2{sub 1}{sup +}{yields}0{sub 1}{sup +} transition strengths in Sn nuclei

Journal Article · Wed Aug 15 04:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.76.021302· OSTI ID:21061925

Orce, J N; Choudry, S N; Crider, B; Elhami, E; Mukhopadhyay, S; Scheck, M; McEllistrem, M T ^[1]; Yates, S W ^[1]

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1. Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055 (United States)

The lifetime of the 2{sub 1}{sup +} state at 1256.7 keV in {sup 112}Sn has been determined using the (n,n{sup '}{gamma}) reaction. Angular distribution measurements were carried out at a neutron energy of 1.7 MeV, above the 2{sub 1}{sup +} energy threshold and below that of the second excited level. Through the Doppler-shift attenuation method, the lifetime of the 2{sub 1}{sup +} state is determined as 750{sub -90}{sup +125} fs, which gives a B(E2;2{sub 1}{sup +}{yields}0{sub 1}{sup +}) value of 10.9{sub -1.6}{sup +1.5} W.u. This E2 strength in {sup 112}Sn also allows a redetermination of the B(E2;2{sub 1}{sup +}{yields}0{sub 1}{sup +}) in {sup 108}Sn as 10.8(3.0) W.u. These values result in a symmetric trend around the neutron midshell in the systematics of E2 strengths in the even-mass tin isotopes and do not support N=64 or N=66 subshell gaps. The symmetric trend is in agreement with recent shell model predictions, where proton-core excitations were allowed in the calculations.

• OSTI ID: 21061925
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 2 Vol. 76; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
DSA METHOD
E2-TRANSITIONS
EXCITATION
EXCITED STATES
KEV RANGE
LIFETIME
MEV RANGE
NEUTRON REACTIONS
NEUTRONS
NUCLEAR STRUCTURE
OSCILLATOR STRENGTHS
PROTONS
SHELL MODELS
TIN 108
TIN 112
TIN 112 TARGET