Collectivity in A ~ 70 nuclei studied via lifetime measurements in ⁷⁰Br and ^68,70Se

A. J. Nichols^*, R. Wadsworth, H. Iwasaki, K. Kaneko, A. Lemasson, G. de Angelis, V. M. Bader, T. Baugher, D. Bazin, M. A. Bentley, J. S. Berryman, T. Braunroth, P. J. Davies, A. Dewald, C. Fransen, A. Gade, M. Hackstein, J. Henderson, D. G. Jenkins, D. MillerC. Morse, I. Paterson, E. C. Simpson, S. R. Stroberg, D. Weisshaar, K. Whitmore, K. Wimmer

^*Corresponding author for this work

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Abstract

Transition strengths for decays from low-lying states in A ~ 70 nuclei have been deduced from lifetime measurements using the recoil distance Doppler shift technique. The results confirm the collectivity previously reported for the 21+→0gs+ decay in ⁶⁸Se and reveal a relative decrease in collectivity in ⁷⁰Br. This trend is reproduced by shell model calculations using the GXPF1A interaction in an fp model space including the Coulomb, spin-orbit and isospin non-conserving interactions. The 31+→21+ decay in ⁷⁰Br is found to have a very small B(M1) value, which is consistent with the configuration of the state being dominated by the coupling of f52 protons and neutrons. The results suggest that the g92 orbit does not play an important role at low spin in these nuclei. The B(E2) values for the decays of the (T = 1) 21+ states in ⁷⁰Br and ⁷⁰Se are almost identical, suggesting there is no major shape change between the two nuclei at low spin.

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10.1016/j.physletb.2014.04.016

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Nichols, A. J., Wadsworth, R., Iwasaki, H., Kaneko, K., Lemasson, A., de Angelis, G., Bader, V. M., Baugher, T., Bazin, D., Bentley, M. A., Berryman, J. S., Braunroth, T., Davies, P. J., Dewald, A., Fransen, C., Gade, A., Hackstein, M., Henderson, J., Jenkins, D. G., ... Wimmer, K. (2014). Collectivity in A ~ 70 nuclei studied via lifetime measurements in ⁷⁰Br and ^68,70Se. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 733, 52-57. https://doi.org/10.1016/j.physletb.2014.04.016

@article{aaed167c9464481b92a5dc711ef02132,

title = "Collectivity in A ~ 70 nuclei studied via lifetime measurements in 70Br and 68,70Se",

abstract = "Transition strengths for decays from low-lying states in A ~ 70 nuclei have been deduced from lifetime measurements using the recoil distance Doppler shift technique. The results confirm the collectivity previously reported for the 21+→0gs+ decay in 68Se and reveal a relative decrease in collectivity in 70Br. This trend is reproduced by shell model calculations using the GXPF1A interaction in an fp model space including the Coulomb, spin-orbit and isospin non-conserving interactions. The 31+→21+ decay in 70Br is found to have a very small B(M1) value, which is consistent with the configuration of the state being dominated by the coupling of f52 protons and neutrons. The results suggest that the g92 orbit does not play an important role at low spin in these nuclei. The B(E2) values for the decays of the (T = 1) 21+ states in 70Br and 70Se are almost identical, suggesting there is no major shape change between the two nuclei at low spin.",

keywords = "Lifetimes, Nuclear transition probabilities, Nucleon knockout reactions",

author = "Nichols, {A. J.} and R. Wadsworth and H. Iwasaki and K. Kaneko and A. Lemasson and {de Angelis}, G. and Bader, {V. M.} and T. Baugher and D. Bazin and Bentley, {M. A.} and Berryman, {J. S.} and T. Braunroth and Davies, {P. J.} and A. Dewald and C. Fransen and A. Gade and M. Hackstein and J. Henderson and Jenkins, {D. G.} and D. Miller and C. Morse and I. Paterson and Simpson, {E. C.} and Stroberg, {S. R.} and D. Weisshaar and K. Whitmore and K. Wimmer",

year = "2014",

month = jun,

day = "2",

doi = "10.1016/j.physletb.2014.04.016",

language = "English",

volume = "733",

pages = "52--57",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

Nichols, AJ, Wadsworth, R, Iwasaki, H, Kaneko, K, Lemasson, A, de Angelis, G, Bader, VM, Baugher, T, Bazin, D, Bentley, MA, Berryman, JS, Braunroth, T, Davies, PJ, Dewald, A, Fransen, C, Gade, A, Hackstein, M, Henderson, J, Jenkins, DG, Miller, D, Morse, C, Paterson, I, Simpson, EC, Stroberg, SR, Weisshaar, D, Whitmore, K & Wimmer, K 2014, 'Collectivity in A ~ 70 nuclei studied via lifetime measurements in ⁷⁰Br and ^68,70Se', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 733, pp. 52-57. https://doi.org/10.1016/j.physletb.2014.04.016

TY - JOUR

T1 - Collectivity in A ~ 70 nuclei studied via lifetime measurements in 70Br and 68,70Se

AU - Nichols, A. J.

AU - Wadsworth, R.

AU - Iwasaki, H.

AU - Kaneko, K.

AU - Lemasson, A.

AU - de Angelis, G.

AU - Bader, V. M.

AU - Baugher, T.

AU - Bazin, D.

AU - Bentley, M. A.

AU - Berryman, J. S.

AU - Braunroth, T.

AU - Davies, P. J.

AU - Dewald, A.

AU - Fransen, C.

AU - Gade, A.

AU - Hackstein, M.

AU - Henderson, J.

AU - Jenkins, D. G.

AU - Miller, D.

AU - Morse, C.

AU - Paterson, I.

AU - Simpson, E. C.

AU - Stroberg, S. R.

AU - Weisshaar, D.

AU - Whitmore, K.

AU - Wimmer, K.

PY - 2014/6/2

Y1 - 2014/6/2

N2 - Transition strengths for decays from low-lying states in A ~ 70 nuclei have been deduced from lifetime measurements using the recoil distance Doppler shift technique. The results confirm the collectivity previously reported for the 21+→0gs+ decay in 68Se and reveal a relative decrease in collectivity in 70Br. This trend is reproduced by shell model calculations using the GXPF1A interaction in an fp model space including the Coulomb, spin-orbit and isospin non-conserving interactions. The 31+→21+ decay in 70Br is found to have a very small B(M1) value, which is consistent with the configuration of the state being dominated by the coupling of f52 protons and neutrons. The results suggest that the g92 orbit does not play an important role at low spin in these nuclei. The B(E2) values for the decays of the (T = 1) 21+ states in 70Br and 70Se are almost identical, suggesting there is no major shape change between the two nuclei at low spin.

AB - Transition strengths for decays from low-lying states in A ~ 70 nuclei have been deduced from lifetime measurements using the recoil distance Doppler shift technique. The results confirm the collectivity previously reported for the 21+→0gs+ decay in 68Se and reveal a relative decrease in collectivity in 70Br. This trend is reproduced by shell model calculations using the GXPF1A interaction in an fp model space including the Coulomb, spin-orbit and isospin non-conserving interactions. The 31+→21+ decay in 70Br is found to have a very small B(M1) value, which is consistent with the configuration of the state being dominated by the coupling of f52 protons and neutrons. The results suggest that the g92 orbit does not play an important role at low spin in these nuclei. The B(E2) values for the decays of the (T = 1) 21+ states in 70Br and 70Se are almost identical, suggesting there is no major shape change between the two nuclei at low spin.

KW - Lifetimes

KW - Nuclear transition probabilities

KW - Nucleon knockout reactions

UR - http://www.scopus.com/inward/record.url?scp=84899130703&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2014.04.016

DO - 10.1016/j.physletb.2014.04.016

M3 - Article

SN - 0370-2693

VL - 733

SP - 52

EP - 57

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -

Collectivity in A ~ 70 nuclei studied via lifetime measurements in ⁷⁰Br and ^68,70Se

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