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136Ba studied via deep-inelastic collisions: Identification of the (νh11/2)10+-2 isomer

Valiente-Dobón, JJ, Regan, PH, Wheldon, C, Wu, CY, Yoshinaga, N, Higashiyama, K, Smith, JF, Cline, D, Chakrawarthy, RS, Chapman, R , Cromaz, M, Fallon, P, Freeman, SJ, Görgen, A, Gelletly, W, Hayes, A, Hua, H, Langdown, SD, Lee, IY, Liang, X, Macchiavelli, AO, Pearson, CJ, Podolyák, Z, Sletten, G, Teng, R, Ward, D, Warner, DD and Yamamoto, AD (2004) 136Ba studied via deep-inelastic collisions: Identification of the (νh11/2)10+-2 isomer Physical Review C - Nuclear Physics, 69 (2). pp. 243161-2431613.

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A multinucleon transfer reaction between a thin self-supporting 78198Pt target and an 850 MeV 54136X6 beam has been used to populate and study the structure of the N=80 isotone 56136Ba. Making use of time-correlated γ-ray spectroscopy, evidence for an Iπ=(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 (vh 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 50130Sn to 68148Er. A qualitative explanation of the observed dramatic decrease in the B(E2:10+→8+) value for the N=80 isotones at 136Ba is given in terms of the increasing single-hole energy of the h11/2 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 γ-ray fold versus the scattering angle of the recoils.

Item Type: Article
Divisions : Surrey research (other units)
Authors :
Valiente-Dobón, JJ
Wheldon, C
Wu, CY
Yoshinaga, N
Higashiyama, K
Smith, JF
Cline, D
Chakrawarthy, RS
Chapman, R
Cromaz, M
Fallon, P
Freeman, SJ
Görgen, A
Gelletly, W
Hayes, A
Hua, H
Langdown, SD
Lee, IY
Liang, X
Macchiavelli, AO
Pearson, CJ
Podolyák, Z
Sletten, G
Teng, R
Ward, D
Warner, DD
Yamamoto, AD
Date : 1 February 2004
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 12:33
Last Modified : 24 Jan 2020 22:27

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