Analyzing powers of valence and inner neutron-hole states in 115Sn via the 116Sn(d, t) reaction

doi:10.1016/0375-9474(81)90118-4

Nuclear Physics A

Volume 356, Issue 1, 16 March 1981, Pages 61-73

https://doi.org/10.1016/0375-9474(81)90118-4 Get rights and content

Abstract

The reaction ¹¹⁶Sn( $d$ , t)¹¹⁵Sn up to 7.5 MeV excitation energy has been studied at 40 MeV incident energy using a vector polarized deuteron beam. The measured analyzing power reveals strong J-dependence effects and has been used to clearly assign the spin of a number of low-lying states in the ¹¹⁵Sn nucleus. At higher excitation energy, a broad and fragmented bump is observed between 3.7 and 6.0 MeV in ¹¹⁵Sn. This work reports on one of the first attempts to determine the spin of such structure through polarization measurements. The analyzing power data indicates a mixing of spins $J = 92, 12$ , in agreement with the excitation of the $1 g_{92} and 2 p_{12}$ inner neutron-hole strengths in the ¹¹⁵Sn nucleus. In addition, some $2 p_{32}$ components are observed around ~ 4.6 MeV excitation energy.

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Neutron decay of deep hole states and isobaric analog states in 115Sn populated by the (3He, α) reaction at 102 MeV
2001, Nuclear Physics A
Neutron decay of excited hole states and isobaric analog states (IAS) populated by the ¹¹⁶Sn(³He,α) reaction at an energy of 102 MeV has been investigated. The α-particles were analysed in a magnetic spectrograph positioned at 1.4° and detected with a multiwire drift chamber. Excitation energies in ¹¹⁵Sn up to 23 MeV were studied. An array of neutron detectors was positioned around the target at angles ranging from 68° to 209°. The neutron data were analysed in terms of decay into final states, using statistical model calculations as a tool to extract lower limits of nonstatistical decay. Nonstatistical decay was observed from states up to an excitation energy of about 18 MeV. The neutron emission of the IAS is compatible with 100% statistical decay.
Study of 119 Te with the (d,t) reaction
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The structure of the nucleus $^{119}$ Te has been studied with the $^{120}$ Te( $d,t)$ reaction at $E_{d} =24.0$ MeV. Almost 90 excited states have been observed up to an excitation energy of 2.5 MeV, and spin and parity values have been assigned to many of them. The existing experimental data are compared with calculations made on the basis of the Interacting Boson–Fermion Model-1. The large number of low-spin states observed up to about 1.2 MeV is well accounted for, whereas at higher energies the correspondence of calculated states with experimental ones becomes unreliable. The possibility of the occurence of `intruder' states is also discussed.
Nuclear data sheets for A = 115 *
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Nuclear Physics A

Abstract

References (15)

Nucl. Phys.

Phys. Rev.

Phys. Rev. Lett.

Nucl. Phys.

Phys. Rev.

Phys. Rev.

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Lawrence Berkeley Laboratory annual Report LBL 1666

Cited by (20)

Nuclear Data Sheets for A = 115

Nuclear Data Sheets for A = 115

Neutron decay of deep hole states and isobaric analog states in <sup>115</sup>Sn populated by the (<sup>3</sup>He, α) reaction at 102 MeV

Study of <sup>119</sup> Te with the (d,t) reaction

Nuclear data sheets for A = 115 *

Nuclear data sheets update for A = 115