High angular momentum states populated in fragmentation reactions

Podolyák, Zs.; Gerl, J.; Hellström, M.; Becker, F.; Gladnishki, K.; Górska, M.; Kelić, A.; Kopatch, Y.; Mandal, S.; Regan, P. H.; Schmidt, K.‐H.; Walker, P. M.; Wollersheim, H. J.; Banu, A.; Boardman, H. J.; Casarejos, E.; Ekman, Jörgen; Geißel, H.; Grawe, H.; Höhn, D.; Kojouharov, I.; Leske, J.; Lozeva, R.; Mineva, MN; Neyens, G.; Page, R. D.; Pearson, C. J.; Portillo, M.; Rudolph, Dirk; Saito, N.; Schaffner, H.; Sohler, D.; Sümmerer, K.; Valiente-Dobón, J.J.; Wheldon, C.; Weick, H.; Winkler, M.

doi:10.1016/j.physletb.2005.10.070

Cited by 27 publications

(17 citation statements)

References 26 publications

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“…The results of the current study and that of a parallel work [10] show a similar behavior of the isomeric ratios to that observed in Ref. [9] in heavy nuclei at high spins. In addition, the current study revealed new neutron-rich isotopes [11] and produced new spectroscopic information in some nuclei [12].…”

Section: Introductionsupporting

confidence: 89%

“…[10] is just over a factor of 4 greater than the value of R exp presented in Ref. [9] (and neither of these measurements agree within uncertainty limits).…”

Section: A Analysis Of Isomeric Ratioscontrasting

confidence: 61%

“…5, isomeric ratios determined in Ref. [9] are consistently lower than those in Ref. [10] (square and circular data points, respectively).…”

Section: A Analysis Of Isomeric Ratiosmentioning

confidence: 56%

“…[8]) that measuring the fraction of nuclei produced in an isomeric state relative to the total number of identified nuclei (isomeric ratio) can provide insight into the generation of angular momentum during peripheral collisions between nuclei at relativistic velocities. In particular, a comparison of experimental isomeric ratios [9] with those predicted by theory revealed that for spins of 17h and (43/2)h in 214 Ra and 215 Ra, respectively, the experimental yield was underestimated by a factor ≈3-10.…”

Section: Introductionmentioning

confidence: 91%

“…R exp is plotted against the angular momentum of the isomeric state of interest and includes measurements taken from the current work and from Refs. [1,9,10,48]. The mass loss A of the fragments compared with the beam is shown on the secondary x axis.…”

Section: A Analysis Of Isomeric Ratiosmentioning

confidence: 99%

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Population of high-spin isomeric states following fragmentation of238U

Bowry¹,

Podolyák²,

Piétri³

et al. 2013

Phys. Rev. C

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Isomeric ratios have been determined for 23 metastable states identified in A ≈ 200 nuclei from Pt to Rn near the valley of stability following fragmentation of 238 U. This includes high-spin states with angular momenta ranging from (39/2)h to 25h. The experimental results are discussed together with those of similar experiments performed in this mass region. Isomeric ratios are compared with theoretical predictions where the angular momentum of the fragment arises purely due to the angular momentum of nucleons removed from the projectile. The theoretical yield of low-spin states is generally overestimated. In these cases the assumption of 100% feeding of the isomer may require modification. However, the yield of high-spin isomeric states [I m (39/2)h] is significantly underestimated and highlights the requirement for a more complete theoretical framework in relation to the generation of fragment angular momentum. The enhanced population of high-spin states reported here is advantageous to future studies involving isomeric beams at fragmentation facilities such as the Rikagaku Kenkyusho RI Beam Factory (Japan) and next-generation facilities at the Facility for Antiproton and Ion Research (Germany) and Facility for Rare Isotope Beams (USA).

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Section: Introductionsupporting

confidence: 89%

“…[10] is just over a factor of 4 greater than the value of R exp presented in Ref. [9] (and neither of these measurements agree within uncertainty limits).…”

Section: A Analysis Of Isomeric Ratioscontrasting

confidence: 61%

“…5, isomeric ratios determined in Ref. [9] are consistently lower than those in Ref. [10] (square and circular data points, respectively).…”

Section: A Analysis Of Isomeric Ratiosmentioning

confidence: 56%

Section: Introductionmentioning

confidence: 91%

Section: A Analysis Of Isomeric Ratiosmentioning

confidence: 99%

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