Investigation of the {sup 128}Ba nucleus with the (p,t) reaction

Journal Article · Mon Jun 15 04:00:00 EDT 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.79.064323· OSTI ID:21289917

Pascu, S; Cata-Danil, Gh ^[1]; Bucurescu, D; Marginean, N; Zamfir, N V ^[1]; Graw, G; Gollwitzer, A; Hofer, D; Valnion, B D ^[2]

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1. National Institute for Physics and Nuclear Engineering, RO-77125, Bucharest-Magurele (Romania)
2. Fakultaet fuer Physik der Universitaet Muenchen, D-85748 Garching (Germany)

The low lying states in {sup 128}Ba have been investigated for the first time with the {sup 130}Ba(p,t){sup 128}Ba reaction. The experiment was performed at the Munich Q3D magnetic spectrograph with a 25-MeV proton beam and a high-resolution, 1.5-m-long focal plane detector. As a result of this experiment 27 excited levels with energies below 3.7 MeV have been observed for the first time, significantly increasing (by {approx}50%) the number of levels observed in {sup 128}Ba. Angular distributions of tritons were measured and their comparison with the distorted wave Born approximation calculation allowed in most cases spin and parity assignments for the nuclear levels. The experimental two-neutron transition strengths with transferred angular momentum L=0 and 2 are compared with the predictions of the IBA-1 model with a new set of parameters. The results indicate for the first time from a hadronic probe perspective a transitional structure close to the O(6) symmetry for the {sup 128}Ba nucleus, confirming previous conclusions of {gamma}-ray spectroscopy studies.

• OSTI ID: 21289917
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 79; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM TRANSFER
BARIUM 128
BARIUM 130 TARGET
COMPARATIVE EVALUATIONS
DWBA
EXCITED STATES
FORECASTING
GAMMA SPECTROSCOPY
MEV RANGE 01-10
MEV RANGE 10-100
NEUTRONS
O GROUPS
PARITY
PROTON BEAMS
RESOLUTION
SPIN
SYMMETRY
TRITONS