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Title: Measurement of conversion electrons with the {sup 208}Pb(p,n){sup 208}Bi reaction and derivation of the shell model proton neutron hole interaction from the properties of {sup 208}Bi

Abstract

Conversion electrons from {sup 208}Bi have been measured using singles and coincidence techniques with the {sup 208}Pb(p,n){sup 208}Bi reaction at 9 MeV. The new information on multipolarities and spins complements that available from recent {gamma}-{gamma}-coincidence studies with the same reaction [Boutachkov et al., Nucl. Phys. A768, 22 (2006)]. The results on electromagnetic decays taken together with information on spectroscopic factors from earlier single-particle transfer reaction measurements represent an extensive data set on the properties of the one-proton one-neutron-hole states below 3 MeV, a spectrum which is virtually complete. Comparison of the experimental observables, namely, energies, spectroscopic factors, and {gamma}-branching ratios, with those calculated within the shell model allows extraction of the matrix elements of the shell model residual interaction. More than 100 diagonal and nondiagonal elements can be determined in this way, through a least squares fit to the experimental data. This adjustment of the interaction significantly affects the calculated properties of the {gamma}-ray transitions. Nevertheless, the matrix elements thus obtained are remarkably similar to those of a realistic interaction calculated from free-nucleon scattering. Characteristic features of the interaction are discussed.

Authors:
 [1]; ; ; ; ; ;  [2]; ;  [3];  [2];  [4]
  1. Niewodniczanski Institute of Nuclear Physics, PAN, Krakow (Poland)
  2. Department of Nuclear Physics, Research School of Physical Sciences and Engineering, Australian National University, Canberra ACT 0200 (Australia)
  3. Physics Department, University of Notre Dame, Notre Dame, Indiana 46556 (United States)
  4. Ecole Nationale Superieure d'Ingenieurs de Caen, F-14050 Caen Cedex (France)
Publication Date:
OSTI Identifier:
21067961
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 76; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevC.76.064304; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BISMUTH 208; BRANCHING RATIO; COINCIDENCE SPECTROMETRY; COMPARATIVE EVALUATIONS; ELECTRONS; GAMMA SPECTROSCOPY; LEAD 208; LEAST SQUARE FIT; MATRIX ELEMENTS; MEV RANGE; MULTIPOLARITY; NEUTRONS; NUCLEAR DECAY; PARTICLE-HOLE MODEL; PROTONS; RESIDUAL INTERACTIONS; SHELL MODELS; SPECTROSCOPIC FACTORS; SPIN; TRANSFER REACTIONS

Citation Formats

Maier, K H, Department of Nuclear Physics, Research School of Physical Sciences and Engineering, Australian National University, Canberra ACT 0200, SUPA, School of Engineering and Science, University of Paisley, Paisley PA1 2BE, Kibedi, T, Dracoulis, G D, Davidson, P M, Lane, G J, Nieminen, P, Watanabe, H, Boutachkov, P, Aprahamian, A, Byrne, A P, Department of Physics, The Faculties, Australian National University, Canberra ACT 0200, Marie-Jeanne, M, and CERN, PH-IS Division, CH-1211 Geneva 23. Measurement of conversion electrons with the {sup 208}Pb(p,n){sup 208}Bi reaction and derivation of the shell model proton neutron hole interaction from the properties of {sup 208}Bi. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.76.064304.
Maier, K H, Department of Nuclear Physics, Research School of Physical Sciences and Engineering, Australian National University, Canberra ACT 0200, SUPA, School of Engineering and Science, University of Paisley, Paisley PA1 2BE, Kibedi, T, Dracoulis, G D, Davidson, P M, Lane, G J, Nieminen, P, Watanabe, H, Boutachkov, P, Aprahamian, A, Byrne, A P, Department of Physics, The Faculties, Australian National University, Canberra ACT 0200, Marie-Jeanne, M, & CERN, PH-IS Division, CH-1211 Geneva 23. Measurement of conversion electrons with the {sup 208}Pb(p,n){sup 208}Bi reaction and derivation of the shell model proton neutron hole interaction from the properties of {sup 208}Bi. United States. doi:10.1103/PHYSREVC.76.064304.
Maier, K H, Department of Nuclear Physics, Research School of Physical Sciences and Engineering, Australian National University, Canberra ACT 0200, SUPA, School of Engineering and Science, University of Paisley, Paisley PA1 2BE, Kibedi, T, Dracoulis, G D, Davidson, P M, Lane, G J, Nieminen, P, Watanabe, H, Boutachkov, P, Aprahamian, A, Byrne, A P, Department of Physics, The Faculties, Australian National University, Canberra ACT 0200, Marie-Jeanne, M, and CERN, PH-IS Division, CH-1211 Geneva 23. Sat . "Measurement of conversion electrons with the {sup 208}Pb(p,n){sup 208}Bi reaction and derivation of the shell model proton neutron hole interaction from the properties of {sup 208}Bi". United States. doi:10.1103/PHYSREVC.76.064304.
@article{osti_21067961,
title = {Measurement of conversion electrons with the {sup 208}Pb(p,n){sup 208}Bi reaction and derivation of the shell model proton neutron hole interaction from the properties of {sup 208}Bi},
author = {Maier, K H and Department of Nuclear Physics, Research School of Physical Sciences and Engineering, Australian National University, Canberra ACT 0200 and SUPA, School of Engineering and Science, University of Paisley, Paisley PA1 2BE and Kibedi, T and Dracoulis, G D and Davidson, P M and Lane, G J and Nieminen, P and Watanabe, H and Boutachkov, P and Aprahamian, A and Byrne, A P and Department of Physics, The Faculties, Australian National University, Canberra ACT 0200 and Marie-Jeanne, M and CERN, PH-IS Division, CH-1211 Geneva 23},
abstractNote = {Conversion electrons from {sup 208}Bi have been measured using singles and coincidence techniques with the {sup 208}Pb(p,n){sup 208}Bi reaction at 9 MeV. The new information on multipolarities and spins complements that available from recent {gamma}-{gamma}-coincidence studies with the same reaction [Boutachkov et al., Nucl. Phys. A768, 22 (2006)]. The results on electromagnetic decays taken together with information on spectroscopic factors from earlier single-particle transfer reaction measurements represent an extensive data set on the properties of the one-proton one-neutron-hole states below 3 MeV, a spectrum which is virtually complete. Comparison of the experimental observables, namely, energies, spectroscopic factors, and {gamma}-branching ratios, with those calculated within the shell model allows extraction of the matrix elements of the shell model residual interaction. More than 100 diagonal and nondiagonal elements can be determined in this way, through a least squares fit to the experimental data. This adjustment of the interaction significantly affects the calculated properties of the {gamma}-ray transitions. Nevertheless, the matrix elements thus obtained are remarkably similar to those of a realistic interaction calculated from free-nucleon scattering. Characteristic features of the interaction are discussed.},
doi = {10.1103/PHYSREVC.76.064304},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 6,
volume = 76,
place = {United States},
year = {2007},
month = {12}
}