Title: Fast-timing measurements in the ground-state band of ${}^{114}\mathrm{Pd}$

Abstract

Using a hybrid Gammasphere array coupled to 25 ${\mathrm{LaBr}}_3\left(\text{Ce}\right)$ detectors, the lifetimes of the first three levels of the yrast band in ${}_{114}\mathrm{Pd}$, populated via ${}_{252}\mathrm{Cf}$ decay, have been measured. The measured lifetimes are ${\tau }_{2^{+}}=103\left(10\right)\mathrm{ps},{\tau }_{4^{+}}=22\left(13\right)\mathrm{ps}$, and ${\tau }_{6^{+}}\le 10\mathrm{ps}$ for the $2_1^{+},4_1^{+}$, and $6_1^{+}$ levels, respectively. Palladium-114 was previously predicted to be the most deformed isotope of its isotopic chain, and spectroscopic studies have suggested it might also be a candidate nucleus for low-spin stable triaxiality. From the lifetimes measured here, reduced transition probabilities $B(E2;J\to J-2)$ are calculated and compared with interacting boson model, projected shell model, and collective model calculations from the literature. The experimental ratio $R_{B\left(E2\right)}=B(E2;4_1^{+}\to 2_1^{+})/B(E2;2_1^{+}\to 0_1^{+})=0.80\left(42\right)$ is measured for the first time in ${}_{114}\mathrm{Pd}$ and compared with the known values $R_{B\left(E2\right)}$ in the palladium isotopic chain: the systematics suggest that, for $N=68$, a transition from $\gamma$-unstable to a more rigid $\gamma$-deformed nuclear shape occurs.

Authors:

Gamba, E. R.  ^[1];

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Bruce, A. M. ^[1]; Lalkovski, S. ^[2]; Rudigier, M. ^[3]; Bottoni, S. ^[4]; Carpenter, M. P. ^[5]; Zhu, S. ^[5]; Anderson, J. T. ^[5]; Ayangeakaa, A. D. ^[6]; Berry, T. A. ^[3]; Burrows, I. ^[7]; Gallardo, M. Carmona ^[8]; Carroll, R. J. ^[3]; Copp, P. ^[9]; Cullen, D. M. ^[10]; Daniel, T. ^[11]; Martínez, G. Fernández ^[12]; Greene, J. P. ^[5]; Gurgi, L. A. ^[3]; Hartley, D. J. ^[13] more »; Ilieva, R. ^[3]; Ilieva, S. ^[12]; Kondev, F. G. ^[14]; Kröll, T. ^[12]; Lane, G. J. ^[15]; Lauritsen, T. ^[5]; Lazarus, I. ^[7]; Lotay, G. ^[3]; Niţă, C. R. ^[16]; Podolyák, Zs. ^[3]; Pucknell, V. ^[7]; Reed, M. ^[15]; Regan, P. H. ^[17]; Rohrer, J. ^[5]; Sethi, J. ^[5]; Seweryniak, D. ^[5]; Shand, C. M. ^[3]; Simpson, J. ^[7]; Smoleń, M. ^[18]; Stefanova, E. A. ^[19]; Vedia, V. ^[8]; Yordanov, O. ^[19] « less

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+ Show Author Affiliations

1. Univ. of Brighton (United Kingdom). School of Computing, Engineering and Mathematics
2. Univ. of Surrey, Guildford (United Kingdom). Dept. of Physics; Univ. of Sofia “St. Kl. Ohridski” (Bulgaria). Dept. of Nuclear Engineering
3. Univ. of Surrey, Guildford (United Kingdom). Dept. of Physics
4. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division; Istituto Nazionale di Fisica Nucleare (INFN), Milano (Italy); Univ. degli Studi di Milano (Italy). Dipartimento di Fisica
5. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division
6. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division; US Naval Academy, Annapolis, MD (United States)
7. Science and Technology Facilities Council (STFC), Daresbury (United Kingdom). Daresbury Lab.
8. Univ. Complutense Madrid (Spain). Grupo de Física Nuclear
9. Univ. of Massachusetts, Lowell, MA (United States). Dept. of Physics and Applied Physics
10. Univ. of Manchester (United Kingdom). School of Physics and Astronomy
11. Univ. of Surrey, Guildford (United Kingdom). Dept. of Physics; Benue State Univ. (Nigeria). Dept. of Physics
12. Technische Univ. Darmstadt (Germany). Inst. fur Kernphysik
13. US Naval Academy, Annapolis, MD (United States)
14. Argonne National Lab. (ANL), Argonne, IL (United States). Nuclear Engineering Division
15. Australian National Univ., Canberra, ACT (Australia). Research School of Physical Sciences and Engineering, Dept. of Nuclear Physics
16. Horia Hulubei National Inst. of Physics and Nuclear Engineering, Bucharest-Măgurele (Romania)
17. Univ. of Surrey, Guildford (United Kingdom). Dept. of Physics; National Physical Lab., Teddington (United Kingdom). AIR Division
18. Univ. of the West of Scotland, Paisley (United Kingdom). School of Engineering and Science
19. Bulgarian Academy of Sciences, Sofia (Bulgaria); Inst. for Nuclear Researches and Nuclear Energy (INRNE)

Publication Date:

Fri Oct 11 00:00:00 EDT 2019

Research Org.:

Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Nuclear Physics (NP); Science and Technology Facility Council (STFC); National Science Foundation (NSF)

OSTI Identifier:

1607453

Alternate Identifier(s):

OSTI ID: 1570072

Grant/Contract Number:  

AC02-06CH11357; ST/L005840/1; ST/L005743/1; ST/G000751/1; PHY-1502092

Resource Type:

Accepted Manuscript

Journal Name:

Physical Review C

Additional Journal Information:

Journal Volume: 100; Journal Issue: 4; Journal ID: ISSN 2469-9985

Publisher:

American Physical Society (APS)

Country of Publication:

United States

Language:

English

Subject:

73 NUCLEAR PHYSICS AND RADIATION PHYSICS