New 0+ states in 146Sm from a (p,t) experiment and the particle-core coupling model |
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| Affiliation: | 1. Division of Interdisciplinary Research and Practice, School of Health and Social Care, University of Essex, Colchester CO4 3SQ, United Kingdom;2. Department of Gerontology and Geriatrics, Africa Centre for Epidemiology, P. O. Box AN 16284, Accra North, Accra Ghana;3. School of Sport, Rehabilitation and Exercise Sciences, University of Essex, Essex, Colchester CO4 3SQ, United Kingdom;4. College of Nursing, Midwiferyand Healthcare, University of West London, Paragon House, Boston Manor Road, Brentford TW8 9GB, United Kingdom;5. Department of Gerontology and Geriatrics, African Health and Ageing Research Centre (AHaARC), Winneba, Central Region, Ghana |
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| Abstract: | The reaction 148Sm(p,t)146Sm was studied at Ep = 26 MeV. Fifty-six excited states in the final N = 84 nucleus were observed below Eexc = 4.2 MeV and their angular distributions were measured at 8 angles. Spin and parity assignments are made for 37 of them, based on the determination of the transferred angular momentum L. Ten excited Jπ = 0+ states were identified. The emerging excitation energies of the Jπ = 0+ states and the monopole strength distribution in 146Sm are compared with those observed in nearby nuclei and with results of calculations done in the framework of the Particle-Core Coupling Model. The main features of the experimental results are interpreted using a superposition of two types of configurations: two-particle states coupled to the collective excitations of the N = 82 core and two holes coupled to the collective excitations of the N = 86 core. Calculations show also that two-phonon⊗two-particle configurations are spread over many states and their identification becomes difficult. |
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