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Ba-136 Studied Via Deep-Inelastic Collisions: Identification of the (vh(11/2))(10+)(-2) Isomer

Valiente-Dobon, J J, Regan, R H, Wheldon, C, Wu, C Y, Yoshinaga, N, Higashiyama, K, Smith, J F, Cline, D, Chakrawarthy, R S, Chapman, R, Cromaz, M, Fallon, P, Freeman, S J, Gorgen, A, Gelletly, W, Hayes, A, Hua, H, Langdown, S D, Lee, I Y, Liang, X, Macchiavelli, A O, Pearson, C J, Podolyak, Z, Sletten, G, Teng, R, Ward, D, Warner, D D and Yamamoto, A D (2004) Ba-136 Studied Via Deep-Inelastic Collisions: Identification of the (vh(11/2))(10+)(-2) Isomer Physical Review C, 69 (2). ISSN 0556-2813


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A multinucleon transfer reaction between a thin self-supporting Pt-198(78) target and an 850 MeV Xe-136(54) beam has been used to populate and study the structure of the N=80 isotone Ba-136(56). Making use of time-correlated gamma-ray spectroscopy, evidence for an I-pi=(10(+)) isomeric state has been found with a measured half-life of 91+/-2 ns. Prompt-delayed correlations have also enabled the tentative, measurement of the near-yrast states which lie above the isomer. Shell-model calculations suggest that the isomer has a structure which can be assigned predominantly as (nuh(11/2))(10+)(-2). The results are discussed in terms of standard and pair-truncated shell-model calculations, and compared to the even-Z N=80 isotones ranging from Sn-130(50) to Er-148(68). A qualitative explanation of the observed dramatic decrease in the B(E2:10(+)-->8(+)) value for the N=80 isotones at Ba-136 is given in terms of the increasing single-hole energy of the h(11/2) neutron configuration as the proton subshell is filled. The angular momentum transfer to the binary fragments in the reaction has also been investigated in terms of the average total gamma-ray fold versus the scattering angle of the recoils.

Item Type: Article
Additional Information: Published in <i>Physical Review C,</i> Vol. 69, Iss. 2. Copyright 2004 American Physical Society. Click <a href=>here</a> to access the journal's website.
Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:06
Last Modified: 23 Sep 2013 18:26

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