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Isomer-tagged differential-plunger measurements in proton-unbound 144Ho

Mason, PJR, Cullen, DM, Scholey, C, Dewald, A, M�ller, O, Iwasaki, H, Pissulla, T, Rother, W, Dare, JA, Greenlees, PT , Jakobsson, U, Jones, PM, Julin, R, Juutinen, S, Ketelhut, S, Leino, M, Lumley, NM, Niclasen, B, Nyman, M, Peura, P, Puurunen, A, Rahkila, P, Ruotsalainen, P, Sorri, J, Sar�n, J, Uusitalo, J and Xu, FR (2010) Isomer-tagged differential-plunger measurements in proton-unbound 144Ho Physics Letters B, 683 (1). pp. 17-20.

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The lifetime of an excited state above a weakly populated isomer in the proton-unbound odd-odd nucleus 144Ho has been measured using the recoil distance Doppler shift method. This measurement represents the first differential-plunger lifetime measurement to utilize recoil-isomer tagging. The first excited I[pi]=(10+) state above the two-quasiparticle [pi]h11/2[circle times operator][nu]h11/2(8+) isomer was determined to have a lifetime of [tau]=6(1)�ps. Potential energy surface calculations, based on the configuration-constrained blocking method, predict the isomeric state to have [gamma]-soft triaxial-nuclear shape with [gamma][approximate]24�. The lifetime of the (10+) state can be understood from these calculations if there is a degree of rotational alignment in this band, with the K value being lower than the bandhead spin. However, the validity of the K quantum number with large predicted triaxiality and gamma softness requires further theoretical study.

Item Type: Article
Divisions : Faculty of Arts and Social Sciences > Department of Music and Media
Authors :
Mason, PJR
Cullen, DM
Scholey, C
Dewald, A
M�ller, O
Iwasaki, H
Pissulla, T
Rother, W
Dare, JA
Greenlees, PT
Jakobsson, U
Jones, PM
Julin, R
Juutinen, S
Ketelhut, S
Leino, M
Lumley, NM
Niclasen, B
Nyman, M
Peura, P
Puurunen, A
Rahkila, P
Ruotsalainen, P
Sorri, J
Sar�n, J
Uusitalo, J
Xu, FR
Date : 11 January 2010
DOI : 10.1016/j.physletb.2009.11.042
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 28 Mar 2017 14:58
Last Modified : 05 Mar 2019 10:35

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