Development of the recoil-beta tagging method and recoil-beta tagging studies of ⁶⁶As and ⁶⁶Se
The structure of self-conjugate odd-odd N = Z nucleus 66As has been experimentally
studied in detail. Prompt and isomeric excited states have been
observed utilising recoil-β tagging and recoil-isomer tagging methods. Most importantly,
candidates for the excited states in the T = 1 band were identified up
to spin Jπ = 6+. Three new detectors i.e., a charged-particle veto detector, a
highly-pixelated DSSD and a phosphor sandwich device have been constructed
and tested to enhance the sensitivity of the recoil-β tagging approach. The
newly developed charged-particle veto detector in conjunction with the recoil-β
tagging allowed excited states in the exotic neutron-deficient N = Z − 2 nucleus
66Se to be identified up to spin Jπ = 6+. The newly obtained spectroscopic
results both in 66As and 66Se permitted the derivation of energy differences
between isobaric analogue states in the full A = 66 triplet. These results show
that both the charge-symmetry and charge-independence characteristics of the
strong nucleon-nucleon interaction are violated. Moreover, the experimental
energy differences are larger than predicted by the shell-model calculations.
This points towards a need for an additional isospin non-conserving interaction,
whose fundamental origin cannot be explained on the basis of existing
nuclear models.
...
ISBN
978-951-39-5417-8ISSN Hae Julkaisufoorumista
0075-465XJulkaisuun sisältyy osajulkaisuja
- Artikkeli I: Ruotsalainen, P., Scholey, C., Julin, R., Hauschild, K., Kaneko, K., Singh, B. N., Wadsworth, R., Jenkins, D., Brock, T., Greenlees, P., Henderson, J., Jakobsson, U., Jones, P., Juutinen, S., Ketelhut, S., Leino, M., Lumley, N., Mason, P., Nieminen, P., . . . Uusitalo, J. (2013). Recoil-beta tagging study of the N=Z nucleus 66As. Physical Review C, 88(2), Article 024320. DOI: 10.1103/PhysRevC.88.024320
- Artikkeli II: Ruotsalainen, P., Jenkins, D., Bentley, M., Wadsworth, R., Scholey, C., Auranen, K., Davies, P., Grahn, T., Greenlees, P., Henderson, J., Herzan, A., Jakobsson, U., Joshi, P., Julin, R., Juutinen, S., Konki, J., Leino, M., Lotay, G., Nichols, A., . . . Uusitalo, J. (2013). Spectroscopy of proton-rich 66Se up to$ J = 6^+$: Isospin-breaking effect in the A = 66 isobaric triplet. Physical Review C, 88, Article 041308R. DOI: 10.1103/PhysRevC.88.041308. JYX: jyx.jyu.fi/handle/123456789/48635
- Artikkeli III: Henderson, J., Ruotsalainen, P., Jenkins, D., Scholey, C., Auranen, K., Davies, P., Grahn, T., Greenlees, P., Henry, T., Herzá?, A., Jakobsson, U., Joshi, P., Julin, R., Juutinen, S., Konki, J., Leino, M., Lotay, G., Nichols, A., Obertelli, A., . . . Wadsworth, R. (2013). Enhancing the sensitivity of recoil-beta tagging. Journal of Instrumentation, 8(4), Article P04025. DOI: 10.1088/1748-0221/8/04/P04025
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