SwePub
Sök i LIBRIS databas

  Extended search

onr:"swepub:oai:DiVA.org:uu-362692"
 

Search: onr:"swepub:oai:DiVA.org:uu-362692" > First isomeric yiel...

  • 1 of 1
  • Previous record
  • Next record
  •    To hitlist
  • Rakopoulos, VasileiosUppsala universitet,Tillämpad kärnfysik (author)

First isomeric yield ratio measurements by direct ion counting and implications for the angular momentum of the primary fission fragments

  • Article/chapterEnglish2018

Publisher, publication year, extent ...

  • AMER PHYSICAL SOC,2018
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:uu-362692
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-362692URI
  • https://doi.org/10.1103/PhysRevC.98.024612DOI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • We report the first experimental determination of independent isomeric yield ratios using direct ion counting with a Penning trap, which offered such a high resolution in mass that isomeric states could be separated. The measurements were performed at the Ion Guide Isotope Separator On-Line (IGISOL) facility at the University of Jyvaskyla. The isomer production ratios of Ge-81, Y-96,Y-97 Sn-128(,1)30, and Sb-129 in the 25-MeV proton-induced fission of U-na(t) and Th-232 were studied. Three isomeric pairs (Ge-81, Y-96, and Sb-129) were measured for the first time for the U-na(t)(p, f) reaction, while all the reported yield ratios for the Th-232(p, f) reaction were determined for the first time. The comparison of the experimentally determined isomeric yield ratios with data available in the literature shows a reasonable agreement, except for the case of Sn-130 for unspecified reasons. The obtained results were also compared with the GEF model, where good agreement can be noticed in most cases for both reactions. Serious discrepancies can only be observed for the cases of Y-96(,)97 for both reactions. Moreover, based on the isomeric yield ratios, the root-mean-square angular momenta (J(r)(ms)) of the fission fragments after scission were estimated using the TALYS code. The experimentally determined isomeric yield ratios, and consequently the deduced J(rms), for Sn-130 are significantly lower compared to Sn-128 for both fissioning systems. This can be attributed to the more spherical shape of the fragments that contribute to the formation of Sn-130, due to their proximity to the N = 82 shell closure. The values of J(rms) for Sb-129 are higher than Sn-128 for both reactions, despite the same neutron number of both nuclides (N = 78), indicating the odd-Z effect where fission fragments with odd-Z number tend to bear larger angular momentum than even-Z fragments. The isomer production ratio for the isotopes of Sn is more enhanced in the U-na(t)(p, f) reaction than in Th-232(p, f). The opposite is observed for Y-96 and Y-97. These discrepancies might be associated to different scission shapes of the fragments for the two fission reactions, indicating the impact that the different fission modes can have on the isomeric yield ratios.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Lantz, Mattias,1971-Uppsala universitet,Tillämpad kärnfysik(Swepub:uu)malan676 (author)
  • Solders, Andreas,1976-Uppsala universitet,Tillämpad kärnfysik(Swepub:uu)andso900 (author)
  • Al-Adili, AliUppsala universitet,Tillämpad kärnfysik(Swepub:uu)alial125 (author)
  • Mattera, Andrea,1985-Uppsala universitet,Tillämpad kärnfysik(Swepub:uu)andma258 (author)
  • Canete, L.Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland (author)
  • Eronen, T.Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland (author)
  • Gorelov, D.Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland (author)
  • Jokinen, A.Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland (author)
  • Kankainen, A.Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland (author)
  • Kolhinen, V. S.Texas A&M Univ, Inst Cyclotron, College Stn, TX 77843 USA;Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland (author)
  • Moore, I. D.Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland (author)
  • Nesterenko, D. A.Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland (author)
  • Penttila, H.Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland (author)
  • Pohjalainen, I.Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland (author)
  • Rinta-Antila, S.Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland (author)
  • Simutkin, Vasily,1974-Uppsala universitet,Tillämpad kärnfysik(Swepub:uu)vasim517 (author)
  • Vilen, M.Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland (author)
  • Voss, A.Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland (author)
  • Pomp, Stephan,1968-Uppsala universitet,Tillämpad kärnfysik(Swepub:uu)steppomp (author)
  • Uppsala universitetTillämpad kärnfysik (creator_code:org_t)

Related titles

  • In:Physical Review C: AMER PHYSICAL SOC98:22469-99852469-9993

Internet link

Find in a library

To the university's database

  • 1 of 1
  • Previous record
  • Next record
  •    To hitlist

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Close

Copy and save the link in order to return to this view