
Study of Nuclear Levels in 238Np by Reaction Spectroscopy....Pages 652-654
Analysis of Fluctuations of Low-Lying State Populations in Radiation Neutron Capture....Pages 655-658
Calculation of Neutron Capture Gamma-Ray Spectra....Pages 659-661
The Average E1/M1 Strength Ratio for A < 100....Pages 662-664
Spin Assignments of 198Au Levels Based on Angular Distribution and Circular Polarization Measurements in the 197Au(n,?) Reaction....Pages 665-668
Absolute Intensities of Radiative Deexcitation of 46Sc....Pages 669-671
New External Thermal Facility at NRU and 17O(n,?)18O Reaction Studies....Pages 672-674
Front Matter....Pages 675-677
On-Line Neutron Capture Gamma Analysis with a GE Detector....Pages 678-680
Conversion Electrons and Multipolarities of Transitions in 108Ag....Pages 521-521
A Survey of Photon Strengths from A=20 to 240....Pages 681-683
Doorway Structures in the Radiative Capture of Fast Neutrons....Pages 684-686
Selection of Optimum Neutron Source Size for Neutron Capture Gamma Ray Borehole Analysis....Pages 687-689
Experimental Demonstration of Phase Relation for Common Doorway States....Pages 690-692
Enhanced Primary M1 Transitions in 207Pb....Pages 693-695
The Angular Distribution of the Polarization of Ground State Photoneutrons from 16O....Pages 696-698
Evidence for Neutron Capture through Doorway States in 29Si....Pages 699-700
16.3 eV Neutron Capture in 107Ag: Nuclear Structure of 108Ag....Pages 701-703
Fuel Material Analysis Using Radioactive Thermal Neutron Capture....Pages 704-706
Anomalous M-1 Strengths and Doorway States in Neutron Capture....Pages 707-709
M1-Giant Resonance and Radiative Strength Functions in 126Te....Pages 710-713
Low-Lying Levels in 154Eu from Thermal Neutron Capture....Pages 714-716
The 59Ni(n,?) Reaction with Thermal Neutrons....Pages 717-719
Evidence for an E2 Resonance Observed by Radiative Capture of Fast Neutrons by 40Ca....Pages 720-721
Statistical Model Calculation of the Total Radiative Width and the Degree of Freedom in the Capture Process....Pages 722-724
Measurement of Thermal Neutron Capture Gamma-Rays Using a Neutron Guide Tube....Pages 725-727
Front Matter....Pages 728-730
Collective M1 Excitation Effects on Photon Angular Distributions from the 140Ce(n,?o) Reaction....Pages 731-733
Gamma-Gamma Angular Correlation Measurements on 142Ba....Pages 734-736
Use of Nuclear Photon Scattering for Studying the Vibrational Energy of 15N in BN and NH4Cl....Pages 737-740
Delayed Coincidence Measurement of 152Eu 89.8488 keV Isomeric State Feeding....Pages 521-521
Evaluation of the Capture Cross Section of 169Tm from 10?5 Ev to 2.107 eV....Pages 741-743
Low-Spin Odd Parity States in 109Pd and Rotation-Aligned Models....Pages 744-747
In Situ Capture Gamma Analysis of Large Mineral Samples....Pages 748-750
Neutron Capture Gamma-Ray Study at Tehran Nuclear Research Center....Pages 751-753
Investigation of 153Gd and of other Gadolinium Isotopes....Pages 754-756
Focussed 24 KeV Filtered Neutron Beam....Pages 757-759
Levels in 155GD Populated by Thermal Neutron Capture....Pages 760-761
Low-Energy ?-Ray Transitions Between Compound States....Pages 762-762
Neutron Capture Cross Sections in 66Zn and 68Zn....Pages 763-766
Nuclear Information to the Study of the Electron Configuration of the 4+ Uranium Ion....Pages 767-768
Low-Energy Level Structure of 151Sm by the 150Sm(n,?)151Sm Reaction....Pages 769-771
Medical Application of Neutron Capture ?-Ray Spectroscopy: Measurement of Cadmium and Nitrogen in Living Human Subjects....Pages 772-775
Vibrational Versus Rotational Descriptions of 193Au....Pages 776-778
Correlations Between (n,?) and (d,p) Strengths on 144Sm....Pages 779-781
The Level Structure of 193Os....Pages 782-784
Capture ?-Rays and Reaction Mechanism in 100Mo + N....Pages 785-787
Front Matter....Pages 788-790
Correlation of the Primary Gamma-Ray Intensities Following s- And p-Wave Neutron Capture in 58Fe....Pages 791-793
Excited Levels in 231Th from Neutron Capture ?-Ray Measurements....Pages 794-796
Nuclear Deformation Potential Energy of Odd Tl,Au,Ir and Re Isotones....Pages 797-799
Measurement of ?n/?f from Photofission of 238U with Neutron Capture ? Rays....Pages 521-521
Fractional Independent Yield of 134I from Photofission of 238U with Neutron Capture ? Rays....Pages 800-801
Concluding Remarks....Pages 802-804
Introduction of After Dinner Speaker....Pages 805-807
Personal Reminiscences from the Cavendish in the Thirties....Pages 808-810
Back Matter....Pages 811-813
....Pages 815-832