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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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Abstract

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
Authors :
NameEmailORCID
Valiente-Dobón, JJUNSPECIFIEDUNSPECIFIED
Regan, PHp.regan@surrey.ac.ukUNSPECIFIED
Wheldon, CUNSPECIFIEDUNSPECIFIED
Wu, CYUNSPECIFIEDUNSPECIFIED
Yoshinaga, NUNSPECIFIEDUNSPECIFIED
Higashiyama, KUNSPECIFIEDUNSPECIFIED
Smith, JFUNSPECIFIEDUNSPECIFIED
Cline, DUNSPECIFIEDUNSPECIFIED
Chakrawarthy, RSUNSPECIFIEDUNSPECIFIED
Chapman, RUNSPECIFIEDUNSPECIFIED
Cromaz, MUNSPECIFIEDUNSPECIFIED
Fallon, PUNSPECIFIEDUNSPECIFIED
Freeman, SJUNSPECIFIEDUNSPECIFIED
Görgen, AUNSPECIFIEDUNSPECIFIED
Gelletly, WUNSPECIFIEDUNSPECIFIED
Hayes, AUNSPECIFIEDUNSPECIFIED
Hua, HUNSPECIFIEDUNSPECIFIED
Langdown, SDUNSPECIFIEDUNSPECIFIED
Lee, IYUNSPECIFIEDUNSPECIFIED
Liang, XUNSPECIFIEDUNSPECIFIED
Macchiavelli, AOUNSPECIFIEDUNSPECIFIED
Pearson, CJUNSPECIFIEDUNSPECIFIED
Podolyák, ZUNSPECIFIEDUNSPECIFIED
Sletten, GUNSPECIFIEDUNSPECIFIED
Teng, RUNSPECIFIEDUNSPECIFIED
Ward, DUNSPECIFIEDUNSPECIFIED
Warner, DDUNSPECIFIEDUNSPECIFIED
Yamamoto, ADUNSPECIFIEDUNSPECIFIED
Date : 1 February 2004
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 12:33
Last Modified : 17 May 2017 15:04
URI: http://epubs.surrey.ac.uk/id/eprint/835771

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