Studies of isomeric states and limits of particle stability around N∼Z∼40 using fragmentation reactions

P. M. Regan; C. Chandler; C. J. Pearson; B. Blank; R. Grzywacz; M. Lewitowicz; A. M. Bruce; W. N. Catford; N. Curtis; S. Czajkowski; P. Dessagne; A. Fleury; W. Gelletly; J. Giovinazzo; Z. Janas; C. Longour; C. Marchand; C. Miehe; N. A. Orr; R. D. Page; M. S. Pravikoff; A. T. Reed; M. G. Saint-Laurent; S. M. Vincent; R. Wadsworth; D. D. Warner; J. S. Winfield

Studies of isomeric states and limits of particle stability around N∼Z∼40 using fragmentation reactions

P. M. Regan^*, C. Chandler, C. J. Pearson, B. Blank, R. Grzywacz, M. Lewitowicz, A. M. Bruce, W. N. Catford, N. Curtis, S. Czajkowski, P. Dessagne, A. Fleury, W. Gelletly, J. Giovinazzo, Z. Janas, C. Longour, C. Marchand, C. Miehe, N. A. Orr, R. D. PageM. S. Pravikoff, A. T. Reed, M. G. Saint-Laurent, S. M. Vincent, R. Wadsworth, D. D. Warner, J. S. Winfield

^*Corresponding author for this work

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Abstract

Fragmentation products from a ⁹²Mo beam on a natural nickel target have been used to study structural properties of the very neutron deficient nuclei around N∼Z∼40. We present the first observation of isomeric decays in the T_z=1 systems ₃₆ ⁷⁴Kr, ₃₉ ⁸⁰ Y and ₄₁ ⁸⁴Nb. The isomer in ⁷⁴Kr is interpreted as the hindered decay from an excited 0⁺ state, confirming the prediction of prolate/oblate shape coexistence in this nucleus. Transitions from states below an isomer in the N=Z nucleus ₄₃ ⁸⁶Tc have also been tentatively identified, making this the heaviest N=Z system for which decays from excited states have been observed. In addition, we have obtained the first conclusive evidence for the existence of the T_z = -1/2 isotopes ₃₉ ⁷⁷Y, ₄₀ ⁷⁹Zr and ₄₂ ⁸³Mo. The data for ₃₉ ⁷⁷Y is of particular interest in light of the reported instability in the lighter odd-Z, T_z = -1/2 systems ⁶⁹Br and ⁷³Rb.

Original language	English
Pages (from-to)	431-442
Number of pages	12
Journal	Acta Physica Polonica B
Volume	28
Issue number	1-2
Publication status	Published - 1 Dec 1997

Cite this

Regan, P. M., Chandler, C., Pearson, C. J., Blank, B., Grzywacz, R., Lewitowicz, M., Bruce, A. M., Catford, W. N., Curtis, N., Czajkowski, S., Dessagne, P., Fleury, A., Gelletly, W., Giovinazzo, J., Janas, Z., Longour, C., Marchand, C., Miehe, C., Orr, N. A., ... Winfield, J. S. (1997). Studies of isomeric states and limits of particle stability around N∼Z∼40 using fragmentation reactions. Acta Physica Polonica B, 28(1-2), 431-442.

@article{f1d75d1ace8a42b3a166478d1ebb03a9,

title = "Studies of isomeric states and limits of particle stability around N∼Z∼40 using fragmentation reactions",

abstract = "Fragmentation products from a 92Mo beam on a natural nickel target have been used to study structural properties of the very neutron deficient nuclei around N∼Z∼40. We present the first observation of isomeric decays in the Tz=1 systems 36 74Kr, 39 80 Y and 41 84Nb. The isomer in 74Kr is interpreted as the hindered decay from an excited 0+ state, confirming the prediction of prolate/oblate shape coexistence in this nucleus. Transitions from states below an isomer in the N=Z nucleus 43 86Tc have also been tentatively identified, making this the heaviest N=Z system for which decays from excited states have been observed. In addition, we have obtained the first conclusive evidence for the existence of the Tz = -1/2 isotopes 39 77Y, 40 79Zr and 42 83Mo. The data for 39 77Y is of particular interest in light of the reported instability in the lighter odd-Z, Tz = -1/2 systems 69Br and 73Rb.",

author = "Regan, {P. M.} and C. Chandler and Pearson, {C. J.} and B. Blank and R. Grzywacz and M. Lewitowicz and Bruce, {A. M.} and Catford, {W. N.} and N. Curtis and S. Czajkowski and P. Dessagne and A. Fleury and W. Gelletly and J. Giovinazzo and Z. Janas and C. Longour and C. Marchand and C. Miehe and Orr, {N. A.} and Page, {R. D.} and Pravikoff, {M. S.} and Reed, {A. T.} and Saint-Laurent, {M. G.} and Vincent, {S. M.} and R. Wadsworth and Warner, {D. D.} and Winfield, {J. S.}",

year = "1997",

month = dec,

day = "1",

language = "English",

volume = "28",

pages = "431--442",

journal = "Acta Physica Polonica B",

issn = "0587-4254",

publisher = "Jagellonian University",

number = "1-2",

}

Regan, PM, Chandler, C, Pearson, CJ, Blank, B, Grzywacz, R, Lewitowicz, M, Bruce, AM, Catford, WN, Curtis, N, Czajkowski, S, Dessagne, P, Fleury, A, Gelletly, W, Giovinazzo, J, Janas, Z, Longour, C, Marchand, C, Miehe, C, Orr, NA, Page, RD, Pravikoff, MS, Reed, AT, Saint-Laurent, MG, Vincent, SM, Wadsworth, R, Warner, DD & Winfield, JS 1997, 'Studies of isomeric states and limits of particle stability around N∼Z∼40 using fragmentation reactions', Acta Physica Polonica B, vol. 28, no. 1-2, pp. 431-442.

TY - JOUR

T1 - Studies of isomeric states and limits of particle stability around N∼Z∼40 using fragmentation reactions

AU - Regan, P. M.

AU - Chandler, C.

AU - Pearson, C. J.

AU - Blank, B.

AU - Grzywacz, R.

AU - Lewitowicz, M.

AU - Bruce, A. M.

AU - Catford, W. N.

AU - Curtis, N.

AU - Czajkowski, S.

AU - Dessagne, P.

AU - Fleury, A.

AU - Gelletly, W.

AU - Giovinazzo, J.

AU - Janas, Z.

AU - Longour, C.

AU - Marchand, C.

AU - Miehe, C.

AU - Orr, N. A.

AU - Page, R. D.

AU - Pravikoff, M. S.

AU - Reed, A. T.

AU - Saint-Laurent, M. G.

AU - Vincent, S. M.

AU - Wadsworth, R.

AU - Warner, D. D.

AU - Winfield, J. S.

PY - 1997/12/1

Y1 - 1997/12/1

N2 - Fragmentation products from a 92Mo beam on a natural nickel target have been used to study structural properties of the very neutron deficient nuclei around N∼Z∼40. We present the first observation of isomeric decays in the Tz=1 systems 36 74Kr, 39 80 Y and 41 84Nb. The isomer in 74Kr is interpreted as the hindered decay from an excited 0+ state, confirming the prediction of prolate/oblate shape coexistence in this nucleus. Transitions from states below an isomer in the N=Z nucleus 43 86Tc have also been tentatively identified, making this the heaviest N=Z system for which decays from excited states have been observed. In addition, we have obtained the first conclusive evidence for the existence of the Tz = -1/2 isotopes 39 77Y, 40 79Zr and 42 83Mo. The data for 39 77Y is of particular interest in light of the reported instability in the lighter odd-Z, Tz = -1/2 systems 69Br and 73Rb.

AB - Fragmentation products from a 92Mo beam on a natural nickel target have been used to study structural properties of the very neutron deficient nuclei around N∼Z∼40. We present the first observation of isomeric decays in the Tz=1 systems 36 74Kr, 39 80 Y and 41 84Nb. The isomer in 74Kr is interpreted as the hindered decay from an excited 0+ state, confirming the prediction of prolate/oblate shape coexistence in this nucleus. Transitions from states below an isomer in the N=Z nucleus 43 86Tc have also been tentatively identified, making this the heaviest N=Z system for which decays from excited states have been observed. In addition, we have obtained the first conclusive evidence for the existence of the Tz = -1/2 isotopes 39 77Y, 40 79Zr and 42 83Mo. The data for 39 77Y is of particular interest in light of the reported instability in the lighter odd-Z, Tz = -1/2 systems 69Br and 73Rb.

UR - http://www.scopus.com/inward/record.url?scp=0000883110&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0000883110

SN - 0587-4254

VL - 28

SP - 431

EP - 442

JO - Acta Physica Polonica B

JF - Acta Physica Polonica B

IS - 1-2

ER -

Studies of isomeric states and limits of particle stability around N∼Z∼40 using fragmentation reactions

Abstract

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