Population of high-spin isomeric states following fragmentation of U-238

M. Bowry; Zs. Podolyák; S. Pietri; J. Kurcewicz; M. Bunce; P.H. Regan; F. Farinon; H.  Geissel; C. Nociforo; A. Prochazka; H. Weick; N. Al-Dahan; N. Alkhomashi; P.R.P. Allegro; J. Benlliure; G. Benzoni; P. Boutachkov; A.M. Bruce; A.M. Denis Bacelar; G.F. Farrelly; J. Gerl; M. Górska; A. Gottardo; J. Grebosz; N. Gregor; R. Janik; R. Knobel; I. Kojouharov; T. Kubo; N. Kurz; Yu.A. Litvinov; E. Merchan; I. Mukha; F. Naqvi; B. Pfeiffer; M. Pfützner; W. Plass; M. Pomorski; B. Riese; M.V. Ricciardi; K.-H. Schmidt; H. Schaffner; C. Scheidenberger; E.C. Simpson; B. Sitar; P. Spiller; J. Stadlmann; P. Strmen; B. Sun; I. Tanihata; S. Terashima; J.J. Valiente-Dobon; J.S. Winfield; H.J. Wollersheim; P.J. Woods

doi:10.1103/PhysRevC.88.024611

Population of high-spin isomeric states following fragmentation of U-238

M. Bowry, Zs. Podolyák, S. Pietri, J. Kurcewicz, M. Bunce, P.H. Regan, F. Farinon, H. Geissel, C. Nociforo, A. Prochazka, H. Weick, N. Al-Dahan, N. Alkhomashi, P.R.P. Allegro, J. Benlliure, G. Benzoni, P. Boutachkov, A.M. Bruce, A.M. Denis Bacelar, G.F. FarrellyJ. Gerl, M. Górska, A. Gottardo, J. Grebosz, N. Gregor, R. Janik, R. Knobel, I. Kojouharov, T. Kubo, N. Kurz, Yu.A. Litvinov, E. Merchan, I. Mukha, F. Naqvi, B. Pfeiffer, M. Pfützner, W. Plass, M. Pomorski, B. Riese, M.V. Ricciardi, K.-H. Schmidt, H. Schaffner, C. Scheidenberger, E.C. Simpson, B. Sitar, P. Spiller, J. Stadlmann, P. Strmen, B. Sun, I. Tanihata, S. Terashima, J.J. Valiente-Dobon, J.S. Winfield, H.J. Wollersheim, P.J. Woods

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Abstract

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 238U. This includes high-spin states with angular momenta ranging from (39/2)ℏ to 25ℏ. 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 [Im ≥ (39/2)ℏ] 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).

Original language	English
Article number	024611
Journal	Physical Review C
Volume	88
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevC.88.024611
Publication status	Published - 16 Aug 2013
Externally published	Yes

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Bowry, M., Podolyák, Z., Pietri, S., Kurcewicz, J., Bunce, M., Regan, P. H., Farinon, F., Geissel, H., Nociforo, C., Prochazka, A., Weick, H., Al-Dahan, N., Alkhomashi, N., Allegro, P. R. P., Benlliure, J., Benzoni, G., Boutachkov, P., Bruce, A. M., Denis Bacelar, A. M., ... Woods, P. J. (2013). Population of high-spin isomeric states following fragmentation of U-238. Physical Review C, 88(2), Article 024611. https://doi.org/10.1103/PhysRevC.88.024611

@article{012d8c80440744d69979a6c077823951,

title = "Population of high-spin isomeric states following fragmentation of U-238",

abstract = "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 238U. This includes high-spin states with angular momenta ranging from (39/2)ℏ to 25ℏ. 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 [Im ≥ (39/2)ℏ] 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).",

author = "M. Bowry and Zs. Podoly{\'a}k and S. Pietri and J. Kurcewicz and M. Bunce and P.H. Regan and F. Farinon and H. Geissel and C. Nociforo and A. Prochazka and H. Weick and N. Al-Dahan and N. Alkhomashi and P.R.P. Allegro and J. Benlliure and G. Benzoni and P. Boutachkov and A.M. Bruce and {Denis Bacelar}, A.M. and G.F. Farrelly and J. Gerl and M. G{\'o}rska and A. Gottardo and J. Grebosz and N. Gregor and R. Janik and R. Knobel and I. Kojouharov and T. Kubo and N. Kurz and Yu.A. Litvinov and E. Merchan and I. Mukha and F. Naqvi and B. Pfeiffer and M. Pf{\"u}tzner and W. Plass and M. Pomorski and B. Riese and M.V. Ricciardi and K.-H. Schmidt and H. Schaffner and C. Scheidenberger and E.C. Simpson and B. Sitar and P. Spiller and J. Stadlmann and P. Strmen and B. Sun and I. Tanihata and S. Terashima and J.J. Valiente-Dobon and J.S. Winfield and H.J. Wollersheim and P.J. Woods",

year = "2013",

month = aug,

day = "16",

doi = "10.1103/PhysRevC.88.024611",

language = "English",

volume = "88",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

number = "2",

}

Bowry, M, Podolyák, Z, Pietri, S, Kurcewicz, J, Bunce, M, Regan, PH, Farinon, F, Geissel, H, Nociforo, C, Prochazka, A, Weick, H, Al-Dahan, N, Alkhomashi, N, Allegro, PRP, Benlliure, J, Benzoni, G, Boutachkov, P, Bruce, AM, Denis Bacelar, AM, Farrelly, GF, Gerl, J, Górska, M, Gottardo, A, Grebosz, J, Gregor, N, Janik, R, Knobel, R, Kojouharov, I, Kubo, T, Kurz, N, Litvinov, YA, Merchan, E, Mukha, I, Naqvi, F, Pfeiffer, B, Pfützner, M, Plass, W, Pomorski, M, Riese, B, Ricciardi, MV, Schmidt, K-H, Schaffner, H, Scheidenberger, C, Simpson, EC, Sitar, B, Spiller, P, Stadlmann, J, Strmen, P, Sun, B, Tanihata, I, Terashima, S, Valiente-Dobon, JJ, Winfield, JS, Wollersheim, HJ & Woods, PJ 2013, 'Population of high-spin isomeric states following fragmentation of U-238', Physical Review C, vol. 88, no. 2, 024611. https://doi.org/10.1103/PhysRevC.88.024611

TY - JOUR

T1 - Population of high-spin isomeric states following fragmentation of U-238

AU - Bowry, M.

AU - Podolyák, Zs.

AU - Pietri, S.

AU - Kurcewicz, J.

AU - Bunce, M.

AU - Regan, P.H.

AU - Farinon, F.

AU - Geissel, H.

AU - Nociforo, C.

AU - Prochazka, A.

AU - Weick, H.

AU - Al-Dahan, N.

AU - Alkhomashi, N.

AU - Allegro, P.R.P.

AU - Benlliure, J.

AU - Benzoni, G.

AU - Boutachkov, P.

AU - Bruce, A.M.

AU - Denis Bacelar, A.M.

AU - Farrelly, G.F.

AU - Gerl, J.

AU - Górska, M.

AU - Gottardo, A.

AU - Grebosz, J.

AU - Gregor, N.

AU - Janik, R.

AU - Knobel, R.

AU - Kojouharov, I.

AU - Kubo, T.

AU - Kurz, N.

AU - Litvinov, Yu.A.

AU - Merchan, E.

AU - Mukha, I.

AU - Naqvi, F.

AU - Pfeiffer, B.

AU - Pfützner, M.

AU - Plass, W.

AU - Pomorski, M.

AU - Riese, B.

AU - Ricciardi, M.V.

AU - Schmidt, K.-H.

AU - Schaffner, H.

AU - Scheidenberger, C.

AU - Simpson, E.C.

AU - Sitar, B.

AU - Spiller, P.

AU - Stadlmann, J.

AU - Strmen, P.

AU - Sun, B.

AU - Tanihata, I.

AU - Terashima, S.

AU - Valiente-Dobon, J.J.

AU - Winfield, J.S.

AU - Wollersheim, H.J.

AU - Woods, P.J.

PY - 2013/8/16

Y1 - 2013/8/16

N2 - 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 238U. This includes high-spin states with angular momenta ranging from (39/2)ℏ to 25ℏ. 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 [Im ≥ (39/2)ℏ] 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).

AB - 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 238U. This includes high-spin states with angular momenta ranging from (39/2)ℏ to 25ℏ. 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 [Im ≥ (39/2)ℏ] 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).

U2 - 10.1103/PhysRevC.88.024611

DO - 10.1103/PhysRevC.88.024611

M3 - Article

SN - 2469-9985

VL - 88

JO - Physical Review C

JF - Physical Review C

IS - 2

M1 - 024611

ER -

Population of high-spin isomeric states following fragmentation of U-238

Abstract

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