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

Journal Article · Sat Dec 15 00:00:00 EST 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.76.064304· OSTI ID:21067961

Maier, K H ^[1]; Kibedi, T; Dracoulis, G D; Davidson, P M; Lane, G J; Nieminen, P; Watanabe, H ^[2]; Boutachkov, P; Aprahamian, A ^[3]; Byrne, A P ^[2]; Marie-Jeanne, M ^[4]

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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)

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.

• OSTI ID: 21067961
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 76, Issue 6; Other Information: DOI: 10.1103/PhysRevC.76.064304; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

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