K-hindered decay of a six-quasiparticle isomer in 176Hf

G Mukherjee; P Chowdhury; FG Kondev; PM Walker; GD Dracoulis; R D'Alarcao; I Shestakova; K Abu Saleem; I Ahmad; MP Carpenter; A Heinz; RVF Janssens; TL Khoo; T Lauritsen; CJ Lister; D Seweryniak; I Wiedenhoever; DM Cullen; Carl Wheldon; DL Balabanski; M Danchev; TM Goon; DJ Hartley; LL Riedinger; O Zeidan; MA Riley; RA Kaye; G Sletten

doi:10.1103/PhysRevC.82.054316

K-hindered decay of a six-quasiparticle isomer in ¹⁷⁶Hf

G Mukherjee, P Chowdhury, FG Kondev, PM Walker, GD Dracoulis, R D'Alarcao, I Shestakova, K Abu Saleem, I Ahmad, MP Carpenter, A Heinz, RVF Janssens, TL Khoo, T Lauritsen, CJ Lister, D Seweryniak, I Wiedenhoever, DM Cullen, Carl Wheldon, DL BalabanskiM Danchev, TM Goon, DJ Hartley, LL Riedinger, O Zeidan, MA Riley, RA Kaye, G Sletten

Physics and Astronomy

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Abstract

The structure and decay properties of high-K isomers in Hf176 have been studied using beam sweeping techniques and the Gammasphere multidetector array. A new ΔK=8 decay branch, from a Kπ=22-, six-quasiparticle, isomeric (t1/2=43μs) state at 4864 keV to the 20- state of a Kπ=14- band, has been identified. The reduced hindrance factor per degree of K forbiddenness for this decay is measured to be unusually low (fν=3.2), which suggests K mixing in the states involved. The deduced interaction matrix elements are discussed within the context of relevant K-mixing scenarios. The 3266-keV state, previously interpreted as a Kπ=16+ intrinsic state, is reassigned as the Jπ=16+ member of the band based on the Kπ=15+ state at 3080 keV. The systematics of fν values as a function of the degree of forbiddenness is discussed in light of this change.

Original language	English
Article number	054316
Pages (from-to)	1-6
Number of pages	6
Journal	Physical Review C
Volume	82
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.82.054316
Publication status	Published - 1 Nov 2010

Keywords

Collective levels
Isomer decay
150<=A<=189
gamma transitions and level energies

Access to Document

10.1103/PhysRevC.82.054316

Hf176Submitted manuscript, 283 KB

Birmingham Nuclear Physics Group Rolling Grant
Tungate, G. (Principal Investigator), Lazzeroni, C. (Co-Investigator), Evans, P. (Co-Investigator), Jones, P. (Co-Investigator) & Freer, M. (Co-Investigator)
SCIENCE & TECHNOLOGY FACILITIES COUNCIL
1/08/08 → 31/07/13
Project: Research Councils
Advanced Fellowship - Dr Carl Wheldon
Wheldon, C. (Principal Investigator)
SCIENCE & TECHNOLOGY FACILITIES COUNCIL
29/10/07 → 28/10/12
Project: Research

Cite this

Mukherjee, G., Chowdhury, P., Kondev, FG., Walker, PM., Dracoulis, GD., D'Alarcao, R., Shestakova, I., Abu Saleem, K., Ahmad, I., Carpenter, MP., Heinz, A., Janssens, RVF., Khoo, TL., Lauritsen, T., Lister, CJ., Seweryniak, D., Wiedenhoever, I., Cullen, DM., Wheldon, C., ... Sletten, G. (2010). K-hindered decay of a six-quasiparticle isomer in ¹⁷⁶Hf. Physical Review C, 82(5), 1-6. Article 054316. https://doi.org/10.1103/PhysRevC.82.054316

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title = "K-hindered decay of a six-quasiparticle isomer in 176Hf",

abstract = "The structure and decay properties of high-K isomers in Hf176 have been studied using beam sweeping techniques and the Gammasphere multidetector array. A new ΔK=8 decay branch, from a Kπ=22-, six-quasiparticle, isomeric (t1/2=43μs) state at 4864 keV to the 20- state of a Kπ=14- band, has been identified. The reduced hindrance factor per degree of K forbiddenness for this decay is measured to be unusually low (fν=3.2), which suggests K mixing in the states involved. The deduced interaction matrix elements are discussed within the context of relevant K-mixing scenarios. The 3266-keV state, previously interpreted as a Kπ=16+ intrinsic state, is reassigned as the Jπ=16+ member of the band based on the Kπ=15+ state at 3080 keV. The systematics of fν values as a function of the degree of forbiddenness is discussed in light of this change.",

keywords = "Collective levels, Isomer decay, 150<=A<=189, gamma transitions and level energies",

author = "G Mukherjee and P Chowdhury and FG Kondev and PM Walker and GD Dracoulis and R D'Alarcao and I Shestakova and {Abu Saleem}, K and I Ahmad and MP Carpenter and A Heinz and RVF Janssens and TL Khoo and T Lauritsen and CJ Lister and D Seweryniak and I Wiedenhoever and DM Cullen and Carl Wheldon and DL Balabanski and M Danchev and TM Goon and DJ Hartley and LL Riedinger and O Zeidan and MA Riley and RA Kaye and G Sletten",

year = "2010",

month = nov,

day = "1",

doi = "10.1103/PhysRevC.82.054316",

language = "English",

volume = "82",

pages = "1--6",

journal = "Physical Review C",

publisher = "American Physical Society (APS)",

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Mukherjee, G, Chowdhury, P, Kondev, FG, Walker, PM, Dracoulis, GD, D'Alarcao, R, Shestakova, I, Abu Saleem, K, Ahmad, I, Carpenter, MP, Heinz, A, Janssens, RVF, Khoo, TL, Lauritsen, T, Lister, CJ, Seweryniak, D, Wiedenhoever, I, Cullen, DM, Wheldon, C, Balabanski, DL, Danchev, M, Goon, TM, Hartley, DJ, Riedinger, LL, Zeidan, O, Riley, MA, Kaye, RA & Sletten, G 2010, 'K-hindered decay of a six-quasiparticle isomer in ¹⁷⁶Hf', Physical Review C, vol. 82, no. 5, 054316, pp. 1-6. https://doi.org/10.1103/PhysRevC.82.054316

TY - JOUR

T1 - K-hindered decay of a six-quasiparticle isomer in 176Hf

AU - Mukherjee, G

AU - Chowdhury, P

AU - Kondev, FG

AU - Walker, PM

AU - Dracoulis, GD

AU - D'Alarcao, R

AU - Shestakova, I

AU - Abu Saleem, K

AU - Ahmad, I

AU - Carpenter, MP

AU - Heinz, A

AU - Janssens, RVF

AU - Khoo, TL

AU - Lauritsen, T

AU - Lister, CJ

AU - Seweryniak, D

AU - Wiedenhoever, I

AU - Cullen, DM

AU - Wheldon, Carl

AU - Balabanski, DL

AU - Danchev, M

AU - Goon, TM

AU - Hartley, DJ

AU - Riedinger, LL

AU - Zeidan, O

AU - Riley, MA

AU - Kaye, RA

AU - Sletten, G

PY - 2010/11/1

Y1 - 2010/11/1

N2 - The structure and decay properties of high-K isomers in Hf176 have been studied using beam sweeping techniques and the Gammasphere multidetector array. A new ΔK=8 decay branch, from a Kπ=22-, six-quasiparticle, isomeric (t1/2=43μs) state at 4864 keV to the 20- state of a Kπ=14- band, has been identified. The reduced hindrance factor per degree of K forbiddenness for this decay is measured to be unusually low (fν=3.2), which suggests K mixing in the states involved. The deduced interaction matrix elements are discussed within the context of relevant K-mixing scenarios. The 3266-keV state, previously interpreted as a Kπ=16+ intrinsic state, is reassigned as the Jπ=16+ member of the band based on the Kπ=15+ state at 3080 keV. The systematics of fν values as a function of the degree of forbiddenness is discussed in light of this change.

AB - The structure and decay properties of high-K isomers in Hf176 have been studied using beam sweeping techniques and the Gammasphere multidetector array. A new ΔK=8 decay branch, from a Kπ=22-, six-quasiparticle, isomeric (t1/2=43μs) state at 4864 keV to the 20- state of a Kπ=14- band, has been identified. The reduced hindrance factor per degree of K forbiddenness for this decay is measured to be unusually low (fν=3.2), which suggests K mixing in the states involved. The deduced interaction matrix elements are discussed within the context of relevant K-mixing scenarios. The 3266-keV state, previously interpreted as a Kπ=16+ intrinsic state, is reassigned as the Jπ=16+ member of the band based on the Kπ=15+ state at 3080 keV. The systematics of fν values as a function of the degree of forbiddenness is discussed in light of this change.

KW - Collective levels

KW - Isomer decay

KW - 150<=A<=189

KW - gamma transitions and level energies

U2 - 10.1103/PhysRevC.82.054316

DO - 10.1103/PhysRevC.82.054316

M3 - Article

VL - 82

SP - 1

EP - 6

JO - Physical Review C

JF - Physical Review C

IS - 5

M1 - 054316

ER -

K-hindered decay of a six-quasiparticle isomer in 176Hf

Abstract

Keywords

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Projects

Birmingham Nuclear Physics Group Rolling Grant

Advanced Fellowship - Dr Carl Wheldon

Cite this

K-hindered decay of a six-quasiparticle isomer in ¹⁷⁶Hf